Dr Mohammad Ehtisham Khan
Jazan University, Chemical Engineering, Faculty Member
- Yeungnam University, Chemical Engineering, Undergraduateadd
- Dr. Mohammad Ehtisham Khan is working as an Assistant Professor at Jazan University, Kingdom of Saudi Arabia, Previou... moreDr. Mohammad Ehtisham Khan is working as an Assistant Professor at Jazan University, Kingdom of Saudi Arabia, Previously Dr. Khan worked as a Post-doctoral Research Associate in Chemical Engineering, Yeungnam University, Republic of Korea. At present Dr. Khan is teaching several courses in the chemical engineering department and also working in the cutting edge area of nanosciences, and nanotechnology especially in the field of inorganic materials such as biogenic synthesis metal-metal oxides nanoparticles, carbon materials based on nanostructures/nanocomposites. Their applications in photocatalysis, photoelectrodes, photocurrent, antimicrobial performances. Our main area of research is the synthesis of graphene and graphene-based nanocomposites for various novel applications for energy and environmental remediation. Dr. Khan has 26 publications in international peer-reviewed journals, conference proceedings, and 6 book chapters with more than 1021 citations with 18h-index and 21-i indexes.edit
This paper reports a simple, biogenic and green approach to obtain narrow band gap and visible light-active TiO2 nanoparticles. Commercial white TiO2 (w-TiO2) was treated in the cathode chamber of a Microbial Fuel Cell (MFC), which... more
This paper reports a simple, biogenic and green approach to obtain narrow band gap and visible light-active TiO2 nanoparticles. Commercial white TiO2 (w-TiO2) was treated in the cathode chamber of a Microbial Fuel Cell (MFC), which produced modified light gray TiO2 (g-TiO2) nanoparticles. The DRS, PL, XRD, EPR, HR-TEM, and XPS were performed to understand the band gap decline of g-TiO2. The optical study revealed a significant decrease in the band gap of the g-TiO2 (E g = 2.80 eV) compared to the w-TiO2 (E g = 3.10 eV). The XPS revealed variations in the surface states, composition, Ti4+ to Ti3+ ratio, and oxygen vacancies in the g-TiO2. The Ti3+ and oxygen vacancy-induced enhanced visible light photocatalytic activity of g-TiO2 was confirmed by degrading different model dyes. The enhanced photoelectrochemical response under visible light irradiation further supported the improved performance of the g-TiO2 owing to a decrease in the electron transfer resistance and an increase in ...
Research Interests: Materials Science, Photocatalysts, Photocatalytic Oxidation, Metal Nanoparticles, Photocatalysis, and 15 morePhotocatalyst, Photocatalytic research of nanomaterials, Photocatalytic, Band Gap, Environmental Photocatalysis, Nanomaterial and photocatalysis, Irradiation, Nanomaterials for Photocatalysts, Metal Oxide Nanoparticles, Photocatalytic degradations, Band Gap Engineering, Heterogeneous photocatalysis, Photocatalytic Activities, Photocatalytic Activity, and Photocatalysis and Nanotechnology
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In this paper, we report the preparation of an SnO 2 /TiO 2 nanocomposite (SnO 2 /TiO 2 NC) for modifying a glassy carbon electrode (GCE) via a self-assembly approach; the SnO 2 /TiO 2 /GCE thus prepared was employed as a working... more
In this paper, we report the preparation of an SnO 2 /TiO 2 nanocomposite (SnO 2 /TiO 2 NC) for modifying a glassy carbon electrode (GCE) via a self-assembly approach; the SnO 2 /TiO 2 /GCE thus prepared was employed as a working electrode for the electrochemical detection of hydrazine (Hz) at room temperature. The detection of Hz as a model analyte was efficiently monitored by the dual approaches of linear sweep voltammetry and cyclic voltammetry under different optimization conditions. The SnO 2 /TiO 2 /GCE sensor showed a low limit of detection (LoD), and high sensitivity and selectivity with good linearity. The sensitivity and LoD of the proposed sensor were obtained using CV as 23.14 μA μM −1 cm −2 and 0.160 μM, respectively. A linear calibration plot was obtained (R 2 = 0.974) for varying concentrations of Hz (5 to 45 μM). However, the sensitivity and LoD using LSV were obtained as 32.92 μA μM −1 cm −2 and 0.143 μM, respectively with linear range of 1 to 40 μM (R 2 = 0.984). The present work provides a method of fabrication of an SnO 2 /TiO 2 NC-based electrochemical sensor that is effective in the detection of hazardous chemicals.
