摘要
研究了采用水热法制备g-C_(3)N_(4)/Bi_(2)WO_(6)复合光催化剂,并探究了其在可见光下催化还原Cr(Ⅵ)的性能及机制。结果表明:g-C_(3)N_(4)/Bi_(2)WO_(6)为纳米片堆积成的花瓣状结构,比表面积比g-C_(3)N_(4)和Bi_(2)WO_(6)更大,可为光催化反应提供更多活性位点;在40 min黑暗条件下,g-C_(3)N_(4)/Bi_(2)WO_(6)对Cr(Ⅵ)的吸附率为43.2%,其吸附行为符合准二级动力学模型;可见光照射100 min后,g-C_(3)N_(4)/Bi_(2)WO_(6)对Cr(Ⅵ)的光催化还原率为81.3%,其光催化还原过程符合准一级动力学模型;g-C_(3)N_(4)与Bi_(2)WO_(6)复合后形成了Z型异质结,拓宽了其光吸收范围,促进了光生电子-空穴的分离,从而显示出优异的可见光催化活性。
The g-C_(3)N_(4)/Bi_(2)WO_(6)composite photocatalyst was prepared by hydrothermal method,and its properties and mechanism for Cr(Ⅵ)reduction were studied under visible light.The results show that g-C_(3)N_(4)/Bi_(2)WO_(6)is a petaloid structure composed of nanosheets with larger surface area than the single g-C_(3)N_(4)and Bi_(2)WO_(6),which can provide more active sites for photocatalytic reaction.The adsorption efficiency of g-C_(3)N_(4)/Bi_(2)WO_(6)for Cr(Ⅵ)is 43.2%under 40 min dark condition,and the adsorption behavior is consistent with the quasi-second-order kinetic model.After 100 min of visible light irradiation,the photocatalytic reduction rate of g-C_(3)N_(4)/Bi_(2)WO_(6)for Cr(Ⅵ)is 81.3%,and the photocatalytic reduction process is consistent with the quasi-first-order kinetic model.After the combination of g-C_(3)N_(4)and Bi_(2)WO_(6),forms a Z-scheme heterojunction,which broadens the light absorption range and promots the separation of photogenerated electron-hole,thus showing excellent visible light catalytic activity.
作者
秦玉馨
查雨心
何新雨
史小舟
陈琳
陈国壮
马越
马丙瑞
李金成
QIN Yuxin;ZHA Yuxin;HE Xinyu;SHI Xiaozhou;CHEN Lin;CHEN Guozhuang;MA Yue;MA Bingrui;LI Jincheng(School of Environmental and Municipal Engineering,Qingdao University of Technology,Qingdao 266520,China;Dezhou Zhanquan Water Supply Engineering Design Co.,Ltd.,Dezhou 253000,China;Qingdao Yinhuang Jiqing Water Co.,Ltd.,Qingdao 266000,China)
出处
《湿法冶金》
北大核心
2025年第1期100-110,共11页
Hydrometallurgy of China
