The aim of this study was to explore the phytochemical composition, heavy metals analysis and the... more The aim of this study was to explore the phytochemical composition, heavy metals analysis and the antibacterial activity of six medicinal plants i.e., Terminalia chebula Retz (fruits), Aegle marmelos L., (fruits), Curcuma longa L., (rhizomes), Syzygium aromaticum L., (flower buds), Piper nigrum L., (seeds), Cinnamomum cassia L., (barks) and its two remedial recipes (recipe 1 and 2) used against diarrhea obtained from the local herbal practitioners (Hakeems). A preliminary phytochemical screening of the above-mentioned plants extract in methanol, chloroform, n-hexane and distilled water revealed the presence of various constituents such as alkaloids, flavonoids, tannins and saponins by using standard procedures. The quantitative phytochemical studies shows that alkaloids, flavonoid and saponins were in maximum amount in Terminalia chebula. The concentration of Cd, Ni, Pb, Fe, Cr, Cu and Zn were investigated by using an atomic absorption spectrometer. The obtained analysis shows that ...
The removal of toxic metals like lead (Pb) and cadmium (Cd) is very urgent keeping their hazardou... more The removal of toxic metals like lead (Pb) and cadmium (Cd) is very urgent keeping their hazardous effects in view. In this work, seeds of Albizia lebbeck and Melia azedarach trees were converted into activated carbon adsorbents and applied for the adsorptive removal of Pb and Cd metals from an aqueous solution. The as prepared adsorbents were characterised by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The removal efficiencies of both metals were strongly dependent on their initial concentration, contact time, pH, temperature and the quantity of adsorbents. 0.2 g of both adsorbents removed respectively 75 and 62% Pb and 77 and 66% Cd from from 100 ml of a 40 mg/l concentrated solution in 120 min at pH 5 and a temperature of 20°C. Both the Freundlich and Langmuir isotherms were well fitted to the experimental data. We believe that this work will provide a convenient way to synthesise low cost activated carbon adsorbents for the remediation ...
In this study, activated carbon derived from Monotheca buxifolia waste seeds was used for the ads... more In this study, activated carbon derived from Monotheca buxifolia waste seeds was used for the adsorptive removal of a number of selected azo dyes such as Eriochrome Black T (EBT), Remazol brilliant blue (RBB), Remazol yellow (RY) and Remazol brilliant orange (RBO) from an aqueous solution by changing the initial dye concentration, adsorbent dosage, solution pH, contact time and temperature. A Fourier transform infrared spectroscopic analysis of the activated carbon showed the existence of hydroxyls, methyl, methylene, carbonyls, alkane and alkenes groups while the scanning electron microscopic image displayed the gradual formation of cavities and open pores on the surface. The results showed that as the amount of the adsorbent and the shaking time were increased, the removal percentage of the dye increased accordingly. Higher adsorption percentages were observed at a lower dye concentration and temperature in an acidic media at a pH range (1–5). The investigated data were evaluated ...
The quest for advanced gas sensing materials to detect toxic gases at low temperatures has recent... more The quest for advanced gas sensing materials to detect toxic gases at low temperatures has recently received much attention to ensure indoor and outdoor air quality. For this purpose, two-dimension...
Abstract In this study, the hydrothermal and Chemical Vapor Deposition (CVD) methods were applied... more Abstract In this study, the hydrothermal and Chemical Vapor Deposition (CVD) methods were applied to synthesize the Ni9S8/NiAl2O4 (NAS) nanocomposites by in situ using NiAl-LDH (NA) as a template. A series of structural and morphological features show that the NAS 2-1 nanocomposite (NC) with the three-dimensional (3D) flower-like structure which is composed of ultrathin nanosheets (4.1–4.9 nm) and porosity (about 2 nm). The NAS 2-1 (NA:S mass ratio 1:6) NC sensor exhibited the excellent response (20.30) with ultrafast response time (1.06 s) to 100 ppm NOx at room temperature (RT), and the detection limit can reach to 10 ppb, respectively. The superior gas sensitivity of the NAS 2-1 sensor is primarily due to the particular three-dimensional flower-like nanostructures and the synergy between Ni9S8 and NiAl2O4. The NAS 2-1 sensor is expected to be used as a gas sensing material due to its excellent three-dimensional flower-like structure and outstanding properties at RT.
