仿生钛化法制备TiO_(2)-Cu-AC复合光催化剂  

Preparation of TiO_(2)-Cu-AC Composite Photocatalyst by Biomimetic Titanification

作　　者：王晓娟 刘彩 刘芳[1] 黄方[1] WANG Xiaojuan;LIU Cai;LIU Fang;HUANG Fang(College of Chemical Engineering,China University of Petroleum(East China),Qingdao 266580,Shandong,China)

机构地区：[1]中国石油大学(华东)化学工程学院,山东青岛266580

出　　处：《实验室研究与探索》2022年第2期36-40,共5页Research and Exploration In Laboratory

基　　金：青岛市科技惠民专项(17-3-3-76-nsh)。

摘　　要：以海藻为碳源,采用KOH研磨-熔融活化法制备了比表面积2190 m^(2)/g的海藻基活性炭(AC),并利用仿生钛化的方法实现TiO_(2)纳米粒子在AC表面原位生长。进一步复合铜离子获得TiO_(2)-Cu-AC复合光催化剂,用于可见光照射条件下的污染物催化降解。表征结果显示,复合材料中AC、Cu^(2+)与TiO_(2)紧密结合在一起,可见光区吸收较纯TiO_(2)明显增强,禁带宽度降低到2.38 eV,电子-空穴的复合得到了有效抑制。与纯TiO_(2)纳米颗粒相比,TiO_(2)-Cu-AC在可见光照射下降解污染物模型分子罗丹明B的一级反应速率常数是其12.6倍,90 min降解率接近100%。Using alga as the raw material,the alga-based activated carbon(AC)with a specific surface area of 2190 m^(2)/g was prepared through the KOH grinding-melting activation method.The biomimetic mineralization method was used consequently to complete the in-situ growth of TiO_(2)nanoparticles on the AC surface,and the copper ions were further added to synthesize the TiO_(2)-Cu-AC composite photocatalyst for the catalytic degradation of pollutants under visible light irradiation.The characterization results showed that the AC,Cu^(2+)and TiO_(2)in the composite material are closely combined,the visible light region absorption is significantly enhanced compared to pure TiO_(2),the forbidden band width drops to 2.38 eV,and the fluorescence emission efficiency decreases,indicating that the electron-hole recombination is effective reduced.The photocatalytic performance tests demonstrate that the first-order reaction rate constant of Rhodamine B degradation catalyzed by TiO_(2)-Cu-AC composite material under visible light irradiation reaches 12.6 times of that catalyzed by pure TiO_(2)nanoparticles,and the degradation efficiency after 90 min is close to 100%.

关 键 词：生物钛化 生物质转化 复合光催化剂 光催化降解 

分 类 号：TQ174[化学工程—陶瓷工业]