(西安建筑科技大學(xué) 貴金屬工程研究所，西安，710055)
摘 要: 對(duì)201×7樹(shù)脂吸附鐵氰化合物的過(guò)程進(jìn)行動(dòng)力學(xué)研究。結(jié)果表明，201×7樹(shù)脂對(duì)鐵氰化合物有很好的吸附效果。在298 K時(shí)，201×7樹(shù)脂對(duì)亞鐵氰化絡(luò)合離子[Fe(CN)6]4−和鐵氰化絡(luò)合離子[Fe(CN)6]3−的靜態(tài)飽和吸附量分別為8.620和12.072 mg/mL。用均相顆粒擴(kuò)散模型和收縮核模型對(duì)吸附參數(shù)進(jìn)行描述，表明201×7樹(shù)脂對(duì)[Fe(CN)6]3−和[Fe(CN)6]4−的吸附過(guò)程均屬于液膜擴(kuò)散控制。由樹(shù)脂對(duì)[Fe(CN)6]4−和[Fe(CN)6]3−的等溫吸附線(xiàn)得到Freundlich常數(shù)n分別為4.786和6.145；吸附過(guò)程中分離系數(shù)S和選擇系數(shù)K均大于1，表明201×7樹(shù)脂對(duì)[Fe(CN)6]4−和[Fe(CN)6]3−兩種絡(luò)合離子都是容易吸附的，而且[Fe(CN)6]3−離子比[Fe(CN)6]4−離子更容易被吸附。
關(guān)鍵字: 201×7樹(shù)脂；鐵氰化物；吸附；動(dòng)力學(xué)
（Institute of Precious Metal Engineering, Xi’an University of Architecture and Technology,
Xi’an 710055, China）
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−.
Key words: 201×7 resin; iron cyanocomplex; adsorption; kinetics
