The remediation performance and mechanism for tetracycline from groundwater using controlled release materials containing mesoporous MnO x with different morphology.

Autor: Wang T; School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China., Chen JL; School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China., Huang R; School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China., Wu LG; School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China., Chen KP; School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China. Electronic address: kpchen@nju.edu.cn., Wu JC; School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China., Chen HL; School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China. Electronic address: hualichen@mail.zjgsu.edu.cn.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2024 Dec 15; Vol. 363 (Pt 1), pp. 125123. Date of Electronic Publication: 2024 Oct 15.
DOI: 10.1016/j.envpol.2024.125123
Abstrakt: Aiming at the effective remediation of antibiotic contaminants in groundwater, in-situ chemical oxidation (ISCO), using controlled release materials (CRMs) as an oxidant deliverer, has emerged as a promising technique due to their long-term effective pollutant removal performance. This study used different microstructures of mesoporous manganese oxide (MnO x ) and sodium persulfate as active components to fabricate CRMs. Following that, a comparative study of tetracycline (TC) degradation and the formation of reactive oxygen species (ROS) by mesoporous MnO x powder and CRMs were conducted. The ROS formed during peroxodisulfate (PDS) activation by powder catalysts and CRMs differed, but MnO x powder catalysts and CRMs both had good reaction stoichiometric efficiency (RSE) for PDS, thus completely mineralizing TC. In PDS activation by mesoporous MnO x powder, oxygen vacancies (OVs) caused by defects in the catalysts contributed to the generation of singlet oxygen ( 1 O 2 ). The 1 O 2 and free radicals (·SO 4 - and ·OH) both worked as major ROS participating in TC degradation. Concerning the release of CRMs in static groundwater, the immobilization of catalysts inside CRMs made it difficult to release 1 O 2 in the solution, thus slowing the degradation of TC by CRMs containing MnO x (1) in static groundwater. In the TC remediation in dynamic groundwater, the water flowing slowly passed through the CRM layer, and TC molecules were trapped. Therefore, 1 O 2 degraded the trapped TC in the CRM layer in dynamic groundwater. Compared to TC, the toxicity of most intermediates during the TC degradation by CRMs has decreased in static and dynamic groundwater.
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 © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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