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Dong Z, Francisco JS, Long B. Ammonolysis of Glyoxal at the Air-Water Nanodroplet Interface. Angew Chem Int Ed Engl 2024; 63:e202316060. [PMID: 38084872 DOI: 10.1002/anie.202316060] [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: 10/23/2023] [Indexed: 01/04/2024]
Abstract
The reactions of glyoxal (CHO)2 ) with amines in cloud processes contribute to the formation of brown carbon and oligomer particles in the atmosphere. However, their molecular mechanisms remain unknown. Herein, we investigate the ammonolysis mechanisms of glyoxal with amines at the air-water nanodroplet interface. We identified three and two distinct pathways for the ammonolysis of glyoxal with dimethylamine and methylamine by using metadynamics simulations at the air-water nanodroplet interface, respectively. Notably, the stepwise pathways mediated by the water dimer for the reactions of glyoxal with dimethylamine and methylamine display the lowest free energy barriers of 3.6 and 4.9 kcal ⋅ mol-1 , respectively. These results showed that the air-water nanodroplet ammonolysis reactions of glyoxal with dimethylamine and methylamine were more feasible and occurred at faster rates than the corresponding gas phase ammonolysis, the OH+(CHO)2 reaction, and the aqueous phase reaction of glyoxal, leading to the dominant removal of glyoxal. Our results provide new and important insight into the reactions between carbonyl compounds and amines, which are crucial in forming nitrogen-containing aerosol particles.
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Affiliation(s)
- Zegang Dong
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, China
- School of Materials Science and Engineering, Guizhou Minzu University, Guiyang, 550025, China
| | - Joseph S Francisco
- Department of Earth and Environmental Sciences and Department of Chemistry, University of Pennsylvania, Philadelphia, PA-19104, USA
| | - Bo Long
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, China
- School of Materials Science and Engineering, Guizhou Minzu University, Guiyang, 550025, China
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Biswas S, Wong BM. Beyond Conventional Density Functional Theory: Advanced Quantum Dynamical Methods for Understanding Degradation of Per- and Polyfluoroalkyl Substances. ACS ES&T ENGINEERING 2024; 4:96-104. [PMID: 38229882 PMCID: PMC10788865 DOI: 10.1021/acsestengg.3c00216] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 08/18/2023] [Accepted: 08/21/2023] [Indexed: 01/18/2024]
Abstract
Computational chemistry methods, such as density functional theory (DFT), have now become more common in environmental research, particularly for simulating the degradation of per- and polyfluoroalkyl substances (PFAS). However, the vast majority of PFAS computational studies have focused on conventional DFT approaches that only probe static, time-independent properties of PFAS near stationary points on the potential energy surface. To demonstrate the rich mechanistic information that can be obtained from time-dependent quantum dynamics calculations, we highlight recent studies using these advanced techniques for probing PFAS systems. We briefly discuss recent applications ranging from ab initio molecular dynamics to DFT-based metadynamics and real-time time-dependent DFT for probing PFAS degradation in various reactive environments. These quantum dynamical approaches provide critical mechanistic information that cannot be gleaned from conventional DFT calculations. We conclude with a perspective of promising research directions and recommend that these advanced quantum dynamics simulations be more widely used by the environmental research community to directly probe PFAS degradation dynamics and other environmental processes.
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Affiliation(s)
- Sohag Biswas
- Materials Science & Engineering
Program, Department of Chemistry, and Department of Physics &
Astronomy, University of California-Riverside, Riverside, California 92521, United States
| | - Bryan M. Wong
- Materials Science & Engineering
Program, Department of Chemistry, and Department of Physics &
Astronomy, University of California-Riverside, Riverside, California 92521, United States
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Do TH, Tong HD, Tran KQ, Meijer EJ, Trinh TT. Insight into the role of excess hydroxide ions in silicate condensation reactions. Phys Chem Chem Phys 2023; 25:12723-12733. [PMID: 37114395 DOI: 10.1039/d3cp00475a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
The formation of silicate oligomers in the early stages is key to zeolite synthesis. The pH and the presence of hydroxide ions are important in regulating the reaction rate and the dominant species in solutions. This paper describes the formation of silicate species, from dimers to 4-membered rings, using ab initio molecular dynamics simulations in explicit water molecules with an excess hydroxide ion. The thermodynamic integration method was used to calculate the free energy profile of the condensation reactions. The hydroxide group's role is not only to control the pH of the environment, but also to actively participate in the condensation reaction. The results show that the most favorable reactions are linear-tetramer and 4-membered-ring formation, with overall barriers of 71 kJ mol-1 and 73 kJ mol-1, respectively. The formation of trimeric silicate, with the largest free-energy barrier of 102 kJ mol-1, is the rate-limiting step under these conditions. The excess hydroxide ion aids in the stabilization of the 4-membered-ring structure over the 3-membered-ring structure. Due to a relatively high free-energy barrier, the 4-membered ring is the most difficult of the small silicate structures to dissolve in the backward reaction. This study is consistent with the experimental observation that silicate growth in zeolite synthesis is slower in a very-high-pH environment.
