Treatment of hazardous landfill leachate containing 1,4 dioxane by biochar-based photocatalysts in a solar photo-oxidation reactor.

Autor: Samy M; Public Works Engineering Department, Faculty of Engineering, Mansoura University, Mansoura, 35516, Egypt., Gar Alalm M; Public Works Engineering Department, Faculty of Engineering, Mansoura University, Mansoura, 35516, Egypt., Khalil MN; National Research Centre, Water Pollution Research Department, Dokki, Giza, 12622, Egypt., Ezeldean E; Department of Environmental Sciences, Faculty of Science, Alexandria University, Alexandria, Egypt., El-Dissouky A; Department of Chemistry, Faculty of Science, Alexandria University, P.O. Box 426, Alexandria, 21321, Egypt., Nasr M; Sanitary Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, 21544, Egypt., Tawfik A; National Research Centre, Water Pollution Research Department, Dokki, Giza, 12622, Egypt. Electronic address: prof.tawfik.nrc@gmail.com.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2023 Apr 15; Vol. 332, pp. 117402. Date of Electronic Publication: 2023 Jan 31.
DOI: 10.1016/j.jenvman.2023.117402
Abstrakt: This study investigates a combined photocatalytic and adsorption system to maximize the removal of 1,4 dioxane from hazardous landfill leachate (HLL). The production of transformation products was also investigated to obtain a comprehensive evaluation of the treatment system. Copper/iron doped zinc oxide (Cu-Fe-ZnO) was introduced to biochar to form a hybrid materials and used to treat HLL contaminated with 1,4 dioxane of 355.0 ± 11.7 mg/L. The Cu-Fe-ZnO/biochar removed 93.1 ± 8.7% of 1,4 dioxane at a dose of 0.6 g/L within 90 min, as compared with only 42.7 ± 3.3% by 1.2 g/L of bare biochar within 210 min. The Cu-Fe-ZnO/biochar degraded 1,4 dioxane into ethylene glycol, glycolic acid, and formic acid. The 1,4 dioxane removal mechanisms were investigated using the density functional theory, demonstrating that doping of ZnO with metal atoms (Cu-Fe) narrowed the bandgap from 3.307 eV to 2.736 eV. The enhanced photocatalytic activity of ZnO was also supported by the role of biochar in increasing the reactive species and adsorbing the pollutant molecules. The high degradation efficiency of 1,4 dioxane using small catalyst doses with short reaction times would reduce the treatment cost and improve the system's applicability for treating HLL and industrial effluents.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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