Fabrication and characterization of amidoxime-functionalized silica decorated with copper: a catalytic assembly for rapid reduction of dyes

Ijaz Ahmed Khan; Muhammad Inaam Ul Hassan; Hazrat Hussain; Syed Mujtaba Shah; Tariq Yasin

doi:10.3906/kim-2007-49

Fabrication and characterization of amidoxime-functionalized silica decorated with copper: a catalytic assembly for rapid reduction of dyes

Turk J Chem. 2021 Apr 28;45(2):410-419. doi: 10.3906/kim-2007-49. eCollection 2021.

Authors

Ijaz Ahmed Khan^{1

2

3}, Muhammad Inaam Ul Hassan², Hazrat Hussain¹, Syed Mujtaba Shah¹, Tariq Yasin²

Affiliations

¹ Department of Chemistry, Quaid-i-Azam University, Islamabad Pakistan.
² Department of Chemistry, Pakistan Institute of Engineering and Applied Sciences, Islamabad Pakistan.
³ Department of Chemistry, Women University of Azad Jammu & Kashmir, Bagh Pakistan.

Abstract

In this study, amidoxime-functionalized silica decorated with copper (AFS-Cu) was fabricated and tested for its catalytic application. Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction were employed to characterize its structure and morphology. The application of AFS-Cu as a catalyst for the catalytic reduction of methylene blue (MB) in aqueous media using NaBH₄ as reductant was evaluated. The ability to reuse as well as the effect of catalyst dose and pH of solution on the catalytic activity was investigated. The reduction of MB followed pseudo-first-order kinetics and the rate constant (k) was 0.6224 min^-1. AFS-Cu was found to be a highly effective catalyst for MB reduction reaction and can be easily recovered and reused several times with no appreciable loss of catalytic activity.

Keywords: adsorption; composites; degradation; grafting; Catalyst.