National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang, 330063, PR China; Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang, 330063, PR China.
National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang, 330063, PR China; Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang, 330063, PR China.
Environ Res. 2022 Nov;214(Pt 3):113969. doi: 10.1016/j.envres.2022.113969. Epub 2022 Aug 7.
Supported-adsorbents growing on the substrate in situ are equipped with the advantages of high adsorption capacity, excellent regeneration performance, and adaptability to complex wastewater. However, the effects of substrate on the adsorption properties of supported-adsorbent are rarely considered, which will hinder its development and scale-up applications. In this study, the influences of different substrates (Ti, Mo, W, CC) on the Ag adsorption behavior of supported-MoS adsorbents were investigated. The adsorption kinetics, adsorption mechanism, and the renewability of these supported-MoS were compared orderly. As a result, MoS grown on a tungsten substrate (MoS-W) exhibits a remarkable adsorption capacity for Ag (1.98 mg cm and 598.80 mg g), which is 6.38-33 times more than the other three supported-MoS. Moreover, the MoS-W also possesses an ultrahigh distribution coefficient (24.80 mL cm) for Ag, and the selection coefficient can reach 1984. XRD and electrochemical characterization analysis indicated that Ag adsorption performance of supported-MoS is positively correlated with the degree of its amorphous structure. Substrate W with the terrific electrical properties which may facilitate the disordered growth of MoS, resulting in more active sites exposed, and endow MoS-W with outstanding Ag capture performance. Finally, the supported-MoS retains a high removal efficiency of Ag after 5 cycles of adsorption and desorption. This study provides a novel perspective for promoting the practical application of supported-sorbents to recycle heavy metals.
负载型吸附剂在载体上原位生长，具有吸附容量高、再生性能优异、适应复杂废水等优点。然而，载体对负载型吸附剂吸附性能的影响很少被考虑，这将阻碍其发展和规模化应用。在本研究中，考察了不同载体（Ti、Mo、W、CC）对负载型 MoS 吸附剂吸附 Ag 行为的影响。有序比较了这些负载型 MoS 的吸附动力学、吸附机制和可重复使用性。结果表明，负载在钨载体上的 MoS（MoS-W）对 Ag 具有显著的吸附能力（1.98 mg cm 和 598.80 mg g），是其他三种负载型 MoS 的 6.38-33 倍。此外，MoS-W 对 Ag 还具有超高的分配系数（24.80 mL cm），选择系数可达 1984。XRD 和电化学特性分析表明，负载型 MoS 的 Ag 吸附性能与其非晶态结构的程度呈正相关。具有优异导电性的载体 W 可能有利于 MoS 的无序生长，从而暴露出更多的活性位点，使 MoS-W 具有出色的 Ag 捕获性能。最后，负载型 MoS 在 5 次吸附和解吸循环后仍保持对 Ag 的高去除效率。本研究为促进负载型吸附剂在回收重金属方面的实际应用提供了新的视角。
