Synthesis and characterization of metal nanoparticles templated chitosan-SiO2 catalyst for the reduction of nitrophenols and dyes

Fayaz Ali; Sher Bahadar Khan; Tahseen Kamal; Khalid A Alamry; Esraa M Bakhsh; Abdullah M Asiri; Tariq R A Sobahi

doi:10.1016/j.carbpol.2018.03.029

Synthesis and characterization of metal nanoparticles templated chitosan-SiO₂ catalyst for the reduction of nitrophenols and dyes

Carbohydr Polym. 2018 Jul 15:192:217-230. doi: 10.1016/j.carbpol.2018.03.029. Epub 2018 Mar 14.

Authors

Fayaz Ali¹, Sher Bahadar Khan², Tahseen Kamal¹, Khalid A Alamry³, Esraa M Bakhsh³, Abdullah M Asiri¹, Tariq R A Sobahi³

Affiliations

¹ Center of Excellence for Advanced Materials Research, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia; Department of Chemistry, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia.
² Center of Excellence for Advanced Materials Research, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia; Department of Chemistry, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia. Electronic address: sbkhan@kau.edu.sa.
³ Department of Chemistry, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia.

PMID: 29691016
DOI: 10.1016/j.carbpol.2018.03.029

Abstract

Different metal nanoparticles (MNPs) templated on chitosan-silica (CH-SiO₂) nanocomposite fiber were prepared via simple and fast method of the metal ions uptake by fiber and their subseqent reduction using strong reducing agent. The performance difference of CH-SiO₂ templated with Cu, Co, Ag and Ni nanoparticles for both reduction of 4-nitroaniline (4-NA) and decolorization of congo red (CR) was investigated. The Cu nanoparticles loaded CH-SiO₂ (Cu/CH-SiO₂), showed high catalytic efficiencies in the reduction of 4-NA and CR, as compared to other loaded MNP fibers. The apparent rate constants of 6.17 × 10^-3 s^-1 and 1.68 × 10^-2 s^-1 and turnover frequencies (TOF) of 4.693 h^-1 and 3.965 h^-1 were observed for the reduction of 4-NA and CR, respectively. In addition, the catalytic activity of Cu/CH-SiO₂ catalyst was also examined and found efficient in the reduction of nitrophenols (2-NP, 3-NP and 4-NP), and other dyes. Thus, Cu/CH-SiO₂ with excellent catalytic activity can also be employed for other applications.

Keywords: Azo dyes; Chitosan; Metal nanoparticles; Nitrophenols; Reduction.