摘要
通过城市污泥热解制备污泥生物炭(BC),采用FeCl3溶液浸渍污泥生物炭后制备出磁性污泥生物炭(MBC),对比了BC与MBC去除水溶液中Cd(Ⅱ)的能力。考察溶液初始pH、吸附时间、吸附温度以及Cd(Ⅱ)初始浓度对BC和MBC去除Cd(Ⅱ)效果的影响。结果表明,BC和MBC均符合拟二级动力学吸附模型;Langmuir吸附等温模型能够更好地描述BC和MBC去除Cd(Ⅱ)的过程。在溶液初始pH为6.0,生物炭投加量为10 mg,Cd(Ⅱ)质量浓度为10~150 mg/L的溶液25 mL,吸附时间为360 min,温度为25℃的最佳条件下,BC和MBC对Cd(Ⅱ)最大的吸附量分别为76.93 mg/g和167.42 mg/g。经过5次吸附解吸试验,MBC的Cd(Ⅱ)去除率保持在90%以上,BC的Cd(Ⅱ)去除率在55%左右,说明MBC具有更好应用于去除含Cd(Ⅱ)废水的能力。
Sludge biochar(BC)was prepared by pyrolysis of municipal sludge,and magnetic sludge biochar(MBC)was prepared by impregnating sludge biochar with FeCl3 solution.The removal ability of Cd(Ⅱ)in aqueous solution by BC and MBC was compared.The influence of the initial pH of the solution,adsorption time,temperature and the initial concentration of Cd(Ⅱ)on the Cd(Ⅱ)removal by biochars were investigated.The results showed that BC and MBC conformed to the pseudo-second-order model.The Langmuir adsorption isotherm model could better describe the process of removing Cd(Ⅱ)by BC and MBC.Under the optimal conditions of initial pH 6.0 of the solution,10 mg of biochar dosage,25 mL of 10-150 mg/L Cd(Ⅱ)solution,360 min of adsorption time,and temperature of 25℃,the maximum adsorption capacity of BC and MBC on Cd(Ⅱ)was 76.93 mg/g and 167.42 mg/g,respectively.After five adsorption-desorption experiments,the removal efficiency of MBC remained above 90%,while the removal efficiency of BC was about 55%,indicating that MBC had better ability to remove Cd(Ⅱ)-containing wastewater.
作者
周雅兰
周冰
Zhou Yalan;Zhou Bing(Shijiazhuang Vocational College of Finance&Economics,Shijiazhuang 050000,China;School of Chemistry,Chemical Engineering and Environmental Engineering,Liaoning Key Laboratory of Petrochemical Engineering,Liaoning Shihua University,Fushun 113001,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2021年第5期80-85,共6页
Industrial Water Treatment
基金
国家自然科学基金项目(21201096,21703091)。
