Boosting catalytic activity of metal nanoparticles for 4-nitrophenol reduction: Modification of metal naoparticles with poly(diallyldimethylammonium chloride)

Jyun-Guo You; Chandirasekar Shanmugam; Yao-Wen Liu; Cheng-Ju Yu; Wei-Lung Tseng

doi:10.1016/j.jhazmat.2016.11.007

Boosting catalytic activity of metal nanoparticles for 4-nitrophenol reduction: Modification of metal naoparticles with poly(diallyldimethylammonium chloride)

J Hazard Mater. 2017 Feb 15;324(Pt B):420-427. doi: 10.1016/j.jhazmat.2016.11.007. Epub 2016 Nov 3.

Authors

Jyun-Guo You¹, Chandirasekar Shanmugam¹, Yao-Wen Liu², Cheng-Ju Yu², Wei-Lung Tseng³

Affiliations

¹ Department of Chemistry, National Sun Yat-sen University, Taiwan.
² Department of Applied Physics and Chemistry, University of Taipei, Taiwan.
³ Department of Chemistry, National Sun Yat-sen University, Taiwan; School of Pharmacy, College of Pharmacy, Kaohsiung Medical University, Taiwan; Center for Nanoscience and Nanotechnology, National Sun Yat-sen University, Taiwan. Electronic address: tsengwl@mail.nsysu.edu.tw.

PMID: 27856049
DOI: 10.1016/j.jhazmat.2016.11.007

Abstract

Most of the previously reported studies have focused on the change in the size, morphology, and composition of metal nanocatalysts for improving their catalytic activity. Herein, we report poly(diallyldimethylammonium chloride) [PDDA]-stabilized nanoparticles (NPs) of platinum (Pt) and palladium (Pd) as highly active and efficient catalysts for hydrogenation of 4-nitrophenol (4-NP) in the presence of NaBH4. PDDA-stabilized Pt and Pd NPs possessed similar particle size and same facet with citrate-capped Pt and Pd NPs, making this study to investigate the inter-relationship between catalytic activity and surface ligand without the consideration of the effects of particle size and facet. Compared to citrate-capped Pt and Pd NPs, PDDA-stabilized Pt and Pd NPs exhibited excellent pH and salt stability. PDDA could serve as an electron acceptor for metal NPs to produce the net positive charges on the metal surface, which provide strong electrostatic attraction with negatively charged nitrophenolate and borohydride ions. The activity parameter and rate constant of PDDA-stabilized metal NPs were higher than those of citrate-capped metal NPs. Compared to the previously reported Pd nanomaterials for the catalysis of NaBH4-mediated reduction of 4-NP, PDDA-stabilized Pd NPs exhibited the extremely high activity parameter (195s^-1g^-1) and provided excellent scalability and reusability.

Keywords: 4-nitrophenol; Citrate; Metal nanoparticles; Poly(diallyldimethylammonium chloride).