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
孙彬 1徐佳敏 1高仕谦 1张占恩1
作者信息
- 1. 苏州科技大学环境科学与工程学院,苏州,215009
- 折叠
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-MnFe2O4),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1.0mmol·L-1的条件下,投加0.10 g·L-1的CHM-MnFe2O4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;HCO3-、HPO42-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、SO4-·和非自由基1O2的影响.循环实验和金属溶出实验证明CHM-MnFe2O4纳米材料具有良好的循环利用性能.
Abstract
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-1and 0.10 g·L-1 for PMS and CHM-MnFe2O4,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 HCO3,HPO42-and HA.The degradation system was found to be affected by free radicals of·OH,SO4-and non-free radicals of 1O2 through the radical quenching experiment.A satisfactory recycling performance of CHM-MnFe2O4 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Key words
carbon-coated hollow magnetic microspheres/trimethoprim/persulfate/degradation引用本文复制引用
基金项目
江苏省普通高校研究生科研创新计划项目(KYCX18_2561)
出版年
2024
NETL
NSTL
万方数据