Abstract Intercalated γ-Bi2MoO6/graphene nanosheet composites (BMO/GNCs) were prepared by vacuum-... more Abstract Intercalated γ-Bi2MoO6/graphene nanosheet composites (BMO/GNCs) were prepared by vacuum-assistant and solvothermal technique. In BMO/GNCs, BMO nanoparticles (NPs) were uniformly distributed on the surface and interlayer of graphene nanosheets (GNs), simultaneously along with a large number of defects and interface on GNs and BMO NPs. As synthesized with solvothermal temperature at 160 °C and graphite content of 80 mg, BMO/GNCs-8-160 sample exhibits the remarkable gas sensitivity, reversibility and selectivity to NO2 at room temperature (RT, 22 °C). The relative response rate of the sensor toward 100 ppm NO2 is 96.73, which is about 6.41 times of pure BMO NPs. Furthermore, the response time and recovery time is merely 2.5 and 34.1 s, respectively. The detection limit can reach 10 ppb with response value of 1.51. The improved NO2 sensing performance is attributed to the effective electron transfer between BMO NPs and GNs and typical structure characteristics of BMO/GNCs, which is rarely reported in the room temperature type of Bi2MoO6 sensor.
We have synthesized 3D flower-like CoAl-LDHs consisting of ultrathin nanosheets for excellent per... more We have synthesized 3D flower-like CoAl-LDHs consisting of ultrathin nanosheets for excellent performance for NO2 detection at room temperature.
Mesoporous palladium oxide (PdO)-functionalized tin dioxide (SnO) composite nanotubes (SPCTs) wer... more Mesoporous palladium oxide (PdO)-functionalized tin dioxide (SnO) composite nanotubes (SPCTs) were prepared via one-step synthesis by electrospinning technology using ethanol and N,N-dimethylformamide (DMF) as solvents. Compared with pure SnO nanotubes, there were abundant mesopores and multiheterojunctions in PdO-functionalized SnO nanotubes. The sample with the molar ratio of SnO:PdO of 100:3 (3-SPCT) exhibited excellent response (∼20.30) as a sensor with fast gas response speed (∼1.33 s) to 100 ppm nitrogen dioxide (NO) at room temperature (RT), and the detection limit reached to 10 ppb. The improved gas sensing performance of the 3-SPCT sensor was mainly attributed to the synergistic effect: the unique SnO tubular structure and well-dispersed mesopores provided the gas diffusion and adsorption channels, oxygen defects and chemisorbed oxygen were taken as the electron trap and charge transfer active sites, and a large number of heterojunctions acted as electron transport channels, thereby increasing the transfer rate.
Two dimensional (2D) transition metal dichalcogenides (TMDs) have by far stimulated growing resea... more Two dimensional (2D) transition metal dichalcogenides (TMDs) have by far stimulated growing research interest in the field of gas sensing due to high surface to volume ratio, tunable layers depended...
The aim of this study was to explore the phytochemical composition, heavy metals analysis and the... more The aim of this study was to explore the phytochemical composition, heavy metals analysis and the antibacterial activity of six medicinal plants i.e., Terminalia chebula Retz (fruits), Aegle marmelos L., (fruits), Curcuma longa L., (rhizomes), Syzygium aromaticum L., (flower buds), Piper nigrum L., (seeds), Cinnamomum cassia L., (barks) and its two remedial recipes (recipe 1 and 2) used against diarrhea obtained from the local herbal practitioners (Hakeems). A preliminary phytochemical screening of the above-mentioned plants extract in methanol, chloroform, n-hexane and distilled water revealed the presence of various constituents such as alkaloids, flavonoids, tannins and saponins by using standard procedures. The quantitative phytochemical studies shows that alkaloids, flavonoid and saponins were in maximum amount in Terminalia chebula. The concentration of Cd, Ni, Pb, Fe, Cr, Cu and Zn were investigated by using an atomic absorption spectrometer. The obtained analysis shows that ...
The removal of toxic metals like lead (Pb) and cadmium (Cd) is very urgent keeping their hazardou... more The removal of toxic metals like lead (Pb) and cadmium (Cd) is very urgent keeping their hazardous effects in view. In this work, seeds of Albizia lebbeck and Melia azedarach trees were converted into activated carbon adsorbents and applied for the adsorptive removal of Pb and Cd metals from an aqueous solution. The as prepared adsorbents were characterised by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The removal efficiencies of both metals were strongly dependent on their initial concentration, contact time, pH, temperature and the quantity of adsorbents. 0.2 g of both adsorbents removed respectively 75 and 62% Pb and 77 and 66% Cd from from 100 ml of a 40 mg/l concentrated solution in 120 min at pH 5 and a temperature of 20°C. Both the Freundlich and Langmuir isotherms were well fitted to the experimental data. We believe that this work will provide a convenient way to synthesise low cost activated carbon adsorbents for the remediation ...
