Hao Fulai, Du Jifu, Peng Lifang, Zhang Manman, Dong Zhen, Shen Yanbai, Zhao Long
School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China.
Changchun Gold Research Institute, China National Gold Group Co., Ltd., Changchun 130012, China.
Polymers (Basel). 2023 Jan 8;15(2):321. doi: 10.3390/polym15020321.
The hydrometallurgical recovery of gold from electronic waste and gold slag is a hot research topic. To develop a cost-effective and environmentally friendly adsorbent for gold recovery, four types of amino-acid (arginine, histidine, methionine, and cysteine)-functionalized cellulose microspheres were prepared via a radiation technique. The adsorption performance of the amino acid resins toward Au(III) ions was systematically investigated by batch experiments. The amino acid resins could absorb Au(III) ions at a wide pH range. The adsorption process was followed by the pseudo-second-order model and Langmuir model. The theoretical maximum adsorption capacity was calculated as 396.83 mg/g, 769.23 mg/g, 549.45 mg/g, and 636.94 mg/g for ArgR, HisR, MetR, and CysR, respectively. The amino acid resins could effectively and selectively recover trace Au(III) ions from the leaching solutions of printed circuit board and gold slag waste. Lastly, the mechanism underlying amino acid resin's Au(III) ion recovery capability was investigated by FTIR, XRD, and XPS analyses. This work describes a series of cost-effective gold adsorbents with excellent selectivity and adsorption capacity to boost their practical application.
从电子废弃物和金渣中湿法冶金回收金是一个热门研究课题。为开发一种经济高效且环境友好的金回收吸附剂，通过辐射技术制备了四种氨基酸（精氨酸、组氨酸、蛋氨酸和半胱氨酸）功能化的纤维素微球。采用分批实验系统研究了氨基酸树脂对Au(III)离子的吸附性能。氨基酸树脂能在较宽的pH范围内吸附Au(III)离子。吸附过程符合准二级模型和朗缪尔模型。计算得出，ArgR、HisR、MetR和CysR对Au(III)离子的理论最大吸附容量分别为396.83 mg/g、769.23 mg/g、549.45 mg/g和636.94 mg/g。氨基酸树脂能够从印刷电路板和金渣废弃物的浸出液中有效且选择性地回收痕量Au(III)离子。最后，通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和X射线光电子能谱（XPS）分析研究了氨基酸树脂回收Au(III)离子能力的作用机制。本文介绍了一系列具有优异选择性和吸附容量的经济高效金吸附剂，以促进其实际应用。
