Co-Pi/BiVO_(4)的制备及对有机硫废水的催化光降解  

Preparation of Co-Pi/BiVO_(4) for light degradation of organic sulfur wastewater

作　　者：朱鹏宇 孙秀云[1] 王洁 白俊伟 朱开金 ZHU Peng-yu;SUN Xiu-yun;WANG Jie;BAI Jun-wei;ZHU Kai-jin(School of Environmental and Bioengineering,Nanjing University of Science and Technology,Nanjing 210094,China;Safety&Environmental Technology Research Institute of China Petroleum Group,Beijing 102206,China;Department of Environmental and Safety Engineering,Taiyuan Institute of Technology,Taiyuan 030008,China)

机构地区：[1]南京理工大学环境与生物工程学院,江苏南京210094 [2]中国石油集团安全环保技术研究院,北京102206 [3]太原工业学院环境与安全工程系,山西太原030008

出　　处：《高校化学工程学报》2023年第1期138-145,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：中国石油集团安全环保技术研究院国家重点实验室对外开放基金(PPC2020006)。

摘　　要：为有效降解高浓度乙硫醇工业废水,研究了性能良好的半导体复合光催化剂CoOx/BiVO_(4)与Co-Pi/BiVO_(4)。通过优化选择反应物Co(NO_(3))_(2)与BiVO_(4)物质的量比n(Co(NO_(3))_(2)):n(BiVO_(4))为1:3,并在磷酸盐中性缓冲溶液下通过电沉积方法制得稳定且性能优异的催化剂CoOx-Co(PO_(4))x/BiVO_(4)(记为Co-Pi/BiVO_(4))。通过对Co-Pi/BiVO_(4)及CoOx/BiVO_(4)在形貌、晶型、化学态和析氧及电阻抗等方面进行测试与比较,得到了Co-Pi/BiVO_(4)具有更强氧化性和更大稳定性的推论。在可见光响应下对Co-Pi/BiVO_(4)与CoOx/BiVO_(4)降解乙醇硫废水进行了对比,结果表明,同等条件下Co-Pi/BiVO_(4)对废水的化学需氧量去除率达到80%,脱硫率超过78%,比CoOx/BiVO_(4)分别提高了25%和14%。同时对CoOx-Co(PO_(4))x的形成和化学作用机制作了深入分析,对不同反应配比合成的Co-Pi/BiVO_(4)作用的动力学作了研究,构建了产生羟基自由基·OH的质子化途径和乙硫醇降解的历程。In order to effectively degrade industrial wastewater with high concentration of ethan ethiol,semiconductor supported photocatalyst CoOx/BiVO_(4)and Co-Pi/BiVO_(4)was used in this study.A stable catalyst CoOx-Co(PO_(4))x/BiVO_(4)(as Co-Pi/BiVO_(4)) was prepared by electrodeposition in neutral phosphate buffer solution by optimizing the ratio of reactant molar ratio of n(Co(NO_(3))_(2)) to n(BiVO_(4))=1:3.Morphology,crystal form,chemical state,oxygen evolution and electrical impedance of Co-Pi/BiVO_(4)and CoOx/BiVO_(4)were characterized and compared.The results show that Co-Pi/BiVO_(4)has stronger oxidation ability and greater stability than CoOx/BiVO_(4).The degradation of ethanethiol by Co-Pi/BiVO_(4)was compared with that of CoOx/BiVO_(4)under visible light.The results show that the chemical oxygen demand removal rate of the former reaches 80%,and the desulfurization rate exceeds 78%,which are 25%and 14%higher than the later one,respectively.Meanwhile,the formation of CoOx-Co(PO_(4))xand the mechanism of chemical action were deeply analyzed,the reactive kinetics of Co-Pi/BiVO_(4)synthesized with different reaction ratios were studied,and the protonation pathway of·OH generation and the process of ethanethiol degradation were proposed.

关 键 词：磷酸盐缓冲溶液 Co-Pi/BiVO_(4) 乙硫醇废水 光降解 机制 

分 类 号：O643[理学—物理化学]