Decolorization of Reactive Orange 16 and Reactive Black 5 in aqueous solution by ozonation

Year 2018, Volume: 1 Issue: 4, 6 - 13, 01.12.2018

İrem Onder Okan Aydin Afife Guvenc

Abstract

Textile
industry is one of the most chemically intensive industries on Earth and the
major polluter of potable water. There are many methods for dye removal in the
textile industry. One of the most effective methods is colour removal by
ozonation. The application of ozonation has increased in recent years.
Preference of the ozonation method is the efficiency of colour removal and the
short application time. In ozonation process, not only colour but also the
toxicity caused by products of treated wastewater is important. So, suitable
ozonation period must be obtained. The aim of this study is the removal of
Reactive Black 5 (RB-5) and Reactive Orange 16 (RO-16) from the synthetic
aqueous solution by ozonation. In this study, dye removal (%) and chemical oxygen
demand (COD) removal (%) were determined and carried out by kinetic analyzing.
The maximum dye removals were 99.9 % and 99 % at all pH values in initial dye
concentration of 100 mg L^-1 for RB-5 (40 min) and RO-16 (70 min),
respectively. It was found that COD removal is 100 % for both dyes. Ozonation
kinetics were studied and it was found that it agreed with the pseudo first
order kinetics for two dyes. The highest pseudo first order kinetic constants
are 0.1918 min^-1 (R²: 0.9978, pH:2) and 0.0794 min^-1
(R²: 0.9918, pH:6) for RB-5 and RO-16, respectively. The results
obtained in this study showed that ozonation of reactive dyes at acidic or
neutral pH was more suitable than that of alkaline pH.

Keywords

Ozonation, decolorization, chemical oxygen demand, Reactive Orange 16, Reactive Black 5

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