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Proceedings ArticleDOI

Tetramethylene glycol mediated hydrothermal synthesis of defect-rich SnO2 nanoparticles for fast adsorption and degradation of MB dye

10 Apr 2018-Vol. 1942, Iss: 1, pp 050023
TL;DR: In this paper, defect-rich pristine tin oxide nanoparticles (SnO2 NPs) with high colloidal stability have been synthesized by tetramethylene glycol (TMG) mediated hydrothermal process and characterized by XRD, TEM, Zeta Potential, PL spectroscopy and porosity measurement techniques.
Abstract: Defect-rich pristine tin oxide nanoparticles (SnO2 NPs) with high colloidal stability have been synthesized by tetramethylene glycol (TMG) mediated hydrothermal process and characterized by XRD, TEM, Zeta Potential, PL spectroscopy and porosity measurement techniques. XRD result suggests the formation of rutile phase of SnO2 with average crystallite size of 2.65 nm. TMG act as a structure directing agent assist in the formation of network like structure of SnO2 NPs as confirmed from TEM. Significant blue shifts in the UV absorption spectrum as that of the bulk and defect bands in the PL spectrum are observed. The nanomaterial possesses very high surface area of 263.102 m2/g and large pore volume. The above properties strongly influence the photocatalytic degradation of methylene blue dye. Very fast adsorption and 96% degradation (under UV irradiation) has been achieved when 10 ppm methylene blue solutions is catalysed by 20 mg SnO2 NPs which pave the way for potential environmental application.Defect-rich pristine tin oxide nanoparticles (SnO2 NPs) with high colloidal stability have been synthesized by tetramethylene glycol (TMG) mediated hydrothermal process and characterized by XRD, TEM, Zeta Potential, PL spectroscopy and porosity measurement techniques. XRD result suggests the formation of rutile phase of SnO2 with average crystallite size of 2.65 nm. TMG act as a structure directing agent assist in the formation of network like structure of SnO2 NPs as confirmed from TEM. Significant blue shifts in the UV absorption spectrum as that of the bulk and defect bands in the PL spectrum are observed. The nanomaterial possesses very high surface area of 263.102 m2/g and large pore volume. The above properties strongly influence the photocatalytic degradation of methylene blue dye. Very fast adsorption and 96% degradation (under UV irradiation) has been achieved when 10 ppm methylene blue solutions is catalysed by 20 mg SnO2 NPs which pave the way for potential environmental application.
Citations
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Book ChapterDOI
01 Jan 2022
TL;DR: In this paper , the reaction pathways followed by the photogenerated electron hole pairs, and fundamental principle and factors affecting the catalytic activity of the nanosized particles are discussed, and the reader can follow the various strategies for enhancing photocatalytic properties of semiconducting materials by making heterojunctions with semiconductor, metal, carbon, or multicomponent oxides.
Abstract: Photocatalysts are widely used for the removal of hazardous pigments, contaminants, microorganisms, and toxic pollutants from the environment. Generally, nanoscale semiconductors are utilized as a catalyst but they are less efficient due to its wider bandgap. Its efficiency can be increased by doping with suitable materials which will reduce the bandgap of the material and also makes the catalyst active in the visible region. This chapter mainly discusses the reaction pathways followed by the photogenerated electron hole pairs, and fundamental principle and factors affecting the catalytic activity of the nanosized particles. This chapter also encourages the reader to follow the various strategies for enhancing photocatalytic properties of semiconducting materials by making heterojunctions with semiconductor, metal, carbon, or multicomponent oxides.

1 citations

References
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Journal ArticleDOI
TL;DR: In this article, the photocatalytic degradation of dyes in aqueous solution using TiO2 as photocatalyst under solar and UV irradiation has been reviewed.
Abstract: Traditional chemical, physical and biological processes for treating wastewater containing textile dye have such disadvantages as high cost, high energy requirement and generation of secondary pollution during treatment process. The advanced oxidation processes technology has been attracting growing attention for the decomposition of organic dyes. Such processes are based on the light-enhanced generation of highly reactive hydroxyl radicals, which oxidize the organic matter in solution and convert it completely into water, CO2 and inorganic compounds. In this presentation, the photocatalytic degradation of dyes in aqueous solution using TiO2 as photocatalyst under solar and UV irradiation has been reviewed. It is observed that the degradation of dyes depends on several parameters such as pH, catalyst concentration, substrate concentration and the presence of oxidants. Reaction temperature and the intensity of light also affect the degradation of dyes. Particle size, BET-surface area and different mineral forms of TiO2 also have influence on the degradation rate.

