Bi-SnO_(2)电催化膜的制备及对饮用水中卡马西平的强化去除

Fabrication of Bi-SnO_(2) electro-catalytic membrane for enhanced removal of carbamazepine in drinking water

以家用净水器活性炭滤芯为支撑体(Carbon membrane,CM),通过电沉积法制备Bi-SnO_(2)电催化膜(Bi-SnO_(2)/CM),通过电催化强化降解饮用水中的PPCPs.采用SEM、EDS、XRD分别对CM、SnO_(2)/CM和Bi-SnO_(2)/CM进行了结构表征,并利用Tafel、CV、EIS方法对3种膜的析氧电势、比电容和电化学阻抗等电化学特性进行表征,并选取卡马西平(Carbamazepine,CBZ)作为PPCPs代表物进行电催化效能试验研究.结果表明:采用电沉积-水热方法制备的Bi-SnO_(2)纳米颗粒的粒径尺寸约为27.2nm,可以很好地负载到活性炭滤芯表面,并制备出电化学性能优异的电催化膜,相比基膜其Tafel斜率由31.09mV/dec增至80.22mV/dec,电化学阻抗由1.03Ωcm^(2)降低为0.37Ωcm^(2),比电容也由0.689F/g增至2.635F/g.最终通过实验验证了其对卡马西平的降解效果,在静态循环实验中,Bi-SnO_(2)/CM对CBZ的去除率30min可达到97.3%,在运行1h后矿化率为59.2%,耗能为123.87kW·h/kgTOC,ΔTMP为0.177kPa.在连续运行时,Bi-SnO_(2)/CM对CBZ的去除率达93.7%,在运行1h后矿化率为35.2%,耗能为208.33kW·h/kgTOC,ΔTMP为0.613kPa.说明Bi-SnO_(2)/CM电催化膜具有良好的导电性、电催化活性和稳定性,同时对CBZ具有较好的去除效果.

This study aimed to develop an electro-catalytic membrane for the efficient removal of pharmaceutical and personal care products(PPCPs)from drinking water.The membrane was fabricated by depositing nanoscale Bi-SnO_(2) onto carbon membrane(CM)in household water purifiers.To characterized the membranes,scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS),and X-ray diffraction(XRD)techniques were employed.The electrochemical performance of the membranes,including oxygen evolution potential,specific capacitance,and impedance,was evaluated using Tafel analysis,cyclic voltammetry(CV),and electrochemical impedance spectroscopy(EIS).Carbamazepine(CBZ)was chosen as a representative PPCP to assess the electro-catalytic performance of the membranes.The results showed that the particle size of Bi-SnO_(2) nanoparticles prepared by electrodeposition-hydrothermal method is about 27.2nm,which could be well loaded on the surface of activated carbon filter element,and the electrocatalytic membrane with excellent electrochemical performance was prepared.compared with the base membrane,the Tafel slope increases from 31.09mV/dec to 80.22mV/dec,the electrochemical impedance decreased from 1.03Ωcm^(2) to 0.37Ωcm^(2),and the specific capacitance increased from 0.689F/g to 2.635F/g.Finally,the degradation effect of carbamazepine was verified by experiments.In the static cycle experiment,the removal rate of CBZ by Bi-SnO_(2)/CM reached 97.3%,the mineralization rate was 59.2%after 1 h,the energy consumption was 123.87kW·h/kgTOC,andΔTMP was 0.177kPa.In continuous operation,the removal rate of CBZ by Bi-SnO_(2)/CM was 93.7%.The mineralization rate was 35.2%,the energy consumption is 208.33kW·h/kgTOC,and theΔTMP was 0.613kPa after 1 h.The results showed that the Bi-SnO_(2)/CM electrocatalytic membrane exhibited good electrical conductivity,electrocatalytic activity and stability,and has a good effect on the removal of CBZ.