Effects of reactive oxidants generation and capacitance on photoelectrochemical water disinfection with self-doped titanium dioxide nanotube arrays

Photo-assisted electrochemical advanced oxidation processes for the disinfection of aqueous solutions: A review

“…Photo-assisted electrocatalytic processes have been largely explored in recent times for water disinfection due to their high efficiency, operability under ambient conditions and the associated low-cost of the equipment ( Cho et al., 2019 ; Egerton, 2011 ; Garcia-Segura and Brillas, 2017 ; Rather and Lo, 2020 ). In these processes, the potential gradient forces the electrons towards the cathode, thus promoting the photo-generated h + reaction at the anode with water to yield • OH radicals (Eq.…”

“…Additional efforts have been made in order to enhance the photocatalytic properties of TiO 2 . In this regard, the enrichment of Ti 3+ species within the semiconductor structure (self-doping) by cathodic polarization of TiO 2 improves its electronic and optical properties ( Cho et al., 2019 ). In this way, oxygen vacancies (e.g.…”

“…( Hou et al., 2012 ). Furthermore, in photo-electrocatalytic processes, electronegative E. coli membrane surfaces can get in direct contact with photo-generated h + and • OH radical species due to the strong adsorption promoted by the positive polarization potential (electromigration) of the anode surface ( Cho et al, 2011 , 2019 ; Kang et al., 2010 ; Pablos et al, 2017a , 2017b ).…”

Preparation of ZnO/two-layer self-doped black TiO2 nanotube arrays and their enhanced photochemical properties

“…9 Since then, research efforts have been promoted to the black TiO 2 to improve its photoelectrochemical properties. 10,11 However, either the high temperature or the long time for the annealing processes are limited for its practical application. Alternatively, the electrochemical reduction provides a simpler method for the fabrication of the black TiO 2 which will not introduce other chemical elements and is more economic and environmentally friendly.…”

Disinfection of Bacteria in Water by Capacitive Deionization

“…Among them, chlorination is the most widely used technique providing both primary and residual disinfection, albeit with certain disadvantages (Kimbrough and Suffet, 2002 ; Hua and Reckhow, 2007 ; Richardson and Postigo, 2012 ; Al-Abri et al, 2019 ; Stefán et al, 2019 ; Zhong et al, 2019 ). However it is fast being replaced with new technologies like photocatalysis, UV light treatment, ultrasonication, magnetic enhanced disinfection, and electrochemical methods (Baruah et al, 2012 ; Bora et al, 2017 ; Cheema et al, 2018 ; Cho et al, 2019 ; Jiang et al, 2019 ; Wang C. et al, 2019 ; You et al, 2019 ). Please note that most of the new methods are good primary disinfectants which kill/disable the microbes instantly upon contact, but not for residual disinfection, which demands persistence of the disinfection process over time.…”