Fundamentals and applications of photoelectrocatalysis as an efficient process to remove pollutants from water: A review.
Alulema-Pullupaxi, P., Espinoza-Montero, P. J., Sigcha-Pallo, C., Vargas, R., Fernandez, L., Peralta-Hernandez, J. M. and Paz, J. L.
Escuela de Ciencias Quimicas, Pontificia Universidad Catolica del Ecuador, Avenida 12 de Octubre y Roca, PO.Box: 1701-2184, Quito, Ecuador.
Escuela de Ciencias Quimicas, Pontificia Universidad Catolica del Ecuador, Avenida 12 de Octubre y Roca, PO.Box: 1701-2184, Quito, Ecuador. Electronic address: pespinoza646@puce.edu.ec.
Instituto Tecnologico de Chascomus (INTECH), Universidad Nacional de San Martin (UNSAM)- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET), Av. Intendente Marino, Km 8.2, CC 164 (B7130IWA), Chascomus, Argentina; Departamento de Quimica, Universidad Simon Bolivar (USB), Apartado 89000, 1080A, Caracas, Venezuela.
Departamento de Quimica, Division de Ciencias Naturales y Exactas, Universidad de Guanajuato, Cerro de la Venada s/n, Pueblito de Rocha, 36040, Guanajuato, Mexico.
Departamento Academico de Quimica Inorganica, Facultad de Quimica e Ingenieria Quimica, Universidad Nacional Mayor de San Marcos, Lima, Peru.
Water pollution is an environmental problem in constant raising because of population growing, industrial development, agricultural frontier expansion, and principally because of the lack of wastewater treatment technology to remove organic recalcitrant and toxic pollutants from industrial and domestic wastewater. Recalcitrant compounds are a serious environmental and health problem mainly due to their toxicity and potential hazardous effects on living organisms, including human beings. Conventional wastewater treatments have not been able to remove efficiently pollutants from water; however, electrochemical advanced oxidation processes (EAOPs) are able to solve this environmental concern. One of the most recent EAOPs technology is photoelectrocatalysis (PEC), it consists in applying an external bias potential to a semiconductor film placed over a conductive substrate to avoid the recombination of photogenerated electron-hole (e(-)/h(+)) pairs, increasing h(+) availability and hydroxyl radicals' formation, responsible for promoting the degradation/mineralization of organic pollutants in aqueous medium. This review summarizes the recent advances in PEC as a promising technology for wastewater treatment. It addresses the fundamentals and kinetic aspects of PEC. An analysis of photoanode materials and of the configuration of photoelectrochemical reactors is also presented, including an analysis of the influence of the main operational parameters on the treatment of contaminated water. Finally, the most recent applications of PEC are reviewed, and the challenges and perspectives of PEC in wastewater treatment are discussed.
Chemosphere 281: 130821 (2021)