PVA/OPD改性膜对微生物燃料电池性能的影响

Effect of PVA/OPD modified membrane on the performance of microbial fuel cell

为提高微生物燃料电池(MFC)的性能,以聚乙烯醇(PVA)为黏合剂,分别以磷钨酸(PWA)和邻苯二胺(OPD)为改性剂,采用溶液浸渍法制备了PVA/PWA和PVA/OPD改性膜并搭载于MFC系统,以SEM、电化学阻抗谱(EIS)、循环伏安法(CV)、吸水率表征了膜的性能,并考察膜改性对MFC产电量和化学需氧量(COD)去除率的影响。结果显示,PVA/PWA和PVA/OPD改性膜均能在一定程度上提升MFC性能,但PVA/OPD改性膜效果更佳。PVA/OPD改性膜的吸水率为14.49%,较常规Nafion 117膜(NF)提高了126.05%。采用PVA/OPD改性膜的MFC在测试周期内的产电量为101.75 J,较采用NF时提高了587.50%;对阿莫西林制药废水的COD去除率为66.2%,较采用NF时提高了48.4%。基于PVA/OPD的膜改性方法对提高MFC的产电性能和废水处理效果有显著作用。

To improve the performance of microbial fuel cell(MFC),polyvinyl alcohol(PVA)/phosphotungstic acid(PWA)and PVA/o-phenylenediamine(OPD)modified membranes were synthesized by solution impregnation method with PVA as adhesive,PWA and OPD as modifier,respectively,and then mounted on MFC system.The membranes were characterized by SEM,electrochemical impedance spectroscopy(EIS),cyclic voltammetry(CV)and water absorption for property analysis,followed by investigation on the effects of membrane modification on the MFC power generation and the removal rate of chemical oxygen demand(COD).The results showed that,though both PVA/PWA and PVA/OPD modified membranes improved the MFC performance to a certain extent,PVA/OPD exhibited better efficacy.The water absorption of PVA/OPD modified membrane was about 14.49%,126.05% higher than that of the conventional Nafion 117 membrane(NF).The output energy of MFC with PVA/OPD modified membrane in the test cycle was 101.75 J,587.50% higher than that of MFC with NF,and the COD removal rate of amoxicillin pharmaceutical wastewater was 66.2%,which was 48.4% higher than that of MFC with NF.Therefore,the membrane modification method based on PVA/OPD displayed significant effect on improving the power generation performance and wastewater treatment efficiency of MFC.