The degradation of ibuprofen in a novel microbial fuel cell with PANi@CNTs/SS bio-anode and CuInS 2 photocatalytic cathode: Property, efficiency and mechanism
The degradation of ibuprofen in a novel microbial fuel cell with PANi@CNTs/SS bio-anode and CuInS 2 photocatalytic cathode: Property, efficiency and mechanism
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采用PANi@CNTs/SS生物阳极和CuInS 2 光催化阴极的新型微生物燃料电池中布洛芬的降解：性能、效率和机制
DOI：
10.1016/j.jclepro.2020.121872
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发表时间：
2020
影响因子：
11.1
通讯作者：
Yu Jian
中科院分区：
文献类型：
--
作者：
Xu Peng;Zheng Dayang;Xie Zhiyi;He Qiulai;Yu Jian
微生物燃料电池是一种节能的降解有机污染物的生物电化学法，但由于其阴极过电位高、输出功率低、降解效率慢，在实际应用中受到一定的限制。在这里，一种新型的光催化微生物燃料电池(Photo-MFC)被用于布洛芬(IBU)的降解和同步发电。采用原位聚合法制备了生物阳极聚苯胺@碳纳米管/不锈钢(PANI@CNTs/SS)，并用BET、X射线衍射仪、扫描电子显微镜和循环伏安技术对PANI@CNTs和CNTs的性能进行了表征。采用X射线衍射仪、扫描电子显微镜和紫外-可见漫反射光谱等技术对光催化阴极CuInS2进行了表征。动力学数据证实了IBU在不同初始浓度和不同pH条件下的降解过程符合准一级动力学模型。在最佳条件下，最大功率密度为0.119 W/m2，电流密度为0.75A/m2，电压为950 mV，柱状效率(EC)为31%，能量转换效率(εE)为11%，阴极H_2O_2效率(RCAT)为52%，矿化电流效率(MC)为65.1%时，IBU的去除效率为75.94%。此外，捕获实验证明·O2−和·OH是主要的活性氧化物种，从而推测了该体系的电子传递机理和IBU的降解途径。最后，验证了新型光生MFC能够提高半导体光载流子的分离度，增强污染物的阴极还原能力，是一种长期稳定的难降解污染物生态友好处理新技术，为今后的工程应用提供了实验依据。
Microbial fuel cell is an energy-saving bioelectrochemical method for degrading organic pollutants, but it has some limitations in practical application due to the high cathode overpotential, low power output and slow degradation efficiency. Here, a novel photo-catalytic microbial fuel cell (Photo-MFC) coupling with a bioanode and a photocatalytic cathode, is used for ibuprofen (IBU) degradation and simultaneous power generation. Bioanode polyaniline@carbon nanotubes/stainless steel (PANi@CNTs/SS) is synthesized through an in-situ polymerization method, and the properties of PANi@CNTs and CNTs are characterized via BET, XRD, SEM and CV techniques. Photocatalytic cathode CuInS2is characterized by techniques including the XRD, SEM and UV–Vis diffuse reflectance spectroscopy. And the kinetic data confirmed that the degradation process of IBU under different initial concentrations and different pH conditions conforms to the pseudo-first-order kinetic model. Under optimal conditions, IBU removal rate is 75.94% corresponding to the maximum power density 0.119 W/m2, current density 0.75 A/m2, voltage 950 mV, columbic efficiency (EC) 31%, energy conversion recovery (εE) 11%, cathodic H2O2efficiency (Rcat) 52%, mineralization current efficiency (MCE) 65.1%. Additionally, •O2−and •OH are proved to be the main reactive oxidative species by trapping experiments, thus electron transfer mechanism of the system and IBU degradation pathway are speculated. Finally, it is verified that the new Photo-MFC could improve the separation of semiconductor photocarriers and enhance the cathode reduction of pollutants, which is a new long-term stable eco-friendly treatment technology for refractory pollutants and provides an experimental basis for the future engineering application.