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Combined electrochemical in-situ activated chlorine production and photocatalytic for degradation of dimethyl phthalate using membrane filtration recycle TiO2

Year: 2024
Type: article
Abstract: The ultraviolet (UV)/chlorine advanced oxidation process (AOP), involving addition of activated chlorine to the UV irradiation system to generate hydroxyl radicals (HO·) and chlorine radicals (Cl·), is promising in addressing refractory organic matters. Herein, activated chlorine was electrochemically in-situ generated under low concentrations of chloride ions (Cl − ), serving as the chlorine source. A UV/electrochemistry/titanium dioxide (UV/E/TiO 2 ) system was established by coupled membrane filtration. TiO 2 was separated and circulated to remove dimethyl phthalate (DMP). Impacts of catalyst (TiO 2 ), Cl − concentrations, and initial pH on DMP degradation were investigated under different conditions. The results revealed that compared with E and UV/TiO 2 systems, the UV/E/TiO 2 system substantially enhanced the DMP degradation (from 5.11 % and 22.54 % to 78.33 %), with a synergistic factor of 1.16. Radical quenching experiments confirmed that HO·and Cl·were the primary reactive substances for DMP degradation in the UV/E/TiO 2 system. Fluorescence probe experiments, coupled with HPLC and LC–MS analysis, revealed a continuous decrease in Cl − in the UV/E/TiO 2 system due to ongoing photolysis, generating more HO·for DMP degradation in contrast to the E/TiO 2 system. In conclusion, the coupled UV/E/TiO 2 system can promote the degradation of refractory organic pollutants in water environments, showcasing significant potential.
DOI: 10.1016/j.dwt.2024.100826
Language: English
Open Access status: gold
Estimated APC paid: $1,000
OpenAlex ID: W4403244088
FWCI:
Cites: 52
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Related to: 10