碳包覆中空磁性微球活化过硫酸盐降解水中甲氧苄啶  

Degradation of trimethoprim in water by persulfate activated based on carbon-coated hollow magnetic microspheres

作　　者：孙彬 徐佳敏 高仕谦[1] 张占恩[1] SUN Bin;XU Jiamin;GAO Shiqian;ZHANG Zhan’en(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou,215009,China)

机构地区：[1]苏州科技大学环境科学与工程学院,苏州215009

出　　处：《环境化学》2024年第8期2834-2844,共11页Environmental Chemistry

基　　金：江苏省普通高校研究生科研创新计划项目(KYCX18_2561)资助。

摘　　要：采用溶剂热合成法制备碳包覆铁酸锰中空磁性微球(CHM-MnFe_(2)O_(4)),通过SEM、TEM、XRD、VSM、FTIR、BET/BJH、XPS方法对其表观形貌进行分析,并将其应用于活化过硫酸盐(PMS)降解水中的甲氧苄啶(TMP),以高效液相色谱法对TMP的降解效率进行评估.经条件优化得出,在pH=7.0、PMS浓度为1.0 mmol·L^(−1)的条件下,投加0.10 g·L^(−1)的CHM-MnFe_(2)O_(4)纳米材料可在60 min内完全降解10.0 mg·L^(−1)的TMP.考察了无机阴离子和腐殖酸对TMP降解过程的影响:Cl−对TMP的降解具有双重作用,低浓度抑制高浓度促进;HCO_(3)−、HPO_(4)^(2−)和腐殖酸(HA)均具有一定抑制作用.通过自由基猝灭实验发现降解体系受到自由基·OH、SO_(4)^(−)·和非自由基1O_(2)的影响.循环实验和金属溶出实验证明CHM-MnFe_(2)O_(4)纳米材料具有良好的循环利用性能.The carbon-coated manganese ferrite hollow magnetic microspheres(CHM-MnFe2O4)were prepared by the solvothermal method and its morphology was characterized by SEM,TEM,XRD,VSM,FTIR,BET/BJH and XPS.The CHM-MnFe2O4 was applied to the degradation of trimethoprim(TMP)in water via activating peroxymonosulfate(PMS),and the degradation efficiency was evaluated by high performance liquid chromatography.The catalytic parameters were optimized and the TMP solution of 10.0 mg·L^(−1)(pH=7.0)could be completely removed within 60 minutes under the optimum concentration of 1.0 mmol·L^(−1)and 0.10 g·L^(−1)for PMS and CHMMnFe_(2)O_(4),respectively.The effect of inorganic anions and humic acid(HA)on the degradation efficiency of TMP was explored.The influence of chloride was bidirectional:the degradation efficiency of TMP was inhibited at low concentration while an acceleration was observed at high concentration.The degradation of TMP was inhibited by HCO_(3)−,HPO_(4)^(2−)and HA.The degradation system was found to be affected by free radicals of·OH,SO_(4)^(−)·and non-free radicals of 1O_(2)through the radical quenching experiment.A satisfactory recycling performance of CHM-MnFe_(2)O_(4)was verified by the cyclic experiments and metal dissolution experiments.

关 键 词：碳包覆中空磁性微球 甲氧苄啶 过硫酸盐 降解. 

分 类 号：X-1[环境科学与工程] O6[理学—化学]