摘要
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。
Cesium salts of heteropolytungstate were synthesized from H_3PW_(12)O_(40) and Cesium carbonate(CS_2CO_3) by chemical precipitation method to investigate the photocatalytic performance.This photocatalysis materials were characterized by FT-IR,XRD,nitrogen adsorption and UV-vis diffuse reflection absorption spectra.XRD spectra showed that Cs_xH_(3-x)PW_(12)O_(40) was composed of H_3PW_(12)O_(40) and Cs_3PW_(l2)O_(40).The surface area of Cs_xH_(3-x)PW_(12)O_(40) was improved with Cs amount increasing from 0.5 to 3.UV-vis absorption wavelength in 360 nm shifted to 350 nm,indicating the dramatically promoted optical absorption of photocatalyst.The photocatalytic efficiency of the catalyst was evaluated by degradation of methyl violet in water under UV light irradiation.The results showed that Cs_xH_(3-x)PW_(12)O_(40) had dramatically improvement in photocatalytic activity.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2012年第S3期639-642,共4页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(21103154,20801050,21001098,971116)
Zhejiang Provincial Natural Science Foundation of China(Y4090475,Y4080114,Y4090592,Y4100495,4090462)
关键词
光催化
杂多酸铯盐
甲基紫
降解
photocatalysis
cesium heteropolytungstate
methyl violet
degradation