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Surface plasmonic resonance (SPR)-centered photocatalysts have helped to improve photocatalytic effectiveness for energy- and environmental-related applications, such as wastewater treatment and water splitting. The SPR phenomenon has... more
Surface plasmonic resonance (SPR)-centered photocatalysts have helped to improve photocatalytic effectiveness for energy- and environmental-related applications, such as wastewater treatment and water splitting. The SPR phenomenon has been well studied in noble metal-based nanoparticles, such as Ag and Au, to achieve an efficient photocatalytic process, particularly for wastewater treatment. SPR-based nanostructures may involve plasmon-facilitated photocatalytic reaction mechanisms, such as Schottky junctions, through electron transfer, improved limited electric fields, and plasmon resonance-based energy transference. This chapter reviews the various factors that are involved in the photodegradation of dyes. A discussion on future directions within this field of investigation is also provided.
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Schematic representation of the mechanism of charge transfer between silver nanoparticles and graphitic-carbon nitride for photocatalysis.
Research Interests: Materials Science, Sensors and Sensing, Water Treatment, Metal Nanoparticles, Photocatalysis, and 8 moreEnvironmental Photocatalysis, Preperation and Characterisation of Mixed Metal Oxides, Antibiotics, Carbon Materials, Nano Materials (Plasmonic Photocatalysts), Mixed Metal Oxides, Transition metal oxides, and nanoscale
Abstract Na,O-co-doped-graphitic- carbon nitride (Na,O-g-C3N4) was synthesized under alkaline conditions and subsequent heat treatment. The Na,O-g-C3N4 had a relatively surface area and tuned optical properties with sheet-like... more
Abstract Na,O-co-doped-graphitic- carbon nitride (Na,O-g-C3N4) was synthesized under alkaline conditions and subsequent heat treatment. The Na,O-g-C3N4 had a relatively surface area and tuned optical properties with sheet-like characteristics. A glassy carbon electrode (GCE) was modified using the Na,O-g-C3N4 (Na,O-g-C3N4/GCE) and used for the non-enzymatic detection of H2O2 (hydrogen peroxide) by electrochemical methods. The Na,O-g-C3N4/GCE was assessed for the detection of hydrogen peroxide using cyclic voltammetry and showed a low detection limit (0.05 µM) and good sensitivity (3.41 µA µM-1cm−2) with a wide linear range of 1 µM −50 µM. In addition, the use of Na,O-g-C3N4/GCE for the detection of hydrogen peroxide using LSV also showed a relatively low detection limit (0.1 µM) and high sensitivity (17.57µA µM−1 cm−2) with a wide linear range of 1 µM-45 µM. Overall, Na,O-g-C3N4 is an efficient candidate for the detection of hazardous chemicals, such as H2O2, and could be a material of great importance for other environmental-related concerns.
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Abstract Metal-free, ecofriendly, and low-cost nanostructured materials are needed for effective sensing applications. This paper reports Sulfur-doped-graphitic-carbon nitride (S-g-C3N4) as a metal-free and low-cost modifier for fluorine... more
Abstract Metal-free, ecofriendly, and low-cost nanostructured materials are needed for effective sensing applications. This paper reports Sulfur-doped-graphitic-carbon nitride (S-g-C3N4) as a metal-free and low-cost modifier for fluorine doped tin oxide (FTO) substrates (S-g-C3N4/FTO) that acts as the working electrode for the electrochemical detection of highly toxic hydrazine. Owing to the adverse effects of hydrazine on the human and environment, it can be a potential danger and require attention for the development of a sensitive method for the rapid detection of highly toxic hydrazine. The successful doping of g-C3N4 with sulfur (S) has strong influence on the performance of S-g-C3N4/FTO for the efficient detection of hydrazine over g-C3N4. The S-g-C3N4/FTO was evaluated for the detection of hydrazine using linear-sweep voltammetry (LSV) and showed a relatively low detection limit (0.06 μM) with a linear range of 60μM–475μM and good sensitivity. Cyclic voltammetry (CV) revealed showed a low detection limit (0.14 μM) with a linear range of 28μM–260μM. Overall, S-g-C3N4/FTO is a suitable material for the metal-free and low-cost detection of hydrazine and may be a robust sensing platform with great potential for other sensor developments.
