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.
出处
《洁净煤技术》
CAS
北大核心
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)
关键词
超细粉煤灰
吸附
含铬废水
ultra fine coal fly ash
adsorption
Cr(Ⅵ) - Containing wastewater
作者简介
吕晓军(1977-),男,陕西凤翔人,工程师,硕士,研究方向为固体废弃物资源化利用、环境材料和废水处理技术。