Electrochemically-driven mineralization of Reactive Blue 4 cotton dye: On the role of in situ generated oxidants

Author(s)

Nakamura, Karen Christine ^[1] ; Guimaraes, Luciana Silva ^[1] ; Magdalena, Aroldo G. ^[2] ; Dias Angelo, Antonio Carlos ^[2] ; De Andrade, Adalgisa R. ^{[3, 4]} ; Garcia-Segura, Sergi ^[5] ; Pipi, Angelo R. F. ^[1]

Affiliation

^[1] Univ Sagrado Coracao, Proreitoria Pesquisa & Posgrad PRPPG, Rua Irma Arminda 10-50, BR-17011160 Bauru, SP - Brazil

^[2] Sao Paulo State Univ UNESP, Sch Sci, Dept Chem, Campus Bauru, Bauru, SP - Brazil

^[3] Unesp, Natl Inst Alternat Technol Detect Toxicol Evaluat, Inst Chem, POB 355, BR-14800900 Araraquara, SP - Brazil

^[4] Univ Sao Paulo, FFCLRP, Lab Eletrocatalise & Eletroquim Ambiental, Dept Quim, Av Bandeirantes 3900, BR-14040901 Ribeirao Preto, SP - Brazil

^[5] Arizona State Univ, Sch Sustainable Engn & Built Environm, Nanosyst Engn Res Ctr Nanotechnol Enabled Water T, Tempe, AZ 85287 - USA

• Document type: Journal article
• Source: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 840, p. 415-422, MAY 1 2019.
• Web of Science Citations: 0

Abstract

Brazil is the fifth biggest global manufacturer of textiles and the fourth in cotton textile exports. Textile effluents contain organic dyes that are highly recalcitrant and difficult to oxidize by conventional physico-chemical and biological treatments. Mid-sized textile factories require reliable water treatment technologies of small physical foot-print that do no produce solid wastes to treat their manufacturing effluents. Electrochemically-driven technologies emerge as feasible alternative technologies that overcome barriers in the management of these industrial effluents. This work studies the application of electrochemical advanced oxidation processes on the treatment of dye bath effluents containing cotton dye Reactive Blue 4. Electra-Fenton treatment attains complete color removal with an electrical energy per order (E-EO) of 7.4 kWh m(-3) order(-1), which represents an order of magnitude lower operational expenditure than electrochemical oxidation (54.8 kWh m(-3) order(-1)). Simultaneous irradiation with UVA light in photoelectron-Fenton systems did not show any effect on RB4 degradation kinetics. But UVA irradiation increased the mineralization achieved after treatment, which enhanced current efficiencies ca. 2-fold respect to electro-Fenton. (AU)

• FAPESP's process: 17/12788-2 - Electro-Fenton method in the absence and presence of UV light employed in the degradation of the reactive blue dye 4 using ADE anode and gas diffusion cathode
• Grantee: Karen Christine Nakamura
• Support Opportunities: Scholarships in Brazil - Scientific Initiation