Nano boron carbide effectively boost Fenton-like performance of hematite mediated systems: Roles of hematite exposed facets and synergistic catalysis between Fe and B.

Autor: Zhang Y; School of Environmental & Chemical Engineering, Dalian Jiaotong University, Dalian, 116021, China., Yu H; School of Environmental & Chemical Engineering, Dalian Jiaotong University, Dalian, 116021, China; Key Lab of Eco-restoration of Regional Contaminated Environment (Shenyang University), Ministry of Education, Shenyang, 110003, China. Electronic address: hualiyu@djtu.edu.cn., Liu G; Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China., Guo H; School of Environmental & Chemical Engineering, Dalian Jiaotong University, Dalian, 116021, China., Yan S; School of Environmental & Chemical Engineering, Dalian Jiaotong University, Dalian, 116021, China., Han L; School of Environmental & Chemical Engineering, Dalian Jiaotong University, Dalian, 116021, China., Jin X; School of Environmental & Chemical Engineering, Dalian Jiaotong University, Dalian, 116021, China., Luo Q; Key Lab of Eco-restoration of Regional Contaminated Environment (Shenyang University), Ministry of Education, Shenyang, 110003, China., Wang L; School of Environmental & Chemical Engineering, Dalian Jiaotong University, Dalian, 116021, China. Electronic address: wanglfdl@aliyun.com.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2024 Dec 15; Vol. 363 (Pt 1), pp. 125050. Date of Electronic Publication: 2024 Oct 04.
DOI: 10.1016/j.envpol.2024.125050
Abstrakt: The inherent properties of exposed facets of iron minerals played key roles in heterogeneous reactions at the mineral interface, and the addition of co-catalysts has been elucidated to further enhance the reactions for contaminants degradation. Here, synergistic Fenton-like catalytic reactivity of different hematite dominant exposed facets ({001}, {012}, {100}, and {113}) with nano boron carbide (B 4 C) was revealed. In 5 h, as compared with the cumulative •OH in the B 4 C/H 2 O 2 system (96.9 μM), while that in the {001}/B 4 C/H 2 O 2 system was decreased by 19.6%, those in the {012}/B 4 C/H 2 O 2 , {100}/B 4 C/H 2 O 2 , and {113}/B 4 C/H 2 O 2 systems were increased by 53.8%, 75.9%, and 84.0%, respectively. Significantly, {113}/B 4 C/H 2 O 2 system exhibited strong capability for degradation of a broad spectrum of organic pollutants, including typical phenol, endocrine disruptor (bisphenol A), antibiotic (sulfanilamide), dyes (Rhodamine B and methylene blue), and pesticide (atrazine). During the Fenton-like reactions, higher synergy factor, Fe(III)/Fe(II) cycling rate, and amount of Fe-O-B bond in the {113}/B 4 C/H 2 O 2 system were shown than those in other systems, thus exhibiting its desirable catalytic performance for •OH production and pollutants oxidation. Iron species and X-ray photoelectron spectroscopy (XPS) analyses indicated that B-B bond and interfacial suboxide boron (e.g., B-O) could provide electrons to facilitate Fe(III) reduction for boosting the Fe(III)/Fe(II) cycling. Density functional theory (DFT) results demonstrated the formation of Fe-O-B bond on hematite {113}, {100}, and {012} facets, which were beneficial to the breakage of O-O bond of bound H 2 O 2 molecule and thus improved the generation of •OH. This study emphasized the essential role of B 4 C in developing tailored hematite facets as a contaminant remediation substrate, and provided important insights into the design of efficient heterogeneous Fenton-like systems.
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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