604 citations

Journal ArticleDOI
TL;DR: In this article, the photoluminescence properties of SnO2 thin films grown by thermal chemical vapor deposition were investigated with different substrate temperatures and X-ray diffraction showed that the crystallinity of the grown thin films increased with increasing substrate temperature.

189 citations

Journal ArticleDOI
TL;DR: This simple procedure provides a new approach to achieve the three conflicting requirements of fast electron transport, slow interfacial electron recombination and large specific surface area simultaneously, which has been demonstrated as a promising strategy to obtain high-efficiency DSSCs.
Abstract: A high-efficiency photoelectrode for dye-sensitized solar cells (DSSCs) should combine the advantageous features of fast electron transport, slow interfacial electron recombination and large specific surface area. However, these three requirements usually cannot be achieved simultaneously in the present state-of-the-art research. Here we report a simple procedure to combine the three conflicting requirements by using porous SnO2 nanotube–TiO2 (SnO2 NT–TiO2) core–shell structured photoanodes for DSSCs. The SnO2 nanotubes are prepared by electrospinning of polyvinyl pyrrolidone (PVP)/tin dichloride dihydrate (SnCl2·2H2O) solution followed by direct sintering of the as-spun nanofibers. A possible evolution mechanism is proposed. The power conversion efficiency (PCE) value of the SnO2 NT–TiO2 core–shell structured DSSCs (∼5.11%) is above five times higher than that of SnO2 nanotube (SnO2 NT) DSSCs (∼0.99%). This PCE value is also higher than that of TiO2 nanoparticles (P25) DSSCs (∼4.82%), even though the amount of dye molecules adsorbed to the SnO2 NT–TiO2 photoanode is less than half of that in the P25 film. This simple procedure provides a new approach to achieve the three conflicting requirements simultaneously, which has been demonstrated as a promising strategy to obtain high-efficiency DSSCs.

145 citations

Journal ArticleDOI
TL;DR: Evidence is presented that aniline (the toxin) and methylene blue are in fact remarkably similar and additive in some of their effects on erythrocytes and that repeated injections of methyleneblue can markedly aggravate subsequent haemolysis without further lowering methaemoglobin content.
Abstract: Summary. The similarity between poison and antidote was known to the ancient Greeks who used the same word, pharmakon, for both. This paper presents evidence that aniline (the toxin) and methylene blue (the therapy) are in fact remarkably similar and additive in some of their effects on erythrocytes. Studies were prompted by a case of aniline-induced methaemoglobinaemia in which two injections of methylene blue did not rapidly eliminate cyanosis and were followed by severe, delayed haemolysis. Interactions between aniline and methylene blue were studied in cats which, although showing important differences from man in their haemoglobin and splenic vasculature, represent a useful model. Methylene blue potentiated the oxidative denaturation of haemoglobin by aniline as judged by the size and number of Heinz bodies and their turbidity in haemolysate. It also aggravated and prolonged the fall in erythrocyte reduced glutathione content which occurred at a time of maximum Heinz body production. While methylene blue in judicious dosage will reduce the content of methaemoglobin after aniline exposure, it may not eliminate visible cyanosis. Repeated injections of methylene blue can markedly aggravate subsequent haemolysis without further lowering methaemoglobin content.

112 citations

Journal ArticleDOI
TL;DR: Results provide evidence that E. crassipes is an effective and inexpensive biomaterial for dye removal from aqueous dye solutions and industrial effluents.
Abstract: Adsorption of methylene blue (MB) from aqueous solution using dried roots, stems, and leaves of Eichhornia crassipes biomass obtained from Lake Victoria was studied. Batch experimental results revealed that the adsorption process was highly dependent on adsorbent dosage, initial MB concentration, E. crassipes particle size and aqueous solution temperature. The isotherm data fitted Freundlich mathematical models with maximum dye adsorption of 35.37 mg g(-1). Roots adsorbed over 99 % of the MB in <5 min. Sorption kinetics followed a pseudo-second-order model. Results provide evidence that E. crassipes is an effective and inexpensive biomaterial for dye removal from aqueous dye solutions and industrial effluents.

42 citations