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Catalysts 2019, 9(4), 360; https://doi.org/10.3390/catal9040360

Optimization of Photocatalytic Degradation of Acid Blue 113 and Acid Red 88 Textile Dyes in a UV-C/TiO2 Suspension System: Application of Response Surface Methodology (RSM)

1
Department of Mechanical Engineering, University of Nevada, Las Vegas, Las Vegas, NV 89154, USA
2
Department of Civil and Environmental Engineering and Construction, University of Nevada, Las Vegas, Las Vegas, NV 89154, USA
*
Author to whom correspondence should be addressed.
Received: 19 March 2019 / Revised: 5 April 2019 / Accepted: 8 April 2019 / Published: 14 April 2019
(This article belongs to the Special Issue Emerging Trends in TiO2 Photocatalysis and Applications)
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Abstract

Textile industries produce copious amounts of colored wastewater some of which are toxic to humans and aquatic biota. This study investigates optimization of a bench-scale UV-C photocatalytic process using a TiO2 catalyst suspension for degradation of two textile dyes, Acid Blue 113 (AB 113) and Acid Red 88 (AR 88). From preliminary experiments, appropriate ranges for experimental factors including reaction time, solution pH, initial dye concentration and catalyst dose, were determined for each dye. Response surface methodology (RSM) using a cubic IV optimal design was then used to design the experiments and optimize the process. Analysis of variance (ANOVA) was employed to determine significance of experimental factors and their interactions. Results revealed that among the studied factors, solution pH and initial dye concentration had the strongest effects on degradation rates of AB 113 and AR 88, respectively. Least-squares cubic regression models were generated by step-wise elimination of non-significant (p-value > 0.05) terms from the proposed model. Under optimum treatment conditions, removal efficiencies reached 98.7% for AB 113 and 99.6% for AR 88. Kinetic studies showed that a first-order kinetic model could best describe degradation data for both dyes, with degradation rate constants of k1, AB 113 = 0.048 min−1 and k1, AR 88 = 0.059 min−1. View Full-Text
Keywords: process optimization; response surface methodology; kinetic study; Advanced oxidation processes (AOPs); TiO2 catalyst; textile wastewater process optimization; response surface methodology; kinetic study; Advanced oxidation processes (AOPs); TiO2 catalyst; textile wastewater
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Mortazavian, S.; Saber, A.; James, D.E. Optimization of Photocatalytic Degradation of Acid Blue 113 and Acid Red 88 Textile Dyes in a UV-C/TiO2 Suspension System: Application of Response Surface Methodology (RSM). Catalysts 2019, 9, 360.

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