La1-XSrXFeO3催化剂的制备及其催化氧化孔雀石绿性能分析

Preparation of La1-XSrXFeO3 catalyst and its catalytic performance for oxidation of malachite green

为提高非均相类芬顿催化剂活性,采用柠檬酸溶胶凝胶法制备La1-XSrXFeO3催化剂,利用类芬顿催化氧化处理孔雀石绿模拟废水;考察络合剂投加量、凝胶温度、Sr掺杂量、煅烧温度、pH及H 2O 2投加量等因素对孔雀石绿降解效果的影响,采用XPS、XRD分析法对催化剂进行表征。结果表明:Sr的掺杂量X为0.4、金属离子与络合剂摩尔比为1∶3、水浴凝胶温度为80℃、煅烧温度为600℃时,制得的催化剂性能最好;最佳反应条件为pH=7,催化剂投加量为0.05 g,H 2O 2投加量为0.4 mL,反应5 min,孔雀石绿去除率超过90.00%,反应10 min为97.92%。改性后催化剂结构未发生变化,但是晶体比表面积变大,晶体中活泼氧原子增加。制备的催化剂5次重复使用仍具有良好的催化活性。该结果可以缩短反应时间及提高废水处理效果。

In order to improve the activity of the catalyst,La1-XSrXFeO3 catalyst is prepared by Sol-Gel method and its catalytic performance for Fenton-like oxidation of malachite green simulated wastewater is investigated.Investigating the effects of complexing agent dosage,gel temperature,Sr doping amount,calcination temperature,pH and H 2O 2 dosage on the degradation of malachite green,and characterization of the catalyst by XPS and XRD analysis.The results show that the catalyst with the best catalytic performance was prepared when the doping amount of Sr is X=0.4,the molar ratio of metal ion to citric acid is 1∶3,the temperature of the water bath gel is 80℃,and the calcination temperature is 600℃.The optimal reaction condition is that the value of pH is 7,the dosage of the catalyst is 0.05 g,and the dosage of H 2O 2 is 0.4 mL.The removal rate of malachite green for 5 min was 90.00%,and that of 10 min was 97.92%.The structure of the catalyst did not change,but it increases the crystal surface area and active oxygen atoms in crystal.The catalyst has good catalytic activity after repeated use for 5 times.This experiment can shorten the reaction time and improve the waste water treatment effect.