Photocatalytic degradation of organic pollutants in wastewater by heteropolyacids: a review
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Compared with the traditional adsorption filtration method or oxidation method of titanium dioxide and other materials, photocatalytic degradation of organic pollutants is used to generate extremely active free radicals in the reaction system, through combination or substitution of free radicals with organic pollutants. The process degrades pollutants into non-toxic and harmless inorganic substances. This method is widely used due to its environmental protection, energy saving, and easy operation. Among today's many catalysts, heteropoly acids stand out as a green catalyst with unique properties. It has a variety of types, changes in structure, magnetism, conductivity, redox activity and other advantages, showing good application prospects. Researchers have combined multiple materials to make their properties complementary to become more efficient catalysts. This article introduces the latest work of heteropolyacid photocatalysts for treatment of organic pollutants in wastewater, and summarizes the synthesis conditions and catalytic mechanism of several modified heteropolyacids in photocatalysts. Research progress in the field of photocatalysis is reviewed.Keywords:
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Photocatalysis and titanium dioxide photocatalysts is one of the important investigation subjects.In order to make undergraduates majoring in chemistry to grasp the principle of photocatalysis and preparation of photocatalyst,an experiment was designed,including the preparation of nanometer-sized anatase titanium dioxide photocatalyst by the sol-gel method and photocatalytic degradation of methyl orange.
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TiO2 is a kind of widely used photocatalyst in photocatalytic reaction.Because of its excellent photocatalytic characteristic,titanium dioxide photocatalyst has attractive potential applications in various fields of environmental protection.especially wastewater treatment and air purification.In this paper,various carrier and immobilization methods for TiO2 photocatalyst are reviewed,to provide the help to develop high efficient,practical photocatalyst finally.
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The principle of the photocatalytic degradation of organic molecules using titanium dioxide is analyzed.The factors affecting the TiO2 photocatalytic efficiency and recent developments in various photocatalytic methods and relating mechanisms for improving the photocatalytic efficiency of titanium dioxide are summarized.
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Nanosized titanium dioxide is widely used in environmental and material fields such as waste water treatment,air puriffication and antibacteria and self-purification of material surfaces because of its photocatalysis.It is very important to immobilize the photocatalysis onto substrates.This paper is a review about the immobilizations of nanosized titanium dioxide photocatalysis,including immobilization methods,immobilization mechanisms and their qualification.
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Underlayer exposed ZnO:Al-TiO2 coupled films are prepared by different means.Surface morphology by SEM,microstructure by XRD,film thickness by surface profiler and photocatalysis are investigated.In order to explain the enhanced photocatalysis,reaction Ag++→Ag↓ is adopted to clarify the mechanism.It turns out that during the process of photocatalysis the exposed part of the underlayer releases e-and this suppresses recombination of light-induced charges,thus enhanced photocatalysis.
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Titanium dioxide (TiO2) is widely used as a photocatalyst for the purification of industrial wastes. Scientists have attempted to enhance its photocatalytic activity by doping it with metallic and non-metallic elements. Metal dopants can shift TiO2 absorption from ultra violet (UV) to visible light but may reduce photocatalytic efficiency due to recombination centres. Doping TiO2 with non-metals like N, C, S, and F can narrow the energy band gap and improve photocatalytic efficiency. In this work, we studied S-doped TiO2, which combines high photocatalytic activity and structural stability.
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