Photo- and chemocatalytic oxidation of dyes in water. (15th January 2018)

• Record Type: Journal Article
• Authors: Du, Wei-Ning; Chen, Shyi-Tien
• Is Part Of: Journal of environmental management. Volume 206(2018)
• Page Start: 507
• Page End: 515
• Publication Date: 2018-01-15
• Subjects: Dye oxidation -- Photocatalysis -- Chemocatalysis -- Titanium dioxide -- Hydrogen peroxide -- EDTA-Fe; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2017.10.042
• Languages: English
• ISSNs: 0301-4797

Abstract

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 (H2 O2 ) 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, H2 O2, 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. Highlights: Combination of TiO2, H2 O2, and EDTA-Fe for treatment of dyes. AR-111 and RB-5 dyes was sufficiently removed via a pseudo first-order model. Dual catalytic oxidative system is beneficial in treating dyeing wastewater.