摘要
太阳光中有一多半是红外光,而利用红外光的光催化反应却鲜有报道。本研究制备了一种全光谱响应的W_(18)O_(49)/g-C_(3)N_(4)异质结催化剂,并考察了催化剂光降解罗丹明B(RhB)的性能。采用X射线衍射(XRD)、氮气吸附、紫外-可见-近红外(UV-Vis-NIR)光谱、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、荧光光谱(PL)、X射线光电子能谱(XPS)和电化学阻抗谱(EIS)等手段对催化剂进行了表征。结果显示制备的催化剂对250~1800 nm范围内的光均显示出较强的吸收。制备的异质结催化剂对RhB的降解速率常数达到0.0159 min-1,分别是纯g-C3N4和W18O49的5.3倍、11.4倍,且具有优异的催化稳定性。W18O49一方面作为红外光吸收材料,提高了催化剂对光的吸收利用,另一方面与g-C3N4组成异质结催化剂,显著提高了光生电荷分离效率。此外,本研究还考察了W_(18)O_(49)/g-C_(3)N_(4)异质结催化剂降解RhB可能的反应机理。
More than half of the solar spectrum is near infrared(NIR)light.However,the report concerning the photocatalytic reaction using NIR light is rare.In this work,a full-spectrum-driven W_(18)O_(49)/g-C_(3)N_(4) heterojunction catalyst was prepared and the photocatalytic RhB degradation ability was investigated.X-ray diffraction,N2 adsorption,UV-Vis-NIR spectroscopy,scanning electron microscope,transmission electron microscope,photoluminescence,X-ray photoelectron spectroscope and electrochemical impedance spectra were used to characterize the prepared catalysts.The result indicates that as-prepared W_(18)O_(49)/g-C_(3)N_(4) heterojunction catalysts display strong light absorption in the region of 250—1800 nm.The reaction rate constant for W_(18)O_(49)/g-C_(3)N_(4) heterojunction catalyst arrives 0.0159 min-1,which is 5.3 times and 11.4 times higher than that of neat g-C_(3)N_(4) and W_(18)O_(49),as well as excellent catalytic stability.In addition,the mechanism of degradation of RhB by W_(18)O_(49)/g-C_(3)N_(4) heterojunction catalyst was investigated.
作者
胡绍争
王菲
李政
马宏飞
李萍
HU Shaozheng;WANG Fei;LI Zheng;MA Hongfei;LI Ping(College of Chemistry,Chemical Engineering,and Environmental Engineering,Liaoning Shihua University,Fushun 113001,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第8期11-16,共6页
Materials Reports
基金
国家自然科学基金(41571464)
辽宁省教育厅项目(L2014145)。
