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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Experimental design as a tool for parameter optimization of photoelectrocatalytic degradation of a textile dye

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Author(s):
Bessegato, Guilherme G. [1, 2] ; de Almeida, Lucio C. [1, 3] ; Ferreira, Sergio L. C. [4] ; Boldrin Zanoni, Maria Valnice [1, 5]
Total Authors: 4
Affiliation:
[1] Sao Paulo State Univ, UNESP, Inst Chem, Araraquara Av Prof Francisco Degni 55, BR-14800060 Araraquara, SP - Brazil
[2] Western Parana State Univ UNIOESTE, Ctr Engn & Exact Sci, Rua Fac 645, BR-85903000 Toledo, PR - Brazil
[3] State Univ Londrina UEL, Dept Chem, Environm Electrochem Lab LabEA, Rodovia Celso Garcia Cid, PR 445 Km 380, BR-86057970 Londrina, PR - Brazil
[4] Fed Univ Bahia UFBA, Chem & Chemometr Res Grp, Rua Barao Jeremoabo 147, BR-40170115 Salvador, BA - Brazil
[5] Natl Inst Alternat Technol Detect, Toxicol Evaluat & Removal Micropollutants & Radio, Av Prof Francisco Degni 55, BR-14800060 Araraquara, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 7, n. 4 AUG 2019.
Web of Science Citations: 0
Abstract

Although several factors are found to influence the efficiency of photoelectrocatalytic oxidation, univariate optimization may not provide some relevant information, such as the existence of interaction between the factors. This article describes the optimization of photoelectrocatalytic parameters by response surface methodology (RSM) using a two-level full factorial composite design with center point. The factors investigated included pH, bias potential and counter electrode material (C.F.) employed in the photoelectrocatalytic degradation of 50 mg L-1 Acid Red 151 (AR151) azo dye (taken as a model textile dye) in 0.01 mol L-1 Na2SO4 electrolyte, using boron-doped TiO2 nanotube (B-TNT) photoanode under UV/Vis Hg lamp irradiation. The responses evaluated were total organic carbon removal and decolorization. The results showed that all the factors exerted a significant effect, among which the pH was the variable with the greatest impact on the PEC treatment. Although less significant, interactions between the variables, such as pH and the counter electrode, were observed for both responses. The best conditions for the photoelectrocatalytic degradation of AR151 dye were pH 2.0 and potential of 2.0 V using graphite as counter electrode. Photoelectrocatalytic treatment of 50 mg L-1 of AR151 dye reached total decolorization in 30 min and almost total mineralization after 90 min. The findings show that the use of RSM to optimize degradation conditions helps to save time and chemicals, in addition to contributing toward a better understanding of the factors that affect photoelectrocatalytic performance. (AU)

FAPESP's process: 15/18109-4 - Contribution of nanostructured materials in electroanalysis of pharmaceuticals and dyes, in the oxidation and reduction photoeletrocatalytic process of inorganic and organic pollutants and water disinfection
Grantee:Maria Valnice Boldrin
Support type: Regular Research Grants
FAPESP's process: 11/21606-9 - Synthesis and characterization of Ti/TiO2-Pt and Ti/TiO2/WO3 photoanodes for application in the degradation of Vat dyes by photoelectro-Fenton process
Grantee:Lucio César de Almeida
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies
Grantee:Maria Valnice Boldrin
Support type: Research Projects - Thematic Grants
FAPESP's process: 08/10449-7 - Assessment of occurrence, toxicity/genotoxicity and degradation processes of dyes in effluents and surface water
Grantee:Maria Valnice Boldrin
Support type: Research Projects - Thematic Grants
FAPESP's process: 12/18357-0 - Study of photoeletrocatalytic degradation of cosmetic dyes with TiO2 nanotube electrodes undoped and doped Sb2S3
Grantee:Guilherme Garcia Bessegato
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 14/03679-7 - Degradation of hair dyes and salon wastewater by photoelectrocatalysis with modified TiO2 nanotube electrodes and combination with ozonation
Grantee:Guilherme Garcia Bessegato
Support type: Scholarships in Brazil - Doctorate (Direct)