Photo- and chemocatalytic oxidation of dyes in water

Wei-Ning Du; Shyi-Tien Chen

doi:10.1016/j.jenvman.2017.10.042

Photo- and chemocatalytic oxidation of dyes in water

J Environ Manage. 2018 Jan 15:206:507-515. doi: 10.1016/j.jenvman.2017.10.042. Epub 2017 Nov 8.

Authors

Wei-Ning Du¹, Shyi-Tien Chen²

Affiliations

¹ Department of Safety, Health and Environmental Engineering, National Kaohsiung First University of Science and Technology, Taiwan. Electronic address: Frank911zoe@yahoo.com.tw.
² Department of Safety, Health and Environmental Engineering, National Kaohsiung First University of Science and Technology, Taiwan. Electronic address: shyitien@nkfust.edu.tw.

PMID: 29127922
DOI: 10.1016/j.jenvman.2017.10.042

Abstract

Three commonly used dyes, Acid Red-114 (AR-114), Reactive Black-5 (RB-5), and Disperse Black EX-SF (DB-EX-SF), were treated in a pH-neutral liquid with ultraviolet (UV) light by two reactive methods: photocatalysis with titanium dioxide (TiO₂), and/or chemocatalysis with hydrogen peroxide (H₂O₂) as the oxidant and various ferrous-based electron mediators as catalysts. Important factors for dye oxidation were determined through bifactorial experiments. The optimum combinations and doses of the three key reagents, namely TiO₂, H₂O₂, and EDTA-Fe, were also determined. The degradation kinetics of the studied dyes at their optimum doses reveal that the oxidation reactions are pseudo-first-order in nature, and that certain dyes are selectively degraded more by one method than the other. The overall results suggest that co-treatment using more than one oxidative method is beneficial for the treatment of wastewater from dyeing processes.

Keywords: Chemocatalysis; Dye oxidation; EDTA-Fe; Hydrogen peroxide; Photocatalysis; Titanium dioxide.

MeSH terms

Coloring Agents*
Hydrogen Peroxide*
Kinetics
Oxidation-Reduction
Titanium
Ultraviolet Rays
Water
Water Pollutants, Chemical*
Water Purification*

Substances

Coloring Agents
Water Pollutants, Chemical
Water
Hydrogen Peroxide
Titanium