Yang Y, Wang H, Qin W, Guo Y, Yao H, Li J, Shi K, Ma S. MoS
2/Au
0/N-CNT derived from Au(III) extraction by polypyrrole/MoS
4 as an electrocatalyst for hydrogen evolution reaction.
J Colloid Interface Sci 2020;
561:298-306. [PMID:
31732147 DOI:
10.1016/j.jcis.2019.10.102]
[Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 10/21/2019] [Accepted: 10/27/2019] [Indexed: 10/25/2022]
Abstract
The nanotube type MoS42-/polypyrrole (MoS4-Ppy) is newly synthesized which exhibits exceptional uptake capability for Au(III) with a high removal rate of >99.99% and large Kd of >107 mL/g. Through simple calcination, the Au-loaded MoS4-Ppy is successfully converted to nitrogen-doped carbon nanotubes (N-CNT) decorated with MoS2 nanosheets as well as Au0 nanoparticles, forming a novel composite of MoS2/Au0/N-CNT. The conductivity of MoS2/Au/N-CNT is substantially improved by the highly conductive N-CNT and Au0 metal. In addition, the N-CNT can effectively eliminate the aggregation of MoS2 sheets and Au0 particles, thus endowing more exposed active sites. The optimized MoS2/Au0/N-CNT displays good electrocatalytic performance towards hydrogen evolution reaction (HER). For the first time, we demonstrate the MoS4-Ppy is a promising material for efficient extraction and recovery of trace amounts of precious metal Au from gold-bearing leachates, and the subsequent product MoS2/Au/N-CNT can act as an effective HER electrocatalyst. The fabrication process of the composite material can not only remediate water contamination but also reuse precious metals. This dual-use approach opens a new way to explore effective sorbents for recovery of trace of gold and apply them in catalysis and sensing fields.
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