Ni-Fe/PAC颗粒电极电芬顿降解焦化废水生化尾水的研究  

Study on the Electro-Fenton Degradation of Biological Treatment Effluent from Coking Wastewater Using Particle Electrode Ni-Fe/PAC

作　　者：鹿浩然 杨童 韩旭 刘钰龙 彭先春 梁文艳[1] LU Haoran;YANG Tong;HAN Xu;LIU Yulong;PENG Xianchun;LIANG Wenyen(College of Environmental Science and Engineering,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]北京林业大学环境科学与工程学院,北京100083

出　　处：《水处理技术》2024年第11期25-30,38,共7页Technology of Water Treatment

基　　金：国家自然科学基金项目(51672028)。

摘　　要：针对焦化废水生化尾水中还存在大量难降解有机物的问题,采用活性炭负载镍铁的颗粒电极Ni-Fe/PAC进行降解处理。SEM、XRD、FTIR和BET表征结果显示,Ni-Fe/PAC负载的金属为镍铁合金,暴露于空气后,表面会形成铁氧化物,经碱液浸渍后的比表面积从717.95 m^(2)/g增加到了835.43 m^(2)/g,孔径主要分布在1~10 nm内。投加0.1 mmol/L的H_(2)O_(2)后,能显著提高·OH产生量和TOC的去除效率,且在0.2 A和水力停留时间60 min下,TOC和COD的去除效率达到64.9%和85%。处理后出水的pH为11.31,线性伏安扫描(LSV)和循环伏安扫描(CV)显示,碱性条件下,Ni-Fe/PAC的电化学活性面积(ECSA)面积达到250.17 cm^(2),析氢和析氧的Tafel斜率分别为148 mV/dec和261 mV/dec。电极使用后,表面形貌、晶体结构和官能团未发生明显改变,催化性能稳定。As for the problem that large amounts of refractory organic compounds still exist in the effluent of coking wastewater after biological treatment,a particle electrode Ni-Fe/PAC where the activated carbon was loaded with nickel and iron was employed.The characterization results from SEM,XRD,FTIR,and BET confirmed that the loaded metals were the nickel-iron alloy on the Ni-Fe/PAC surface.After exposure to the air,the alloy surface formed iron oxides.Alkali impregnation increased the specific surface area of Ni-Fe/PAC from 717.95 m^(2)/g to 835.43 m^(2)/g,making pore sizes predominantly within the range of 1~10 nm.The addition of 0.1 mmol/L H_(2)O_(2) significantly enhanced the generation amount of hydroxyl radical(·OH)and facilitated the removal of TOC.The 64.9%of TOC and 85%of COD were removed at 0.2 A and hydraulic retention time of 60 minutes.The pH value of the treated effluent was 11.31.Linear sweep voltammetry(LSV)and cyclic voltammetry(CV)analysis revealed that,under alkaline conditions,the electrochemical active surface area(ECSA)of Ni-Fe/PAC reached 250.17 cm^(2),with Tafel slopes of 148 mV/dec for hydrogen evolution and 261 mV/dec for oxygen evolution.The electrode maintained its catalytic performance without substantial alterations in surface morphology,crystal structure,and functional groups after extended use.

关 键 词：颗粒电极 电催化 焦化废水 生化尾水 镍 铁 

分 类 号：TQ520.8[化学工程—煤化学工程] X703.1[环境科学与工程—环境工程]