摘要
以Bi(NO_3)_3·5H_2O和KBr为原料,采用水热合成法制备了BiOBr光催化剂.然后将制备好的BiOBr运用低温等离子体技术处理制备了Pd/BiOBr光催化剂.运用N_2-物理吸附脱附、X射线粉末衍射(XRD)、扫描电镜(SEM)对催化剂的结构和晶型进行了表征,利用光致发光(PL)谱、紫外可见漫反射吸收光谱(Uv-Vis DRS)技术和瞬时光电流谱对催化剂的光电特性进行了测定.并以染料罗丹明B(Rhodamine B,RhB)及无色小分子2,4-二氯苯酚(2,4-Dichlorophenol,2,4-DCP)为底物,在可见光(λ≥420nm)条件下考察了Pd/BiOBr的光催化降解性能,结果表明Pd/BiOBr催化剂较纯BiOBr光催化效果显著提升,在反应11h时对RhB矿化率达到70%.同时分析了BiOBr和Pd/BiOBr对RhB光催化降解过程中活性物种,表明BiOBr在降解过程中主要涉及O_2·^-氧化,Pd/BiOBr对RhB光催化降解过程中超氧和空穴同时起作用.
Novel noble metal Pd/BiOBr composite photocatalysts were prepared and well characterized by nitrogen physical adsorption, powder X ray diffraction（XRD）, scanning electron microscopy（SEM）, Photolu minescence（PI.） emission spectroscopy, UV vis diffuse reflectance spectra（DRS） and Transient photocurrent. Photocatalytic performance of BiOBr treated by Pd plasma in degradation of RhB and 2,4-DCP. The results and the role of plasmon photocatalysis caused by deposited noble metal nanoparticles. The trapping experi ments of radicals indicated that hole was the main reactive species for the photocatalytic degradation of RhB. Superoxide radical is the dominant active species for the photocatalytic degradation of RhB by BiOBr. Hole scavengers（h ） and superoxide radicals（O2^-） are the dominant active species for the photocatalytic degradation of RhB by Pd/BiOBr.
作者
李灵
焦磊
姚坤
黄应平
贾漫珂
Li Ling;Jiao Lei;Yao Kun;Huang Yingping;Jia Manke(College of Biology and Pharmacy,China Three 443002,China;China Engineering Research Center of Ministry of Education,China Three Gorges Univ.,vation Center for Geo Hazards ＆ Eco Environment Yichang,443002,China）Gorges Univ.,China Three Gorges Univ.,Yichang of Eco environment in Three Gorges Reservoir Region Yichang 443002,China;Hubei Collaborative Innovation Center of Geo-Hazards ＆ Eco-Environment in Three Gorges Area,China Three Gorges Univ.,Yichang,443002,China)
出处
《三峡大学学报（自然科学版）》
CAS
北大核心
2018年第5期97-102,共6页
Journal of China Three Gorges University：Natural Sciences
基金
国家自然科学基金(21577078
21677086
21377067)
科技惠民计划项目(No:S2013GMD100042)
湖北省创新群体滚动项目(No:2015CFA021)
国家水专项(2012ZX07104-003-04)
