Photoelectrochemical reactors for treatment of water and wastewater: a review

Mousset, Emmanuel; Dionysiou, Dionysios D.

doi:10.1007/s10311-020-01014-9

Cited by 77 publications

(40 citation statements)

References 109 publications

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“…For this purpose, electrodes made of carbonaceous materials such as carbon fibers, carbon felts and reticulated carbon vitreous are commonly used due to their high superficial area, high overpotential for H 2 evolution and to their low catalytic activity for H 2 O 2 reduction ( Bañuelos et al., 2016 ; García-Rodríguez et al., 2016 ; Mousset and Dionysiou, 2020 ; Pérez et al., 2017a ; Zárate-Guzmán et al., 2019 ; Zhou et al., 2018 ). Furthermore, the performance of the carbonaceous cathodes towards H 2 O 2 generation can be improved by the addition of PTFE and carbon black ( Jiao et al., 2020 ; Pérez et al, 2017b , 2019 ; Zhang et al., 2020c ; Zhao et al., 2019 ).…”

Section: Indirect Oxidationmentioning

confidence: 99%

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

et al. 2021

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Disinfection is usually the final step in water treatment and its effectiveness is of paramount importance in ensuring public health. Chlorination, ultraviolet (UV) irradiation and ozone (O 3 ) are currently the most common methods for water disinfection; however, the generation of toxic by-products and the non-remnant effect of UV and O 3 still constitute major drawbacks. Photo-assisted electrochemical advanced oxidation processes (EAOPs) on the other hand, appear as a potentially effective option for water disinfection. In these processes, the synergism between electrochemically produced active species and photo-generated radicals, improve their performance when compared with the corresponding separate processes and with other physical or chemical approaches. In photo-assisted EAOPs the inactivation of pathogens takes place by means of mechanisms that occur at different distances from the anode, that is: (i) directly at the electrode’s surface (direct oxidation), (ii) at the anode’s vicinity by means of electrochemically generated hydroxyl radical species (quasi-direct), (iii) or at the bulk solution (away from the electrode surface) by photo-electrogenerated active species (indirect oxidation). This review addresses state of the art reports concerning the inactivation of pathogens in water by means of photo-assisted EAOPs such as photo-electrocatalytic process, photo-assisted electrochemical oxidation, photo-electrocoagulation and cathodic processes. By focusing on the oxidation mechanism, it was found that while quasi-direct oxidation is the preponderant inactivation mechanism, the photo-electrocatalytic process using semiconductor materials is the most studied method as revealed by numerous reports in the literature. Advantages, disadvantages, trends and perspectives for water disinfection in photo-assisted EAOPs are also analyzed in this work.

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Section: Indirect Oxidationmentioning

confidence: 99%

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

et al. 2021

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“…Finally, it might be not suitable to use AO as a post-treatment following a biological treatment because of strong mass transport limitation and low faradaic efficiency due to the low concentration of organics. However, the use of flow-through electrodes in which the effluent flow through porous conductive materials might be able to address this issue because of the convection-enhanced mass transport of organic compounds [21,[35][36][37][38].…”

Section: Anodic Oxidation Coupled With Biological Treatmentsmentioning

confidence: 99%

Electrochemical technologies coupled with biological treatments

Mousset

Trellu

Olvera‐Vargas

et al. 2021

Current Opinion in Electrochemistry

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“…Thus, the AOP have recently attracted the attention of researchers because they allow for the continuous electrocatalytic generation of strong oxidizing species under mild conditions. Moreover, energy can be saved by using sunlight in photovoltaic electrolysis systems and using a catalyst to speed up reactions [60]. Generally, UV is a well-known disinfection process normally used for drinking water treatment via their breakdown of water H-O bond.…”

Section: Photocatalysis Processmentioning

confidence: 99%

Photo-Catalytic Remediation of Pesticides in Wastewater Using UV/TiO2

EL-Saeid

Alotaibi

Alshabanat

et al. 2021

Water

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One of the most serious environmental concerns worldwide is the consequences of industrial wastes and agricultural usage leading to pesticide residues in water. At present, a wide range of pesticides are used directly to control pests and diseases. However, environmental damage is expected even at their low concentration because they are sustained a long time in nature, which has a negative impact on human health. In this study, photolysis and photocatalysis of the pesticides dieldrin and deltamethrin were tested at two UV wavelengths (254 and 306 nm) and in different test media (distilled water, wastewater, and agricultural wastewater) to examine their ability to eliminate pesticides. TiO2 (0.001 g/10 mL) was used as a catalyst for each treatment. The purpose was to determine the influence of UV wavelength, exposure time, and catalyst addition on the pesticide decomposition processes in different water types. Water was loaded with the tested pesticides (2000 µg) for 12 h under UV irradiation, and the pesticide concentrations were measured at 2 h intervals after UV irradiation. The results showed a clear effect of UV light on the pesticides photodegradations that was both a wavelength- and time-dependent effect. Photolysis was more effective at λ = 306 nm than at λ = 254 nm. Furthermore, TiO2 addition (0.001 g/10 mL) increased the degradation at both tested wavelengths and hence could be considered a potential catalyst for both pesticide degradations. Deltamethrin was more sensitive to UV light than dieldrin under all conditions.

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Photoelectrochemical reactors for treatment of water and wastewater: a review

Abstract: penetration depth when the light is applied through the reactor. These insights give some keys for future development of photo-electrochemical technologies.

Cited by 77 publications

References 109 publications

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

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

Electrochemical technologies coupled with biological treatments

Photo-Catalytic Remediation of Pesticides in Wastewater Using UV/TiO2

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