摘要
采用高温固相反应法制备了一系列镝离子掺杂BiZnBO(BZBO)光催化剂。通过XRD、TEM和HRTEM等手段对BZBO:xDy^(3+)材料的结构及形貌等进行了表征,通过Rh B溶液在紫外灯下的光降解实验研究了不同浓度镝离子掺杂对BZBO光催化性能的影响。Rh B光降解实验结果表明,当Dy^(3+)在BZBO中的掺杂量为4%时,BZBO:4%Dy^(3+)具有最好的光降解活性,其光降解活性为纯BZBO的1.56倍。通过光吸收性能分析可知,Dy^(3+)的引入增强了BZBO的紫外吸收强度,并稍降低了其禁带宽度。光吸收性能、光致发光光谱、光电流和EIS实验结果表明,BZBO:4%Dy^(3+)的光催化活性增强的主要原因是BZBO中掺杂的镝不仅提高了BZBO光催化剂的光吸收能力,更促进了光生电子-空穴对的分离和转移。因此,在稀土元素和极化电场的作用下,BZBO:4%Dy^(3+)的光催化活性要高于其他所制备的样品。
A series of dysprosium doped BiZn BO(BZBO) photocatalysts were prepared by high temperature solid-state reaction.The crystal structure and morphology of BZBO:x Dy^(3+)were detected by XRD,TEM and HRTEM.Effects of dysprosium doping with different concentration on their photocatalytic performance were investigated by degradation of Rh B under UV light irradiation.The Rh B photodegradation results revealed that the optimum photodegradation activity of Dy^(3+)doped BZBO (BZBO:4%Dy^(3+)) was1.56 times higher than pure BZBO.The results of optical absorption indicated that the introduction of Dy^(3+)in BZBO could enhance absorption intensity in UV region and reduced forbidden band width of BZBO.The optical absorption,photoluminescence spectra,photocurrent and EIS experimental results demonstrated that the enhanced photocatalytic activity of BZBO:4%Dy^(3+)was mainly ascribed to that the doped dysprosium in BZBO could promote the separation and transfer of photogenerated electron-hole pairs and improve photoabsorption ability of BZBO photocatalyst.Thus,BZBO:4%Dy^(3+)exhibited the highest photocatalytic activity than that of other as-prepared samples under the effects of both rare earth elements and polarization electric field.
作者
赵文武
周海静
黄雁
王秀文
郝斌
刘剑
ZHAO Wenwu;ZHOU Haijing;HUANG Yan;WANG Xiuwen;HAO Bin;LIU Jian(School of New Materials and Chemical Engineering,Tangshan University,Tangshan 063000,Hebei,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2022年第11期5843-5849,共7页
Chemical Industry and Engineering Progress
基金
河北省高等学校科学技术研究项目(QN2020521)
唐山市科技计划(21130235C)。
