Birnessite nanorod-mediated decomposition of methylene blue with common oxidants

R Kannan,S Vasanthkumar,K Govindan,P Ravichandiran,S Selvaraj

doi:10.1007/s13201-012-0058-x

R Kannan, S Vasanthkumar + Show 3 more

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https://doi.org/10.1007/s13201-012-0058-x

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Journal: Applied Water Science	Publication Date: Oct 20, 2012
Citations: 5	License type: cc-by

Affiliation: Karunya University

Abstract

In this paper, the birnessite nanorods (BN) were synthesized by microwave-assisted hydrothermal method and was characterized by powder X-ray diffraction measurements (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDX), and surface area (BET) analyzer. These results confirm the formation of birnessite nanorods. The catalytic decomposition profile of methylene blue by birnessite nanorods was tested. The effect of oxidants peroxomonosulfate (PMS) and peroxodisulfate (PDS) was compared with hydrogen peroxide (H2O2). Among these oxidants, PDS exhibits a high degree of decomposition of more than 80 % mineralization, achieved in 4 h when compared to PMS and H2O2. The decomposition was examined using varying amount of catalyst, which showed the dye decomposition activity to be proportional to the amount of the catalyst. The powder XRD studies showed no changes in the structure of birnessite nanorods, implying that these reactions are surface controlled.

Highlights

Decolorization of synthetic dyes attracted considerable attention in the past two decades
In situ chemical oxidation (ISCO), the category of AOPs has been identified as offering techniques with potential application for the removal of color
The FTIR spectra recorded for the birnessite nanorods (BN) material show significant IR signals at 3,384 and at 1,597 cm-1 corresponding to the O–Hstr, and O–Hbending frequencies, respectively

Summary

Introduction

Decolorization of synthetic dyes attracted considerable attention in the past two decades. The effect of oxidants peroxomonosulfate (PMS) and peroxodisulfate (PDS) was compared with hydrogen peroxide (H2O2). Sulfate radical (SO3Á2-)-based AOPs, in which PMS or PDS is used as a strong oxidant that can attack most of the organic compounds present in wastewater (Furman et al 2009, 2010; Kitajima et al 1978; Zhou et al 1998; Watts and Teel 2006).

Results

Conclusion