摘要
铁基-有机框架材料(MIL-53)具有稳定性强、催化效率高且环境友好等优点。该文以典型抗生素-四环素(TC)为目标污染物,实验研究了可见光(Vis)条件下MIL-53对过一硫酸盐(PMS)的催化活化性能,以及MIL-53的合成时间和温度、材料投加量、溶液初始pH等因素对TC催化降解的影响。结果显示,以MIL-53为光催化剂,PMS为氧化剂和电子受体,Vis为激发光源建立的光催化降解体系(MIL-53/PMS/Vis),能高效降解TC;MIL-53的合成条件对TC的降解具有一定影响,温度过低(>120℃)或过高(<150℃),合成时间过短(>12 h)时,会导致TC的降解不够彻底,而合成温度为150℃,时间>24 h时,TC的降解将更彻底(>95%)。MIL-53的最佳投加量为0.2 g/L;初始pH对TC的降解影响较小,在pH为3~9范围内TC的降解率均能达到95%以上。MIL-53/PMS/Vis有机物催化降解体系不仅绿色环保,pH适用范围广,而且降解效率高,具有广阔的应用前景。
The iron-based metal-organic framework material(MIL-53)has the advantages of strong stability,high catalytic efficiency and environmental friendliness.In this paper,with typical antibiotic-tetracycline(TC)as the target pollutant,the catalytic performance of MIL-53 on persulfate(PMS)under visible light(Vis)was studied,and the influence of the synthetic time and temperature of MIL-53,and the dosage of materials and the initial pH of the solution on the catalytic degradation of TC were investigated.The results showed that the photocatalytic degradation system(MIL-53/PMS/Vis)established with MIL-53 as photocatalyst,PMS as oxidant and electron acceptor,and Vis as excitation light source can effectively degrade TC and the degradation rate is up to more than 95%;the synthesis conditions of MIL-53 degraded TC had a certain effect,manifested as lower temperature(>120℃)or higher(<150℃),when the synthesis time is too short(>12 h),it will lead to insufficient degradation of TC,and the synthesis temperature is 150℃,when the time is greater than 24 h,the degradation of TC will be more thorough(>95%).The optimal dosage of MIL-53 is 0.2 g/L;the initial pH has little effect on the degradation of TC,and the degradation rate of TC can reach more than 95%in the pH range of 3~9.The degradation of TC by MIL-53/PMS/Vis system not only has a wide range of pH applications,but also metal iron(Fe)is more environmentally friendly.Optimizing the preparation conditions of MIL-53 can improve the degradation rate of TC and is beneficial to the actual removal of TC.
作者
张健宇
苏春利
秦怡
赵钰
刘鹏
ZHANG Jianyu;SU Chunli;QIN Yi;ZHAO Yu;LIU Peng(College of Environment,China University of Geosciences,Wuhan 430074,China;Dushi Environment Engineering Technology Co.Ltd.,Wuhan 430074,China;Sanchuandeqing Science&Technology Co.Ltd.,Wuhan 430074,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2021年第7期173-179,共7页
Environmental Science & Technology
基金
水污染防治重大科技专项:白洋淀与大清河流域(雄安新区)水生态环境整治与水安全保障关键技术研究与示范项目(2018ZX07110)
课题5:唐河污水库及雄安新区典型纳污坑塘地下水防控技术研究及工程示范(2018ZX07110005)
