Enhanced dual synergistic mechanism of adsorption and ozone triggering via biochar-derived zero-valent bimetal sites for water purification

Cheng, Yizhen; Zhu, Xiaoyu; Yan, Pengwei; Wang, Binyuan; Kang, Jing; Shen, Jimin; Tan, Qiang; Zhu, Xinwei; She, Tianhao; Zuo, Jinxiang; Zhao, Shengxin; Chen, Zhonglin

doi:10.1016/j.apcatb.2023.123618

Cited by 8 publications

(3 citation statements)

References 58 publications

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“…The carbon–metal composite-based HCO process usually involves a variety of ROS both in the solution and on the surface of catalysts . To assess the potential ROS within the O 3 /ZNC400 system, initial evaluations were performed through quenching experiments.…”

Section: Resultsmentioning

confidence: 99%

“…The carbon−metal composite-based HCO process usually involves a variety of ROS both in the solution and on the surface of catalysts. 46 To assess the potential ROS within the O 3 / ZNC400 system, initial evaluations were performed through quenching experiments. As shown in Figure 3a, the removal of ATZ exhibited notable inhibition when exposed to typical scavengers for ) substrates, respectively.…”

Section: Ros Exploration and Omentioning

confidence: 99%

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Synergistic Catalytic Ozonation Mediated by Dual Active Sites of Oxygen Vacancies and Defects in Biomass-Derived Composites for Long-Lasting Water Decontamination

Cheng,

Chen,

Yan

et al. 2024

ACS Catal.

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Environmental decontamination relies on low-cost, sustainable materials to drive diverse catalytic redox reactions. In this work, we used low-cost biomass to develop nanocomposites of N-doped carbon-supported zinc oxide (ZNC400) at a low temperature (400 °C), which exhibited ultrahigh activity in heterogeneous catalytic ozonation (HCO) for organic water decontamination. Our experimental and computational studies revealed the collaborative functions of dual active centers of defective carbons and oxygen vacancies (OVs)-containing zinc oxide (ZnO) at the composite interface for successive ozone (O 3 ) adsorption and catalytic decomposition, respectively. Inspiringly, OVs on ZnO will spontaneously dissociate water molecules (H 2 O) to form surface hydroxyl groups (−OH) as key intermediates to accelerate O 3 decomposition. This synergistic interplay results in the continuous generation of hydroxyl radicals ( • OH) and maintains over 90.2% atrazine (ATZ) removal over five successive cycles, endowing ZNC400 with substantial reusability. Furthermore, four ATZ degradation pathways were proposed, and the corresponding toxicity was evaluated by the embryonic development of zebrafish in the treated water. Overall, the engineered dual-function catalyst effectively addresses the long-standing issue of poor stability of carbon materials in HCO and offers high-performance, cheap, and green catalysts for advanced water purification.

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Section: Resultsmentioning

confidence: 99%

Section: Ros Exploration and Omentioning

confidence: 99%

Synergistic Catalytic Ozonation Mediated by Dual Active Sites of Oxygen Vacancies and Defects in Biomass-Derived Composites for Long-Lasting Water Decontamination

Cheng,

Chen,

Yan

et al. 2024

ACS Catal.

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“…Kinetic fitting indicated that the adsorption of both compounds follows pseudo-second-order kinetic behavior ( Silori et al, 2023 ). After capturing CHCs molecules, surface active substances [such as carboxyl groups -COOH, hydroxyl groups -OH, metal atoms ( Cheng et al, 2024 ), non-metallic active substances N and S, etc. ( Yang et al, 2020 )] and/or electron transfer react with the CHCs molecules on the surface, rendering them harmless and reusable.…”

Section: Introductionmentioning

confidence: 99%

Biochar, microbes, and biochar-microbe synergistic treatment of chlorinated hydrocarbons in groundwater: a review

Niu,

Li,

Gao

et al. 2024

Front. Microbiol.

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Dehalogenating bacteria are still deficient when targeted to deal with chlorinated hydrocarbons (CHCs) contamination: e.g., slow metabolic rates, limited substrate range, formation of toxic intermediates. To enhance its dechlorination capacity, biochar and its composites with appropriate surface activity and biocompatibility are selected for coupled dechlorination. Because of its special surface physical and chemical properties, it promotes biofilm formation by dehalogenating bacteria on its surface and improves the living environment for dehalogenating bacteria. Next, biochar and its composites provide active sites for the removal of CHCs through adsorption, activation and catalysis. These sites can be specific metal centers, functional groups or structural defects. Under microbial mediation, these sites can undergo activation and catalytic cycles, thereby increasing dechlorination efficiency. However, there is a lack of systematic understanding of the mechanisms of dechlorination in biogenic and abiogenic systems based on biochar. Therefore, this article comprehensively summarizes the recent research progress of biochar and its composites as a “Taiwan balm” for the degradation of CHCs in terms of adsorption, catalysis, improvement of microbial community structure and promotion of degradation and metabolism of CHCs. The removal efficiency, influencing factors and reaction mechanism of the degraded CHCs were also discussed. The following conclusions were drawn, in the pure biochar system, the CHCs are fixed to its surface by adsorption through chemical bonds on its surface; the biochar composite material relies on persistent free radicals and electron shuttle mechanisms to react with CHCs, disrupting their molecular structure and reducing them; biochar-coupled microorganisms reduce CHCs primarily by forming an “electron shuttle bridge” between biological and non-biological organisms. Finally, the experimental directions to be carried out in the future are suggested to explore the optimal solution to improve the treatment efficiency of CHCs in water.

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Mn/Co bimetallic catalyst immobilized on N-doped biochar for enhanced photocatalytic degradation of sulfanilamide in water

Lyu,

Wang,

et al. 2024

Applied Catalysis B: Environment and Energy

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Enhanced dual synergistic mechanism of adsorption and ozone triggering via biochar-derived zero-valent bimetal sites for water purification

Cited by 8 publications

References 58 publications

Synergistic Catalytic Ozonation Mediated by Dual Active Sites of Oxygen Vacancies and Defects in Biomass-Derived Composites for Long-Lasting Water Decontamination

Synergistic Catalytic Ozonation Mediated by Dual Active Sites of Oxygen Vacancies and Defects in Biomass-Derived Composites for Long-Lasting Water Decontamination

Biochar, microbes, and biochar-microbe synergistic treatment of chlorinated hydrocarbons in groundwater: a review

Mn/Co bimetallic catalyst immobilized on N-doped biochar for enhanced photocatalytic degradation of sulfanilamide in water

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