超细粉煤灰基成型吸附剂的制备及性能研究  

Preparation of ultra-fine forming fly ash based adsorbent and its properties

作　　者：刘转年[1] 刘源[1] 赵晓光[1] 

机构地区：[1]西安科技大学地质与环境学院,陕西西安710054

出　　处：《煤炭学报》2009年第9期1263-1267,共5页Journal of China Coal Society

基　　金：中国博士后科学基金资助项目(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);西安市工业攻关项目(GG06074)

摘　　要：为了增加粉煤灰的反应活性,将原料粉煤灰(RFA)进行超细球磨得到超细粉煤灰(UFA),将超细粉煤灰与NaOH溶液反应后挤出成型烘干,得到超细粉煤灰基成型吸附剂(UF-FA),通过XRD和SEM对其进行表征.研究了RFA,UFA和UFFA对Cr6+的吸附性能.结果表明:UFFA的吸附性能优于UFA,RFA最差;UFFA对Cr6+的吸附过程符合二级吸附动力学模型,吸附过程由颗粒内扩散过程控制.热力学研究表明:UFFA对Cr6+的吸附符合Langmuir吸附等温式;UFFA对Cr6+吸附热力学参数ΔG<0,ΔH=-5.391 kJ/mol,表明吸附是自发放热过程.In order to increase the reaction activity of fly ash, raw fly ash （RFA） was ball milled and ultra-fine fly ash （UFA） was obtained. UFA was reacted with NaOH solution, the mixture was extruded and dried after reaction, the ultra-fine forming fly ash-based adsorbent （UFFA） was gained. The adsorptive properties of RFA, UFA and UFFA for Cr^6＋ were studied. The results show that the adsorption capacity of three adsorbents follows the order： UFFA 〉 UFA 〉 RFA. The kinetics of Cr^6＋ on UFFA fitted the second order kinetic model and the adsorption processes is controlled by intra-particle diffusion. The adsorption equilibrium of Cr^6＋ on UFFA can be described in terms of Langmuir isotherm. The adsorption thermodynamic parameters free energy （△G） of Cr^6＋ is negative and enthalpy （△H） is -5. 391 kJ/mol which indicates the adsorption process is spontaneous and exothermic.

关 键 词：超细粉煤灰 吸附剂 CR^6+ 

分 类 号：X751[环境科学与工程—环境工程]