Natural Fe-bearing manganese ore facilitating bioelectro-activation of peroxymonosulfate for bisphenol A oxidation
Natural Fe-bearing manganese ore facilitating bioelectro-activation of peroxymonosulfate for bisphenol A oxidation
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DOI：
10.1016/j.cej.2018.08.066
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发表时间：
2018-12
影响因子：
15.1
通讯作者：
Suding Yan;Xinping Zhang;Yue Shi;Hui Zhang
中科院分区：
文献类型：
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作者：
Suding Yan;Xinping Zhang;Yue Shi;Hui Zhang
利用天然含铁锰矿（FMO）和单室微生物燃料电池（MFC）提供的生物电，构建了过一硫酸盐（PMS）活化系统（FMO/MFC/PMS），用于降解双酚A（BPA）。采用X射线荧光（XRF）、X射线衍射（XRD）、傅里叶变换红外（FTIR）光谱、BET、场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）对FMO进行了表征。结果表明，ε-MnO 2和α-Fe 2 O3是天然FMO的活性组分，它们对PMS的生物电活化有很大的促进作用。当FMO投加量为0.5 g L-1，PMS浓度为10 mM，电流密度为100 mA m-2时，在自然pH条件下反应80 min，BPA降解率可达97.8%，当反应时间延长至120 min时，TOC去除率可达80%左右。结合电子顺磁共振结果、清除实验、荧光光谱实验和X射线光电子能谱分析，认为BPA的去除既有自由基氧化（硫酸根和羟基自由基），也有非自由基反应（单线态氧和直接电子转移）。FMO表现出良好的稳定性，并且可以重复使用至少3次而无需任何额外的特殊处理。10 mM的Cl-和HCO 3-可以抑制BPA的降解，而10 mM的NO3-对BPA的去除效果可以忽略不计。FMO/MFC/PMS工艺可以在不降低BPA去除率的情况下应用于天然水。
The natural Fe-bearing manganese ore (FMO) and bioelectricity supplied by a single-chamber microbial fuel cell (MFC) were employed to construct the peroxymonosulfate (PMS) activation system (FMO/MFC/PMS) for the degradation of bisphenol A (BPA). The FMO was characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Brunauer-Emmett-Teller (BET), field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The results show that ε-MnO2and α-Fe2O3were the active components of the natural FMO and they could greatly facilitate the bioelectro-activation of PMS for the oxidation of BPA. When FMO dosage, PMS concentration and current density were set as 0.5 g L−1, 10 mM and 100 mA m−2, respectively, 97.8% of BPA degradation could be achieved at natural pH of BPA solution after 80 min reaction and about 80% of TOC could be removed when the reaction time was prolonged to 120 min. Based on the electron paramagnetic resonance result, scavenging tests, fluorescence spectra experiment and X-ray photoelectron spectroscopy analysis, both radical oxidation (sulfate and hydroxyl radical) and non-radical reactions (such as singlet oxygen and direct electron transfer) were considered to be responsible for BPA removal. The FMO exhibited good stability and could be recycled at least 3 runs without any additional special treatment. 10 mM of Cl−and HCO3−could suppress the degradation of BPA while 10 mM of NO3−showed negligible effects on BPA removal. The FMO/MFC/PMS process could be applied in natural water without the decrease of BPA removal.