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Proposed schematic model for the biogenic synthesis of Au-g-C3N4 nanostructures using an environment-friendly approach.
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Metal-graphene nanostructures (NSs) as photocatalysts, prepared using simple and scalable synthesis methods, are gaining heightened attention as novel materials for water treatment and environmental remediation applications. Graphene, the... more
Metal-graphene nanostructures (NSs) as photocatalysts, prepared using simple and scalable synthesis methods, are gaining heightened attention as novel materials for water treatment and environmental remediation applications. Graphene, the unique few layers sheet-like arrangement of sp2 hybridized carbon atoms, has an inimitable two-dimensional (2D) structure. The material is highly conductive, has high electron mobility and an extremely high surface area, and can be produced on a large scale at low cost. Accordingly, it has been considered as an essential base component for producing various metal-based NSs. In particular, metal-graphene NSs as photocatalysts have attracted considerable attention because of their special surface plasmon resonance (SPR) effect that can improve their performance for the removal of toxic dyes and other pollutants. This review summarizes the recent and advanced progress for the easy fabrication and design of graphene-based NSs as photocatalysts, as a no...
Research Interests: Technology, Photocatalysts, Graphene, Photocatalysis, Electronic Transport of Graphene, and 14 moreGraphene Devices, Physical sciences, Applications of Graphene, Environmental Photocatalysis, Nanomaterial and photocatalysis, CHEMICAL SCIENCES, Metal Oxide Nanostructures and Their Applications, Graphene synthesis, Heterogeneous photocatalysis, Visible Light Photocatalysis, Graphene Bandstructure, Graphene Nanostructures, Photocatalysis and Nanotechnology, and nanoscale
Cerium oxide nanoparticles (CeO2 NPs) were fabricated and grown on graphene sheets using a facile, low cost hydrothermal approach and subsequently characterized using different standard characterization techniques. X-ray photoelectron... more
Cerium oxide nanoparticles (CeO2 NPs) were fabricated and grown on graphene sheets using a facile, low cost hydrothermal approach and subsequently characterized using different standard characterization techniques. X-ray photoelectron spectroscopy and electron paramagnetic resonance revealed the changes in surface states, composition, changes in Ce(4+) to Ce(3+) ratio, and other defects. Transmission electron microscopy (TEM) and high resolution TEM revealed that the fabricated CeO2 NPs to be spherical with particle size of ~10-12 nm. Combination of defects in CeO2 NPs with optimal amount of two-dimensional graphene sheets had a significant effect on the properties of the resulting hybrid CeO2-Graphene nanostructures, such as improved optical, photocatalytic, and photocapacitive performance. The excellent photocatalytic degradation performances were examined by monitoring their ability to degrade Congo red ~94.5% and methylene blue dye ~98% under visible light irradiation. The photo...
Research Interests: Materials Science, Nanomaterials Characterization, Photocatalysts, Graphene, Nanomaterials, and 10 moreEnergy and Environment, Photocatalytic Oxidation, Medicine, Photocatalysis, Photocatalytic research of nanomaterials, Nanocomposite, Nanostructures, Nanomaterial and photocatalysis, Semiconductor Photocatalysis, and Visible Light Photocatalysis
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Research Interests: Engineering, Materials Science, Chemistry, Photocatalysts, Graphene, and 15 morePhotocatalytic Oxidation, Medicine, Photocatalysis, Photocatalytic research of nanomaterials, Nanocomposite, Physical sciences, CDS, Environmental Photocatalysis, Nanomaterial and photocatalysis, CHEMICAL SCIENCES, Semiconductor Photocatalysis, Photoelectrochemical and Photocatalytic Properties, Graphene Nanocomposite, Photoelectrochemical Performance, and Photoelectrochemical Studies
Visible light-induced photocatalytic degradation of organic pollutants using WO3 nanorods–graphene nanocomposite.
