超细粉煤灰对含铬废水的吸附性能和机理研究  

Study on adsorptive capacity and mechanism of Cr(VI)-Containing wastewater by using ultra fine coal fly ash

作　　者：吕晓军[1] 何婵[1] 

机构地区：[1]西安科技大学地质与环境工程系,陕西西安710054

出　　处：《洁净煤技术》2008年第3期84-87,共4页Clean Coal Technology

基　　金：中国博士后科学基金项目(20070411124);陕西省工业攻关项目(2006k07-G19);陕西省教育厅产业化培育项目(06JC11);西安市科技局工业攻关项目(GG06074)

摘　　要：以西郊和灞桥电厂粉煤灰（XFA和BFA）为原料，通过球磨法制得超细粉煤灰（XU—FA和BUFA），研究其对含铬废水的吸附性能和机理。结果表明，在25℃，pH值为2～3之间，反应时间为90min，投加量为1．0g时，吸附效果最好，BFA对Cr（Ⅵ）的去除率为29．5％，XFA对Cr（Ⅵ）的去除率为25．5％，BUFA对Cr（Ⅵ）的去除率为36．5％，XUFA对Cr（Ⅵ）的去除率为33．3％。随温度升高，吸附量降低，证明该吸附反应过程为放热过程。对实验数据运用相关数学模型拟合，显示等温吸附平衡符合Langmuir吸附等温式，吸附过程动力学更适合二级吸附动力学模型。Ultra fine coal fly ash was prepared from coal fly ash by ball milling. The adsorptive capacity and mechanism of adsorbing Cr（Ⅵ） were studied. The result showed that under the conditions of pH 2 - 3 ,the adsorption temperature of 25℃ ,a dosage of 1. 0g and a reaction time of 90 minutes, the Cr（Ⅵ） removal efficiency can reach 29. 5% for BFA,25.5% for XFA,36.5% for BUFA and 33.3% for XUFA. The adsorption capacity decreased with increase of temperature indicated that the adsorption was a exothermic process. Fitting the experimental data utilizing the related mathematic models, showing the isotherm adsorption equilibrium conformed to Langmuir model, and the adsorption process kinetic more adopted to the second-order reaction.

关 键 词：超细粉煤灰 吸附 含铬废水 

分 类 号：X703[环境科学与工程—环境工程]