二氧化钛表面浸润性调控增强光催化氧化反应性能  

Surface Wettability Regulation of Titanium Dioxide for Enhanced Photocatalytic Oxidation Reaction Performance

作　　者：卢净宇 刘志萍 盛夏 封心建 LU Jingyu;LIU Zhiping;SHENG Xia;FENG Xinjian(State Key Laboratory of Bioinspired Interfacial Materials Science,College of Chemistry,Chemical Engineering and Materials Science,Soochow University,Suzhou 215123,China;Suzhou Institute for Advanced Research,University of Science and Technology of China,Suzhou 215123,China)

机构地区：[1]苏州大学材料与化学化工学部,仿生界面材料科学全国重点实验室,苏州215123 [2]中国科学技术大学苏州高等研究院,苏州215123

出　　处：《高等学校化学学报》2025年第5期92-99,共8页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21988102,51772198,21975171)资助.

摘　　要：反应界面微环境是影响光催化性能的重要因素.本文通过调控光催化剂的表面浸润性来改变反应界面微环境,构筑了高效的三相界面光催化体系,并用于光催化氧化有机物反应中.将二氧化钛(TiO_(2))纳米颗粒作为模型光催化剂,通过在其表面接枝聚二甲基硅氧烷(PDMS)以提高疏水性.结果表明,疏水PDMS层使得光催化体系在反应界面处形成了气-液-固三相共存的微环境,极大增加了界面氧气(O_(2))的浓度;同时,疏水PDMS层大幅提高了有机分子在催化剂表面的吸附能力.二者的协同作用促进了光催化氧化反应中超氧自由基(•O_(2)^(-))和羟基自由基(•OH)的生成,进而提高了光催化氧化反应效率.研究结果为未来设计构筑高效的催化反应体系提供了新思路.The reaction interface microenvironment is an important factor that affects photocatalytic reaction perfor⁃mance.In this study,a highly efficient triphase interface reaction system was constructed by regulating the surface wettability for photocatalytic oxidation of organic compounds.Titanium dioxide(TiO_(2))nanoparticle is used as a model photocatalyst,polydimethylsiloxane(PDMS)is grafted onto the surface to enhance the hydrophobicity.The results show that the presence of hydrophobic a PDMS layer enables the formation of a gas-liquid-solid triphase coexisting microenvironment at the reaction interface,which increases the interfacial oxygen(O_(2))concentration.Meanwhile,the hydrophobic surface layer enhances the adsorption capability of organic molecule.Such synergistic effect promotes the generation of superoxide radicals(•O_(2)^(-))and hydroxyl radicals(•OH)and enhances the photocatalytic oxidation reaction.This work provides a novel approach to design and construction of efficient catalytic reaction systems.

关 键 词：浸润性调控 反应界面微环境 三相界面 光催化 二氧化钛 

分 类 号：O643[理学—物理化学]