Redox-Active Nanohybrid Filter for Selective Recovery of Gold from Water,ACS ES&T Engineering

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Redox-Active Nanohybrid Filter for Selective Recovery of Gold from Water
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2021-06-17 , DOI: 10.1021/acsestengg.1c00158
Fuqiang Liu ₁ , Shijie You ₂ , Zhongying Wang ₃ , Yanbiao Liu _{1,

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Affiliation

There is an increasing demand for the recovery of noble metals with high added value from complex matrices. Traditional strategies reported to date usually require toxic chemicals and complicated operation under extreme extraction conditions. With the aim of achieving effective and selective recovery of trace amounts of Au from water, herein, we developed a functional redox-active nanohybrid filter consisting of carbon nanotube (CNT) and three-dimensional molybdenum disulfide (MoS₂) nanoflowers. The CNT-MoS₂ nanohybrid filter demonstrated an ultrahigh recovery capacity of 2495 mg/g toward Au(III) which could be attributed to its sufficient exposed active sites, excellent stability, flow-through design, and redox-active capability. Extensive experimental studies and advanced characterizations confirmed that the recovery mechanism of Au(III) involved a two-step adsorption–reduction process between Au(III) and the MoS₂ nanoflowers. Au(III) was first adsorbed by chelation to the S atoms of the MoS₂ moiety and then spontaneously reduced to Au(0) via electron capture from Mo(IV). Notably, thanks to the high affinity with a binding energy of −1.523 eV for Au(III), the CNT-MoS₂ nanohybrid filter exhibited superior selectivity (distribution coefficient of 5.6 × 10⁵ mL/g) in the presence of several common anions and cations or even in actual Au(III)-containing industrial wastewater. This study provides a proof-of-concept demonstration of a redox-active nanohybrid filter for extracting noble metal from complex wastewater.

中文翻译：

用于从水中选择性回收金的氧化还原活性纳米混合过滤器

从复杂基质中回收具有高附加值的贵金属的需求不断增加。迄今为止报道的传统策略通常需要在极端提取条件下使用有毒化学品和复杂的操作。为了实现从水中有效和选择性地回收痕量 Au，我们开发了一种功能性氧化还原活性纳米杂化过滤器，由碳纳米管 (CNT) 和三维二硫化钼 (MoS ₂ ) 纳米花组成。CNT-MoS ₂纳米混合过滤器对 Au(III) 具有 2495 mg/g 的超高回收能力，这可归因于其足够的暴露活性位点、出色的稳定性、流通设计和氧化还原活性能力。大量的实验研究和先进的表征证实，Au(III) 的回收机制涉及 Au(III) 和 MoS ₂纳米花之间的两步吸附-还原过程。Au(III)首先通过螯合吸附到MoS ₂部分的S原子上，然后通过Mo(IV)的电子捕获自发还原为Au(0)。值得注意的是，由于对 Au(III) 的结合能为 -1.523 eV 的高亲和力，CNT-MoS ₂纳米杂化过滤器表现出优异的选择性（分布系数为 5.6 × 10⁵ mL/g) 存在几种常见的阴离子和阳离子，甚至在实际含 Au(III) 的工业废水中。该研究提供了用于从复杂废水中提取贵金属的氧化还原活性纳米混合过滤器的概念验证演示。

更新日期：2021-06-17

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