In this study, activated carbon derived from Monotheca buxifolia waste seeds was used for the ads... more In this study, activated carbon derived from Monotheca buxifolia waste seeds was used for the adsorptive removal of a number of selected azo dyes such as Eriochrome Black T (EBT), Remazol brilliant blue (RBB), Remazol yellow (RY) and Remazol brilliant orange (RBO) from an aqueous solution by changing the initial dye concentration, adsorbent dosage, solution pH, contact time and temperature. A Fourier transform infrared spectroscopic analysis of the activated carbon showed the existence of hydroxyls, methyl, methylene, carbonyls, alkane and alkenes groups while the scanning electron microscopic image displayed the gradual formation of cavities and open pores on the surface. The results showed that as the amount of the adsorbent and the shaking time were increased, the removal percentage of the dye increased accordingly. Higher adsorption percentages were observed at a lower dye concentration and temperature in an acidic media at a pH range (1–5). The investigated data were evaluated ...
The quest for advanced gas sensing materials to detect toxic gases at low temperatures has recent... more The quest for advanced gas sensing materials to detect toxic gases at low temperatures has recently received much attention to ensure indoor and outdoor air quality. For this purpose, two-dimension...
Abstract In this study, the hydrothermal and Chemical Vapor Deposition (CVD) methods were applied... more Abstract In this study, the hydrothermal and Chemical Vapor Deposition (CVD) methods were applied to synthesize the Ni9S8/NiAl2O4 (NAS) nanocomposites by in situ using NiAl-LDH (NA) as a template. A series of structural and morphological features show that the NAS 2-1 nanocomposite (NC) with the three-dimensional (3D) flower-like structure which is composed of ultrathin nanosheets (4.1–4.9 nm) and porosity (about 2 nm). The NAS 2-1 (NA:S mass ratio 1:6) NC sensor exhibited the excellent response (20.30) with ultrafast response time (1.06 s) to 100 ppm NOx at room temperature (RT), and the detection limit can reach to 10 ppb, respectively. The superior gas sensitivity of the NAS 2-1 sensor is primarily due to the particular three-dimensional flower-like nanostructures and the synergy between Ni9S8 and NiAl2O4. The NAS 2-1 sensor is expected to be used as a gas sensing material due to its excellent three-dimensional flower-like structure and outstanding properties at RT.
Abstract Intercalated γ-Bi2MoO6/graphene nanosheet composites (BMO/GNCs) were prepared by vacuum-... more Abstract Intercalated γ-Bi2MoO6/graphene nanosheet composites (BMO/GNCs) were prepared by vacuum-assistant and solvothermal technique. In BMO/GNCs, BMO nanoparticles (NPs) were uniformly distributed on the surface and interlayer of graphene nanosheets (GNs), simultaneously along with a large number of defects and interface on GNs and BMO NPs. As synthesized with solvothermal temperature at 160 °C and graphite content of 80 mg, BMO/GNCs-8-160 sample exhibits the remarkable gas sensitivity, reversibility and selectivity to NO2 at room temperature (RT, 22 °C). The relative response rate of the sensor toward 100 ppm NO2 is 96.73, which is about 6.41 times of pure BMO NPs. Furthermore, the response time and recovery time is merely 2.5 and 34.1 s, respectively. The detection limit can reach 10 ppb with response value of 1.51. The improved NO2 sensing performance is attributed to the effective electron transfer between BMO NPs and GNs and typical structure characteristics of BMO/GNCs, which is rarely reported in the room temperature type of Bi2MoO6 sensor.
We have synthesized 3D flower-like CoAl-LDHs consisting of ultrathin nanosheets for excellent per... more We have synthesized 3D flower-like CoAl-LDHs consisting of ultrathin nanosheets for excellent performance for NO2 detection at room temperature.
Mesoporous palladium oxide (PdO)-functionalized tin dioxide (SnO) composite nanotubes (SPCTs) wer... more Mesoporous palladium oxide (PdO)-functionalized tin dioxide (SnO) composite nanotubes (SPCTs) were prepared via one-step synthesis by electrospinning technology using ethanol and N,N-dimethylformamide (DMF) as solvents. Compared with pure SnO nanotubes, there were abundant mesopores and multiheterojunctions in PdO-functionalized SnO nanotubes. The sample with the molar ratio of SnO:PdO of 100:3 (3-SPCT) exhibited excellent response (∼20.30) as a sensor with fast gas response speed (∼1.33 s) to 100 ppm nitrogen dioxide (NO) at room temperature (RT), and the detection limit reached to 10 ppb. The improved gas sensing performance of the 3-SPCT sensor was mainly attributed to the synergistic effect: the unique SnO tubular structure and well-dispersed mesopores provided the gas diffusion and adsorption channels, oxygen defects and chemisorbed oxygen were taken as the electron trap and charge transfer active sites, and a large number of heterojunctions acted as electron transport channels, thereby increasing the transfer rate.
Two dimensional (2D) transition metal dichalcogenides (TMDs) have by far stimulated growing resea... more Two dimensional (2D) transition metal dichalcogenides (TMDs) have by far stimulated growing research interest in the field of gas sensing due to high surface to volume ratio, tunable layers depended...
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Papers by Mohib Ullah