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Shi L, Zhu Z, Wu N, Chang Y, Yue L, An L. Adsorption characteristics of SO 2 onto novel activated carbon fixed bed: kinetics, isotherms, thermodynamics and washing regeneration. ENVIRONMENTAL TECHNOLOGY 2024; 45:5182-5203. [PMID: 37955429 DOI: 10.1080/09593330.2023.2283810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Accepted: 09/09/2023] [Indexed: 11/14/2023]
Abstract
The problem of SO2 pollution in industrial flue gas has brought great pressure to environmental governance. In this study, a new type of activated carbon fixed bed device was designed and built for flue gas desulfurization. The results showed that activated carbons (AC1-AC5) were microporous activated carbons with abundant functional groups on the surface, and the desulfurization performance was ranked as AC1 > AC2 > AC3 > AC4 > AC5. The specific surface area of AC1 was as high as 624.98 m2/g, and the maximum adsorption capacity was 29.03 mg·g-1 under the optimum reaction conditions. The Freundlich adsorption isotherm model and Bangham pore diffusion model are more suitable for describing the dynamic adsorption process of SO2 on AC1. Combined with thermodynamic research, it is shown that the adsorption process of SO2 is a spontaneous, exothermic, and chaotic reduction process, which is mainly a physical adsorption between single-layer adsorption and multi-layer adsorption. Finally, the desulfurization-washing regeneration cycle experiment results showed that the regeneration rate of AC1 increases with the washing time and washing temperature, up to 95%, which provides data reference for industrial application.
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Affiliation(s)
- Ling Shi
- Hubei Key Laboratory of Industrial fume and Dust Pollution Control, School of Environment and Health, Jianghan University, Wuhan, People's Republic of China
| | - Zhongkui Zhu
- Hubei Key Laboratory of Industrial fume and Dust Pollution Control, School of Environment and Health, Jianghan University, Wuhan, People's Republic of China
| | - Nana Wu
- Hubei Key Laboratory of Industrial fume and Dust Pollution Control, School of Environment and Health, Jianghan University, Wuhan, People's Republic of China
| | - Yufeng Chang
- Hubei Key Laboratory of Industrial fume and Dust Pollution Control, School of Environment and Health, Jianghan University, Wuhan, People's Republic of China
| | - Lin Yue
- Hubei Key Laboratory of Industrial fume and Dust Pollution Control, School of Environment and Health, Jianghan University, Wuhan, People's Republic of China
| | - Liang An
- Hubei Key Laboratory of Industrial fume and Dust Pollution Control, School of Environment and Health, Jianghan University, Wuhan, People's Republic of China
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Li X, Meng L, Yang F, Yang Z, Li J, Chen Y, Ji X. Tuning the structure of N-methyldiethanolamine-based deep eutectic solvents for efficient and reversible SO 2 capture. Chem Commun (Camb) 2024; 60:10560-10563. [PMID: 39229816 DOI: 10.1039/d4cc03373f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/05/2024]
Abstract
Three cheap DESs comprising of N-methyldiethanolamine (MDEA) and imidazole (Im), 1,2,4-triazole, and tetrazole were investigated for capturing SO2 at low concentrations. Surprisingly, with the addition of Im, the SO2 absorption capacity and desorption efficiency were improved. Spectroscopic analysis and quantum chemical calculations confirmed that MDEA-Im effectively and reversibly captured SO2 through the hydrogen bond network and synergistic action between MDEA and Im.
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Affiliation(s)
- Xueqi Li
- College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Lingqiang Meng
- College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Fuliu Yang
- College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Zhuhong Yang
- College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Jun Li
- College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Yifeng Chen
- College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
- Institute of Chemical Industry of Forest Products, CAF, National Engineering Laboratory for Biomass Chemical Utilization, Key and Open Laboratory of Forest Chemical Engineering, SFA, Key Laboratory of Biomass Energy and Material, Nanjing 210042, China
| | - Xiaoyan Ji
- Energy Engineering, Division of Energy Science, Luleå University of Technology, Luleå 97187, Sweden
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Wan L, Wang K, Chen Y, Xu Z, Zhao W. Aminoalkyl organosilicon with dual chemical sites for SO 2 absorption and analysis of site-specific absorption entropy and enthalpy. JOURNAL OF HAZARDOUS MATERIALS 2024; 464:132946. [PMID: 37956565 DOI: 10.1016/j.jhazmat.2023.132946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 10/09/2023] [Accepted: 11/04/2023] [Indexed: 11/15/2023]
Abstract
Wet flue gas desulfurization is widely used for its high efficiency, however, the low absorption capacity, high viscosity and poor thermal stability of absorbents remains an open question. Herein, a low viscosity and high thermal stability SO2 absorbent with dual interacting sites was synthesized by introducing phenyl into organic silicon. The thermal stability of 1,5-bis (diethylamino)- 1,1,5,5-tetramethyl-3,3-diphenyltrisiloxane (BADPS) is comparable to ILs, while its viscosity is much lower than that of ILs. For the first time, we use a variant of the pseudo-first-order reaction rate equation obtained the reaction rate constant and the saturation absorption capacity. In addition, the optimal absorption and desorption temperatures were obtained based on an objective function. Mostly importantly, the absorption enthalpy change (ΔH) and entropy change (ΔS) of BADPS absorption reaction show the highest absolute values of SO2 absorbents reported so far. These results indicated that the prepared amine alkyl organosilicon could serve as a promising desulfurizing agent with low-energy consumption.
