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Vol. 31 No. 1 (2019): Vol 31 Issue 1

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Poly(styrene) Beads Grafted with Dendrimer Stabilized Gold Nanoparticles for Catalytic Reduction of 4-Nitrophenol

https://doi.org/10.14233/ajchem.2019.21674
Paramasivam Shanmugam
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, P.R. China; Department of Chemistry, St. Joseph University, Dimapur-797115, India
Wei Wei
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, P.R. China; Center of Analysis and Test, Jiangsu University, Zhenjiang 212013, P.R. China
Jimin Xie
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, P.R. China
Eagambaram Murugan
Department of Physical Chemistry, School of Chemical Sciences, University of Madras, Chennai- 600025, India

Corresponding Author(s) : Jimin Xie

shanmugachem@gmail.com

Asian Journal of Chemistry, Vol. 31 No. 1 (2019): Vol 31 Issue 1

Abstract

Four types of new bead-shaped heterogeneous nanoparticle catalysts viz., polymer-supported poly(styrene) beads grafted with poly(propylene imine) dendrimer(G2) (PPI-G2) stabilized gold nanoparticles (AuNPs) viz., PS-PVBC-PPI(G2)-AuNPs-L & PS-P4VP-PPI(G2)-AuNPs-L and PSPVBC- PPI(G2)-AuNPs-H & PS-P4VP-PPI(G2)-AuNPs-H were prepared by varying the metal load 5.7 × 10-3 mM (low metal load -L) and 11.4 10-3 mM (high metal load -H) respectively. Initially, two different insoluble matrices including poly(styrene)-co-poly(vinylbenzyl chloride) (PS-PVBC) grafted with PPI(G2) and poly(styrene)-co-poly(4-vinylpyridine) (PS-P4VP) grafted with PPI(G2) dendrimer were prepared individually by suspension polymerization method and then the epoxy group was generated on both matrix via atom transfer radical polymerization (ATRP) and quaternization methods. The resulting matrixes grafted with PPI(G2) was stabilized individually with the addition of HAuCl4 and thus obtained four types of new heterogeneous nanoparticle catalysts. These catalysts were characterized with UV-visible, FTIR, SEM, HRTEM & EDS techniques and their catalytic potential were examined by reduction of 4-nitrophenol as a model reaction under pseudo first order reaction condition. The obtained rate constant (kobs) values revealed that the catalysts derived from ATRP method viz., PS-PVBC-PPI(G2)-AuNPs-H and PS-PVBC-PPI(G2)-AuNPs-L has shown 6 and 4 fold active than the catalysts derived from quaternized method viz., PS-P4VP-PPI(G2)-AuNPs-H and PS-P4VPPPI( G2)-AuNPs-L respectively. The reusability of the superior catalyst was verified for the same reaction and proved the activity was sustained up to fourth cycle.

Keywords

Polymer beads Atom transfer radical polymerization Heterogeneous nanoparticles Dendrimer 4-Nitrophenol
Shanmugam, P., Wei, W., Xie, J., & Murugan, E. (2018). Poly(styrene) Beads Grafted with Dendrimer Stabilized Gold Nanoparticles for Catalytic Reduction of 4-Nitrophenol. Asian Journal of Chemistry, 31(1), 235–246. https://doi.org/10.14233/ajchem.2019.21674
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