摘要
本文优化了活性铁的制备方法,研究了利用活性铁体系各组分处理含腐植酸、铬或镍废水的特性及作用机理,并对活性铁及其反应产物进行了XRD、FTIR和SEM表征。结果表明:(1)先通氮气5 min,再摇床反应7 h所得活性铁性能最佳,零价铁表面基本被粒径为50~100 nm蓬松Fe_(3)O_(4)颗粒覆盖;(2)活性铁体系中混杂存在的Fe 0、Fe^(2+)、Fe_(3)O_(4)及其他铁(氢)氧化物对腐植酸的去除具有协同效应,原液中强化Fe^(2+),可将腐植酸的去除率从70.1%提高到99.3%;(3)活性铁体系原液对重金属铬和镍的去除效率均接近100%。六价铬的去除主要依靠零价铁与六价铬之间的氧化还原反应完成,而二价镍主要是通过活性铁中四氧化三铁的吸附及与二价铁反应形成稳定的镍氢氧化物沉淀的方式去除。
In this paper,the preparation method of active iron was optimized,the characteristics and mechanism of using active iron system to treat wastewater containing humic acid,chromium or nickel were studied,and the active iron and its reaction products were characterized by XRD,FTIR and SEM.The results indicated that:(1)The optimal active iron was obtained by first blowing nitrogen for 5 minutes and then reacting in a shaker for 7 hours.The surface of zero-valent iron was basically covered by fluffy Fe 3 O 4 particles with a particle size of 50~100nm.(2)The mixed presence of Fe 0,Fe^(2+),Fe_(3)O_(4)and other iron(hydrogen)oxides in the active iron system had a synergistic effect on the removal of humic acid.The removal rate of humic acid could be increased from 70.1%to 99.3%by strengthening Fe 2+in the stock solution.(3)The removal efficiencies of heavy metals chromium and nickel by the active iron system were close to 100%.The removal of hexavalent chromium mainly relied on the oxidation-reduction reaction between zero valent iron and hexavalent chromium,while divalent nickel was mainly removed by the adsorption of Fe 3 O 4 in active iron and the formation of stable nickel hydroxide precipitation through the reaction with divalent iron.
作者
李芙蓉
周萌
LI Furong;ZHOU Meng(School of Chemical and Environmental Engineering,Wuhan Polytechnic University,Wuhan 430023,China)
出处
《武汉轻工大学学报》
CAS
2024年第1期41-46,共6页
Journal of Wuhan Polytechnic University
关键词
活性铁
腐植酸
铬
镍
废水处理
active iron
humic acid
chromium
nickel
wastewater treatment
