Sustainable application of electrocatalytic and photo-electrocatalytic oxidation systems for water and wastewater treatment: a review

Farissi, Salman; Abubakar, Gado Abubakar; Akhilghosh, Kochuparambil Ajayaghosh; Muthukumar, Anbazhagi; Muthuchamy, Muthukumar

doi:10.1007/s10661-023-12083-y

Cited by 5 publications

(1 citation statement)

References 159 publications

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“…Following this, the C=O units are diminished on the light-collecting anode to renew C-O (Equation (17)). SO 4 − • has the capability to convert OH − to •OH and 1 O 2 (Equations ( 18) and ( 19)) [12,13]. In aqueous solutions, ozone reacts with various components in two ways: through the direct oxidation of molecular ozone, which involves a selective reaction; or an indirect mechanism by which •OH radicals are produced through ozonolysis (Equation (20)), which are non-selective and highly reactive [14].…”

Section: Introductionmentioning

confidence: 99%

Degradation of Water Pollutants by Biochar Combined with Advanced Oxidation: A Systematic Review

Kong,

Liu,

Xiang

et al. 2024

Water

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Recently, biochar has emerged as a promising option for environmentally friendly remediation due to its cost-effectiveness, extensive surface area, porosity, and exceptional electrical conductivity. Biochar-based advanced oxidation procedures (BC-AOPs) have gained popularity as an effective approach to breaking down organic pollutants in aqueous environments. It is commonly recognized that the main reactive locations within BC-AOPs consist of functional groups found on biochar, which encompass oxygen-containing groups (OCGs), imperfections, and persistent free radicals (PFRs). Additionally, the existence of metallic components supported on biochar and foreign atoms doped into it profoundly impacts the catalytic mechanism. These components not only modify the fundamental qualities of biochar but also serve as reactive sites. Consequently, this paper offers a comprehensive review of the raw materials, preparation techniques, modification approaches, and composite catalyst preparation within the biochar catalytic system. Special attention is given to explaining the modifications in biochar properties and their impacts on catalytic activity. This paper highlights degradation mechanisms, specifically pathways that include radical and non-radical processes. Additionally, it thoroughly examines the importance of active sites as catalysts and the basic catalytic mechanism of BC-AOPs. Finally, the potential and future directions of environmental remediation using biochar catalysts and advanced oxidation processes (AOPs) are discussed. Moreover, suggestions for future advancements in BC-AOPs are provided to facilitate further development.

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