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Xu S, Guo X, Wang J, Guo Y, Shi J. Chemical scanning of atomic oxygen at the gas-liquid interface of a NaCl solution via quantum mechanics/molecular mechanics molecular dynamics simulations. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 896:165329. [PMID: 37419342 DOI: 10.1016/j.scitotenv.2023.165329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 06/26/2023] [Accepted: 07/03/2023] [Indexed: 07/09/2023]
Abstract
Atmospheric pressure plasmas can serve as double phase reactors to produce plasma activated water for water treatment. However, the physical-chemical processes involving plasma-supplied atomic oxygen and reactive oxygen species in an aqueous solution remain unclear. In this work, quantum mechanics (QM)/molecular mechanics (MM) molecular dynamics simulations (MDs) have been performed to directly observe the chemical reactions occurring between atomic oxygen and a NaCl solution at the gas-liquid interface using a model containing 10,800 atoms. During simulations, the atoms in the QM and MM Parts are dynamically adjusted. To examine the effects of local microenvironments on the chemical processes, atomic oxygen is used as a chemical probe to scan the gas-liquid interface. The excited atomic oxygen reacts with water molecules and Cl- ions to produce H2O2, OH, HOCl, ClO-, and HO2-/H3O+ species. The ground-state atomic oxygen is significantly more stable than the excited atomic oxygen, although it can react with water molecules to produce OH radicals. However, the branch ratio of ClO- computed for triplet atomic oxygen is significantly larger than that determined for singlet atomic oxygen. This study can help achieve a better understanding of the fundamental chemical processes during plasma-treated solution experiments and promotes advances in applications of QM/MM calculations at the gas-liquid interface.
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Affiliation(s)
- Shaofeng Xu
- College of Science, Donghua University, Shanghai 201620, People's Republic of China; Member of Magnetic Confinement Fusion Research Center, Ministry of Education of the People's Republic of China, Shanghai 201620, People's Republic of China.
| | - Xuanying Guo
- College of Science, Donghua University, Shanghai 201620, People's Republic of China; Member of Magnetic Confinement Fusion Research Center, Ministry of Education of the People's Republic of China, Shanghai 201620, People's Republic of China
| | - Juan Wang
- College of Science, Donghua University, Shanghai 201620, People's Republic of China; Member of Magnetic Confinement Fusion Research Center, Ministry of Education of the People's Republic of China, Shanghai 201620, People's Republic of China
| | - Ying Guo
- College of Science, Donghua University, Shanghai 201620, People's Republic of China; Member of Magnetic Confinement Fusion Research Center, Ministry of Education of the People's Republic of China, Shanghai 201620, People's Republic of China
| | - Jianjun Shi
- Yiwu Research Institute of Fudan University, Yiwu 322099, People's Republic of China
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Dupont V, Ognier S, Morand G, Ollivier C, Fensterbank L, Tatoulian M. Direct Amination of Benzene with Ammonia by Flow Plasma Chemistry. Chemistry 2023; 29:e202301666. [PMID: 37431686 DOI: 10.1002/chem.202301666] [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: 05/25/2023] [Revised: 07/07/2023] [Accepted: 07/10/2023] [Indexed: 07/12/2023]
Abstract
Amine derivatives, including aniline and allylic amines, can be formed in a single-step process from benzene and an ammonia plasma in a microreactor. Different process parameters such as temperature, residence time, and plasma power were evaluated to improve the reaction yield and its selectivity toward aminated products and avoid hydrogenated or oligomerized products. In parallel, simulation studies of the process have been carried out to propose a global mechanism and gain a better understanding of the influence of the different process parameters. The exploration of diverse related alkenes showed that the double bonds, conjugation, and aromatization influenced the amination mechanism. Benzene was the best reactant for amination based on the lifetime of radical intermediates. Under optimized conditions, benzene was aminated in the absence of catalyst with a yield of 3.8 % and a selectivity of 49 % in various amino compounds.
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Affiliation(s)
- Victor Dupont
- Institut de Recherche de Chimie Paris, UMR 8247, 2PM group, Chimie ParisTech-PSL, PSL Université Paris, CNRS, 11 rue Pierre et Marie Curie, 75005, Paris, France
| | - Stéphanie Ognier
- Institut de Recherche de Chimie Paris, UMR 8247, 2PM group, Chimie ParisTech-PSL, PSL Université Paris, CNRS, 11 rue Pierre et Marie Curie, 75005, Paris, France
| | - Gabriel Morand
- Institut de Recherche de Chimie Paris, UMR 8247, 2PM group, Chimie ParisTech-PSL, PSL Université Paris, CNRS, 11 rue Pierre et Marie Curie, 75005, Paris, France
| | - Cyril Ollivier
- Institut Parisien de Chimie Moléculaire, UMR 8232, MACO group, Sorbonne Université, CNRS, 4 place Jussieu, 75005, Paris, France
| | - Louis Fensterbank
- Institut Parisien de Chimie Moléculaire, UMR 8232, MACO group, Sorbonne Université, CNRS, 4 place Jussieu, 75005, Paris, France
| | - Michael Tatoulian
- Institut de Recherche de Chimie Paris, UMR 8247, 2PM group, Chimie ParisTech-PSL, PSL Université Paris, CNRS, 11 rue Pierre et Marie Curie, 75005, Paris, France
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Navaneetha Pandiyaraj K, Vasu D, Raji A, Ghobeira R, Saadat Esbah Tabaei P, De Geyter N, Morent R, Ramkumar M, Pichumani M, Deshmukh R. Combined effects of direct plasma exposure and pre-plasma functionalized metal-doped graphene oxide nanoparticles on wastewater dye degradation. J IND ENG CHEM 2023. [DOI: 10.1016/j.jiec.2023.02.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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