Journal of Radioanalytical and Nuclear Chemistry, Jul 26, 2015
A solid phase extraction method for separation and enrichment of uranium(VI) was developed using ... more A solid phase extraction method for separation and enrichment of uranium(VI) was developed using Penicillium chrysogenum immobilized on silica mixed with double distilled water. Conditions such as pH, sample flow rate and volume, eluting solution and interfering ions with uranium(VI) optimized and determined spectrophotometrically for quantitative sorbtion. Maximum adsorption found at monolayer was 1.3004 mg/g using Langmuir isotherm. The limits of detection (LOD) and limit of quantification (LOQ) of the proposed method for uranium(VI) was 0.61 μg/L and was 2.02 μg/L respectively. The method developed for the separation and recovery of uranium(VI) was applied sediment samples and tap water samples.
Biomass have significant impact on the development of new solid phase extraction methods for meta... more Biomass have significant impact on the development of new solid phase extraction methods for metal analysis. Adsorbent was prepared by incorporating dried biomass ( Aspergillus oryzae) immobilized on activated silica was presently developed for Au(III) enrichment. The main factors affecting the adsorption-desorption condition sample solution pH, sample volume, eluent and eluent flow rate were optimized. Under the optimum conditions, good recovery was obtained at about 99.4 ± 0.1 % performed by Flame Atomic Absorption Spectrometry. At optimized pH 2.0 were Au(III) quantitatively sorbed and was recovered with 1:1 mixture of 0.2 M HCl mixed with 0.2 M thiourea. The enrichment factor were found as 125, and the limit of detection were 0.88 μg L -1 whereas limit of quantification is 2.93 μg L -1 . The proposed method was successfully applied in the analysis of tap water, pharmaceutical formulated product and synthetically prepared dummy sample. Equilibrium data also were fitted by linear ...
Selenium nanoparticles (SeNPs) have attracted great attention because of their superior optical p... more Selenium nanoparticles (SeNPs) have attracted great attention because of their superior optical properties and wide utilization in biological and biomedical studies.
In this article, we report a facile strategy for the synthesis of G@SiO2‐AR by using silica nanop... more In this article, we report a facile strategy for the synthesis of G@SiO2‐AR by using silica nanoparticles, which are coated with graphene and alkyd resin. During the synthesis of G@SiO2‐AR, the silica particles have been prepared in situ by hydrolysis of tetraethyl ortho silicate (TEOS). The G@SiO2‐AR has been employed to remove the methylene blue (MB) from aqueous solution. G@SiO2‐AR has a strong affinity to adsorb MB as MB is a cationic dye and it is strongly attracted by anions induced by deprotonation of acid functionality on GO. The detailed adsorption characteristics of G@SiO2‐AR, such as adsorption kinetic and adsorption isotherm has been investigated. The efficiency of dye adsorption on a G@SiO2‐AR has been investigated under various parameters such as contact time, temperature, and pH. The adsorption experiment has been carried out by keeping the constant adsorbent dose in 50 mL of 50 ppm dye solution with varying time intervals such as 5, 10, 15, 20 and 25 min at room temp...
In this study, we focus on the biomimetic development of small molecules and their biological sen... more In this study, we focus on the biomimetic development of small molecules and their biological sensing with DNA.
Abstract Water easily gets contaminated with various contaminants such as dyes, toxic/nontoxic me... more Abstract Water easily gets contaminated with various contaminants such as dyes, toxic/nontoxic metals, and pesticides. A microbial-mediated remediation and separation is an important tool for the removal of hazardous constituents in water. Microbial application in remediation exhibits numerous benefits such as easy availability, green chemistry approach, and being economically viable. This chapter deals with different types of cyanobacteria used for the remediation of polluted water with dyes, pesticides along with separation of toxic/nontoxic metals, the methods applied for dye and pesticide remediation, separation/characterization/identification of separated metals, and analytical tools utilized for calculating the amount of metals separated. Being ubiquitous, cyanobacteria typify as a photosynthetic (autotrophic), N2 fixer, unicellular, and microscale sized, exhibiting rapid reproduction rate. Cyanobacterial species can grow in highly polluted aquatic systems, including synthetic dyes, toxic metals, and also in nutrient-limiting conditions as well as the extreme ecological environment. Cyanobacteria cope with pollutants in different ways such as biotransformation, bioaccumulation, or biosorption of biodegradable or nonbiodegradable pollutants (pesticides, dyes) or toxic metals. Hence, cyanobacterial species are catching attention as a reliable candidate for the remediation and separation of hazardous water contaminants.
