TiO2/PC-CS的制备及光催化降解甲苯增溶废水的研究  

Preparation of TiO/PC-CS and photocatalytic degradation of solubilized toluene in wastewater

作　　者：王爱静 吴腾飞 彭啸 郭凤南 史宁 陆晓慧 杨春蕾 吴燕 WANG Aijing;WU Tengfei;PENG Xiao;GUO Fengnan;SHI Ning;LU Xiaohui;YANG Chunlei;WU Yan(College of Chemical Engineering and Materials Science,Tianjin University of Science&Technology,Tianjin 300457,China)

机构地区：[1]天津科技大学化工与材料学院,天津300457

出　　处：《功能材料》2020年第9期9193-9200,共8页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(21806122);大学生创新创业资助项目(201910057220)。

摘　　要：采用溶胶凝胶-水热法制备具有双功能微区的TiO2/PC-CS复合材料。利用SEM、XRD、接触角、N2吸附/脱附曲线和FT-IR等手段对复合材料结构进行表征。通过光催化降解实验,研究复合材料对表面活性剂TX-100增溶甲苯的光催化降解过程以及机理。研究表明:多孔碳具有发达的孔洞结构、较大比表面积,具有良好的吸附性能;负载CS和TiO2后,复合材料的界面亲水性得到调节,且TiO2与PC-CS界面形成了Ti-O-C键;复合材料TiO2/10%(PC-CS)对TX-100增溶甲苯的光催化降解过程符合拟一级动力学方程,相关系数均在0.97以上;由甲苯和TX-100的光催化降解效果对比可知,复合材料对甲苯增溶废水具有选择性吸附降解效果;25℃下,当TX-100浓度为0.2 mmol/L,TiO2/10%(PC-CS)是复合材料中性能最优异的,甲苯的光催化降解效率为87.45%。In this study,a novel photocatalyst of TiO2/porous carbon-carbon sphere(TiO2/PC-CS)composites was prepared by a sol-gel combined hydrothermal method.The obtained materials were characterized via SEM,XRD,contact angle analysis,N2 adsorption-desorption and FT-IR.The photocatalytic performance was measured by degrading the simulated wastewater contained toluene solubilized by TX-100.Based on the characterizations and photocatalytic results,a possible photocatalytic mechanism was proposed.The results reveal that the as-obtained PC showed favorable features for adsorption,such as high specific surface area and developed pore structure.After loading CS and TiO2,the interface hydrophilicity of the composites was adjusted,and Ti-O-C bond was formed between TiO2 and PC-CS.The photocatalytic degradation process of solubilized toluene was consistent with the pseudo-first-order kinetic equation,and the correlation coefficient was above 0.97.Compared with photocatalytic degradation effect of toluene and TX-100,it could be seen that the TiO2/PC-CS had selective adsorption and degradation ability in treating solubilized toluene in wastewater.In the case of the concentration of TX-100 was 0.2 mmol/L at 25℃,the selective photocatalytic degradation efficiency of TiO2/10%(PC-CS)towards toluene was as high as 87.45%.

关 键 词：溶胶凝胶-水热法 多孔碳-碳球 光催化降解 增溶 甲苯 

分 类 号：O643[理学—物理化学]