摘要
采用高温焙烧法制备改性粉煤灰(MFA),考察了改性粉煤灰投加量、初始pH、吸附时间对水中Pb(Ⅱ)吸附效果的影响,通过吸附动力学方程和吸附等温线方程对吸附机理进行了分析。结果表明,在温度30℃,初始Pb(Ⅱ)浓度40 mg/L,MFA投加量2 g/L,pH为5.5,吸附时间为30 min时,Pb(Ⅱ)的吸附率达到97.97%,水中残留的Pb(Ⅱ)浓度低于1.0 mg/L,满足排放标准的要求。吸附动力学符合拟二级动力学方程,吸附等温线符合Freundlich方程,吸附机制为化学吸附。
The modified fly ash was prepared by high temperature calcination method.The effects of adsorbent dosage,initial pH and adsorption time on the Pb(Ⅱ)adsorption capacity were investigated.The adsorption kinetics were studied and the experimental data was also fitted with the isotherm equilibrium models.The results show that at the situation of 30℃and 40 mg/L initial concentration of Pb(Ⅱ),when the adsorbent dosage was 2 g/L,the initial pH was 5.5 and the adsorption time was 30 min,the adsorption efficiency of Pb(Ⅱ)reached 97.97%and the residual Pb(Ⅱ)concentration in water was below 1.0 mg/L,which could meet the emission standard.The adsorption kinetic data was fitted well to the pseudo-second order kinetic equation and the adsorption isotherm was well described by the Freundlich equation.The adsorption process was the chemical adsorption.
作者
骆欣
敖燕环
徐东耀
路坦
LUO Xin;AO Yan-huan;XU Dong-yao;LU Tan(School of Chemical and Environmental Engineering,China University of Mining & Technology,Beijing 100083,China;School of Environmental Ennineerinn,North China Institute of Science & Technology,Beijing 101601,China;School of Saety Engineering,North China Institute of Science & Technology,Beijing 101601,China)
出处
《应用化工》
CAS
CSCD
北大核心
2019年第5期1020-1023,共4页
Applied Chemical Industry
基金
国家自然科学基金项目(61472137)
中央高校基本科研业务费项目(3142014017
3142018053)
