二维Ni-MOF用于高选择性光催化CO_(2)还原产CH_(4)  

Selective photocatalytic CO_(2)reduction to CH_(4)by two-dimensional Ni-MOF

作　　者：商虹 王怡轩 郝温昕 郝昕萌 刘煊赫 SHANG Hong;WANG Yixuan;HAO Wenxin;HAO Xinmeng;LIU Xuanhe(School of Science,China University of Geosciences,Beijing 100083,China)

机构地区：[1]中国地质大学(北京)数理学院,北京100083

出　　处：《山东科技大学学报（自然科学版）》2024年第5期90-96,共7页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(22001240);中国地质大学(北京)2024年度研究生教育教学改革专项;中国地质大学(北京)2023年度本科教育质量提升建设项目。

摘　　要：利用太阳能将CO_(2)转化为CH_(4),能够同时缓解能源危机及温室效应。本研究以对苯二甲酸(H_(2)BDC)和铜盐或镍盐为原料,利用超声法合成了两种二维金属有机骨架材料(MOF)Cu-BDC和Ni-BDC,通过X射线衍射、X射线光电子能谱、电镜等对其结构组成和形貌进行了表征,并进行了紫外可见漫反射光谱、阻抗、光电流响应等光电性能测试。在模拟太阳光下,Ni-BDC光催化CO_(2)还原CH_(4)产率高达95.22μmol·g^(-1)·h^(-1),选择性为75%,并表现出良好的稳定性,这归因于n型半导体Ni-BDC具有更负的导带位置,能够产生更高的光生电荷效率。结果表明:金属活性中心的选择能够有效调控MOF的光催化性能。Converting CO_(2)into CH_(4)by solar energy can relieve energy crisis and greenhouse effect.In this study,two-dimensional(2D)metal organic frameworks(MOF),Cu-BDC(BDC=1,4-benzenedicarboxylate)and Ni-BDC were successfully prepared by the reaction of terephthalic acid(H_(2) BDC)and cuprum(Cu)or nickel(Ni)salt through ultrasonic treatment.The structure and the morphology were well represented by X-ray diffraction,X-ray photoelectron spectroscopy and electron microscopes.The photoelectric properties were investigated by UV-visible diffuse reflectance spectrum,impedance,and photocurrent response.Under simulated sunlight,Ni-BDC could be used as photocatalyst for CO_(2)to CH_(4)conversion,showing excellent efficiency with a CH_(4)production rate as high as 95.22μmol·g^(-1)·h^(-1),a selectivity of 75%,and perfect stability,which was superior to Cu-BDC.This was attributed to the more negative conduction band position for n-type semiconductor Ni-BDC,which was beneficial to improve the efficiency of photo-generated electrons.The results show that the selection of metal active centers can effectively regulate the photocatalytic performance of MOF.

关 键 词：金属有机骨架 光催化 CO_(2)还原 CH_(4) 

分 类 号：O64[理学—物理化学]