TiO₂-CS微球光催化降解阳离子桃红的研究

TiO 2 -CS微球光催化降解阳离子桃红的研究 Study on the Photocatalytic Degradation of Cationic Pink FG by Using TiO 2 -CS Microbeads 陈水平 CHEN Shui-ping 1 2 first-author 汪玉庭 WANG Yu-ting 1 2 武汉大学资源与环境科学学院 武汉大学资源与环境科学学院 College of Resources and Environmental Sciences, Wuhan University College of Resources and Environmental Sciences, Wuhan University 武汉大学资源与环境科学学院,湖北,武汉,430072 武汉大学资源与环境科学学院,湖北,武汉,430072 采用TiO2和壳聚糖（CS）共混,通过反相悬浮、交联制备了TiO2 CS微球光催化剂,并用紫外灯光源,研究了TiO2 CS微球对阳离子桃红染料的光催化降解过程.结果表明:TiO2 CS微球能显著地光催化降解阳离子桃红溶液,在pH10时,20mg/L阳离子桃红溶液经紫外光照射100min后,色度去除率达62.4%,化学需氧量（COD）去除率为34.2%;重复使用56h后,TiO2 CS微球的催化效力降低5.2%;在阳离子桃红溶液浓度低于40mg/L,pH10的条件下,TiO2 CS微球催化阳离子桃红溶液的光降解反应为假一级动力学反应;在弱碱性的条件下,TiO2 CS微球对阳离子桃红溶液光催化脱色效率较高;TiO2含量较高的TiO2 CS微球、较长的降解时间和适当的TiO2 CS微球用量能有效地光催化降解阳离子桃红溶液,其中溶液的色度去除速度要快于溶液中的COD的去除速度. TiO 2 was immobilized on CS microbeads using emulsion dispersion method and cross-linking processing. The photocatalytic degradation of cationic pink FG solution was studied using TiO 2 -CS microbeads as catalyst under a 253.7 nm UV lamp. The experimental results show that cationic pink FG is degraded efficiently and the discoloration rate of solution is higher than remove rate of COD; the discoloration rate and the remove rate of COD is 62.4% and 34.2% respectively after cationic pink FG is irradiated with pH 9～12 under UV light for 100 min; the catalytic effect of TiO 2 -CS microbeads is only dropped （5.2%） after using 56 h. Under the conditions of pH=10 and initial Cationic Pink FG concentration below 40 mg/L, the photochemical discoloration reaction is expressed as pseudo-first order kinetics; Effects of the ratio of TiO 2 in the catalyst, value of pH, degradation time and dosage of catalyst on the dye degradation are investigated in detail. 光催化 壳聚糖 阳离子桃红 TiO2 photocatalysis chitosan cationic pink FG TiO2 X703 教育部博士点基金资助项目（200048615） 2003-06-01 2021-04-01 6