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50 mg·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SO_(4)^(2-)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(SO_(4)^(·-))和单线态氧(^(1)O_(2))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^(+)/Cu^(2+)循环是活化PMS的主要成分.
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 SO_(4)^(2-)exhibited no significant impact.Quenching experiments and electron paramagnetic resonance(EPR)results indicated that sulfate radicals(SO_(4)^(·-))and singlet oxygen(^(1)O_(2))were the main reactive oxygen species(ROS)in the Co-Cu/PMS system.The XPS peak results indicated that the Cu^(+)/Cu^(2+)cycle played an important role in the PMS activation of the Co-Cu.
作者
彭建彪
常宇
吴佳琪
郭欣婷
司宁
马霖轩
刘海津
曹治国
高士祥
PENG Jianbiao;CHANG Yu;WU Jiaqi;GUO Xinting;SI Ning;MA Linxuan;LIU Haijin;CAO Zhiguo;GAO Shixiang(School of Environment,Henan Normal University,Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control,Ministry of Education,Xinxiang,453007,China;College of International Education,Henan Normal University,Xinxiang,453007,China;School of the Environment,Nanjing University,State Key Laboratory of Pollution Control and Resource Reuse,Nanjing,210023,China)
出处
《环境化学》
CAS
CSCD
北大核心
2024年第2期642-649,共8页
Environmental Chemistry
基金
国家自然科学基金(42122057,41977308)
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)和河南师范大学大学生创新训练项目(20220093)资助。
