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Thiol-functionalized chitosan poly(protic ionic liquids) hydrogel selectively anchors gold nanoparticles for aqueous catalysis

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Abstract

Well-dispersed gold nanoparticles (Au NPs) anchored by polymeric three-dimensional hydrogels for catalysis have received great attention, especially in aqueous-phase catalysis. In this study, thiol-functionalized chitosan poly(protic ionic liquids) hydrogel (TCPPILH) is delicately designed and prepared as a selective support material to anchor Au NPs by taking advantages of Au-thiol chemistry and facile preparation of protic ionic liquids (PILs). The TCPPILH was successfully synthesized by a protonation reaction of chitosan with 3-mercaptopropionic acid (MPA) and mercaptosuccinic acid (MSA) in water, and followed by shaping in ethanol coagulation bath via solution-gelation transition, and the properties can be facilely adjusted by changing the feed ratio of MPA and MSA. It is found that the TCPPILH can act as a selective support for adsorption of Au3+ ions, and a maximal anchoring capacity for Au NPs could reach up to 151.5 mg/g. The as-prepared TCPPILH@Au NPs catalysts were systematically characterized by FTIR, XPS, SEM, TEM, XRD and ICP-OES analysis, and the findings demonstrated that the TCPPILH could effectively inhibit the agglomeration of Au NPs (ca. 4.20 nm in diameter). As a proof of concept, hydrogenation of water pollutes, such as 4-nitrophenol and azo dyes with NaBH4 as reductant was selected as model applications, and the results indicated that TCPPILH@Au NPs catalysts exhibited high catalytic activity and satisfactory reusability.

Graphical abstract

Thiol-functionalized chitosan poly(protic ionic liquids) hydrogel (TCPPILH) was delicately designed and prepared as a selective support material to adsorb Au3+ and anchoring Au NPs by taking advantages of Au-thiol chemistry and facile preparation of protic ionic liquids (PILs). This TCPPILH@Au NPs catalysts exhibited desired catalytic activity for the hydrogenation of 4-nitrophenol and azo dyes in water.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (51803038, 22065007, 21774028); Science and Technology Department of Guizhou Province (Natural Science Key Fund ZK[2021]023; Platform & Talents [2016]5652, [2017]5788, [2018]5781 and [2019]5607); Science and Technology Department of Guizhou Province & Guizhou University Joint Fund ([2017]7249); and Talent Introduction Program of Guizhou University ([2017]08).

Funding

This work was financially supported by the National Natural Science Foundation of China (51803038, 22065007, 21774028); Science and Technology Department of Guizhou Province (Natural Science Key Fund ZK[2021]023; Platform & Talents [2016]5652, [2017]5788, [2018]5781 and [2019]5607); Science and Technology Department of Guizhou Province & Guizhou University Joint Fund ([2017]7249); and Talent Introduction Program of Guizhou University ([2017]08).

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LZ: Conceptualization, Investigation, Methodology, Writing–original draft, Funding acquisition. SF: Investigation. FH: Investigation. BL: Investigation. YL: Writing–review & editing. HS: Investigation. LH: Writing review & editing. SL: Writing–review & editing. HX: Conceptualization, Supervision, Project administration, Funding acquisition, Writing–review & editing. All authors reviewed the manuscript.

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Correspondence to Haibo Xie.

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Zhang, L., Feng, S., Huang, F. et al. Thiol-functionalized chitosan poly(protic ionic liquids) hydrogel selectively anchors gold nanoparticles for aqueous catalysis. Cellulose 30, 3837–3852 (2023). https://doi.org/10.1007/s10570-023-05126-7

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