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DOI: https://doi.org/10.4491/eer.2018.322
A new nano-ZnO/perlite as an efficient catalyst for catalytic ozonation of azo dye
Soheila Shokrollahzadeh, Masoud Abassi, and Maryam Ranjbar
Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), P.O. Box 33535-111, Tehran, Iran
Corresponding Author: Soheila Shokrollahzadeh ,Tel: +98-21-56276637 , Fax: +98-21-56276265, Email: shokrollahzadeh@irost.ir
Received: September 10, 2018;  Accepted: November 10, 2018.
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ABSTRACT
In this investigation, nano ZnO was sonochemically synthesized by a novel method using a methionine precursor. A narrow size distribution (41-50 nm) of nano ZnO was achieved that was immobilized on perlite and applied as a catalyst in catalytic ozonation. The catalyst was characterized by fourier transform infrared spectroscopy, BET surface area, and field emission scanning electron microscope. The ozonation of recalcitrant Remazol black 5 (RB5) di-azo dye solution by means of the synthesized catalyst was investigated in a bubble column slurry reactor. The influence of pH values (7, 9, 11), catalyst dosage (8, 12, 15, 20 g L−1) and reaction time (10, 20, 30, 60 min) was investigated. Although the dye color was completely removed by single ozonation at a higher reaction time, the applied nanocatalyst improved the dye declorination kinetics. Also, the degradation of the hazardous aromatic fraction of the dye was enhanced five-times by catalytic ozonation at a low reaction time (10 min) and a neutral pH. The second-order kinetics was best fitted in terms of both RB5 color and its aromatic fraction removal. The total organic carbon analysis indicated a significant improvement in the mineralization of RB5 by catalytic ozonation using the nano-ZnO/perlite catalyst.
Keywords: Catalytic ozonation | Kinetics | Mineralization | Nano ZnO/Perlite catalyst | Remazol black 5
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