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Su Q, Ren F, Lu M, Zhao J, Zhu X, Shen T, Shen Y, Wang Y, Liang J. Theoretical Study of the NO Reduction Mechanism on Biochar Surfaces Modified by Li and Na Single Adsorption and OH Co-Adsorption. Molecules 2024; 29:574. [PMID: 38338318 PMCID: PMC10856491 DOI: 10.3390/molecules29030574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 01/18/2024] [Accepted: 01/22/2024] [Indexed: 02/12/2024] Open
Abstract
Theoretical and experimental investigations have shown that biochar, following KOH activation, enhances the efficiency of NO removal. Similarly, NaOH activation also improves NO removal efficiency, although the underlying mechanism remains unclear. In this study, zigzag configurations were employed as biochar models. Density functional theory (DFT) was utilized to examine how Li and Na single adsorption and OH co-adsorption affect the reaction pathways of NO reduction on the biochar surface. The rate constants for all reaction-determining steps (RDSs) within a temperature range of 200 to 1000 K were calculated using conventional transition state theory (TST). The results indicate a decrease in the activation energy for NO reduction reactions on biochar when activated by Li and Na adsorption, thus highlighting their beneficial role in NO reduction. Compared to the case with Na activation, Li-activated biochar exhibited superior performance in terms of the NO elimination rate. Furthermore, upon the adsorption of the OH functional group onto the Li-decorated and Na-decorated biochar models (LiOH-decorated and NaOH-decorated chars), the RDS energy barriers were higher than those of Li and Na single adsorption but easily overcome, suggesting effective NO reduction. In conclusion, Li-decorated biochar showed the highest reactivity due to its low RDS barrier and exothermic reaction on the surface.
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Affiliation(s)
- Qiong Su
- Engineering Research Center of Biomass-Functional Composite Materials of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou 730030, China; (Q.S.); (F.R.); (M.L.); (J.Z.); (X.Z.); (T.S.)
| | - Fang Ren
- Engineering Research Center of Biomass-Functional Composite Materials of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou 730030, China; (Q.S.); (F.R.); (M.L.); (J.Z.); (X.Z.); (T.S.)
| | - Mengmeng Lu
- Engineering Research Center of Biomass-Functional Composite Materials of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou 730030, China; (Q.S.); (F.R.); (M.L.); (J.Z.); (X.Z.); (T.S.)
| | - Jinqin Zhao
- Engineering Research Center of Biomass-Functional Composite Materials of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou 730030, China; (Q.S.); (F.R.); (M.L.); (J.Z.); (X.Z.); (T.S.)
| | - Xingchen Zhu
- Engineering Research Center of Biomass-Functional Composite Materials of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou 730030, China; (Q.S.); (F.R.); (M.L.); (J.Z.); (X.Z.); (T.S.)
| | - Tao Shen
- Engineering Research Center of Biomass-Functional Composite Materials of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou 730030, China; (Q.S.); (F.R.); (M.L.); (J.Z.); (X.Z.); (T.S.)
| | - Yan Shen
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211800, China;
| | - Yanbin Wang
- Engineering Research Center of Biomass-Functional Composite Materials of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou 730030, China; (Q.S.); (F.R.); (M.L.); (J.Z.); (X.Z.); (T.S.)
| | - Junxi Liang
- Engineering Research Center of Biomass-Functional Composite Materials of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou 730030, China; (Q.S.); (F.R.); (M.L.); (J.Z.); (X.Z.); (T.S.)
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