分子印迹-TiO_(2)光电催化降解增溶PHE废水性能研究  

Preparation of molecularly imprinted-TiO_(2)and its properties of photoelectrocatalytic degradation of solubilized PHE

作　　者：杨欣 彭啸 薛凯茹 苏梦威 吴燕 YANG Xin;PENG Xiao;XUE Kairu;SU Mengwei;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：《化工学报》2023年第8期3564-3571,共8页CIESC Journal

基　　金：国家自然科学基金项目(21806122)。

摘　　要：分别以菲(PHE)、非离子表面活性剂曲拉通X-100及两者的混合物作为模板,钛酸正丁酯为功能单体,通过溶胶-凝胶法,制备得到三种分子印迹-TiO_(2)[MIP-(TX-100)TiO_(2),MIP-(PHE)TiO_(2),MIP-(TX-100+PHE)TiO_(2)],并且制备对应的薄膜电极,用于光电催化处理模拟土壤淋洗增溶废水PHE。通过XRD、氮气吸附脱附、SEM对MIP-TiO_(2)材料及其薄膜电极进行性能表征。结果表明,MIP-(TX-100)TiO_(2)中,TX-100印迹分子的引入会改变晶体结构,出现金红石晶相TiO_(2),且其比表面积达到63.533 m^(2)/g,TiO_(2)颗粒大小及分散性较为良好,团聚现象也得到了一定的改善,其对TX-100(5 g/L)增溶的PHE(30 mg/L)溶液光电催化降解率可达74.45%。MIP-(TX-100)TiO_(2)电极对增溶废水PHE的吸附过程更符合二级动力学模型,该过程主要受化学吸附所控制。推测分子印迹过程使TiO_(2)产生大量印迹空穴,在光电催化过程中印迹空穴富集TX-100后,使PHE破除胶束障碍,从而提高了PHE的降解效率。Three types of molecularly imprinted-TiO_(2)(MIP-TiO_(2))were prepared by sol-gel method using phenanthrene(PHE),the Triton X-100(TX-100)and their mixture as templates,respectively,and n-butyl titanate as the functional monomer.The corresponding thin film electrodes were prepared for treating simulated soil washing effluent within solubilized PHE by photoelectrocatalytic method.The properties of the MIP-TiO_(2)and their thin film electrodes were characterized by XRD,nitrogen adsorption-desorption and SEM.The results showed that MIP-(TX-100)TiO_(2)present outstanding property of removal solubilized PHE.With TX-100 as imprinted molecules,the crystallization of MIP-(TX-100)TiO_(2)appears rutile phase,its specific surface area reached 63.533 m^(2)/g,and the agglomeration of nanoparticles was also improved.The adsorption process of MIP-(TX-100)electrode towards solubilized PHE(30 mg/L)by TX-100(5 g/L)followed the secondary kinetic model,which suggested that the process was mainly controlled by chemisorption.It is speculated that TiO_(2)produces a large number of imprinted holes due to the molecular imprinting process.After the imprinted holes are enriched in TX-100 during the photocatalytic process,PHE breaks the micelle barrier,thereby improving the degradation efficiency of PHE.

关 键 词：分子印迹 TiO_(2) 催化剂 表面活性剂 菲 废水 

分 类 号：O643[理学—物理化学]