Research Interests: Materials Science, Nanoelectronics, Catalysis, Photocatalysts, Graphene, and 12 moreNanocomposites, Nanochemistry, Photoelectrochemistry, Photocatalysis, Applications of Graphene, RSC, Environmental Photocatalysis, Nanomaterial and photocatalysis, Graphene-Metal/metal Oxide Composites, Graphene synthesis, Visible Light Photocatalysis, and Graphene Bandstructure
Biofilm formation on the tooth surface is the root cause of dental caries and periodontal diseases. Streptococcus mutans is known to produce biofilm which is one of the primary causes of dental caries. Acid production and acid tolerance... more
Biofilm formation on the tooth surface is the root cause of dental caries and periodontal diseases. Streptococcus mutans is known to produce biofilm which is one of the primary causes of dental caries. Acid production and acid tolerance along with exopolysaccharide (EPS) formation are major virulence factors of S. mutans biofilm. In the current study, calcium fluoride nanoparticles (CaF2-NPs) were evaluated for their effect on the biofilm forming ability of S. mutans in vivo and in vitro. The in vitro studies revealed 89 % and 90 % reduction in biofilm formation and EPS production, respectively. Moreover, acid production and acid tolerance abilities of S. mutans were also reduced considerably in the presence of CaF2-NPs. Confocal laser scanning microscopy and transmission electron microscopy images were in accordance with the other results indicating inhibition of biofilm without affecting bacterial viability. The qRT-PCR gene expression analysis showed significant downregulation of...
Research Interests: Chemistry, Biofilms, Nanocomposites, Nanoparticles, Medicine, and 15 moreMultidisciplinary, Photocatalysis, Animals, Graphene polymer composites, Dental Caries, Applications of Graphene, Photoelectrochemical Cell, Calcium Fluoride, Rats, Graphene synthesis, Streptococcus mutans, Graphene Bandstructure, Microbial Viability, Gene expression profiling, and real time polymerase chain reaction
Visible light-induced photocatalytic degradation of pollutants using an Au–Graphene nanocomposite.
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ABSTRACT A simplistic and environment friendly approach using electrochemically active biofilm (EAB) has been successfully developed for the synthesis of an Au@Graphene (Au@G) nanocomposite. The as-prepared nanocomposite was analyzed and... more
ABSTRACT A simplistic and environment friendly approach using electrochemically active biofilm (EAB) has been successfully developed for the synthesis of an Au@Graphene (Au@G) nanocomposite. The as-prepared nanocomposite was analyzed and characterized by X-ray diffractometer, diffuse reflectance spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and Transmission electron microscopy. In this work the anchoring of gold nanoparticles on graphene sheet was achieved which prevents the aggregation of graphene sheets and keep them apart because of decrease in the attractive forces between the graphene layers. The photocatalytic and photocurrent performance of Au@G nanocomposite was evaluated by photodegradation of Methylene Blue (MB) in aqueous solution at ambient temperature under visible-light irradiation and linear scan voltammetry, respectively. The results confirmed that the Au@G nanocomposite exhibited much better photocatalytic and photoelectrochemical performance than the pure graphene owing to the anchoring of gold nanoparticles that holds great promise for developing photoelectrochemical devices. In addition, the Au@G nanocomposite could be promisingly applied in several other fields.
Visible light-induced photocatalytic degradation of colored dyes using Au–SnO2 nanocomposite.
