Influence of parameters and radical scavengers on the visible-light-induced degradation of ciprofloxacin in ZnO/SnS2 nanocomposite suspension: Identification of transformation products

A B Makama; A Salmiaton; T S Y Choong; M R A Hamid; N Abdullah; E Saion

doi:10.1016/j.chemosphere.2020.126689

Influence of parameters and radical scavengers on the visible-light-induced degradation of ciprofloxacin in ZnO/SnS₂ nanocomposite suspension: Identification of transformation products

Chemosphere. 2020 Aug:253:126689. doi: 10.1016/j.chemosphere.2020.126689. Epub 2020 Apr 10.

Authors

A B Makama¹, A Salmiaton², T S Y Choong³, M R A Hamid³, N Abdullah³, E Saion⁴

Affiliations

¹ Department of Chemical Engineering Technology, The Federal Polytechnic, Nasarawa, P.O. Box 01, 962101, Nigeria.
² Sustainable Process Engineering Research Centre, Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor Darul Ehsan, Malaysia. Electronic address: mie@upm.edu.my.
³ Sustainable Process Engineering Research Centre, Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor Darul Ehsan, Malaysia.
⁴ Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Darul Ehsan, Malaysia.

PMID: 32304862
DOI: 10.1016/j.chemosphere.2020.126689

Abstract

Removal of ciprofloxacin (CIP) pollutant from wastewater using conventional process is particularly challenging due to poor removal efficiency. In this work, CIP was photocatalytically degraded using a porous ZnO/SnS₂ photocatalyst prepared via microwaves. The influence of process parameters (e.g., pH, catalyst mass and initial CIP concentration) and radical scavengers on visible-light induced degradation of CIP on the catalyst was investigated. From the study, it was found that visible-light induced degradation of CIP on ZnO/SnS₂ is a surface-mediated process and the reaction kinetics followed the Langmuir-Hinshelwood first-order kinetics. It was found that the optimum condition for CIP degradation was at pH of 6.1 and catalyst dosage of 500 mg L^-1. Higher catalyst dosage however led to a decline in reaction rate due to light scattering effect and reduction in light penetration.

Keywords: Ciprofloxacin; Photocatalysis; Transformation products; Visible-light; ZnO/SnS(2).

MeSH terms

Catalysis
Ciprofloxacin / chemistry*
Kinetics
Light
Models, Chemical*
Nanocomposites
Suspensions
Zinc Oxide

Substances

Suspensions
Ciprofloxacin
Zinc Oxide