A Hybrid Approach: Indirect Electro-Oxidation Followed by In Situ Electrogeneration of H2O2 in Real Textile Effluent

Priyadharshini Aravind, Rajeswari Selvaraj, Angappan Sankarmahalingam, Subramanian Kandasamy

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

A two-step treatment process has been investigated for effective textile effluent management. In step I, the effluent was decolorized via chlorine-mediated indirect electrooxidation (InDEO), while H2O2 was electrogenerated during step II in the decolorized textile effluent, by employing an H-type divided electrochemical cell. The native salts present within the decolorized textile effluent (9.4g/L Na2SO4 and 0.8g/L NaCl) were exploited as electrolytes for the catholyte, whereas 0.5N sulfuric acid was used as the anolyte for the in situ electrochemical generation of H2O2. During the cyclic voltammetry tests, O2 reduction at the activated carbon felt cathode was observed around -0.86V versus saturated calomel electrode (SCE) at a scan rate of 100mV/s. Under optimized conditions (cathode potential of -0.9V vs. SCE and catholyte at pH 6) about 1.45±0.01mM H2O2 have been generated. The effluent containing H2O2 was subjected to Fenton reaction and the generation of OH radicals was confirmed by electron paramagnetic resonance spectroscopy. The results indicated a 59% reduction of the chemical oxygen demand, significant modifications of the functional groups were observed by Fourier transform IR spectroscopy. High performance LC analysis confirmed the degradation of the organic compounds during the oxidative treatment process. These findings suggest the application of this method for degradation of highly colored textile effluents.

Original languageEnglish
Pages (from-to)362-370
Number of pages9
JournalClean - Soil, Air, Water
Volume44
Issue number4
DOIs
StatePublished - 1 Apr 2016
Externally publishedYes

Keywords

  • Activated carbon felt electrode
  • Dye wastewater
  • Hydrogen peroxide
  • Hypochlorite ions
  • InDEO

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology
  • Pollution

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