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Narrow band gap zinc oxide (ZnO) nanoparticles (NPs) were synthesized using unboiled and boiled leaf extracts of Costus woodsonii. The as-synthesized NPs were characterized using a range of techniques. The as-synthesized ZnO NPs were... more
Narrow band gap zinc oxide (ZnO) nanoparticles (NPs) were synthesized using unboiled and boiled leaf extracts of Costus woodsonii. The as-synthesized NPs were characterized using a range of techniques. The as-synthesized ZnO NPs were crystalline with a hexagonal wurtzite structure similar to the commercial ZnO (ZnO-C). The maximum absorbance was observed at ~390 nm for ZnO-C and the as-synthesized ZnO NPs (ZnO-UL and ZnOBL) showed a red shift, i.e. ~448 nm to ~462 nm, hence, a lower band gap of ~2.68–2.77 eV. The band gap energy of the as-synthesized ZnO NPs was lower than that of commercial ZnO. The surface of ZnO was coated/modified with the components of the leaf extract. The as-synthesized ZnO NPs showed similar particle sizes and were spherical in shape. These studies confirmed the green synthesis of ZnO NPs using Costus woodsonii and the significantly reduced band gap (Eg =~2.68 eV to ~2.77 eV) of the as-synthesized ZnO NPs compared to the ZnO-C (Eg =3.18 eV).
Research Interests: Materials Engineering, Green Synthesis of nanoparticles, ZnO nanorods, ZnO (Zinc Oxide), ZnO nanostructure, and 8 more Solvent free synthesis (Green Chemistry), Green Synthesis, Nano Zno, Zno Nanoparticles, Green Synthesis of Zno Nanoparticles, narrow band gap ZnO, Band gap engineered ZnO, and Band gap narrowed ZnO
Noble-metal silver (Ag) nanoparticles (NPs) anchored/decorated onto polymeric graphitic carbon nitride (g-C3N4) as nanostructures (NSs) were prepared using modest and environment-friendly synthesis method with a developed-single-strain... more
Noble-metal silver (Ag) nanoparticles (NPs) anchored/decorated onto polymeric graphitic carbon nitride (g-C3N4) as nanostructures (NSs) were prepared using modest and environment-friendly synthesis method with a developed-single-strain biofilm as a reducing implement. The as-fabricated NSs were characterized using standard characterization techniques. The nanosized and uniform AgNPs were well deposited onto the sheet-like matrix of g-C3N4 and exhibited good antimicrobial activity and superior photodegradation of dyes methylene blue (MB) and rhodamine B (RhB) dyes under visible-light illumination. The Ag@g-C3N4 NSs exhibited active and effective bactericidal performance and a survival test in counter to Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa. The as-fabricated NSs also exhibited superior visible-light photodegradation of MB and RhB in much less time as compared to other reports. Ag@g-C3N4 NSs (3 mM) showed superior photocatalytic measurements under visible-light irradiation: ∼100% MB degradation and ∼89% of RhB degradation in 210 and 250 min, respectively. The obtained results indicate that the AgNPs were well deposited onto the g-C3N4 structure, which decreases the charge recombination rate of photogenerated electrons and holes and extends the performance of pure g-C3N4 under visible light. In conclusion, the as-fabricated Ag@g-C3N4 NSs are keen nanostructured materials that can be applied as antimicrobial materials and visible-light-induced photocatalysts.
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Cancer is known to be a foremost cause of mortality worldwide. Available treatments (radiation, hormone, chemotherapy, and immunotherapy) being non-specific and unable to cross biological barriers, have restricted their use producing in... more
Cancer is known to be a foremost cause of mortality worldwide. Available treatments (radiation, hormone, chemotherapy, and immunotherapy) being non-specific and unable to cross biological barriers, have restricted their use producing in humans. With greater side effects, there is a change in trend towards exploration of nano-technological approaches to achieve site specific delivery of drugs. Nanoparticles being unique on nanometer-scale size and large surface to volume ratio, are highly efficient in the delivery of potent drugs to specific tumor sites. This article reviewed different approaches of cancer therapy, current statistics and importance of nanoparticles in cancer therapy and highlighted different types of nanomaterials and nanomedicines used for cancer imaging and treatment, including their applications and limitations. Furthermore we discussed nanoparticle based formulations, which are currently in clinical trials and/or previously approved by FDA. This review will provi...
