工业水处理 ›› 2022, Vol. 42 ›› Issue (7): 59-66. doi: 10.19965/j.cnki.iwt.2021-0937

• 试验研究 • 上一篇    下一篇

可见光驱动g-C3N4/NH2-MIL-101(Fe)活化PDS降解RhB

周书葵(), 高聪, 段毅(), 刘迎九, 吴姣, 田瑞   

  1. 南华大学土木工程学院,湖南 衡阳 421001
  • 收稿日期:2022-03-15 出版日期:2022-07-20 发布日期:2022-09-05
  • 作者简介:

    周书葵(1965— ),教授。E-mail:

    段毅,博士,工程师。E-mail:

  • 基金资助:
    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)

Degradation of Rhodamine B by visible light driven g-C3N4/NH2-MIL-101(Fe) activated persulfate

Shukui ZHOU(), Cong GAO, Yi DUAN(), Yingjiu LIU, Jiao WU, Rui TIAN   

  1. School of Civil Engineering,University of South China,Hengyang 421001,China
  • Received:2022-03-15 Online:2022-07-20 Published:2022-09-05

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-C3N4/NH2-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-C3N4/NH2-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%;HCO3 -、H2PO4 -、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-C3N4/NH2-MIL-101(Fe)/PDS/Vis对RhB的去除率仍达到90%以上,表明g-C3N4/NH2-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SO4 ·-,其作用大小为h+>·OH>SO4 ·-

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

Abstract:

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-C3N4/NH2-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-C3N4/NH2-MIL-101(Fe) had complete crystal structure,rough surface and regular octahedral structure. Under irradiation of visible light and the conditions of photocatalyst 0.2 g/L,PDS 8 mmol/L,initial pH 3,temperature 30 ℃,when the reaction time was 50 min,the removal rate of RhB reached 99%. HCO3 -,H2PO4 - 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-C3N4/NH2-MIL-101(Fe)/PDS/Vis was still up to 90%,which meant g-C3N4/NH2-MIL-101(Fe) had great stability. In addition,a free radical quenching test showed that the main active species with catalytic degradation effect of RhB included h+,·OH and SO4 ·-,their action size was h+>·OH>SO4 ·-.

Key words: mental-organic frameworks, persulfate, visible-light photocatalysis, Rhodamine B

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