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
吕晓军;何婵;
Lu Xiao-jun,HE Chan (Dept.of Geology and Environment Engineering Xi'an University of Science & Technology,Xi'an 710054,China)
摘要(Abstract)：
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23之间,反应时间为90m in,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(KeyWords)：
超细粉煤灰;吸附;含铬废水
ultra fine coal fly ash;adsorption;Cr(VI)-Containing wastewater
基金项目(Foundation): 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)
作者(Authors):
吕晓军;何婵;
Lu Xiao-jun,HE Chan (Dept.of Geology and Environment Engineering Xi'an University of Science & Technology,Xi'an 710054,China)
DOI: 10.13226/j.issn.1006-6772.2008.03.022
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