二氧化铈/氮掺杂氮化碳光催化处理焦化废水  

Photocatalytic treatment of coking wastewater by cerium oxide loading with nitrogen-doping co-modified graphite carbon nitride

作　　者：安宁 郝玉莹 胡绍伟 陈鹏 王飞 王永 刘芳 李函霏 AN Ning;HAO Yuying;HU Shaowei;CHEN Peng;WANG Fei;WANG Yong;LIU Fang;LI Hanfei(State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan 114009,China;Iron&Steel Research Institute of Ansteel Group,Institute of Environment and Resources,Anshan 114009,China;Ansteel Engineering Technology Corporation Limited,Water Science and Technology Division,Anshan 114000,China)

机构地区：[1]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009 [2]鞍钢集团钢铁研究院环境与资源研究所,辽宁鞍山114009 [3]鞍钢集团工程技术有限公司水务科技事业部,辽宁鞍山114000

出　　处：《工业水处理》2024年第12期184-191,204,共9页Industrial Water Treatment

摘　　要：焦化废水中毒性物质超过500种,是公认的难处理废水。国内多数焦化企业的生产废水采用生化-物化法处理,最终出水水质指标难以达到《炼焦化学工业污染物排放标准》(GB 16171—2012)。因此,对焦化废水进行深度处理回用成为行业热点。作为最受青睐的光催化材料,石墨相氮化碳(g-C_(3)N_(4))被广泛用于去除水中有机污染物。采用二氧化铈(CeO_(2))负载及氮掺杂来优化氮化碳,成功制备出具有良好吸光性能及光生载流子分离效率的CeO_(2)/N-g-C_(3)N_(4)(CeO_(2)/NGCN)复合光催化剂。CeO_(2)/NGCN(质量分数1%)展现了极佳的光催化性能,120 min内对焦化废水生化出水COD、UV254的降解效率分别达到了49.79%、69.37%,远高于g-C_(3)N_(4)及氮掺杂g-C_(3)N_(4)。氮掺杂及二氧化铈负载可有效拓宽g-C_(3)N_(4)的光吸收范围,促进光生载流子分离效率,对构建高性能g-C_(3)N_(4)基光催化剂具有借鉴意义。Coking wastewater contains over 500 species toxic substances,and is recognized as the most intractable treated wastewater.Currently,most domestic coking twastewater is treated by biochemical-physicochemical method,and the final effluent water quality is still difficult to meet the“Discharge Standard for Coking Chemical Industry Pollutants”(GB 16171-2012).Thus,the deep treatment and reuse of coking wastewater has become a hot topic in the industry.In order to make up for the shortage of g-C_(3)N_(4) monomer,CeO_(2)/N-doped g-C_(3)N_(4)(CeO_(2)/NGCN)composite photocatalysts co-modified with nitrogen doping and CeO_(2) loading were designed and synthesized with expanding visible light absorption and promoting photogenerated carrier separation.The CeO_(2)/NGCN(mass fraction of 1%)exhibited excellent photodegradation performance,the removal rate of COD and UV254 in the coking wastewater after biological treatment reached 49.79% and 69.37% within 120 min,respectively,which was much higher than that of g-C_(3)N_(4) and N-doped g-C_(3)N_(4).This work proved that N-doping and CeO_(2) loading could effectively broaden the photoresponse range of g-C_(3)N_(4),facilitate the separation of photogenerated electron-hole pairs,which provided a reference for the construction of g-C_(3)N_(4)-based photocatalyst with high-efficiency photodegradation activity.

关 键 词：氮化碳 焦化废水 深度处理 光催化 

分 类 号：X703.1[环境科学与工程—环境工程]