D201×4树脂对金(Ⅲ)的吸附

Sorption of Au(Ⅲ) on D201×4 Resin

大量的金是从金矿中获得．但需要很多工序。从含金的废液、废料中再生回收金也是获得金的重要来源，如：化学电镀法、电解法、硫脲法等都比较简单易行，但有各自的局限性和缺陷。20世纪70年代．炭吸附技术应用到提金业旧．但载金炭洗脱过程复杂、活性炭的碎裂磨损和再生等一系列问题需进一步解决。近年来有关含氮、氧、磷的树脂吸附某些金属离子的研究比较活跃．

Sorption behavior and mechanism of D201×4 resin for Au（Ⅲ） were investigated. D201×4 resin has a good adsorptivity for Au（Ⅲ） in HAc-NaAc medium at pH value of 2.63. The statically saturated Au（Ⅲ） sorption capacity was 689.11 mg·g^-1 resin. The Au（Ⅲ） adsorbed on D201×4 resin could be eluted by 10%NH2CSNH2-1 mol·L^-1 HCl （1：1） and the elution rate was 92.2%.The adsorption of Au（Ⅲ） on D201×4 follows the Freundlich isotherm. The AH of the adsorption was 11.03 kJ· mol^-1. The sorption rate constant was 5.42× 10^-5 s^-1. The activation energy was 13.26 kJ ·mol^-1. The molar coordination ratio of the functional group of D201×4 to Au（Ⅲ） was about hl. The adsorption mechanism of resin for Au（Ⅲ） was suggested according to chemical analysis and IR spectraoscopy results.