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采用定量滴定沉淀法制备了一系列铯离子取代的磷钨杂多酸盐Cs_xH_(3-x)PW_(12)O_(40)光催化剂,利用傅立叶变换红外光谱(FT-IR)、X射线衍射(XRD)、氮气吸附(N_2-adsorption)和紫外可见吸收光谱(UV-Vis)等手段对其进行了表征。结果表明不同取代的杂多酸盐是H_3PW_(12)O_(40)和Cs_3PW_(12)O_(40)的混合物;催化剂的比表面积随铯离子取代量的增加而增大:紫外可见吸收光谱结果表明铯离子取代后吸收向紫外区移动,有利于光催化反应。同时研究了杂多酸铯盐作为光催化剂对模拟染料废水甲基紫溶液的光催化降解性能,实验结果表明同时具有大比表面积和酸性的Cs_2HPW_(12)O_(40)和Cs_(2.5)H_(0.5)PW_(12)O_(40)对染料废水有较好的光催化降解效果。
A series of Cs_xH_ (3-x) PW_ (12) O_ (40) photocatalysts substituted by cesium ion were prepared by quantitative titration and precipitation method. Their structures and structures were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), nitrogen adsorption (N_2-adsorption) and UV-Vis absorption spectroscopy. The results showed that different substituted heteropolyacid salts were a mixture of H_3PW_ (12) O_ (40) and Cs_3PW_ (12) O_ (40). The specific surface area of the catalyst increased with the increase of cesium ion substitution. It indicates that the absorption of cesium ion shifts to the ultraviolet region after the substitution, which is good for the photocatalytic reaction. At the same time, the photocatalytic degradation of methyl violet solution of simulated dye wastewater with cesium heteropoly acid as photocatalyst was studied. The experimental results show that Cs 2 HPW 12 O 40 and Cs 2.5 H 2 O with large specific surface area and acidity, (0.5) PW_ (12) O_ (40) has good photocatalytic degradation effect on dye wastewater.