Bioinorganic chemistry has achieved great importance by considering environmental and health issu... more Bioinorganic chemistry has achieved great importance by considering environmental and health issues. Here we present anticancer, antioxidant, good protein quencher single pot biosynthesized one dimensional palladium Nanoneedles (PdNNs) as a negative catalyst, where water plays a role of safer solvent. Needle-shaped one-dimensional PdNNs was synthesized using filamentous fungal stain of Aspergillus oryzae (biomass) was successively applied as a suppressant for the growth of human breast, colon and leukemia cancer Cell Lines. Quenching process of bovine serum albumin by PdNNs was spontaneous with hydrogen bonding and hydrophilic interaction. Interaction of protein and PdNNs showed binding constant in the range of 104 M-1 and one binding site. Forster's resonance energy transfer (FRET) theory applied to find out distance between the interaction of PdNNs and protein, where critical distance and energy transfer distance varies with change in concentrations of PdNNs 4.84 x 10−6 M to 9...
Chitosan biological macromolecule is a versatile polymer; chemical modification has been carried ... more Chitosan biological macromolecule is a versatile polymer; chemical modification has been carried out that lead to the formation of chitosan grafted polymers composites (Chito-g-PC). We proposed synthesis of six various Chito-g-PC as sorbents for toxic dyes. A novel graft copolymerization method based on radical polymerization with vinyl monomer like acrylic acid, acrylamide, N-isopropylacrylamide, methacrylic acid and polyacrylonitrile were utilized in order to address the large amount of swelling at four different pH buffers solution. The effect of initiator and monomer concentration, time and temperature on % grafting and % grafting efficiency were performed. Comparative characterization of Chito and Chito-g-PC were evaluated by SEM, XRD and FTIR, as well as solubility characteristics of the composites were determined by various pH buffer solution. Cationic toxic dyes Malachite green (MG) and Methylene blue (MB) were selected as the sorbet, and Chito-g-PC were used as biosorbents....
Journal of Radioanalytical and Nuclear Chemistry, 2015
A solid phase extraction method for separation and enrichment of uranium(VI) was developed using ... more A solid phase extraction method for separation and enrichment of uranium(VI) was developed using Penicillium chrysogenum immobilized on silica mixed with double distilled water. Conditions such as pH, sample flow rate and volume, eluting solution and interfering ions with uranium(VI) optimized and determined spectrophotometrically for quantitative sorbtion. Maximum adsorption found at monolayer was 1.3004 mg/g using Langmuir isotherm. The limits of detection (LOD) and limit of quantification (LOQ) of the proposed method for uranium(VI) was 0.61 μg/L and was 2.02 μg/L respectively. The method developed for the separation and recovery of uranium(VI) was applied sediment samples and tap water samples.
Journal of Radioanalytical and Nuclear Chemistry, Jul 26, 2015
A solid phase extraction method for separation and enrichment of uranium(VI) was developed using ... more A solid phase extraction method for separation and enrichment of uranium(VI) was developed using Penicillium chrysogenum immobilized on silica mixed with double distilled water. Conditions such as pH, sample flow rate and volume, eluting solution and interfering ions with uranium(VI) optimized and determined spectrophotometrically for quantitative sorbtion. Maximum adsorption found at monolayer was 1.3004 mg/g using Langmuir isotherm. The limits of detection (LOD) and limit of quantification (LOQ) of the proposed method for uranium(VI) was 0.61 μg/L and was 2.02 μg/L respectively. The method developed for the separation and recovery of uranium(VI) was applied sediment samples and tap water samples.
Biomass have significant impact on the development of new solid phase extraction methods for meta... more Biomass have significant impact on the development of new solid phase extraction methods for metal analysis. Adsorbent was prepared by incorporating dried biomass ( Aspergillus oryzae) immobilized on activated silica was presently developed for Au(III) enrichment. The main factors affecting the adsorption-desorption condition sample solution pH, sample volume, eluent and eluent flow rate were optimized. Under the optimum conditions, good recovery was obtained at about 99.4 ± 0.1 % performed by Flame Atomic Absorption Spectrometry. At optimized pH 2.0 were Au(III) quantitatively sorbed and was recovered with 1:1 mixture of 0.2 M HCl mixed with 0.2 M thiourea. The enrichment factor were found as 125, and the limit of detection were 0.88 μg L -1 whereas limit of quantification is 2.93 μg L -1 . The proposed method was successfully applied in the analysis of tap water, pharmaceutical formulated product and synthetically prepared dummy sample. Equilibrium data also were fitted by linear ...
Selenium nanoparticles (SeNPs) have attracted great attention because of their superior optical p... more Selenium nanoparticles (SeNPs) have attracted great attention because of their superior optical properties and wide utilization in biological and biomedical studies.
