TY - JOUR
T1 - Photo-assisted electrochemical copper removal from cyanide solutions using porous tio2 thin film photo-anodes
AU - Ramírez-Santos, Álvaro A.
AU - Acevedo-Peña, Próspero
AU - Córdoba, Elcy M.
PY - 2014/1
Y1 - 2014/1
N2 - TiO2 porous films were prepared on ITO coated glass slides by the sol-gel dip-coating method assisted with Polyethylene glycol (PEG). The films were used as photo-anodes in the photo-assisted electrolytic removal of cuprous ions in cyanide media. These were characterized by SEM, UV-Visible spectroscopy and XRD. The PEG modified films were free of cracks and developed a porous structure after heat treatment at 500 °C, due to the thermal decomposition of the structure associated PEG. It was demonstrated that the photo-assisted electrochemical reduction of copper is promoted by the use of modified TiO2 films as photo-anodes, thanks to the greater surface area given by the PEG decomposition. However, the film thickness was found to be a critical factor in the process, to such an extent that films composed of 5 layers were completely inefficient, meaning that despite the open porosity, multilayered films acted as a barrier within the photo-electrolytic process.
AB - TiO2 porous films were prepared on ITO coated glass slides by the sol-gel dip-coating method assisted with Polyethylene glycol (PEG). The films were used as photo-anodes in the photo-assisted electrolytic removal of cuprous ions in cyanide media. These were characterized by SEM, UV-Visible spectroscopy and XRD. The PEG modified films were free of cracks and developed a porous structure after heat treatment at 500 °C, due to the thermal decomposition of the structure associated PEG. It was demonstrated that the photo-assisted electrochemical reduction of copper is promoted by the use of modified TiO2 films as photo-anodes, thanks to the greater surface area given by the PEG decomposition. However, the film thickness was found to be a critical factor in the process, to such an extent that films composed of 5 layers were completely inefficient, meaning that despite the open porosity, multilayered films acted as a barrier within the photo-electrolytic process.
KW - Copper ion removal
KW - Photo-assisted electrolysis
KW - Polyethylene glycol (PEG)
KW - Porous TiO thin films
KW - Sol-gel dip-coating
UR - http://www.scopus.com/inward/record.url?scp=84897906345&partnerID=8YFLogxK
U2 - 10.1590/S1516-14392013005000150
DO - 10.1590/S1516-14392013005000150
M3 - Artículo
SN - 1516-1439
VL - 17
SP - 69
EP - 77
JO - Materials Research
JF - Materials Research
IS - 1
ER -