Zinc Tungstate Photocatalytic Degradation of Four Chlorophenol Wastewater
Four chlorophenol is a major component of biological pesticides, wood preservatives, dyes and rust removing agents.
Four chlorophenol is also used in Asia, Africa and South America to prevent and control schistosomiasis; In addition, biological treatment of municipal wastewater and industrial waste water also contains chlorophenols. Four chlorophenol wastewater is a kind of three toxic agent, which is carcinogenic, teratogenic and mutagenic. It is easy to cause serious pollution to the environment and is difficult to decompose, therefore, the United States Environmental Protection Agency (EPA) has included it in the list of 129 priority environmental control pollutants.
In recent years, the application of semiconductor photocatalysis technology in environmental management has received extensive attention, among them, the tungstate semiconductor photocatalyst, with its non-toxic and high photocatalytic activity, has gradually replaced the early physical and chemical treatment methods with poor efficiency and high cost, while the zinc tungstate tungstate is four chlorophenol wastewater sniper.
Compared with the traditional physical and chemical methods, the advantage of treating four chlorophenol wastewater with zinc tungstate is simple operation, mild reaction conditions, non-toxic and environmental protection, and the effect is outstanding.
Some scholars used zinc tungstate doped with fluorine to synthesize zinc tungstate photocatalyst, in the test of four chlorophenol, four chlorophenol is firstly adsorbed on the surface of nano ZnWO4, when ZnWO4 absorbs light greater than or equal to the energy of the band gap, photogenerated holes and electrons are produced, four chlorophenol was degraded simultaneously in two ways. During the reaction, the hole and electron move toward ZnWO4, and the photogenerated hole reacts with them directly to form hydroxyl radical, photogenerated electrons are trapped by oxygen molecules adsorbed on the surface to produce superoxide anions, superoxide anion is further protonated to form hydroxyl radicals, and hydroxyl radicals react directly with benzene rings, resulting in CO2 and H2O.
The photocatalytic activity of four chlorophenol wastewater can be obviously improved by using zinc tungstate as photocatalyst, the results show that the total degradation rate of four chlorophenol wastewater reaches 95% after visible light catalysis of 12h, this shows that sodium tungstate has a very good effect on four chlorophenol, and this is also the gospel of the vast population of water pollution areas.
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