NaF浸泡处理对BiOBr光催化降解有机染料罗丹明B的影响

发布时间：2018-06-06 18:06

  本文选题：溴氧化铋 + 氟化处理　； 参考：《分子催化》2017年02期

【摘要】：以五水硝酸铋(Bi(NO_3)_3·5H_2O)和溴代十六烷基吡啶(CPB)为原料,通过水热法合成溴氧化铋(BiOBr)光催化剂,并在pH=3.3的条件下分别用0.01 mol/L、0.1 mol/L、0.3 mol/L NaF溶液对其进行浸泡氟化处理得新催化剂BiOBr-F_(0.01)、BiOBr-F_(0.1)和BiOBr-F_(0.3).运用XRD(X-射线衍射)、SEM(扫描电镜)、UV-Vis DRS(紫外-可见漫反射光谱)、XPS(X-射线光电子能谱)、FL(荧光光谱)等技术对催化剂的物理结构及性质进行表征并研究了其在可见光(λ≥420 nm)下对有机染料罗丹明B(Rhodamine B,RhB)的催化降解活性.结果表明,随着NaF浓度增加,催化剂的结构及性质均发生一定程度的改变.氟化使得BiOBr对RhB的矿化能力减弱;但BiOBr-F_(0.1)使RhB褪色加快.RhB在降解过程中涉及到超氧自由基(O_2~(·-))、羟基自由基(·OH)及空穴(h~+)氧化,矿化率减小归因于活性物种产量降低,BiOBr-F_(0.1)使褪色加速则是加快了RhB的脱烷基过程,使最大吸收峰快速蓝移.
[Abstract]:Bismuth oxide (BiOBr-BiOBr-O) photocatalysts were synthesized by hydrothermal method from BiNOSTH _ 3H _ 2O and CPB). The new catalysts BiOBr-FO _ (0.1) mol / L ~ (0.1) mol / L ~ (0.3) mol / L NAF solution were soaked in 0.01 mol / L ~ (0.1) mol 路L ~ (-1) 路L ~ (-1) / L NAF solution to obtain new catalysts, BiOBr-F _ (0.01) and BiOBr-F _ (0.1) and BiOBr-F _ (0. 3) respectively. The physical structure and properties of the catalyst were characterized by means of XRDX ray diffraction (SEM) UV-Vis DRS (UV-Vis DRS) and the visible light (位 鈮，

本文编号：1987638