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化学学报
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化学学报 ›› 1988, Vol. 46 ›› Issue (10): 945-951.    下一篇

研究论文

金的离子交换与吸附化学 II: 大孔交联聚甲基丙烯酸酯MET-802对AuCl4^-的吸附及解吸动力学

邱陵;贾东方;原纪炳;林雪;何炳林   

  1. 兰州大学现代物理系;南开大学化学系
  • 发布日期:1988-10-15

Ion exchange and adsorption chemistry of gold II: Adsorption and desorption kinetics of AuCl4^- on macroreticular polyacrylate resin MET-802

QIU LING;JIA DONGFANG;YUAN JIBING;LIN XUE;HE BINGLIN   

  • Published:1988-10-15

PDF

473

被引次数

10

研究了大孔交联聚甲基丙烯酸酯树脂(相当于Amberlite-XAD-7)吸附和解吸AuCl4^-的动力学. 结果表明, 两种过程均由液膜扩散转向粒内扩散主控. HCl浓度对吸附AuCl4^-过程影响甚微, 研究了HCl-硫脲为解吸剂时的动力学, 表明液膜扩散常数R和粒内扩散常数B对树脂半径r0的关系服从Boyd方程.

关键词: 氯化物, 大孔网状结构离子交换树脂, 解吸, 聚甲基丙烯酸酯, 吸附动力学, 金化合物

The kinetics of adsorption and desorption of AuCl4- on macroreticular polyacrylate resin (analogous to Amberlite XAD-7) were studied. The rate determing step in both processes is film diffusion at the initial stage followed by particle diffusion. The effect of HCl concentration on the adsorption of AuCl4- is insignificant; the diffusion coefficient DAuCl4- = 4.4 ?10-8 cm-2 s-1 at 25?and adsorption activation energy DEa = -13.0 kJ mol-1. The desorption kinetics for the process using HCl-thiourea as desorption agent were studied. The relation between the liquid film diffusion constant R and the particle diffusion constant B with resin particle radius r0 follows the G. Boyd (1947) equation.

Key words: CHLORIDE, MACRORETICULAR STRUCTURE ION EXCHANGE RESINS, DESORPTION, POLYMETHACRYLATE, ADSORPTION KINETIC, GOLD COMPOUNDS

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