摘要
以钛酸丁酯、硝酸铋及钨酸钠为前体,采用溶胶凝胶法及溶剂热法制备Bi_2WO_6-TiO_2复合光催化剂,运用X射线衍射(XRD)、紫外-可见光吸收光谱(UV-vis)、扫描电镜(SEM)、能谱分析(EDS)及光电流等方法表征复合材料的结构。考察了Bi_2WO_6-TiO_2复合光催化剂对Cu(Ⅰ)-EDTA络合水体复合污染的处理性能以及光反应后复合催化剂的新用途,并对其协同处理机制进行探讨。结果表明:相较于单一Cu(Ⅱ)及EDTA,该复合光催化剂在可见光下表现出对Cu(Ⅱ)-EDTA络合水体更高的处理效率。当Bi_2WO_6含量为5%时,复合光催化剂表现出最高的光催化活性。沉积过Cu及Cu O的Bi_2WO_6-TiO_2光催化剂对有机污染物的光降解效率有着显著提升。
The Bi2WO6-TiO2 composite photocatalysts were prepared by sol-gel and solvent-thermal method with butyl titanate, bismuth nitrate and sodium tungstate as precursors. The structure of the samples was characterized by X-ray diffraction （XRD）, ultraviolet-visible spectroscopy （UV-vis）, scanning electron microscope （SEM）, energy dispersive spectrometer （ EDS ） and photoelectrochemical measurements. The photocatalytic performance of Bi2WO6-TiO2 on the treatment of Cu（II）-EDTA combined pollutions in complexing water and the new application of used photocatalysts were investigated. Furthermore, the synergetic treatment mechanism for the combined pollutions was discussed. The results demonstrated that the composite photocatalyst exhibited higher treatment efficiency for Cu（ II ）-EDTA combined pollutions than that for single Cu（ II ） or EDTA under visible light irradiation. The composite showed the best photocatalytic activity when the Bi2WO6 content reached to 5%. The Bi2WO6-TiO2 composite with Cu and CuO deposited remarkably improved the photocatalytic degradation of organic pollutions.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2017年第6期2164-2170,共7页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(21577039
21277051)
广东省科技计划(2015A020215004)
中央高校基础研究项目(2015ZQ08
2015KXKYJ07)
