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Reversible ligand exchange of triphenylphosphine with thiols on gold nanoparticles for Janus modification and catalyst recycling

Lookup NU author(s): Dr Kui Zhang

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Abstract

© 2023 Elsevier B.V. Separation and regeneration of ultrafine catalysts in reaction system still remain challenging. In this study, we demonstrate a simple route to recycle gold nanoparticle (Au NP) catalysts by alternating surface wettability. Hydrophilic Au NPs protected with 3-mercapto-1,2-propanediol (MPD) were applied to catalyze the reduction of 4-nitrophenol (4-NP) using sodium borohydride as reductant, and were then separated from the suspension by interfacial ligand exchange with a toluene solution containing triphenylphosphine (TPP), led to amphiphilic Janus Au NPs with both MPD and TPP ligands at the toluene-water interface. The catalyst was regenerated by a reversible ligand exchange with a MPD aqueous solution. Experiments show that interfacial ligand exchange between phosphines and thiols on gold surface is reversible, although the forward and backward rates are different. As a result, the Au NP catalyst capped with MPD exhibited an excellent catalytic activity with an apparent rate constant (k) of 2.79 min−1, and the performance could be maintained for more than 10 regeneration cycles. The facile conversion between hydrophilic and amphiphilic Janus Au NPs provides a new pathway to explore monophasic and multiphasic reactions with convenient catalyst separation and regeneration.

Publication metadata

Author(s): Li D, Liu T, Luo Y, Zhuge X, Luo K, Luo Z, Liu X, Zhang K

Publication type: Article

Publication status: Published

Journal: Separation and Purification Technology

Year: 2023

Volume: 322

Print publication date: 01/10/2023

Online publication date: 23/05/2023

Acceptance date: 21/05/2023

ISSN (print): 1383-5866

ISSN (electronic): 1873-3794

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.seppur.2023.124154

DOI: 10.1016/j.seppur.2023.124154

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