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ZnO和TiO2粒子的光催化活性及其失活与再生
引用本文:井立强,徐自力,孙晓君,尚静,蔡伟民,杜尧国,傅宏刚.ZnO和TiO2粒子的光催化活性及其失活与再生[J].催化学报,2003,24(3):175-180.
作者姓名:井立强  徐自力  孙晓君  尚静  蔡伟民  杜尧国  傅宏刚
作者单位:1. 黑龙江大学化学化工学院,黑龙江哈尔滨,150001;哈尔滨工业大学环境科学与工程系,黑龙江哈尔滨,150001
2. 吉林大学环境科学与工程系,吉林长春,130021
3. 哈尔滨工业大学环境科学与工程系,黑龙江哈尔滨,150001
4. 黑龙江大学化学化工学院,黑龙江哈尔滨,150001
摘    要: 利用XRD,TEM,BET和UV-Vis等测试技术对商品的ZnO及TiO2和纳米ZnO及TiO2粒子进行了表征.无论是商品的还是纳米的,在光催化氧化降解气相n-C7H16和SO2及液相苯酚的反应中,TiO2均表现出比ZnO高的光催化活性,并从光腐蚀性和表面电荷两方面分析了其原因.在光催化氧化降解n-C7H16的反应中,ZnO粒子易失活,而TiO2粒子不易失活.但是,在光催化氧化降解SO2的反应中,ZnO和TiO2粒子均易失活.SPS和XPS测试结果表明,光催化剂表面的导电类型由反应前的n型变成了失活后的p型.这主要是由于反应产物发生吸附所致.失活后的光催化剂可以通过浸洗和干燥再生.

关 键 词:氧化锌  二氧化钛  光催化剂  失活  再生  正庚烷  二氧化硫  苯酚  氧化降解
文章编号:0253-9837(2003)03-0175-06
收稿时间:2003-03-25

Photocatalytic Activity of ZnO and TiO2 Particles and Their Deactivation and Regeneration
JING Liqiang ,XU Zili ,SUN Xiaojun ,SHANG Jing ,CAI Weimin ,DU Yaoguo ,FU Honggang.Photocatalytic Activity of ZnO and TiO2 Particles and Their Deactivation and Regeneration[J].Chinese Journal of Catalysis,2003,24(3):175-180.
Authors:JING Liqiang    XU Zili  SUN Xiaojun  SHANG Jing  CAI Weimin  DU Yaoguo  FU Honggang
Institution:JING Liqiang 1,2*,XU Zili 3,SUN Xiaojun 2,SHANG Jing 3,CAI Weimin 2,DU Yaoguo 3,FU Honggang 1
Abstract:The commercial ZnO and TiO_2,and the nanometer ZnO and TiO_2 particles were characterized by XRD, TEM, BET and UV-Vis techniques, and their photocatalytic activity was evaluated. The results showed that the photocatalytic activity of TiO_2 is higher than that of ZnO, for either commercial or nanometer particles, in the process of degradation of gas phase n-C_7H_ 16 and SO_2 or liquid phase phenol. This result was explained by analysing the effects of light corrosion and surface charges of the photocatalysts on their activity in the process of photocatalytic reaction. Moreover,the lifetime of ZnO and TiO_2 with nanometer particles was examined. The result showed that ZnO lost its activity in the oxidative degradation of n-C_7H_ 16, while TiO_2 nearly kept it. Both ZnO and TiO_2 lost their activity in the oxidative degradation of SO_2. The deactivation mechanism was analysed by characterizing the photocatalysts using SPS and XPS methods, indicating that the deactivation possibly results from the change of the surface conduction type of semiconductor from n-type before the reaction to p-type after the deactivation owing to the adsorption of products. In addition, the deactivated photocatalysts can be regenerated to a nearly full degree by washing and drying.
Keywords:zinc oxide  titania  photocatalyst  deactivation  regeneration  n-heptane  sulfur dioxide  phenol  oxidative degradation
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