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Li Q, Li F, Yang Y, Yan H, Yu C, Zheng M, Chen H. Carbon Nanosheet Preparation By Low-Temperature Two-Step Carbonization: A Study of Their Properties and Mechanism of Adsorption of Oxidized H 2S. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:17547-17558. [PMID: 39118224 DOI: 10.1021/acs.langmuir.4c01769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/10/2024]
Abstract
Straw, as a kind of biomass waste, has the advantages of low cost and abundant storage, which makes it a promising renewable resource. Using rice straw as a carbon source, carbon nanosheets were prepared by a two-step carbonization method combining low-temperature pyrolysis and low-temperature hydrothermal, and they were used as H2S removal agents. The results showed that during the two-step carbonization process, the adsorption performance of carbon nanosheets for H2S showed a tendency of enhancing and then weakening with the increase of pyrolysis temperature in the first step, and the sulfur capacity could reach 3.1 mg/g at the maximum of the pyrolysis temperature of 200 °C, which was superior to or close to that of the modified or activated carbon. The XPS, EPR, and CO2-TPD tests showed that the surface of carbon nanosheets was alkaline, containing a large number of hydroxyl groups and the presence of phenoxy persistent free radicals or semiquinone persistent free radicals. It was analyzed that the direct or indirect oxidation of H2S by the persistent radicals under an alkaline environment could convert the -2-valent sulfur into -1-, 0- and +6-valent sulfur to realize the adsorption and removal of H2S. This work, while offering the possibility of utilizing carbon nanosheets made from straw as a material for H2S adsorption and removal, also expands the application of straw waste in exhaust gas treatment.
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Affiliation(s)
- Qiushuang Li
- Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, P. R. China
| | - Fen Li
- Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, P. R. China
| | - Ying Yang
- Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, P. R. China
| | - Hong Yan
- Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, P. R. China
| | - Cailian Yu
- Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, P. R. China
| | - Menglong Zheng
- Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, P. R. China
| | - Huiyu Chen
- Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, P. R. China
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Li W, Cheng C, Gao G, Xu H, Huang W, Qu Z, Yan N. Trace SO 2 capture within the engineered pore space using a highly stable SnF 62--pillared MOF. MATERIALS HORIZONS 2024; 11:1889-1898. [PMID: 38372122 DOI: 10.1039/d3mh02222f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/20/2024]
Abstract
Developing reliable solid sorbents for efficient capture and removal of trace sulfur dioxide (SO2) under ambient conditions is critical for industrial desulfurization operations, but poses a great challenge. Herein, we focus on SNFSIX-Cu-TPA, a highly stable fluorinated MOF that utilizes SnF62- as pillars, for effectively capturing SO2 at extremely low pressures. The exceptional affinity of SNFSIX-Cu-TPA towards SO2 over CO2 and N2 was demonstrated through single-component isotherms and corroborated by computational simulations. At 298 K and 0.002 bar, this material displays a remarkable gas uptake of 2.22 mmol g-1. Among various anion fluorinated MOFs, SNFSIX-Cu-TPA shows the highest SO2/MF62- of 1.39 mmol mmol-1 and exhibits a low Qst of 58.81 kJ mol-1. Additionally, SNFSIX-Cu-TPA displays excellent potential for SO2/CO2 separation, as evidenced by its ideal adsorbed solution theory (IAST) selectivity of 148 at a molar fraction of SO2 of 0.01. Dynamic breakthrough curves were obtained to reveal the effective removal of trace SO2 from simulated flue gas (SO2/CO2/N2; v/v/v 0.2/10/89.8) with a high dynamic capacity of up to 1.52 mmol g-1. Furthermore, in situ TGA demonstrated the efficient and reversible capture of 500 ppm SO2 over 20 adsorption-desorption tests. This durable material presents a rare combination of exceptional SO2 capturing performance, good adsorption selectivity, and mild regeneration, thus making it a good candidate for a realistic desulfurization process.