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Affiliation(s)
- Tuong Ha Do
- Faculty of Applied Sciences, Ton Duc Thang University, 19 Nguyen Huu Tho, Tan Phong ward, District 7, Ho Chi Minh City, Vietnam.
| | - Hien Duy Tong
- Faculty of Engineering, Vietnamese-German University (VGU), Thu Dau Mot City, Binh Duong Province, Vietnam
| | - Khanh-Quang Tran
- Department of Energy and Process Engineering, Norwegian University of Science and Technology, Kolbjørn Hejes vei 1B, NO- 7491 Trondheim, Norway
| | - Evert Jan Meijer
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Amsterdam, The Netherlands.
| | - Thuat T Trinh
- Porelab, Department of Chemistry, Norwegian University of Science and Technology, Høgskoleringen 5, 7491-Trondheim, Norway.
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Dasgupta N, Ho TA, Rempe SB, Wang Y. Hydrophobic Nanoconfinement Enhances CO 2 Conversion to H 2CO 3. J Phys Chem Lett 2023; 14:1693-1701. [PMID: 36757174 DOI: 10.1021/acs.jpclett.3c00124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Understanding the formation of H2CO3 in water from CO2 is important in environmental and industrial processes. Although numerous investigations have studied this reaction, the conversion of CO2 to H2CO3 in nanopores, and how it differs from that in bulk water, has not been understood. We use ReaxFF metadynamics molecular simulations to demonstrate striking differences in the free energy of CO2 conversion to H2CO3 in bulk and nanoconfined aqueous environments. We find that nanoconfinement not only reduces the energy barrier but also reverses the reaction from endothermic in bulk water to exothermic in nanoconfined water. Also, charged intermediates are observed more often under nanoconfinement than in bulk water. Stronger solvation and more favorable proton transfer with increasing nanoconfinement enhance the thermodynamics and kinetics of the reaction. Our results provide a detailed mechanistic understanding of an important step in the carbonation process, which depends intricately on confinement, surface chemistry, and CO2 concentration.
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Affiliation(s)
- Nabankur Dasgupta
- Geochemistry Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Tuan A Ho
- Geochemistry Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Susan B Rempe
- Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Yifeng Wang
- Nuclear Waste Disposal Research and Analysis Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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Chen G, Zhao H, Li X, Xia S. Theoretical insights into the adsorption mechanism of Cd(II) on the basal surfaces of kaolinite. JOURNAL OF HAZARDOUS MATERIALS 2022; 422:126795. [PMID: 34399208 DOI: 10.1016/j.jhazmat.2021.126795] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 05/25/2021] [Accepted: 07/29/2021] [Indexed: 06/13/2023]
Abstract
Retardation of Cd(II) migration is an ongoing concern for environmental remediation, but a prevalent obstacle of the procedure originates from the lack of an atomic-scale description of the inherent mechanism for Cd(II) adsorption at mineral-water interfaces. Herein, we performed first-principles calculations and ab initio molecular dynamics (AIMD) simulations to explore the adsorption mechanism of Cd(II) on the basal surfaces of kaolinite. Representative monodentate and bidentate Cd(II) complexes were constructed on the Kln-Al(001) and Kln-Si(001̅) surfaces. The results showed that bidentate coordination of Cd(II) on the Kln-Al(001) surface was superior to all other studied models due to the favorable formation energy and better agreement with EXAFS data. The calculated electron density difference revealed the charge transfer from surface oxygen (Os) to Cd(II) upon adsorption. In particular, partial density of states (PDOS) analysis indicated that the Cd-Os bond exhibited covalent characteristics, attributed to the overlaps of Cd-5p and Os-2p orbitals in the valence band. Furthermore, radial distribution functions supported by AIMD simulations were employed to confirm the structural features of Cd(II) coordination shell at kaolinite-water interfaces. This theoretical study provides insightful guidance for future Cd(II) research to improve current assessments of contaminant remediation.
