钒酸铋基复合光催化剂的制备及性能研究  

Synthesis and properties of the BiVO_4 based composite photocatalysts

作　　者：刘景景 Liu Jingjing(College of Vanadium and Titanium,Panzhihua University,Panzhihua 617000,Sichuan,China;Sichuan Province Engineering Technology Research Center of Vanadium and Titanium Materials,Panzhihua 617000,Sichuan,China)

机构地区：[1]攀枝花学院钒钛学院,四川攀枝花617000 [2]四川省钒钛材料工程技术研究中心,四川攀枝花617000

出　　处：《钢铁钒钛》2024年第2期72-78,124,共8页Iron Steel Vanadium Titanium

基　　金：四川省钒钛材料工程技术研究中心开放项目(2021-FTGC-YB-14)。

摘　　要：以硝酸铋、偏钒酸铵、氯化钾和硅藻土为原料,采用液相沉淀法原位制备了二元BiOCl/BiVO_(4)以及三元BiOCl/BiVO_(4)/硅藻土光催化剂,对复合材料进行了物相结构和光催化性能表征。结果表明,二元BiOCl/BiVO_(4)为单斜BiVO_(4)和BiOCl混合相,三元BiOCl/BiVO_(4)/硅藻土为单斜BiVO_(4)、BiOCl和SiO_(2)混合相,升高煅烧温度能够促使BiVO_(4)转化为BiOCl。两种复合材料对罗丹明B的光降解率均比纯相BiVO_(4)有较大幅度的提升,样品煅烧温度为450℃时性能最佳。BiOCl/BiVO_(4)在1.5 h时的光降解率为99.05%,BiOCl/BiVO_(4)/硅藻土在2.5 h时的光降解率为100%,分别是相同条件下纯相BiVO_(4)的3.05和2.68倍。复合材料光催化活性提高可归因于BiOCl与BiVO_(4)之间形成的p-n异质结以及BiOCl特殊的层状结构,提升了材料对罗丹明B的吸附性能,有效抑制了电子-空穴对的复合,加速了载流子的分离和传输,在环境净化方面具有潜在的应用前景。Binary BiOCl/BiVO_(4)and ternary BiOCl/BiVO_(4)/diatomite photocatalysts were in situ prepared by liquid phase precipitation using bismuth nitrate,ammonium metadadate,potassium chloride and diatomite as raw materials,and the phase structure and photocatalytic properties of the composites were characterized.The results show that BiOCl/BiVO_(4)consists of monoclinic BiVO_(4)and BiOCl,and BiOCl/BiVO_(4)/diatomite consists of monoclinic BiVO_(4),BiOCl and SiO_(2).The increase of the calcination temperature can promote the conversion of BiVO_(4)into BiOCl.Compared with BiVO_(4),the photodegradation efficiencies of the composites are enhanced significantly,and the optimum calcination temperature is 450℃.The photodegradation efficiencies of BiOCl/BiVO_(4)at 1.5 h and BiOCl/BiVO_(4)/diatomite at 2.5 h are 99.05%and 100%,which is 3.05 and 2.68 times that of the BiVO_(4)under the same conditions,respectively,indicating that the introduction of BiOCl or BiOCl/diatomite into BiVO_(4)can effectively improve the photocatalytic activity.The enhanced photocatalytic activity of the composites can be ascribed to the p-n heterojunction formed between BiOCl and BiVO_(4)and the special layered structure of BiOCl,which improve the adsorption performance for rhodamine B,effectively inhibit the electron-hole pairs recombination,and accelerate the separation and transfer of charge carriers,leading to potential application prospects in the environmental purification.

关 键 词：BIVO4 BiOCl 硅藻土 复合光催化剂 液相沉淀 降解率 

分 类 号：TF841.3[冶金工程—有色金属冶金] TQ426[化学工程]