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Affiliation(s)
- Weiwei Li
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
| | - Can Cheng
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
| | - Guanqun Gao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
| | - Haomiao Xu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
| | - Wenjun Huang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
| | - Zan Qu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
| | - Naiqiang Yan
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
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Gupta NK, Leyva C, Viltres H, Dhavale RP, Kim KS, Romero-Galarza A, Park HH. Zinc-aluminum layered double hydroxide and double oxide for room-temperature oxidation of sulfur dioxide gas. CHEMOSPHERE 2023; 338:139503. [PMID: 37453522 DOI: 10.1016/j.chemosphere.2023.139503] [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: 03/17/2023] [Revised: 07/09/2023] [Accepted: 07/12/2023] [Indexed: 07/18/2023]
Abstract
Sulfur dioxide (SO2) gas at trace levels challenges the consumption of fuel gases and cleaning of flue gases originating from diverse anthropogenic sources. We have demonstrated Zn-Al layered double hydroxide (LDH) and layered double oxide (LDO) as low-cost and effective adsorbents in removing lowly concentrated SO2 gas at room temperature. Water in the adsorbent bed significantly improved the performance, where the maximum adsorption capacity of 38.0 mg g-1 was achieved for LDO. Based on the spectroscopic findings, the adsorbed gas molecules were oxidized to surface-bound sulfate/bisulfate species, showing complete mineralization of SO2 molecules. By employing an inexpensive NaOH-H2O2 solution-based regeneration strategy, we successfully regenerated the spent LDO, significantly restoring its gas uptake capacity. The regenerated oxide exhibited an increased gas uptake capacity ranging from 38.0 to 98.5 mg g-1, highlighting the practicality and economic feasibility of our approach. LDH/LDO materials are promising regenerable adsorbents for removing low concentrations of SO2 gas in ambient conditions.
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Affiliation(s)
- Nishesh Kumar Gupta
- Department of Environmental Research, University of Science and Technology (UST), Daejeon 34113, South Korea; Department of Environmental Research, Korea Institute of Civil Engineering and Building Technology (KICT), Goyang, 10223, South Korea
| | - Carolina Leyva
- Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Legaria.694, Col. Irrigación Miguel Hidalgo, Mexico City, CDMX, 11500, Mexico.
| | - Herlys Viltres
- School of Engineering Practice and Technology, McMaster University, 1280 Main Street West Hamilton, Ontario, L8S 4L8, Canada
| | - Rushikesh P Dhavale
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul, 03722, South Korea
| | - Kwang Soo Kim
- Department of Environmental Research, University of Science and Technology (UST), Daejeon 34113, South Korea; Department of Environmental Research, Korea Institute of Civil Engineering and Building Technology (KICT), Goyang, 10223, South Korea.
| | - Adolfo Romero-Galarza
- Departamento de Ingeniería Química, Facultad de Ciencias Químicas, Universidad Autónoma de Coahuila, Blvd. V. Carranza e Ing. José Cárdenas V. S/N, 25280, Saltillo, COAH, Mexico
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul, 03722, South Korea
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Zafari R, Mendonça FG, Tom Baker R, Fauteux-Lefebvre C. Efficient SO2 capture using an amine-functionalized, nanocrystalline cellulose-based adsorbent. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2022.122917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Novel application of sodium manganese oxide in removing acidic gases in ambient conditions. Sci Rep 2023; 13:2330. [PMID: 36759698 PMCID: PMC9911640 DOI: 10.1038/s41598-023-29274-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 02/01/2023] [Indexed: 02/11/2023] Open
Abstract
In this study, we have demonstrated the application of sodium manganese oxide for the chemisorption of toxic acidic gases at room temperature. The fabricated alkali ceramic has Na0.4MnO2, Na2Mn3O7, and NaxMnO2 phases with a surface area of 2.6 m2 g-1. Na-Mn oxide was studied for oxidation of H2S, SO2, and NO2 gases in the concentration range of 100-500 ppm. The material exhibited a high uptake capacity of 7.13, 0.75, and 0.53 mmol g-1 for H2S, SO2, and NO2 in wet conditions, respectively. The material was reusable when regenerated simply by soaking the spent oxide in a NaOH-H2O2 solution. While the H2S chemisorption process was accompanied by sulfide, sulfur, and sulfate formation, the SO2 chemisorption process yielded only sulfate ions. The NO2 chemisorption process was accomplished by its conversion to nitrite and nitrate ions. Thus, the present work is one of the first reports on alkali ceramic utilization for room-temperature mineralization of acidic gases.
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