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Visible light-driven photocatalytic degradation of organic pollutants using the Ag–graphene nanocomposite.
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Development of advanced materials with a benign environmentally friendly approach for heterogeneous visible light photocatalysis is always preferable. An environmentally favorable approach was used to anchor silver nanoparticles (Ag NPs)... more
Development of advanced materials with a benign environmentally friendly approach for heterogeneous visible light photocatalysis is always preferable. An environmentally favorable approach was used to anchor silver nanoparticles (Ag NPs) to tin oxide-decorated-graphitic carbon nitride (SnO2-g-C3N4) using a biofilm as a green reducing tool for the biogenic synthesis of 1–6 mM Ag@SnO2-g-C3N4 nanostructures (NSs). The fabricated NSs were characterized using sophisticated techniques. The developed Ag@SnO2-g-C3N4 NSs showed a well-defined spherical-shaped Ag NPs anchored to SnO2-g-C3N4 NSs. The synthesized NSs were applied for photocatalytic degradation of hazardous dyes and photoelectrochemical studies. A comparative investigation of Ag@SnO2-g-C3N4 NSs for the visible light-assisted photocatalytic degradation of Methylene blue (MB), Congo red (CR), and Rhodamine B (RhB) was performed. The photocatalytic degradation of MB, CR, and RhB reached ∼99% in 90 min, ∼98% in 60 min, and ∼94% in 240 min, respectively. The anchoring of Ag NPs to SnO2-g-C3N4 NSs further enhanced the visible light photocatalytic degradation of the dyes due to surface plasmon resonance and by lowering the recombination of the photogenerated electrons and holes. Further, high electron transfer ability of Ag@SnO2-g-C3N4 NSs was investigated by electrochemical impedance spectroscopy to understand the mechanistic insights of the excellent activity under visible light irradiation. Hence, the present study provides an environmentally benign approach for the synthesis and excellent visible light effective photocatalysis and photoelectrochemical performance.
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ABSTRACT Speaker-specific characteristics play an important role on the performance of Bangla (widely used as Bengali) automatic speech recognition (ASR). Gender factor shows adverse effect in the classifier while recognizing a speech by... more
ABSTRACT Speaker-specific characteristics play an important role on the performance of Bangla (widely used as Bengali) automatic speech recognition (ASR). Gender factor shows adverse effect in the classifier while recognizing a speech by an opposite gender, such as, training a classifier by male but testing is done by female or vice-versa. To obtain a robust ASR system in practice it is necessary to invent a system that incorporates gender independent effect for particular gender. In this paper, we have proposed a Gender-Independent technique for ASR that focused on a gender factor. The proposed method trains the classifier with the both types of gender, male and female, and evaluates the classifier for the male and female. For the experiments, we have designed a medium size Bangla (widely known as Bengali) speech corpus for both the male and female. The proposed system has showed a significant improvement of word correct rates, word accuracies and sentence correct rates in comparison with the method that suffers from gender effects. Moreover, it requires a fewer mixture component in hidden Markov model (HMMs) and hence, computation time.
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In this paper, we report the preparation of an SnO 2 /TiO 2 nanocomposite (SnO 2 /TiO 2 NC) for modifying a glassy carbon electrode (GCE) via a self-assembly approach; the SnO 2 /TiO 2 /GCE thus prepared was employed as a working... more
In this paper, we report the preparation of an SnO 2 /TiO 2 nanocomposite (SnO 2 /TiO 2 NC) for modifying a glassy carbon electrode (GCE) via a self-assembly approach; the SnO 2 /TiO 2 /GCE thus prepared was employed as a working electrode for the electrochemical detection of hydrazine (Hz) at room temperature. The detection of Hz as a model analyte was efficiently monitored by the dual approaches of linear sweep voltammetry and cyclic voltammetry under different optimization conditions. The SnO 2 /TiO 2 /GCE sensor showed a low limit of detection (LoD), and high sensitivity and selectivity with good linearity. The sensitivity and LoD of the proposed sensor were obtained using CV as 23.14 μA μM −1 cm −2 and 0.160 μM, respectively. A linear calibration plot was obtained (R 2 = 0.974) for varying concentrations of Hz (5 to 45 μM). However, the sensitivity and LoD using LSV were obtained as 32.92 μA μM −1 cm −2 and 0.143 μM, respectively with linear range of 1 to 40 μM (R 2 = 0.984). The present work provides a method of fabrication of an SnO 2 /TiO 2 NC-based electrochemical sensor that is effective in the detection of hazardous chemicals.
