Co-Cu双金属氧化物活化过一硫酸盐去除水中磺胺甲噁唑
Enhanced removal of sulfamethoxazole via peroxymonosulfate activated by the Co-Cu bimetallic oxide
彭建彪 1常宇 1吴佳琪 2郭欣婷 1司宁 1马霖轩 2刘海津 1曹治国 1高士祥3
作者信息
- 1. 河南师范大学环境学院,黄淮水环境污染与防治教育部重点实验室,新乡,453007
- 2. 河南师范大学国际教育学院,新乡,453007
- 3. 南京大学环境学院,污染控制与资源化国家重点实验室,南京,210023
- 折叠
摘要
采用钴铜双金属氧化物(Co-Cu)为催化剂,活化过一硫酸盐(PMS)降解水中的磺胺甲噁唑(SMX).使用场发射扫描电镜(FESEM)、透射电镜(TEM)、X射线光电子能谱(XPS)、X射线衍射(XRD)对催化剂的形貌和元素组成进行表征.考察了催化剂和PMS浓度、无机阴离子和富里酸(FA)对Co-Cu/PMS体系降解SMX的影响.结果表明,当pH为7.0时,在催化剂用量为50mg·L-1,PMS浓度为0.5 mmol·L-1条件下,50 mg·L-1 的SMX在30 min内去除率为95.6％,增加PMS浓度或提高催化剂用量均可加快SMX的降解速率.水中FA与HCO3-对SMX的去除率有一定的抑制作用,而Cl-和SO42-对反应无影响.淬灭实验与电子顺磁共振(EPR)结果显示,硫酸根自由基(SO4-)和单线态氧(1O2)为Co-Cu/PMS体系中主要的活性氧物种(ROS).XPS分峰结果表明,在钴铜双反应活性中心中Cu+/Cu2+循 环是活化PMS的主要成分.
Abstract
Co-Cu bimetallic oxide was used as a catalyst for the activation of peroxymonosulfate(PMS)to degrade sulfamethoxazole(SMX)in water.The morphology and elemental composition of the as-prepared catalyst were characterized by field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),and X-ray diffraction(XRD).In the catalytic system,95.6％of SMX was removed within 30 min when the pH was 7.0,the catalyst dosage was 50 mg·L-1,and the PMS concentration was 0.5 mmol·L-1.The removal of SMX was accelerated with increasing PMS concentration and catalyst dosage.FA and HCO3-had an inhibitory effect on the removal of SMX,while Cl-and SO42-exhibited no significant impact.Quenching experiments and electron paramagnetic resonance(EPR)results indicated that sulfate radicals(SO4-)and singlet oxygen(1O2)were the main reactive oxygen species(ROS)in the Co-Cu/PMS system.The XPS peak results indicated that the Cu+/Cu2+cycle played an important role in the PMS activation of the Co-Cu.
关键词
Co-Cu/过一硫酸盐/磺胺甲噁唑/活性氧物种Key words
Co-Cu/peroxymonosulfate/sulfamethoxazole/ROS引用本文复制引用
基金项目
国家自然科学基金(42122057)
国家自然科学基金(41977308)
河南省自然科学基金(222300420205)
河南省国际科技合作项目(232102521013)
河南师范大学科研与实践创新项目(YX202307)
河南师范大学大学生创新训练项目(20220093)
出版年
2024
NETL
NSTL
万方数据