MXene-Carbon Nanotube Hybrid Membrane for Robust Recovery of Au from Trace-Level Solution.,ACS Applied Materials & Interfaces

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MXene-Carbon Nanotube Hybrid Membrane for Robust Recovery of Au from Trace-Level Solution.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-08-28 , DOI: 10.1021/acsami.0c09310
Chunmei Wang _{1,

2} , Renfei Cheng _{1,

2} , Peng-Xiang Hou _{1,

2} , Yonghui Ma ₁ , Abdul Majeed ₁ , Xiaohui Wang _{1,

2} , Chang Liu _{1,

2}

Affiliation

The use of precious metals in many areas, such as printed circuit boards, catalysts, and targeted drugs, is increasing due to their unique physical and chemical properties, but their recovery remains a great challenge. Here, we report a sandwiched Ti₃C₂T_x MXene/carbon nanotube (CNT) hybrid membrane, where the CNT isolates and supports the MXene sheets, which act as a reducing agent. The hybrid membrane shows excellent ability to capture precious metal ions in solution with a high flux. The water permeability of the membrane reaches 437.6 L m^–2 h^–1 bar^–1 (2.46 × 10^–18 m²), about 202 times higher than that of a pure Ti₃C₂T_x membrane, and captures 99.8% Au(III) from a solution with an extremely low concentration of 20 ppm. The desirable precious metal trapping capability of the Ti₃C₂T_x–CNT film is due to the high redox activity of C–Ti–OH. This work provides an efficient way for the recovery of precious metal ions from wastewater.

中文翻译：

MXene-碳纳米管混合膜，用于从痕量溶液中稳定回收金。

由于其独特的物理和化学特性，贵金属在许多领域（例如印刷电路板，催化剂和靶向药物）的使用正在增加，但其回收仍然是巨大的挑战。在这里，我们报告夹心的Ti ₃ C ₂T _x MXene /碳纳米管（CNT）混合膜，其中CNT隔离并支撑MXene片，后者充当还原剂。杂化膜具有出色的捕获高通量溶液中贵金属离子的能力。膜的透水性达到437.6 L m ^–2 h ^–1 bar ^–1（2.46×10 ^–18 m ²），比纯Ti _3的透水率高202倍C ₂T _x膜，并从浓度极低的20 ppm的溶液中捕获99.8％的Au（III）。Ti ₃ C ₂T _x –CNT薄膜理想的贵金属捕获能力是由于C–Ti–OH的高氧化还原活性所致。这项工作提供了一种从废水中回收贵金属离子的有效方法。

更新日期：2020-09-23

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