水滑石基复合催化剂的限域热转化合成及高效降解四环素性能研究

Efficient degradation performance of tetracycline using composite catalysts based on LDHs prepared by domain-limited thermal transformation

以CuMgAl-LDHs水滑石为限域模板插层木质素磺酸钠(LS),通过限域热转化法成功合成了一种新型复合催化剂,用于活化过硫酸盐(PMS)高效降解四环素(TC).通过XRD、FTIR、SEM、Raman等表征方法分析了复合催化剂的结构、形貌和降解性能,并阐述了PMS浓度、催化剂用量、初始pH等参数对TC降解性能的影响以及TC的降解机理.结果表明:该催化剂可以有效地降解TC,15 min内对TC的降解效率可达到97.3%;合成的催化剂具有良好的稳定性和降解性能,3次循环后的TC去除率在15 min内高于90%.自由基猝灭实验表明,复合催化剂体系中硫酸根自由基是反应体系的主要活性物质.

A new composite catalyst was prepared by a domain-limited thermal transformation method using CuMgAl-LDHs as a template intercalated with sodium lignosulfonate(LS),and then was used to activate peroxymonosulfate(PMS)for efficient degradation of tetracycline(TC).The structure,morphology and degradation performance of the composite catalysts were analyzed by XRD,FTIR,SEM,Raman,etc.And the effects of parameters such as PMS concentration,catalyst dosage and initial pH on TC degradation and its degradation mechanism were also described.The degradation results showed that the catalyst could effectively degrade tetracycline,and the degradation efficiency could reach 97.3%within 15 min.The synthesized catalyst had good stability and degradation performance,and the degradation efficiency of TC was higher than 90%even after three cycles.The free radical test showed that the sulfate radical in the system of composite catalyst was the main active substance for the reaction.