Comparative performance of anodic oxidation and electrocoagulation as clean processes for electrocatalytic degradation of diazo dye Acid Brown 14 in aqueous medium

D G Bassyouni; H A Hamad; E-S Z El-Ashtoukhy; N K Amin; M M Abd El-Latif

doi:10.1016/j.jhazmat.2017.04.045

Comparative performance of anodic oxidation and electrocoagulation as clean processes for electrocatalytic degradation of diazo dye Acid Brown 14 in aqueous medium

J Hazard Mater. 2017 Aug 5:335:178-187. doi: 10.1016/j.jhazmat.2017.04.045. Epub 2017 Apr 21.

Authors

D G Bassyouni¹, H A Hamad², E-S Z El-Ashtoukhy³, N K Amin³, M M Abd El-Latif⁴

Affiliations

¹ Fabrication Technology Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technology Applications (SRTA-City), Alexandria, 21934, Egypt. Electronic address: engdodo200712@yahoo.com.
² Fabrication Technology Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technology Applications (SRTA-City), Alexandria, 21934, Egypt. Electronic address: heshamaterials@hotmail.com.
³ Chemical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, 21544, Egypt.
⁴ Fabrication Technology Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technology Applications (SRTA-City), Alexandria, 21934, Egypt.

PMID: 28458079
DOI: 10.1016/j.jhazmat.2017.04.045

Abstract

In this study, a laboratory scale for the treatment of a recalcitrant and toxic synthetic wastewater containing diazo dye, acid brown 14 (AB-14) has been comparatively performed by two electro-catalytic treatment processes, namely anodic oxidation (AO) and electrocoagulation (EC) using a new batch electrochemical cell. Additionally, the influence of several operating parameters such as; current density (j), initial dye concentration (C_o), NaCl concentration (C_N), and pH on the color removal efficiency and chemical oxygen demand (COD) are evaluated. The powerful capability of the AO and EC of AB-14 which related to the mechanistic reaction pathway is shown. The poor degradation is ascribed to higher C_o and pH, while the enhancement of j and C_N is responsible for better degradation of AB-14 dye. The results indicate that the EC is more effective than AO under the same operational condition. A kinetic model is developed for evaluation of the pseudo-first-order-rate constant (k_app) as a function of various operational parameters. The results emphasize the high efficiency of AO and EC and the clean processes which are hopeful alternative for the treatment of the large volume wastewater of the textile industry.

Keywords: COD reduction; Clean processes; Diazo anionic dye; Electro-oxidation; Electrocoagulation; Kinetics.