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采用溶胶-凝胶法将Keggin型H4Si W12O40负载在Si O2上,并用30%H2O2溶液对其进行敏化,制得H4Si W12O40/Si O2/H2O2光催化剂,分别利用傅里叶变换红外光谱仪(FT-IR)、X射线衍射(XRD)对该光催化剂进行表征分析,结果表明H4Si W12O40高度分散在Si O2上,并且经过H2O2溶液处理的光催化剂在935.2 cm-1出现了一个较弱的过氧基吸收峰,这与过氧多酸化合物的吸收峰较一致。另外,进行甲基橙模拟废水溶液在黑暗条件下的吸附-脱附平衡实验,结果表明在30 min达到吸附-脱附平衡,故优化组实验选择在黑暗下搅拌30 min以达到吸附-脱附平衡。接着对甲基橙的初始浓度、溶液p H以及催化剂用量进行优化。实验发现,在甲基橙初始浓度为15 mg·L-1,溶液p H为1.0,催化剂的用量为6 g·L-1的优化情况下,光降解3.0 h,甲基橙的降解率达到99.0%,H4Si W12O40/Si O2/H2O2光催化降解甲基橙溶液的过程符合一级动力学反应规律;且H4Si W12O40/Si O2/H2O2对甲基紫、孔雀石绿、亚甲基蓝、罗丹明B和甲基红均具有较高的光催化活性,降解率达87.5%~100.0%。
The Keggin H4Si W12O40 was supported on Si O2 by sol-gel method and sensitized with 30% H2O2 solution to prepare H4Si W12O40 / Si O2 / H2O2 photocatalysts. The Fourier transform infrared spectroscopy (FT -IR) and XRD were used to characterize the photocatalyst. The results showed that H4Si W12O40 was highly dispersed on Si O2, and the photocatalyst treated with H2O2 showed a weaker overheating at 935.2 cm-1 Base absorption peak, which is more consistent with the absorption peak of peroxy polyacid compound. In addition, the adsorption-desorption equilibrium experiment of methyl orange simulated wastewater solution under dark conditions was carried out. The results showed that adsorption-desorption equilibrium was reached at 30 min, so the experimental group in the optimized group was stirred for 30 min in the dark to achieve the adsorption-desorption balance. The initial methyl orange concentration, the solution p H, and the amount of catalyst were then optimized. The results showed that the degradation rate of methyl orange reached 3.0 mg · L-1 for methyl orange at initial concentration of 3.0 mg · L-1, the solution pH was 1.0 and the amount of catalyst was 6 g · L-1. 99.0%. The photocatalytic degradation of methyl orange solution by H4Si W12O40 / Si O2 / H2O2 conformed to the first-order kinetics. The effect of H4Si W12O40 / Si O2 / H2O2 on methyl violet, malachite green, methylene blue, rhodamine B and Methyl red are higher photocatalytic activity, the degradation rate of 87.5% to 100.0%.