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Journal ArticleDOI

Electrochemical heavy metal detection, photocatalytic, photoluminescence, biodiesel production and antibacterial activities of Ag–ZnO nanomaterial

TL;DR: In this paper, the results reveal that Ag-ZnO Nps shows the better photocatalytic activity compared to undoped ZnO nps, and also developed sensor which showed a linearity in the concentration range 50-350 nM and limit of detection was found to be 3.5 and 3.8 nM (3σ) for lead and cadmium respectively.
About: This article is published in Materials Research Bulletin.The article was published on 2017-10-01. It has received 258 citations till now. The article focuses on the topics: Zinc.
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Journal ArticleDOI
TL;DR: The background information and developments from pure TiO2 to chemically modified TiO1-based materials as photocatalysts were discussed in detail, which covered their basic properties and their role in the air pollutant removal.

199 citations

Journal ArticleDOI
TL;DR: Current advancements of ZnO nanomaterial-based chemical sensors, including the effect of size, morphologies, compositions and their respective working mechanisms along with the selectivity, sensitivity, detection limit, stability, etc., are introduced.
Abstract: Recent advancement in nanoscience and nanotechnology has witnessed numerous triumphs of zinc oxide (ZnO) nanomaterials due to their various exotic and multifunctional properties and wide applications. As a remarkable and functional material, ZnO has attracted extensive scientific and technological attention, as it combines different properties such as high specific surface area, biocompatibility, electrochemical activities, chemical and photochemical stability, high-electron communicating features, non-toxicity, ease of syntheses, and so on. Because of its various interesting properties, ZnO nanomaterials have been used for various applications ranging from electronics to optoelectronics, sensing to biomedical and environmental applications. Further, due to the high electrochemical activities and electron communication features, ZnO nanomaterials are considered as excellent candidates for electrochemical sensors. The present review meticulously introduces the current advancements of ZnO nanomaterial-based chemical sensors. Various operational factors such as the effect of size, morphologies, compositions and their respective working mechanisms along with the selectivity, sensitivity, detection limit, stability, etc., are discussed in this article.

140 citations


Cites methods from "Electrochemical heavy metal detecti..."

  • ...In addition, ZnO nanoparticles in combination with Ag nanostructures were also employed for the determination of Pb2+ and Cd2+ ions in a buffer media with the pH of the reaction media equivalent to 5 [99]....

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Journal ArticleDOI
TL;DR: In this paper, the photocatalytic activity for degradation of methylene blue dye was investigated under UV light irradiation and compared with hydrogen peroxide-assisted and catalytic HPC degradation, catalytic HPO oxidation, and adsorption processes for dye removal from aqueous solution.

100 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed using enzymes as the catalysts to overcome the drawbacks of chemical synthesis for the production of biodiesel using renewable and sustainable feedstocks like plant derived oils.

88 citations

Journal ArticleDOI
TL;DR: In this paper, copper doped TiO 2 nanoparticles with reduced graphene oxide as a solid support were introduced as new ambient light antimicrobial agents, which increased the activity to the visible light and enhanced charge transport during photocatalytic degradation of microorganisms.

83 citations

References
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Journal ArticleDOI
TL;DR: Recommendations of the National Committee for Clinical Laboratory Standards continue to be based on this publication; the “Kirby-Bauer” method is, among the many disk methods used in other countries, still the one that has been researched most thoroughly and updated continuously.
Abstract: In the words of the authors, the paper by A. W. Bauer et al., from the University of Washington in Seattle, on a standardized single-disk method for antibiotic susceptibility testing “. . . consolidate(s) and update(s) previous descriptions of the method and provide(s) a concise outline for its performance and interpretation.” Clinical microbiologists were relieved that finally a disk diffusion method had been standardized, could be used with ease, and provided reliable results as compared with minimum inhibitory concentration tests. The pivotal role of Hans Ericsson’s theoretical and practical studies (H. Ericsson and G. Svartz-Malmberg, Antibiot. Chemother. 6:41–74, 1959), as well as earlier reports by some of the authors of the publications cited, must be mentioned as a matter of fairness. Most of the recommendations given are still valid today even though some of the antimicrobial agents are obsolete, new ones have been added, some zone sizes had to be modified, and new media were designed for Haemophilus influenzae and Neisseria gonorrhoeae. Recommendations of the National Committee for Clinical Laboratory Standards continue to be based on this publication; the “Kirby-Bauer” method is, among the many disk methods used in other countries, still the one that has been researched most thoroughly and updated continuously. ALEXANDER VON GRAEVENITZ

16,916 citations

Journal ArticleDOI
TL;DR: In this article, the transesterification reaction is aected by molar ratio of glycerides to alcohol, catalysts, reaction temperature, reaction time and free fatty acids and water content of oils or fats.

4,902 citations

Journal ArticleDOI
TL;DR: ZnO has received much attention over the past few years because it has a wide range of properties that depend on doping, including a range of conductivity from metallic to insulating (including n-type and p-type conductivity), high transparency, piezoelectricity, widebandgap semiconductivity, room-temperature ferromagnetism, and huge magneto-optic and chemical-sensing effects.

1,828 citations

Journal ArticleDOI
TL;DR: The enhanced performance of g-C(3)N(4)-based nanocomposites has been widely employed in environmental and energetic applications such as photocatalytic degradation of pollutants, photoc atalytic hydrogen generation, carbon dioxide reduction, disinfection, and supercapacitors.
Abstract: Graphitic carbon nitride (g-C3N4), as an intriguing earth-abundant visible light photocatalyst, possesses a unique two-dimensional structure, excellent chemical stability and tunable electronic structure. Pure g-C3N4 suffers from rapid recombination of photo-generated electron–hole pairs resulting in low photocatalytic activity. Because of the unique electronic structure, the g-C3N4 could act as an eminent candidate for coupling with various functional materials to enhance the performance. According to the discrepancies in the photocatalytic mechanism and process, six primary systems of g-C3N4-based nanocomposites can be classified and summarized: namely, the g-C3N4 based metal-free heterojunction, the g-C3N4/single metal oxide (metal sulfide) heterojunction, g-C3N4/composite oxide, the g-C3N4/halide heterojunction, g-C3N4/noble metal heterostructures, and the g-C3N4 based complex system. Apart from the depiction of the fabrication methods, heterojunction structure and multifunctional application of the g-C3N4-based nanocomposites, we emphasize and elaborate on the underlying mechanisms in the photocatalytic activity enhancement of g-C3N4-based nanocomposites. The unique functions of the p–n junction (semiconductor/semiconductor heterostructures), the Schottky junction (metal/semiconductor heterostructures), the surface plasmon resonance (SPR) effect, photosensitization, superconductivity, etc. are utilized in the photocatalytic processes. Furthermore, the enhanced performance of g-C3N4-based nanocomposites has been widely employed in environmental and energetic applications such as photocatalytic degradation of pollutants, photocatalytic hydrogen generation, carbon dioxide reduction, disinfection, and supercapacitors. This critical review ends with a summary and some perspectives on the challenges and new directions in exploring g-C3N4-based advanced nanomaterials.

1,382 citations

Journal ArticleDOI
TL;DR: In this article, the catalytic activity of several solid base and acid catalysts, particularly metal oxides and supported metal oxide, was reviewed for transesterification and esterification reactions simultaneously and converted oils with high amount of Free Fatty Acids.

767 citations