三维树枝状C/PbWO_4催化剂的制备及其对不同染料的光催化降解性能  

Three-Dimensional Dendritic C/PbWO_4 Catalysts: Preparation and Photocatalytic Performance in Degrading Different Dyes

作　　者：白羽 曾德彬 刘仁月 李韶雨 杨凯 黄微雅 余长林 BAI Yu;ZENG De-Bin;LIU Ren-Yue;LI Shao-Yu;YANG Kai;HUANG Wei-Ya;YU Chang-Lin(School of Metallurgy and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China;State Key Laboratory of Photocatalysis on Energy and Environment,Fuzhou University,Fuzhou 350002,China)

机构地区：[1]江西理工大学冶金与化学工程学院,赣州341000 [2]福州大学能源与环境光催化国家重点实验室,福州350002

出　　处：《无机化学学报》2018年第4期669-675,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21567008,21707055,21607064),江西理工大学清江拔尖人才支持计划,江西省5511科技创新人才计划(No.20165BCB18014),江西省主要学科学术带头人(No.20172BCB22018),江西省自然科学基金(No.20161BAB203090)和江西理工大学研究生创新基金(No.YC2016-S305)资助项目。

摘　　要：采用水热法合成了一种高结晶度的3D树枝状C/PbWO_4复合光催化剂(其中碳的质量分数分别为0.13%、0.26%、0.52%、0.78%)。应用X射线衍射、N2物理吸附、扫描电子显微镜、透射电子显微镜、能量色散X射线光谱、紫外可见漫反射光谱、光致发光光谱和光电流响应等手段对合成样品进行了表征。研究结果表明,当C的复合量为0.52%时,催化剂在降解偶氮染料酸性橙Ⅱ、甲基橙和罗丹明B呈现出最高的光催化活性,在光照100 min内对20 mg·L-1酸性橙Ⅱ的降解率达到97%,为纯Pb WO4的2.48倍。C/PbWO_4复合光催化剂活性提高的主要原因是掺杂在催化剂表面的C成为了电子俘获中心,有效俘获光生电子,促进光生电子和空穴分离的显著效果,从而产生更多活性物种(·OH、h+)参与染料分子的降解,提升光催化活性。Three-dimensional dendritic C/PbWO4 composite photocatalyst with different C content(Mass fraction:0.13%,0.26%,0.52%,0.78%)was synthesized by a hydrothermal method.T he photocatalysts were characterized by X-ray diffraction,N2 sorption measurements,scanning electron microscopy,transmission electron microscopy,energy dispersive X-ray spectroscopy,ultraviolet-visible diffuse reflectance spectroscopies,photoluminescence,and photoelectrochemical measurement.The results showed that the dendritic C/Pb WO4 composite photocatalyst with 0.52%C exhibits the best photocatalytic performance in degrading orange II,methyl orange and rhodamine B.Under the light irradiation for 100 min,the degradation rate of the acid orangeⅡ(20 mg·L-1)over 0.52%C/PbWO4 reached 97%which was about 2.48 times as that of bare PbWO4.The main reason for the increase of activity is that carbon attached to the surface of the catalyst becomes the electron trapping center,and it can effectively capture the photogenerated electrons.Therefore,the photo-generated electron-hole pairs were effectively separated to produce more active species(·OH,h+)to participate in the degradation of organic dye molecules.

关 键 词：树枝状 PBWO4 碳掺杂 有机染料 复合光催化剂 

分 类 号：O643.3[理学—物理化学]