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Sui H, Li X, Cai J, Deng S, Xu E, Xue F, Xie H. Study on the mechanism of methane "solid-liquid-gas" conversion controlled by the evolution of coal micro- and nanopore structure. Sci Rep 2024; 14:11473. [PMID: 38769099 PMCID: PMC11106246 DOI: 10.1038/s41598-024-62193-x] [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: 03/11/2024] [Accepted: 05/14/2024] [Indexed: 05/22/2024] Open
Abstract
Currently, the utilization of coalbed methane resources in the Guizhou region faces challenges such as complex reservoir structure, high gas content, and microporous development. Based on these, the pore structure and adsorption capacity of Guizhou tectonic deformed coals (TDCs) were evaluated using a suite of integrated diagnostic techniques including low-temperature nitrogen adsorption (LT-N2A), mercury intrusion porosimetry (MIP), methane isothermal adsorption. Through the above methods, the pore structure and adsorption characteristics of the samples were characterized; The samples were divided into the range of joint pores by combining the results of MIP and LT-N2A; Using the molecular simulation software, the 2 nm, 4 nm, 10 nm pores affecting the methane endowment state were investigated respectively, and from the perspective of the heat of adsorption and energy, the concept of the three-phase transition of methane was proposed, and explore the change of the pore spacing affecting the endowment state of methane from the solid state pore to the gas state pore. The results provide new ideas for the in-depth study of gas storage in tectonic coal reservoirs in Guizhou Province.
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Affiliation(s)
- Hao Sui
- College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China
- Mining College, Guizhou University, Guiyang, 550025, China
| | - Xijian Li
- College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China.
- Mining College, Guizhou University, Guiyang, 550025, China.
- Guizhou Engineering Center for Safe Mining Technology, Guiyang, 550025, China.
| | - Junjie Cai
- College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China
- Mining College, Guizhou University, Guiyang, 550025, China
| | - Sen Deng
- Mining College, Guizhou University, Guiyang, 550025, China
- Guizhou Engineering Center for Safe Mining Technology, Guiyang, 550025, China
| | - Enyu Xu
- Mining College, Guizhou University, Guiyang, 550025, China
- Guizhou Engineering Center for Safe Mining Technology, Guiyang, 550025, China
| | - Feng Xue
- Mining College, Guizhou University, Guiyang, 550025, China
- Guizhou Engineering Center for Safe Mining Technology, Guiyang, 550025, China
| | - Honggao Xie
- Mining College, Guizhou University, Guiyang, 550025, China
- Guizhou Engineering Center for Safe Mining Technology, Guiyang, 550025, China
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Wang C, Xie J, Zheng M, Zhu J, Shi C. Preparation of Mesoporous Biochar from Cornstalk for the Chromium (VI) Elimination by Using One-Step Hydrothermal Carbonation. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2021; 2021:3418887. [PMID: 34650824 PMCID: PMC8510798 DOI: 10.1155/2021/3418887] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 08/17/2021] [Accepted: 09/16/2021] [Indexed: 06/13/2023]
Abstract
Hydrothermal carbon (HTC) was prepared by the one-step hydrothermal method for Cr (VI) removal from wastewater, which was considered a "green chemistry" method. The specific surface area (SBET) of HTC was 85 m2/g with the pore size in range of 2.0-24.0 nm. FT-IR spectra analysis showed that the HTC had abundant chemical surface functional groups. The influence of adsorption parameters such as pH, HTC dosage, Cr (VI) concentration, and contact time on the removal efficiency of Cr (VI) had been investigated. When the initial concentration was 50 mg/L, pH = 6, amount of adsorbent was 0.2 g/50 ml, and adsorption time was 90 min; the Cr (VI) absorbed rate of HTC reached 98%. Batch adsorption experiments indicated that Cr (VI) adsorption data of HTC fitted the Freundlich isothermal and pseudo-second-order kinetic models. Overall, our findings provide a promising material in treatment of Cr (VI)-rich wastewater and give a clear picture of its application, which is worthy of further study.
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Affiliation(s)
- Chao Wang
- Department of Materials Science and Engineering, Anhui University of Science & Technology, Huainan, China
| | - Jun Xie
- Department of Materials Science and Engineering, Anhui University of Science & Technology, Huainan, China
| | - Mingdong Zheng
- Department of Materials Science and Engineering, Anhui University of Science & Technology, Huainan, China
| | - Jinbo Zhu
- Department of Materials Science and Engineering, Anhui University of Science & Technology, Huainan, China
| | - Changliang Shi
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, China
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