可见光驱动g-C_(3)N_(4)/NH_(2)-MIL-101(Fe)活化PDS降解RhB  

Degradation of Rhodamine B by visible light driven g-C_(3)N_(4)/NH_(2)-MIL-101(Fe)activated persulfate

作　　者：周书葵 高聪 段毅 刘迎九 吴姣 田瑞 ZHOU Shukui;GAO Cong;DUAN Yi;LIU Yingjiu;WU Jiao;TIAN Rui(School of Civil Engineering,University of South China,Hengyang 421001,China)

机构地区：[1]南华大学土木工程学院,湖南衡阳421001

出　　处：《工业水处理》2022年第7期59-66,共8页Industrial Water Treatment

基　　金：国家自然科学基金项目(51174117);湖南省教育厅科研平台项目(15K106);湖南创新平台开放基金项目(17K078)。

摘　　要：金属有机框架化合物(MOFs)具有孔隙率高、比表面积大和化学性质稳定等优点,作为催化材料具有良好的发展前景。通过溶剂热法成功合成了g-C_(3)N_(4)/NH_(2)-MIL-101(Fe)复合光催化剂。采用X-射线衍射仪(XRD)、扫描电子显微镜(SEM)及X射线光电子能谱(XPS)对催化剂的结构和表面形貌进行分析,并研究其在可见光(Vis)照射下活化过二硫酸盐(PDS)降解水中罗丹明B(RhB)的效果及活化机制。结果显示:g-C_(3)N_(4)/NH_(2)-MIL-101(Fe)晶体结构完整、表面粗糙,并呈现出规则的正八面体结构;在可见光照射下,光催化剂投加量为0.2 g/L、PDS投加量为8 mmol/L、初始pH为3、温度为30℃时,反应50 min,RhB的去除率达到99%;HCO_(3)^(-)、H_(2)PO_(4)^(-)、Cl^(-)等阴离子能与活性基团反应,明显抑制体系对RhB的去除;3次循环后,g-C_(3)N_(4)/NH_(2)-MIL-101(Fe)/PDS/Vis对RhB的去除率仍达到90%以上,表明g-C_(3)N_(4)/NH_(2)-MIL-101(Fe)具有良好的稳定性。自由基猝灭实验表明,催化降解RhB的主要活性物种为h^(+)、·OH和SO_(4)·^(-),其作用大小为h^(+)>·OH>SO_(4)·^(-)。Metal-organic frameworks(MOFs)have the advantages of high porosity,large specific surface area and stable chemical properties,so they have a good development prospect as a kind of catalytic materials.In this study,the g-C_(3)N_(4)/NH_(2)-MIL-101(Fe)composite photocatalyst was synthesized by the solvothermal method.The structure and surface morphology of the catalyst were analyzed by X-ray diffraction(XRD),scanning electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS).And then its effect and activation mechanism on degradation of Rhodamine B(RhB)by activated persulfate(PDS)when exposed to visible light(Vis)were studied.The results showed that,g-C_(3)N_(4)/NH_(2)-MIL-101(Fe)had complete crystal structure,rough surface and regular octahedral struc⁃ture.Under irradiation of visible light and the conditions of photocatalyst 0.2 g/L,PDS 8 mmol/L,initial pH 3,tem⁃perature 30℃,when the reaction time was 50 min,the removal rate of RhB reached 99%.HCO_(3)^(-),H_(2)PO_(4)^(-)and Cl^(-)could react with active groups and significantly inhibited the removal of RhB in this system.After three cycles,the removal rate of RhB by g-C_(3)N_(4)/NH_(2)-MIL-101(Fe)/PDS/Vis was still up to 90%,which meant g-C_(3)N_(4)/NH_(2)-MIL-101(Fe)had great stability.In addition,a free radical quenching test showed that the main active species with cata⁃lytic degradation effect of RhB included h^(+),·OH and SO_(4)·^(-),their action size was h^(+)>·OH>SO_(4)·^(-).

关 键 词：金属-有机框架化合物 过二硫酸盐 可见光光催化 罗丹明B 

分 类 号：X703.1[环境科学与工程—环境工程]