化工学报 ›› 2023, Vol. 74 ›› Issue (8): 3564-3571.DOI: 10.11949/0438-1157.20230304

• 能源和环境工程 • 上一篇    下一篇

分子印迹-TiO2光电催化降解增溶PHE废水性能研究

杨欣(), 彭啸(), 薛凯茹, 苏梦威, 吴燕   

  1. 天津科技大学化工与材料学院,天津 300457
  • 收稿日期:2023-03-28 修回日期:2023-06-26 出版日期:2023-08-25 发布日期:2023-10-18
  • 通讯作者: 彭啸
  • 作者简介:杨欣(1998—),女,硕士研究生,1540194146@qq.com
  • 基金资助:
    国家自然科学基金项目(21806122)

Preparation of molecularly imprinted-TiO2 and its properties of photoelectrocatalytic degradation of solubilized PHE

Xin YANG(), Xiao PENG(), Kairu XUE, Mengwei SU, Yan WU   

  1. College of Chemical Engineering and Materials Science, Tianjin University of Science & Technology, Tianjin 300457, China
  • Received:2023-03-28 Revised:2023-06-26 Online:2023-08-25 Published:2023-10-18
  • Contact: Xiao PENG

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-TiO2[MIP-(TX-100)TiO2,MIP-(PHE)TiO2,MIP-(TX-100+PHE)TiO2],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-TiO2材料及其薄膜电极进行性能表征。结果表明,MIP-(TX-100)TiO2中,TX-100印迹分子的引入会改变晶体结构,出现金红石晶相TiO2,且其比表面积达到63.533 m2/g,TiO2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)TiO2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TiO2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。

关键词: 分子印迹, TiO2, 催化剂, 表面活性剂, 菲, 废水

Abstract:

Three types of molecularly imprinted-TiO2 (MIP-TiO2) 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-TiO2 and their thin film electrodes were characterized by XRD, nitrogen adsorption-desorption and SEM. The results showed that MIP-(TX-100) TiO2 present outstanding property of removal solubilized PHE. With TX-100 as imprinted molecules, the crystallization of MIP-(TX-100) TiO2 appears rutile phase, its specific surface area reached 63.533 m2/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 TiO2 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.

Key words: molecular imprinting, TiO2, catalyst, surfactants, PHE, waste water

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