夹心型磷钨酸盐光催化降解甲基橙  

Photocatalytic degradation of methyl orange by sandwich-type phosphotungstates

作　　者：黄梅丽 陆爽 王晓红[1] 段莉梅[1] 刘宗瑞[1] 许良[1,2] 王斌 HUANG Mei-li;LU Shuang;WANG Xiao-hong;DUAN Li-mei;LIU Zong-rui;XU Liang;WANG Bin(College of Chemistry and Materials Science,Inner Mongolia Minzu University,Tongliao 028043,China;Key Laboratory of the Natural Products Chemistry and Functional Molecular Synthesis of Autonomous Region,Tongliao 028000,China)

机构地区：[1]内蒙古民族大学化学与材料学院,内蒙古通辽028043 [2]天然产物化学及功能分子合成自治区重点实验室,内蒙古通辽028000

出　　处：《化学研究与应用》2023年第8期1846-1853,共8页Chemical Research and Application

基　　金：国家自然科学基金项目(21501102)资助;内蒙古自治区自然科学基金项目(2019MS02002)资助;内蒙古自治区高等学校“青年科技英才支持计划”(NJYT-18-B22)资助;内蒙古自治区直属高校基本科研业务费项目(GXKY22049)资助。

摘　　要：光催化降解有机污染物具有降解效率高、矿化彻底等优点而备受关注,而组成丰富、结构多样的过渡金属夹心型磷钨酸盐光催化降解有机染料仍鲜有报道。本文通过水溶液合成法制备了一系列过渡金属二夹心磷钨酸盐Na_(2)M_(2)(PW_(9)O_(34))_(2)^(12-)(M=Mn^(2+),Co^(2+),Ni^(2+),Cu^(2+),Zn^(2+)),并利用粉末X射线衍射(P-XRD)、拉曼光谱(Raman)、红外光谱(IR)对夹心型磷钨酸盐的结构进行表征,利用紫外-可见光谱(UV-Vis)、循环伏安法(CVs)对夹心型磷钨酸盐的光、电活性进行研究。以甲基橙为光催化降解底物分子,考察不同过渡金属二夹心磷钨酸盐、催化剂用量、底物分子浓度对甲基橙光催化降解率的影响。五种过渡金属二夹心磷钨酸盐催化剂对甲基橙光催化降解活性顺序为:Na_(2)Co_(2)(PW_(9)O_(34))_(2)^(12-)>Na_(2)Zn(2)(PW_(9)O_(34))_(2)^(12-)>Na_(2)Ni_(2)(PW_(9)O_(34))_(2)^(12-)>Na_(2)Mn_(2)_(2)(PW_(9)O_(34))_(2)^(12-)>Na_(2)Cu_(2)(PW_(9)O_(34))_(2)^(12-)。Photocatalytic degradation of organic pollutants has attracted much attention due to its high degradation efficiency and thorough mineralization.However,the photocatalytic degradation of organic dyes by transition metal-containing sandwich-type phosphotungstates with rich composition and diverse structures is still rarely reported.In this article,a series of sandwich-type phosphotungstates containing two transition metal in the central belt:Na_(2)M_(2)(PW_(9)O_(34))_(2)^(12-)(M=Mn^(2+),Co^(2+),Ni^(2+),Cu^(2+),Zn^(2+))were prepared by the conventional aqueous synthesis method and structurely characterized by powder X-ray diffraction(P-XRD),Raman spectroscopy(Raman)and infrared spectroscopy(IR).The optical and electrical activities of the polyoxometalates were studied by UV visible spectroscopy(UV-Vis)and cyclic voltammetry(CVs).The influenece of diffferent sandwich-type phosphotungstates containing two transition metal,catalyst dosage,substrate molecular concentration on photocatalytic activity of methyl orange were investigated.The photodegradation activity of methyl orange with five different sandwich-type phosphotungstates containing two transition metal catalysts is in the order of Na_(2)Co_(2)(PW_(9)O_(34))_(2)^(12-)>Na_(2)Zn(2)(PW_(9)O_(34))_(2)^(12-)>Na_(2)Ni_(2)(PW_(9)O_(34))_(2)^(12-)>Na_(2)Mn_(2)_(2)(PW_(9)O_(34))_(2)^(12-)>Na_(2)Cu_(2)(PW_(9)O_(34))_(2)^(12-).

关 键 词：多金属氧酸盐 夹心型结构 光催化降解 有机染料 

分 类 号：O614.5[理学—无机化学]