顾傲天,谭伟洋,李智颖,付 豪,王 鹏,龚春慧,杨 毅
(南京理工大学 环境与生物工程学院;江苏省化工污染控制与资源化重点实验室,江苏 南京 210094)
DOI:10.13732/j.issn.1008-5548.2022.01.002
收稿日期: 2021-05-25,修回日期:2021-06-23,在线出版时间:2021-11-16。
基金项目:国家自然科学基金项目,编号:51908240;中央高校基本科研业务费专项资金项目,编号:30921013110;江苏省研究生科研与实践创新计划项目,编号:KYCX20_0332,SJCX20_0114;江苏省凹土资源利用重点实验室开放课题项目:编号 HPK202001。
第一作者简介:顾傲天(1995—),男,博士研究生,研究方向为环境功能材料。E-mail:490188489@qq.com。
通信作者简介:杨毅(1973—),男,研究员,博士,博士生导师,研究方向为环境功能材料。E-mail:yangyi@njust.edu.cn。
摘要:采用双溶剂法制备Ag-ZIF-8(Zn-Co)多金属MOFs材料,并将其用于对硝基苯酚、邻硝基苯酚和对硝基苯胺等污染物的催化还原;利用扫描电子显微镜(SEM)、 X射线衍射仪(XRD)、透射电镜(TEM)对制备的材料进行表征。结果表明:Ag-ZIF-8(Zn-Co)在催化降解3种污染物方面表现出优异的催化活性;Ag-ZIF-8(Zn-Co)催化降解对硝基苯酚反应的表观速率常数和转换频率分别为1.080×10-4 s-1和2.056 min-1,并在多次重复使用过程中保持较高的催化性能;与单金属复合材料Ag-ZIF-8和Ag-ZIF-67相比,Ag-ZIF-8 (Zn-Co)的催化活性显着提高,主要原因是Ag-ZIF-8(Zn-Co)具有高比表面积,Zn和Co双金属的协同作用,以及孔道对银纳米颗粒的限制等。
关键词:双溶剂法;沸石咪唑酯骨架;硝基苯酚;金属有机骨架;高效催化
Abstract:Ag-ZIF-8(Zn-CO) multi metal MOFs was prepared by double-solvent method and applied to the catalytic reduction pollutants of p-nitrophenol, o-nitrophenol and p-nitroaniline. The obtained samples were fully characterized by scanning electron microscope(SEM), X-ray diffractometer(XRD) and transmission electron microscope(TEM). The results show that Ag-ZIF-8(Zn-Co) shows excellent catalytic activity in the catalytic degradation of three pollutants. The apparent rate constant and conversion frequency of Ag-ZIF-8(Zn-Co) catalytic degradation of p-nitrophenol are 1.080×10-3 s-1 and 2.056 min-1, respectively, and high catalytic performance is maintained during repeated use. Compared with Ag-ZIF-8 and Ag-ZIF-67, the catalytic activity of Ag-ZIF-8(Zn-Co) is significantly improved, which is mainly due to the high specific surface area of Ag-ZIF-8(Zn-Co), Zn and Co bimetallic synergy, and encapsulation of silver nanoparticles by pores.
Keywords:double-solvent method; zeolitic imidazolate framework; nitrophenol; metal organic framework; efficient catalysis
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