ABSTRACT Gold and copper thiosulfate adsorption from an alkaline gold ore leachate was investigated by using polyethylenimine-coated iron oxide magnetic nanoparticles (NPs). The ore, sourced from a mine in Nevada, USA, was leached with calcium thiosulfate for 48 h in the presence of Cu(II) at a pH of 8 and a temperature of 50°C. A response surface methodology was used to analyze the effect of adsorbent dosage, adsorption time and solution temperature on the recovery of gold and copper from the solution. The results showed that the gold adsorption was nonlinearly dependent on the adsorbent dosage only. In contrast, the recovery of the copper depended on all three predictors, including interaction between the temperature and adsorbent dosage. The optimal conditions for maximal gold adsorption was 35 g/L adsorbent dosage, 55 min time and a temperature of 23°C. The selective elution of loaded metals on the NPs was also successfully achieved.

中文翻译：

---

使用功能化磁性纳米颗粒从金矿硫代硫酸盐浸出液中提取金和铜

摘要 通过使用聚乙烯亚胺包覆的氧化铁磁性纳米粒子 (NPs) 研究了从碱性金矿石浸出液中吸附金和硫代硫酸铜。该矿石来自美国内华达州的一个矿山，在存在 Cu(II) 的条件下，在 pH 值为 8 和温度为 50°C 的情况下，用硫代硫酸钙浸提 48 小时。采用响应面方法分析吸附剂用量、吸附时间和溶液温度对溶液中金和铜回收率的影响。结果表明，金吸附仅与吸附剂用量呈非线性关系。相比之下，铜的回收率取决于所有三个预测因素，包括温度和吸附剂剂量之间的相互作用。最大吸附金的最佳条件为 35 g/L 吸附剂用量，55 分钟的时间和 23°C 的温度。NPs 上负载金属的选择性洗脱也成功实现。