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Affiliation(s)
- Guobo Chen
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266003, China
| | - Haizhou Zhao
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266003, China; Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
| | - Xia Li
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266003, China.
| | - Shuwei Xia
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266003, China; Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China.
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Myllys N, Myers D, Chee S, Smith JN. Molecular properties affecting the hydration of acid-base clusters. Phys Chem Chem Phys 2021; 23:13106-13114. [PMID: 34060578 DOI: 10.1039/d1cp01704g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the atmosphere, water in all phases is ubiquitous and plays important roles in catalyzing atmospheric chemical reactions, participating in cluster formation and affecting the composition of aerosol particles. Direct measurements of water-containing clusters are limited because water is likely to evaporate before detection, and therefore, theoretical tools are needed to study hydration in the atmosphere. We have studied thermodynamics and population dynamics of the hydration of different atmospherically relevant base monomers as well as sulfuric acid-base pairs. The hydration ability of a base seems to follow in the order of gas-phase base strength whereas hydration ability of acid-base pairs, and thus clusters, is related to the number of hydrogen binding sites. Proton transfer reactions at water-air interfaces are important in many environmental and biological systems, but a deeper understanding of their mechanisms remain elusive. By studying thermodynamics of proton transfer reactions in clusters containing up to 20 water molecules and a base molecule, we found that that the ability of a base to accept a proton in a water cluster is related to the aqueous-phase basicity. We also studied the second deprotonation reaction of a sulfuric acid in hydrated acid-base clusters and found that sulfate formation is most favorable in the presence of dimethylamine. Molecular properties related to the proton transfer ability in water clusters are discussed.
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Affiliation(s)
- Nanna Myllys
- Department of Chemistry, University of California, Irvine, California 92617, USA and Department of Chemistry, University of Jyväskylä, Jyväskylä 40014, Finland.
| | - Deanna Myers
- Department of Chemistry, University of California, Irvine, California 92617, USA
| | - Sabrina Chee
- Department of Chemistry, University of California, Irvine, California 92617, USA
| | - James N Smith
- Department of Chemistry, University of California, Irvine, California 92617, USA
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Ab initio metadynamics calculations reveal complex interfacial effects in acetic acid deprotonation dynamics. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115624] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Han Y, Zhu L, Yao Y, Shi X, Zhang Y, Xiao H, Chen X. Strong bases behave as weak bases in nanoscale chemical environments: implication in humidity-swing CO 2 air capture. Phys Chem Chem Phys 2021; 23:14811-14817. [PMID: 34212971 DOI: 10.1039/d1cp01121a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydration of ions/molecules in nanometer-sized clusters or nanoscopic pores is ubiquitous and plays a key role in many chemical and physical systems. In this work, guanidine-H2O reactions with n = 1-8 water molecules were systematically studied by ab initio methods. The result suggests that the reduced availability of water molecules greatly inhibits the strong base guanidine from producing OH-. That is, guanidine exhibits the behavior of a weak bases in low-humidity nanoscale environments. Intriguingly, this effect is not limited to guanidine but could be applied to other strong bases. Furthermore, we demonstrate that the direction of guanidine-CO2 reactions can be controlled by changing the number of water molecules present, which in turn responds to the humidity change in air. These findings not only shed some light on unconventional chemical reactions of strong bases in atmospheric clusters and on solid porous surfaces, but also provide insights into the development of guanidine-based CO2 air-capture sorbents.
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Affiliation(s)
- Yingying Han
- Shaanxi Institute of Energy and Chemical Engineering, School of Chemical Engineering, Northwest University, Xi'an, 710069, China.
| | - Liangliang Zhu
- Shaanxi Institute of Energy and Chemical Engineering, School of Chemical Engineering, Northwest University, Xi'an, 710069, China.
| | - Yutong Yao
- Earth Engineering Center, Center for Advanced Materials for Energy and Environment, Department of Earth and Environmental Engineering, Columbia University, New York, NY10027, USA
| | - Xiaoyang Shi
- Earth Engineering Center, Center for Advanced Materials for Energy and Environment, Department of Earth and Environmental Engineering, Columbia University, New York, NY10027, USA
| | - Yayun Zhang
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Hang Xiao
- Shaanxi Institute of Energy and Chemical Engineering, School of Chemical Engineering, Northwest University, Xi'an, 710069, China.
| | - Xi Chen
- Earth Engineering Center, Center for Advanced Materials for Energy and Environment, Department of Earth and Environmental Engineering, Columbia University, New York, NY10027, USA
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