文献类型：期刊文献

英文题名：Performance of the graphite felt flow-through electrode in hexavalent chromium reduction using a single-pass mode

作者：Chen, Peng[1];Cheng, Rui[1];Meng, Guangyuan[1];Ren, Zhiming[1];Xu, Jiali[1];Song, Pengfei[2];Wang, Hualin[1,3];Zhang, Lehua[1,3,4]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Thomas Nelson Community Coll, Div Sci Engn & Technol, Hampton, VA 23452 USA;[3]East China Univ Sci & Technol, Natl Engn Lab Ind Wastewater Treatment, Shanghai 200237, Peoples R China;[4]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2021

卷号：416

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：;EI(收录号：20211510212819);WOS:【SCI-EXPANDED(收录号:WOS:000664767600002)】；

基金：This work was supported by the National Key Research and Development Program of China (Developing Highly Efficient Means of Water Utilization, 2019YFC0408202) , the National Natural Science Foundation of China (NSFC) (21876050) .

语种：英文

外文关键词：Flow-through electrode; Graphite felt; Electroreduction; Hexavalent chromium

摘要：Flow-through electrodes generally outcompete traditional parallel-plate electrodes in current efficiency and mass transfer. High-performance electrode materials can be costly and complicated to fabricate, hindering their wide application. In this study, we used commercial graphite felt (GF) as the cathode of a flow-through electrochemical cell to investigate its potential in treating Cr(VI) solution through electroreduction. The flow-through design with the porous GF electrode allowed sufficient contact surface with Cr(VI) and single-pass tests demonstrated a high reduction efficiency (95-100%) [117 mg/L-3 mg/L Cr(VI)] under acidic conditions. Slow flow rate and high current promoted electroreduction of Cr(VI). The presence of other metal ions could further improve Cr(VI) reduction at low flow rates due to enhanced conductivity in dilute solutions and generation of low valent ions as reducing agents. At fast flow rates, competition of these ions for reduction decreased Cr(VI) reduction efficiency. Moreover, an acidic environment prevented the coating of an insoluble layer on the GF surface and promoted durable performance, with a lower energy consumption [0.46 kWh for treating 100 L 117 mg/L Cr(VI) solution per unit area of GF]. This work demonstrated the potential of Cr(VI) detoxification using GF cathodes in flow-through electrochemical cell.