苯甲酸和磷酸共修饰TiO2降解罗丹明B的研究  

Photodegradation of Rhodamine B with Titanium Dioxide Nanoparticles Modified by Benzoic Acid and Phosphoric Acid

作　　者：林帆 郑凤英 余惠武[1] 李跃海 李顺兴 LIN Fan;ZHENG Feng-ying;YU Hui-wu;LI Yue-hai;LI Shun-xing(Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology,Zhangzhou 363000;College of Chemistry and Environment ,Minnan Normal University ,Zhangzhou 363000)

机构地区：[1]闽南师范大学化学与环境学院,福建漳州363000 [2]福建省现代分离分析科学与技术重点实验室,福建漳州363000

出　　处：《分析科学学报》2018年第2期149-153,共5页Journal of Analytical Science

基　　金：国家自然科学基金(No.21675077,21475055)

摘　　要：通过简单化学吸附法,一步合成苯甲酸和磷酸表面共修饰TiO_2纳米粒子,其表面兼具亲水性、疏水性、亲氧性和负电性。在最佳修饰剂量条件下,氙灯照射2h,TiO_2纳米粒子对阳离子型染料罗丹明B的光降解率可由54.9%分别提高至71.5%、72.8%和91.2%。表面共修饰可实现磷酸基团的亲氧性与苯甲酸基团的疏水性协同作用,提升有机物向非均相光催化剂表面扩散速度和催化剂与水界面溶解O_2的交换速率,达到测定难降解有机污染物化学需氧量(COD)和总有机碳(TOC)的样品前处理要求。Through an ester-like bond, titanium dioxide（TiO2） nanoparticles were modified with benzoic acid（or/and phosphoric acid） by one-step chemisorption. The surface characteristics of TiO2 were improved,with negatively charge, hydrophilicity, hydrophobicity, and oxygen affinity. After irradiation with Xenon lamp for 2 h, the photodegradation ratio of TiO2 for Rhodamine B（as cationic dyes） was improved from 54.9% to 71.5%,72.8%, 91.2% by the surface modification with the optimal dose of benzoic acid, phosphoric acid, benzoic acid and phosphoric acid, respectively. After surface co- modification,the synergistic effect from oxygen affinity of phosphate groups and hydrophobicity of phenyl group could be used to overcome the major obstacles of heterogeneous photocatalysis, including the poor surface coverage of the pollutants on the catalyst and the rapid consumption of oxygen on the TiO2 surface. The photodegradation ratio was enough for the requirement of sample pretreatment for the determination of COD and TOC.

关 键 词：光催化 TIO2 表面修饰 有机污染物 样品前处理 

分 类 号：O657[理学—分析化学]