Performance of nitrogen-doped graphene aerogel particle electrodes for electro-catalytic oxidation of simulated Bisphenol A wastewaters
Performance of nitrogen-doped graphene aerogel particle electrodes for electro-catalytic oxidation of simulated Bisphenol A wastewaters
复制标题
氮掺杂石墨烯气凝胶颗粒电极电催化氧化模拟双酚A废水的性能
DOI：
10.1016/j.jhazmat.2017.02.048
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发表时间：
2017-06-15
影响因子：
13.6
通讯作者：
Zhang, Dandan
中科院分区：
文献类型：
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作者：
Chen, Zhuang;Zhang, Yimei;Zhang, Dandan
实验研究了氮掺杂石墨烯气凝胶（NGAs）作为颗粒电极，在三维电极反应器中处理含双酚A （BPA）的废水。考察了电池电压、pH、NGAs质量与溶液体积比和重复次数对去除率的影响。与商业碳颗粒电极相比，NGAs对BPA模拟废水的去除活性更强。当BPA浓度为15 mg L-1时，在最佳条件下处理30 min后，BPA的降解率超过90%。对BPA的CODcr去除率为85%。在重复使用50次的过程中，BPA的降解率可保持在85%以上。CODcr去除率稳定在73%左右。采用液相色谱-质谱联用液相色谱（LC-MS）对电化学降解双酚a的中间产物进行了鉴定，并提出了可能的双酚a降解途径。认为(OH)- o中心点自由基通过水电解法不断攻击芳环，形成各种中间体，如羟基化双酚a、异丙酚、对苯二酚、苯酚和丁烷四醇、马来酸、草酸等。这些化合物最终通过电解变成二氧化碳和水而矿化。(C) 2017 Elsevier B.V.版权所有
The treatment of effluent containing Bisphenol A (BPA) was investigated experimentally using nitrogen doped graphene aerogel (NGAs) as particle electrodes in a three-dimensional electrode reactor for the electrochemical treatment was studied. The effects of the cell voltage, pH, the ratio of NGAs mass to solution volume and repeated times on the removal efficiency were investigated. Compared with commercial carbon particle electrodes, the NGAs exhibited stronger activity to remove BPA simulated wastewater. For 15 mg L-1 of BPA solution, the degradation rate of BPA exceeded 90% after treatment for only 30 min under the optimum conditions. The CODcr removal rate of BPA was 85%. Moreover, in the process of reused 50 times, the degradation rate of BPA can be kept in more than 85%. The CODcr removal rate was stable at about 73%. The intermediate products of electrochemical degradation of BPA were identified by liquid chromatography-mass spectrometry liquid chromatography (LC-MS), and a probable BPA degradation pathway was proposed. It was considered that (OH)-O-center dot radicals by water electrolysis could constantly attack the aromatic ring to form various intermediates such as hydroxylated-BPA, isopropylphenol, hydroquinone, phenol and butantetraol, maleic acid, oxalic acid. These compounds were eventually mineralized by electrolysis into CO2 and H2O. (C) 2017 Elsevier B.V. All rights reserved.