摘要
将取自于西安市西郊热电厂的原粉煤灰(FA)球磨5h得到超细粉煤灰(UFA),再经过微波辐照处理得到微波辐照改性超细粉煤灰(MFA),并研究其对含铬废水的吸附性能。动力学研究结果表明,改性粉煤灰对Cr(VI)的吸附符合二级吸附动力学模型,通过模型计算出的FA,UFA和MFA的二级吸附速率常数(k2)分别为2.45×10-2,3.88×10-2和5.14×10-2g.mg-1.m in-1;热力学研究结果表明,吸附过程可以用Langmuir方程描述。
Raw coal fly ash （ FA）, collected from a thermoelectricity power station in the west of Xi＇an, was ball milled for 5h and got ultra-fine coal fly ash（UFA）. UFA was modified by microwave irradiation and then obtained modified ultrafine coal fly ash（MFA）. The adsorption behavior and mechanism of Cr（Ⅵ） adsorption onto FA, UFA and MFA were studied. Kinetic studies showed that Cr（VI）adsorption onto modified coal fly ash fitted the secondorder kinetic model. The second-order rate constants （k2）calculated from the equation were 2.45×10^-2,3.88×10^-2 and 5.14×10^-2g·mg^-1 . min-i for FA, UFA and MFA, respectively. Isotherm studies illustrated that adsorption could be described by Langmuir isotherm model.
出处
《洁净煤技术》
CAS
北大核心
2008年第5期100-103,共4页
Clean Coal Technology
关键词
粉煤灰
微波
含铬废水
吸附
coal fly ash
modify
microwave
Cr（Ⅵ） - containing wastewater
adsorption
