Titanium dioxide/oxidized carbon fiber electrodes electrochemically produced and their influences on Brilliant Green dye degradation

Author(s)

Pereira, Lania Auxiliadora ^[1] ; de Lima Almeida, Dalva Alves ^[1] ; Couto, Andrea Boldarini ^[1] ; Ferreira, Neidenei Gomes ^[1]

Affiliation

^[1] Natl Inst Space Res INPE, Ave Astronautas 1758, BR-12227010 Sao Jose Dos Campos, SP - Brazil

• Document type: Journal article
• Source: Materials Research Bulletin; v. 122, FEB 2020.
• Web of Science Citations: 0

Abstract

Electrochemical advanced oxidation processes to degrade organic pollutants require the study of new anode materials. Porous structure of three-dimensional oxidized carbon fibers (OCF) associated to titanium dioxide (TiO2) becomes an alternative since they can effectively improve the mass transport in their enlarged areas. TiO2/OCF electrodes were produced from an optimized OCF substrate evaluating the influence of oxygen functional groups on its surface in the TiCl3 anodic hydrolysis. From scanning electron microscopy, Raman analyzes, and electro/photoelectrochemical responses, a suitable TiO2/OCF composite was obtained from oxidized CF for 30 min. TiO2 presented several characteristic Raman bands of anatase modes at 150, 398, 511, and 620 cm(-1). To improve the TiO2 crystallinity, the samples were also heat-treated at 500 degrees C in an argon atmosphere for 2, 3, and 4 h. TiO2/OCF composite treated for 2 h presented the highest electrochemically active surface area and photoelectrochemical activity. This is due to its TiO2 rougher morphology with rounded nanoparticles presence on OCF surface. For Brilliant Green dye degradation, an electrolysis process was highly efficient at the current density of 10 mA cm(-2) at 300 min of time treatment. Besides, TiO2/OCF composite under UV irradiation shows an electrolysis efficiency improvement presenting the highest kinetic rate associated to the additional (OH)-O-center dot radical productions. (AU)

• FAPESP's process: 16/13393-9 - Semiconductor, polymeric, and carbonaceous composite electrodes ayming the synergy between water cleaning and energy storage processes
• Grantee: Neidenei Gomes Ferreira
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/10118-0 - Study and application of electrochemical technology for the analysis and degradation of endocrine interferents: materials, sensors, processes and scientific dissemination
• Grantee: Marcos Roberto de Vasconcelos Lanza
• Support Opportunities: Research Projects - Thematic Grants