CATALYTIC DEGRADATION OF METHYLENE BLUE BY NANOSTRUCTURED CrO(OH) PREPARED BY HYDROTHERMAL METHOD

Rafia Azmat, Ailiya Saeed

Abstract


Nano flat branched tube structure CrO(OH) (340-447 nm) demonstrated very good catalytic bustle in dye hazardous effluent treatment of textile industry. CrO(OH) Nanoparticles(NPs) have been synthesized using hydrothermal treatment of K2Cr2O7 in a mixed aqueous alcohol system. It was observed that solvent composition and the temperature exhibited imperative effects on the configuration of the end products. Conducting tests demonstrated that the single phase nano-branched particles can be synthesized at elevated reaction temperature and higher percent composition of ethanol with water (>50%). The experiment validates catalytic efficiency of the synthesized CrO(OH) NPs as a catalyst in oxidation of the basic dye methylene blue (MB).  Further, the impacts of other parameters were also investigated, including catalyst dosage, H2O2 dosage, catalyst circulation, concentration of dye and acidic media. After reaction of 30 minutes, degradation of methylene blue reached over 80% for most catalyst samples. Spectral analysis proposed that the degradation of MB followed by demethylation. It was observed that the catalytic activity was much advanced than that of the commercial potassium dichromate powder. Characterization of nanoparticle prepared was confirmed by EDS, SEM images and FTIR while effectiveness by UV-Visible spectroscopy.

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DOI: http://dx.doi.org/10.17628/ecb.2014.3.417-421

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