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以钛酸四丁酯为前驱体,天然凹凸棒石为载体,采用溶胶凝胶法制备了TiO2/凹凸棒石复合光催化剂,并用XRD、TEM对其进行表征。以亚甲基蓝染料为模拟污染物,采用300W汞灯为紫外光源,以光催化实验来评价该催化剂的活性,并研究了H2O2的引入对光催化活性的影响。实验结果表明,H2O2能显著提高染料的脱色效率:亚甲基蓝的初始浓度为50mg/L,催化体系为2mmol/LH2O2+0.5g/LTiO2/凹凸棒石+UV(紫外线),光催化10min后其脱色率为95%,相对于单独的0.5g/LTiO2/凹凸棒石+UV催化体系,其脱色率提高了约50%。全波段扫描显示,加入H2O2后,亚甲基蓝在290nm对应的苯环吸收峰急剧下降,665nm对应的最大吸收峰则近乎消失,且没有新的吸收峰产生。
TiO2 / attapulgite composite photocatalyst was prepared by sol-gel method using tetrabutyl titanate as precursor and natural attapulgite as support, and characterized by XRD and TEM. Using methylene blue dye as a simulated pollutant, a 300W mercury lamp was used as an ultraviolet light source to evaluate the photocatalytic activity of the catalyst. The effect of the introduction of H2O2 on the photocatalytic activity was also studied. The experimental results show that H2O2 can significantly improve the decolorization efficiency of dye: the initial concentration of methylene blue is 50mg / L, the catalytic system is 2mmol / LH2O2 + 0.5g / LTiO2 / attapulgite + UV (ultraviolet) Is 95%, the decolorization rate is increased by about 50% relative to 0.5g / LTiO2 / attapulgite + UV catalytic system alone. Full band scanning showed that the addition of H2O2, methylene blue at 290nm corresponding benzene ring sharp decline in the absorption peak, 665nm corresponding to the maximum absorption peak is almost disappeared, and no new absorption peak.