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Affiliation(s)
- Lurui Wan
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Kai Wang
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Yuan Chen
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Zhiyong Xu
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, PR China.
| | - Wenbo Zhao
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, PR China.
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Kim K, Lim H, Park HS, Kang JH, Park J, Song H. Reversible sulfur dioxide capture by amino acids containing a single amino group at low sulfur dioxide concentrations. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:52013-52025. [PMID: 36823467 DOI: 10.1007/s11356-023-25982-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 02/13/2023] [Indexed: 06/18/2023]
Abstract
SO2, an air pollutant, is harmful to human health and causes air pollution; therefore, numerous studies have focused on the development of SO2 control technologies. Although limestone- and ammonia-based absorbents have been widely used in wet desulfurization, they are difficult to regenerate and do not enable the recycling of SO2, which is a useful resource. Recently, amino acids have attracted attention as reversible SO2 absorbents because they are eco-friendly and have excellent reactivity with SO2, as well as high regeneration performance. Glycine, L-alanine, β-alanine, 4-aminobutyric acid, 5-aminovaleric acid, and 6-aminohexanoic acid were analyzed to investigate the relationship between SO2 absorption and the amino acid molecular structure using the simulated actual flue gas (200 ppmv SO2 + 13% CO2 in N2 balance). The SO2 absorption of amino acids (with the molecular structure of glycine and alkyl chains of various lengths) improved as the alkyl chain length increased, possibly owing to a decrease in the inductive effect in the molecular structure of the amino acid. Furthermore, 13C-nuclear magnetic resonance spectroscopy was conducted to analyze the SO2 absorption reaction mechanism (including the possible generation of irreversible species), and experiments involving a number of consecutive absorption-desorption cycles were used to confirm the reusability of the amino acids. The tested amino acids exhibited higher cyclic capacities compared to those of deep eutectic solvents and ionic liquids reported in the literature, thereby exhibiting excellent potential as SO2 absorbents. Thus, this study can guide the future design and development of eco-friendly SO2 absorbents.
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Affiliation(s)
- Kwanghwi Kim
- Green Materials & Processes R&D Group, Korea Institute of Industrial Technology, 55 Jongga-Ro, Jung-Gu, Ulsan, 44413, South Korea
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-Gu, Seoul, 03722, South Korea
| | - Hyunji Lim
- Green Materials & Processes R&D Group, Korea Institute of Industrial Technology, 55 Jongga-Ro, Jung-Gu, Ulsan, 44413, South Korea
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-Gu, Seoul, 03722, South Korea
| | - Hyun Sic Park
- Green Materials & Processes R&D Group, Korea Institute of Industrial Technology, 55 Jongga-Ro, Jung-Gu, Ulsan, 44413, South Korea
| | - Jo Hong Kang
- Green Materials & Processes R&D Group, Korea Institute of Industrial Technology, 55 Jongga-Ro, Jung-Gu, Ulsan, 44413, South Korea
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-Gu, Seoul, 03722, South Korea
| | - Jinwon Park
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-Gu, Seoul, 03722, South Korea
| | - Hojun Song
- Green Materials & Processes R&D Group, Korea Institute of Industrial Technology, 55 Jongga-Ro, Jung-Gu, Ulsan, 44413, South Korea.
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Siami H, Razmkhah M, Moosavi F. Cation functional group effect on SO 2 absorption in amino acid ionic liquids. Front Chem 2023; 11:1113394. [PMID: 36817168 PMCID: PMC9932779 DOI: 10.3389/fchem.2023.1113394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 01/19/2023] [Indexed: 02/05/2023] Open
Abstract
Introduction: The effect of the functional group of the cation on SO2 acidic gas absorption by some designed amino acid ionic liquids (AAILs) was studied. Methods: An isolated pair of glycinate anion and pristine imidazolium-based cation, as well as decorated cation functionalized by hydroxyl (OH), amine (NH2), carboxylic acid (COOH), methoxy (OCH3), and acetate (CH3COO) groups, were structurally optimized by density functional theory (DFT) using split-valence triple-zeta Pople basis set. Results and Discussion: The binding and Gibbs free energy (ΔGint) values of SO2 absorption show the AAIL functionalized by the COOH group is the most thermodynamically favorable green solvent and this functional group experiences the closest distance between anion and captured SO2 and vice versa in the case of cation … SO2 which may be the main reason for being the best absorbent; in addition, the highest net charge-transfer amount of SO2 is observed. Comparing the non-covalent interaction of the systems demonstrates that the strongest hydrogen bond between captured gas and anion, as well as π-hole, and van der Waals (vdW) interaction play critical roles in gas absorption; besides, the COOH functional group decreases the steric effect while the CH3COO functional group significantly increases steric effect after absorption that declines the hydrogen bond.
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Affiliation(s)
- Hasan Siami
- Department of Chemistry, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Mohammad Razmkhah
- Salim Green Health R&D, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Fatemeh Moosavi
- Department of Chemistry, Ferdowsi University of Mashhad, Mashhad, Iran,*Correspondence: Fatemeh Moosavi,
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Pan Y, Liu Y, Zhang X, Shi M, Tu Z, Hu X, Wu Y. Design of deep eutectic solvents with multiple-active-sites for HCl separation and storage. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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