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首页> 外文期刊>Applied biochemistry and biotechnology, Part A. enzyme engineering and biotechnology >Recovery and refining of Au by gold-cyanide ion biosorption using animal fibrous proteins
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Recovery and refining of Au by gold-cyanide ion biosorption using animal fibrous proteins

机译：使用动物纤维蛋白通过氰化金离子生物吸附法回收和精制金

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摘要

Animal fibrous proteins (AFPs) such as egg-shell membrane (ESM), chicken feather (CF), wool, silk, or elastin are an intricate network of stable and water-insoluble fibers with high surface area and are abundant bioresources. Every AFP tested was found to accumulate gold-cyanide ion from aqueous solutions in high yield, depending on pH and some other parameters. Gold-cyanide ion is adsorbed by AFP at low pH range, with maximum binding observed at approx pH 2.0. Under the certain conditions, gold-cyanide ion was accumulated up to 8.6, 7.1, 9.8, 2.4, and 3.9% of dry weight on ESM, CF, wool, silk, and elastin, respectively. Ln the case of ESM, it was found that ESM removed gold-cyanide ion almost quantitatively and almost all the gold uptake by ESM was easily desorbed with 0.1 M NaOH. ESM can be used repeatedly for the process of gold adsorption-desorption. The gold-biosorptive capacity of ESM that was chemically modified with glutaraldehyde was higher than that of control. In column procedure, ESM packed on column removed gold-cyanide ion from the dilute aqueous solution to extremely low concentrations (nondetectable concentration of below 1 ppb). [References: 17]
机译：动物纤维蛋白（AFP），例如蛋壳膜（ESM），鸡羽毛（CF），羊毛，丝绸或弹性蛋白，是由高表面积的稳定且不溶于水的纤维组成的复杂网络，是丰富的生物资源。发现每个测试的AFP都可以根据pH和其他一些参数以高收率从水溶液中积累氰化金离子。氰化金离子在低pH范围内被AFP吸附，在约pH 2.0时观察到最大结合。在某些条件下，氰化金离子分别在ESM，CF，羊毛，丝绸和弹性蛋白上的干重分别高达8.6％，7.1％，9.8％，2.4％和3.9％。在ESM的情况下，发现ESM几乎定量地去除了氰化金离子，几乎所有ESM吸收的金都易于用0.1 M NaOH解吸。 ESM可重复用于金的吸附-解吸过程。戊二醛化学修饰的ESM的金吸附能力高于对照。在色谱柱程序中，填充在色谱柱上的ESM将稀水溶液中的氰化金离子去除到极低的浓度（不可检测的浓度低于1 ppb）。 [参考：17]

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