粉煤灰改性及其吸附废水中Pb(Ⅱ)的研究

Applied Chemical Industry(2019)

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Abstract
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.
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