Fe3+/TiO2光催化剂降解孔雀绿染料的研究

采用快速溶胶法制备纳米TiO2光催化剂，用Fe^3 对其掺杂改性，并进行了催化剂的X-射线衍射分析(XPd3)，傅立叶红外光谱分析(FT-IR)，BET比表面积的表征，用于光催化降解水中孔雀绿染料的研究．研究了不同催化剂的光催化活性，确定了光催化剂的用量．结果发现60W紫外光辐射80min，孔雀绿可以彻底降解；可见光下，光催化剂对孔雀绿降解120h，其转化率为98%，COD的去除率为75．3%。可见光下孔雀绿的脱色率和COD的变化不一致，并对其产生的原因和孔雀绿的光催化降解机理作了探讨。孔雀绿的光催化降解符合一级动力学反应规律，反应速率常数随催化剂的用量增加而增大，但增大幅度逐渐减小。

DEGRADATION OF MALACHITE GREEN DYE BY FE3+/TIO2 PHOTOCATALYST

The photocatalyst of nano-sized TiO2 powders was prepared by quick solation method and was modified by doping Fe3 . The catalyst was carried out X-ray diffraction analysis, Fourier infra-red spectrum analysis and the characterization of BET specific surface area to study the malachite green dye. Meanwhile, the photocatalytic activities for different catalyst were studied and the dosage of the photocatalyst was determined. It was discovered from the results that malachite green can be degraded fully by 60W UV radiation for 80min; under visible light for the degradation of malachite green by photocatalyst for 120 h, its conversion rate was 98%; COD removal rate,75.3%; and the decolourization of malachite green is not in conformity with the COD change; its cause and the mechanism of photocatalytic degradation were enquired into. The photocatalytic degradation of malachite green conforms the law of the first-order dynamics reaction, the constant of reaction rate increased with increasing dosage of catalyst, but increasing range decreased gradually.