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The rapid progress of state-of-the-art carbon-based metals as a catalyst is playing a central role in the research area of chemical and materials engineering for effective visible-light-induced catalytic applications. Numerous admirable... more
The rapid progress of state-of-the-art carbon-based metals as a catalyst is playing a central role in the research area of chemical and materials engineering for effective visible-light-induced catalytic applications. Numerous admirable catalysts have been fabricated, but significant challenges persist to lower the cost and increase the action of catalysts. The development of carbon-based nanostructured materials (i.e., activated carbon, carbon nitride, graphite, fullerenes, carbon nanotubes, diamond, graphene, etc.) represents an admirable substitute to out-of-date catalysts. Significant efforts have been made by researchers toward the improvement of various carbon-based metal nanostructures as catalysts. Moreover, incredible development has been achieved in several fields of catalysis, such as visible-light-induced catalysis, electrochemical performance, energy storage, and conversion, etc. This review gives an overview of the up-to-date developments in the strategy of design and fabrication of carbon-based metal nanostructures as photo-catalysts by means of several methods within the green approach, including chemical synthesis, in situ growth, solution mixing, and hydrothermal approaches. Moreover, the photocatalytic effects of the resulting carbon-based nanostructure classifications are similarly deliberated relative to their eco-friendly applications, such as photocatalytic degradation of organic dye pollutants.
Research Interests: Sensors and Sensing, Water Treatment, Metal Nanoparticles, Transition-Metal Oxides, Photocatalysis, and 7 moreEnvironmental Photocatalysis, Preperation and Characterisation of Mixed Metal Oxides, Antibiotics, Carbon Materials, Nano Materials (Plasmonic Photocatalysts), Development of Modified N Doped TiO2 Photocatalyst With Metals, Nonmetals and Metal Oxides, and Mixed Metal Oxides
Visible light-active TiO 2 (m-TiO 2) nanoparticles were obtained by an electron beam treatment of commercial TiO 2 (p-TiO 2) nanoparticles. The m-TiO 2 nanoparticles exhibited a distinct red-shift in the UV-visible absorption spectrum and... more
Visible light-active TiO 2 (m-TiO 2) nanoparticles were obtained by an electron beam treatment of commercial TiO 2 (p-TiO 2) nanoparticles. The m-TiO 2 nanoparticles exhibited a distinct red-shift in the UV-visible absorption spectrum and a much narrower band gap (2.85 eV) due to defects as confirmed by diffuse reflectance spectroscopy (DRS), photoluminescence (PL), X-ray diffraction, Raman spectroscopy, electron paramagnetic resonance, transmission electron microscopy, X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS) and linear scan voltammetry (LSV). The XPS revealed changes in the surface states, composition, Ti 4+ to Ti 3+ ratio, and oxygen deficiencies in the m-TiO 2. The valence band XPS, DRS and PL results were carefully examined to understand the band gap reduction of m-TiO 2. The visible light-responsive enhanced photocatalytic activity of m-TiO 2 was demonstrated by degrading methylene blue and brilliant blue G. The EIS and LSV in the dark and under visible light irradiation further support the visible light-induced photocatalytic activities of the m-TiO 2 due to a decrease in electron transfer resistance and an increase in photocurrent. This study confirms that m-TiO 2 can be used effectively as a photocatalyst and photoelectrode material owing to its enhanced visible light-induced photocatalytic activity.