Influence of Coal Fly Ash Particle Size on Structure and Adsorption Properties of Forming Adsorbents for Cr^6＋  

作　　者：刘转年 ZHANG Yuanyuan AN Yangkang JING Xiuyan LIU Yuan 

机构地区：[1]College of Geology and Environment, Xi 'an University of Science & Technology, Xi 'an 710054,China [2]Key Laboratory of Environmental Protection & Pollution and Remediation of Water and Soil of Shaanxi Province(Chang'an University), Xi'an 710064, China [3]College of Chemistry and Chemical Engineering, Xi'an University of Science & Technology, Xi'an 710054, China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2016年第1期58-63,共6页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(No.51278418);the Natural Science Basic Research Plan in Shaanxi Province of China(No.2013K11-10);the Key Laboratory of Environmental Protection&Pollution and Remediation of Water and Soil of Shaanxi Province(Chang’an University)

摘　　要：Forming adsorbents FFA-R,FFA-A and FFA-B were prepared from different particle size coal fly ashes FA-R,FA-A and FA-B,their average particle sizes（d_（50）） were 15.75,3.61 and 1.73 μm respectively.The structure and adsorption properties for Cr^（6＋） of forming adsorbents from aqueous solution were studied.The results show that forming adsorbent prepared from the coal fly ash with smaller particle size exhibits higher specific surface area,higher pore volume and better adsorption properties for Cr^（6＋）.The adsorption kinetics of Cr^（6＋） on FFA-R,FFA-A and FFA-B fitts the second order kinetic model and the second adsorption rate constants are 7.523,3.197 and 2.187 mg·g^（-1）·min^（-1/2）,respectively.The adsorption of Cr^（6＋） on FFA-R,FFA-A and FFA-B can be described in terms of Langmuir isotherms better,and the adsorption processes are spontaneous and exothermic.Forming adsorbents FFA-R,FFA-A and FFA-B were prepared from different particle size coal fly ashes FA-R,FA-A and FA-B,their average particle sizes（d_（50）） were 15.75,3.61 and 1.73 μm respectively.The structure and adsorption properties for Cr^（6＋） of forming adsorbents from aqueous solution were studied.The results show that forming adsorbent prepared from the coal fly ash with smaller particle size exhibits higher specific surface area,higher pore volume and better adsorption properties for Cr^（6＋）.The adsorption kinetics of Cr^（6＋） on FFA-R,FFA-A and FFA-B fitts the second order kinetic model and the second adsorption rate constants are 7.523,3.197 and 2.187 mg·g^（-1）·min^（-1/2）,respectively.The adsorption of Cr^（6＋） on FFA-R,FFA-A and FFA-B can be described in terms of Langmuir isotherms better,and the adsorption processes are spontaneous and exothermic.

关 键 词：coal fly ash forming adsorbent adsorption Cr^（6＋） 

分 类 号：TQ424[化学工程]