Current adsorbents for Au(III) recovery suffer from high costs, low adsorption capacity, recycling difficulty, as well as small-scale applications, making most of them have no commercialization potential. We report a complex adsorbent SA-TRF in this work. The aerogel made of sodium alginate (SA) serves as the carrier, and TRF resin (a resin composed of thiourea, resorcinol and formaldehyde) is used as the functional element. The thin-layered SA aerogel is evenly embedded with functionalized micron adsorbent (TRF) particles. Owing to the multiple functional groups of TRF, SA-TRF exhibited a high adsorption capacity. TRF was capable of making complete contact with Au (III) in the solution owing to the thin-layered SA aerogel. The SA aerogel's macrostructure makes it simple to collect SA-TRF in solution. The repeating unit of TRF's CS and NH functional groups were identified as being responsible for Au(III) binding, with its sulfhydryl functional group performing as the strongest binding site. The conveniently synthesized SA-TRF outperformed most other adsorbents and demonstrated significant adsorption capacity for Au (III) up to 600.2 mg/g in 70 mg/L Au-spiked water (corresponding removal efficiency is 85.7 %), which makes it particularly promising for industrial applications.

目前用于Au(III)回收的吸附剂存在成本高、吸附容量低、回收难度大、应用规模小等问题，大部分没有商业化潜力。我们在这项工作中报告了一种复杂的吸附剂 SA-TRF。以海藻酸钠（SA）制成的气凝胶作为载体，TRF树脂（一种由硫脲、间苯二酚和甲醛组成的树脂）作为功能元件。薄层 SA 气凝胶均匀嵌入功能化微米吸附剂 (TRF) 颗粒。由于 TRF 的多个官能团，SA-TRF 表现出高吸附能力。由于薄层 SA 气凝胶，TRF 能够与溶液中的 Au (III) 完全接触。SA 气凝胶的宏观结构使得在溶液中收集 SA-TRF 变得简单。TRF C 的重复单元S 和 NH 官能团被确定为负责 Au(III) 结合，其巯基官能团作为最强的结合位点。方便合成的 SA-TRF 优于大多数其他吸附剂，并且在 70 mg/L Au 加标水中表现出高达 600.2 mg/g 的 Au (III) 显着吸附能力（相应的去除效率为 85.7%），这使其特别有希望用于工业应用。