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201×7树脂对铁氰络合物的吸附动力学
Adsorption kinetics of 201×7 resin for iron cyanocomplexes
【Author】 LAN Xin-zhe LI Xiu-ling SONG Yong-hui ZHANG Qiu-li (Institute of Precious Metal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)
【机构】 西安建筑科技大学贵金属工程研究所;
【摘要】 对201×7树脂吸附铁氰化合物的过程进行动力学研究。结果表明,201×7树脂对铁氰化合物有很好的吸附效果。在298 K 时,201×7树脂对亚铁氰化络合离子[Fe(CN)6]4-和铁氰化络合离子[Fe(CN)6]3-的静态饱和吸附量分别为8.620和12.072 mg/mL。用均相颗粒扩散模型和收缩核模型对吸附参数进行描述,表明201×7树脂对[Fe(CN)6]3-和[Fe(CN)6]4-的吸附过程均属于液膜扩散控制。由树脂对[Fe(CN)6]4-和[Fe(CN)6]3-的等温吸附线得到 Freundlich 常数 n 分别为4.786和6.145;吸附过程中分离系数 S 和选择系数 K 均大于1,表明201×7树脂对 [Fe(CN)6]4-和[Fe(CN)6]3-两种络合离子都是容易吸附的,而且[Fe(CN)6]3-离子比[Fe(CN)6]4-离子更容易破吸附。
【Abstract】 Kinetics measurements on the adsorption of iron cyanocomplexes with the 201×7 ion-exchange resin were investigated.The results show that the 201×7 resin has good adsorption ability for iron cyanocomplexes.The static saturated adsorptive capacity at 298 K is 8.620 and 12.072 mg/mL for ferrocyanide [Fe(CN)6]4- and ferricyanide [Fe(CN)6]3-,respectively.Analyses of the respective rate data in accordance with homogeneous particle diffusion model and shell progressive model are used to explain the ions adsorption kinetics,which indicates that the controlling step of adsorbing [Fe(CN)6]3- and [Fe(CN)6]4- is liquid film diffusion.Isotherm adsorption curves deduce that Freundlich constant,n,is 4.786 and 6.145 for [Fe(CN)6]4- and [Fe(CN)6]3-,respectively.In adsorption process,the separation factor S and selectivity coefficient K are both greater than 1.The facts indicate that both [Fe(CN)6]4- and [Fe(CN)6]3- are easily adsorbed on 201×7 resin,furthermore,the adsorption of [Fe(CN)6]3- on 201×7 resin is easier than that of [Fe(CN)6]4-.
- 【会议录名称】 2008年全国湿法冶金学术会议论文集
- 【会议名称】2008年全国湿法冶金学术会议
- 【会议时间】2008-04
- 【会议地点】中国江西赣州
- 【分类号】X703
- 【主办单位】中国有色金属学会冶金物理化学学术委员会