Issue 108, 2014

Synthesis and characterization of Co-NPAC and in situ hydroxyl radical generation for the oxidation of dye laden wastewater from the leather industry

Abstract

Cobalt oxide supported on nanoporous activated carbon (Co-NPAC) could be utilized as a catalyst in the heterogeneous Fenton oxidation of organic dye chemicals in tannery wastewater. The nanoporous activated carbon (NPAC) was prepared from rice husk by precarbonization followed by chemical activation at an elevated temperature. The Co-NPAC was characterized using UV-visible, fluorescence and FT-IR spectroscopy, as well as TEM, XRD, BET surface area and XPS analysis. The role of Co-NPAC in generating a hydroxyl radical from hydrogen peroxide was verified using Excitation Emission Spectroscopy (EES) with λexcitation and λemission at 320 nm and 450 nm, respectively. The parameters for the treatment of dye laden tannery wastewater, such as the dosage of Co-NPAC, concentration of H2O2, pH and temperature were optimized. The refractory organic compounds were estimated in terms of chemical oxygen demand (COD), and in tannery wastewater these were eliminated during the heterogeneous Fenton-like process by 78%. The characterization of the wastewater before and after heterogeneous Fenton oxidation was performed using UV-Visible spectroscopy, EES, and FT-IR spectroscopy. The Co-NPAC retained its catalytic activity for up to 5 cycles with the sustained generation of hydroxyl radicals.

Graphical abstract: Synthesis and characterization of Co-NPAC and in situ hydroxyl radical generation for the oxidation of dye laden wastewater from the leather industry

Supplementary files

Article information

Article type
Paper
Submitted
16 Sep 2014
Accepted
07 Nov 2014
First published
10 Nov 2014

RSC Adv., 2014,4, 63354-63366

Author version available

Synthesis and characterization of Co-NPAC and in situ hydroxyl radical generation for the oxidation of dye laden wastewater from the leather industry

S. Karthikeyan, R. B. Ahamed, M. Velan and G. Sekaran, RSC Adv., 2014, 4, 63354 DOI: 10.1039/C4RA10536B

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