In this article, we report a facile strategy for the synthesis of G@SiO2‐AR by using silica nanop... more In this article, we report a facile strategy for the synthesis of G@SiO2‐AR by using silica nanoparticles, which are coated with graphene and alkyd resin. During the synthesis of G@SiO2‐AR, the silica particles have been prepared in situ by hydrolysis of tetraethyl ortho silicate (TEOS). The G@SiO2‐AR has been employed to remove the methylene blue (MB) from aqueous solution. G@SiO2‐AR has a strong affinity to adsorb MB as MB is a cationic dye and it is strongly attracted by anions induced by deprotonation of acid functionality on GO. The detailed adsorption characteristics of G@SiO2‐AR, such as adsorption kinetic and adsorption isotherm has been investigated. The efficiency of dye adsorption on a G@SiO2‐AR has been investigated under various parameters such as contact time, temperature, and pH. The adsorption experiment has been carried out by keeping the constant adsorbent dose in 50 mL of 50 ppm dye solution with varying time intervals such as 5, 10, 15, 20 and 25 min at room temp...
In this study, we focus on the biomimetic development of small molecules and their biological sen... more In this study, we focus on the biomimetic development of small molecules and their biological sensing with DNA.
Abstract Water easily gets contaminated with various contaminants such as dyes, toxic/nontoxic me... more Abstract Water easily gets contaminated with various contaminants such as dyes, toxic/nontoxic metals, and pesticides. A microbial-mediated remediation and separation is an important tool for the removal of hazardous constituents in water. Microbial application in remediation exhibits numerous benefits such as easy availability, green chemistry approach, and being economically viable. This chapter deals with different types of cyanobacteria used for the remediation of polluted water with dyes, pesticides along with separation of toxic/nontoxic metals, the methods applied for dye and pesticide remediation, separation/characterization/identification of separated metals, and analytical tools utilized for calculating the amount of metals separated. Being ubiquitous, cyanobacteria typify as a photosynthetic (autotrophic), N2 fixer, unicellular, and microscale sized, exhibiting rapid reproduction rate. Cyanobacterial species can grow in highly polluted aquatic systems, including synthetic dyes, toxic metals, and also in nutrient-limiting conditions as well as the extreme ecological environment. Cyanobacteria cope with pollutants in different ways such as biotransformation, bioaccumulation, or biosorption of biodegradable or nonbiodegradable pollutants (pesticides, dyes) or toxic metals. Hence, cyanobacterial species are catching attention as a reliable candidate for the remediation and separation of hazardous water contaminants.
Bioinorganic chemistry has achieved great importance by considering environmental and health issu... more Bioinorganic chemistry has achieved great importance by considering environmental and health issues. Here we present anticancer, antioxidant, good protein quencher single pot biosynthesized one dimensional palladium Nanoneedles (PdNNs) as a negative catalyst, where water plays a role of safer solvent. Needle-shaped one-dimensional PdNNs was synthesized using filamentous fungal stain of Aspergillus oryzae (biomass) was successively applied as a suppressant for the growth of human breast, colon and leukemia cancer Cell Lines. Quenching process of bovine serum albumin by PdNNs was spontaneous with hydrogen bonding and hydrophilic interaction. Interaction of protein and PdNNs showed binding constant in the range of 104 M-1 and one binding site. Forster's resonance energy transfer (FRET) theory applied to find out distance between the interaction of PdNNs and protein, where critical distance and energy transfer distance varies with change in concentrations of PdNNs 4.84 x 10−6 M to 9...
Chitosan biological macromolecule is a versatile polymer; chemical modification has been carried ... more Chitosan biological macromolecule is a versatile polymer; chemical modification has been carried out that lead to the formation of chitosan grafted polymers composites (Chito-g-PC). We proposed synthesis of six various Chito-g-PC as sorbents for toxic dyes. A novel graft copolymerization method based on radical polymerization with vinyl monomer like acrylic acid, acrylamide, N-isopropylacrylamide, methacrylic acid and polyacrylonitrile were utilized in order to address the large amount of swelling at four different pH buffers solution. The effect of initiator and monomer concentration, time and temperature on % grafting and % grafting efficiency were performed. Comparative characterization of Chito and Chito-g-PC were evaluated by SEM, XRD and FTIR, as well as solubility characteristics of the composites were determined by various pH buffer solution. Cationic toxic dyes Malachite green (MG) and Methylene blue (MB) were selected as the sorbet, and Chito-g-PC were used as biosorbents....
Journal of Radioanalytical and Nuclear Chemistry, 2015
A solid phase extraction method for separation and enrichment of uranium(VI) was developed using ... more A solid phase extraction method for separation and enrichment of uranium(VI) was developed using Penicillium chrysogenum immobilized on silica mixed with double distilled water. Conditions such as pH, sample flow rate and volume, eluting solution and interfering ions with uranium(VI) optimized and determined spectrophotometrically for quantitative sorbtion. Maximum adsorption found at monolayer was 1.3004 mg/g using Langmuir isotherm. The limits of detection (LOD) and limit of quantification (LOQ) of the proposed method for uranium(VI) was 0.61 μg/L and was 2.02 μg/L respectively. The method developed for the separation and recovery of uranium(VI) was applied sediment samples and tap water samples.
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Papers by DNYANESHWAR KULAL