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Construction of a Microchannel Electrochemical Reactor with a Monolithic Porous-Carbon Cathode for Adsorption and Degradation of Organic Pollutants in Several Minutes of Retention Time.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-01-22 , DOI: 10.1021/acs.est.9b06266 Chunna Wang 1 , Yuwei Gu 1 , Shuai Wu 1 , Hongtao Yu 1 , Shuo Chen 1 , Yan Su 2 , Yunfei Guo 1 , Xiaoting Wang 1 , Hui Chen 1 , Wenda Kang 1 , Xie Quan 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-01-22 , DOI: 10.1021/acs.est.9b06266 Chunna Wang 1 , Yuwei Gu 1 , Shuai Wu 1 , Hongtao Yu 1 , Shuo Chen 1 , Yan Su 2 , Yunfei Guo 1 , Xiaoting Wang 1 , Hui Chen 1 , Wenda Kang 1 , Xie Quan 1
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A monolithic porous-carbon (MPC) electrode was fabricated to simultaneously intensify mass transfer and enhance reaction activity. The MPC involved channel arrays (about 50 μm of diameter for each channel) with mesopores and micropores in channel walls. The abundant surface pores may improve the reaction efficiency of the reduction of O2 to produce H2O2 and •OH. The function of channel arrays was to shorten the mass-transfer distance not only from O2 to the electrode surface but also from pollutants to the electrode surface and •OH. A microchannel electrochemical reactor was assembled to evaluate the performance of the MPC cathode. For 20 mg/L of phenol, sulfamethoxazole or atrazine, effluent concentration and total organic carbon (TOC) decreased down to 1.5 and 3 mg/L, respectively, in a retention time of only 100-300 s. Phenol removal was dominated by the MPC cathode, and the contribution of cathodic adsorption, cathodic degradation, and anodic reaction was 46, 33, and 8%, respectively. The proper working potential for the MPC cathode was +0.26 to +0.6 V versus reversible hydrogen electrode; in this potential range, no scaling was observed. For the real surface water (the initial TOC was 41.5 mg/L), TOC in effluent (the retention time was 335 s) was stable at 31.0 mg/L.
中文翻译：
构建具有整体多孔碳阴极的微通道电化学反应器，用于在数分钟的保留时间内吸附和降解有机污染物。
制作了整体多孔碳（MPC）电极，以同时加强传质并增强反应活性。MPC涉及通道阵列（每个通道的直径约为50μm），通道壁中带有中孔和微孔。丰富的表面孔可以提高O2还原生成H2O2和•OH的反应效率。通道阵列的功能是不仅缩短从O2到电极表面的传质距离，而且缩短从污染物到电极表面和•OH的传质距离。组装了微通道电化学反应器以评估MPC阴极的性能。对于20 mg / L的苯酚，磺胺甲基异恶唑或at去津，废水浓度和总有机碳（TOC）分别降至100和300 s，分别降至1.5 mg / L和3 mg / L。酚的去除主要由MPC阴极控制，阴极吸附，阴极降解和阳极反应的贡献分别为46、33和8％。MPC阴极相对于可逆氢电极的正确工作电位为+0.26至+0.6 V；在该电位范围内，未观察到结垢。对于实际的地表水（初始TOC为41.5 mg / L），废水中的TOC（保留时间为335 s）稳定在31.0 mg / L。
更新日期：2020-01-23
中文翻译：
构建具有整体多孔碳阴极的微通道电化学反应器，用于在数分钟的保留时间内吸附和降解有机污染物。
制作了整体多孔碳（MPC）电极，以同时加强传质并增强反应活性。MPC涉及通道阵列（每个通道的直径约为50μm），通道壁中带有中孔和微孔。丰富的表面孔可以提高O2还原生成H2O2和•OH的反应效率。通道阵列的功能是不仅缩短从O2到电极表面的传质距离，而且缩短从污染物到电极表面和•OH的传质距离。组装了微通道电化学反应器以评估MPC阴极的性能。对于20 mg / L的苯酚，磺胺甲基异恶唑或at去津，废水浓度和总有机碳（TOC）分别降至100和300 s，分别降至1.5 mg / L和3 mg / L。酚的去除主要由MPC阴极控制，阴极吸附，阴极降解和阳极反应的贡献分别为46、33和8％。MPC阴极相对于可逆氢电极的正确工作电位为+0.26至+0.6 V；在该电位范围内，未观察到结垢。对于实际的地表水（初始TOC为41.5 mg / L），废水中的TOC（保留时间为335 s）稳定在31.0 mg / L。
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