Preparation of activated carbon-mesoporous silica composites from coal gangue and phase transformation during its preparation
Coal gangue, as a mixture of carbon, silicon and aluminum, can be used for the preparation of composite materials. It shows a good prospect as the preparation of composite materials can avoid the difficulties of element separation and impurity interference. In this paper, activated carbon-mesoporous...
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| Format: | Article |
| Language: | zho |
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Editorial Department of Coal Science and Technology
2023-09-01
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| Series: | Meitan kexue jishu |
| Subjects: | |
| Online Access: | http://www.mtkxjs.com.cn/article/doi/10.13199/j.cnki.cst.2022-1211 |
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| author | Hongwei LI Kezhou YAN Chaolu WEN Dandan LIU Yanxia GUO Yuanyuan ZHANG |
| author_facet | Hongwei LI Kezhou YAN Chaolu WEN Dandan LIU Yanxia GUO Yuanyuan ZHANG |
| author_sort | Hongwei LI |
| collection | DOAJ |
| description | Coal gangue, as a mixture of carbon, silicon and aluminum, can be used for the preparation of composite materials. It shows a good prospect as the preparation of composite materials can avoid the difficulties of element separation and impurity interference. In this paper, activated carbon-mesoporous silica composite (AC-SiO2) was prepared from coal gangue by alkali fusion, acid leaching and other processes. The effects of reaction conditions on the pore volume and specific surface area of coal gangue-based AC-SiO2 were investigated; then the phase transformation during the preparation of coal gangue-based AC-SiO2 was studied by means of X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The results showed that several experimental parameters of alkali fusion and acid leaching process were related to the pore volume and specific surface area of coal gangue-based AC-SiO2, among which the KOH-impregnated concentration, roasting temperature and HCl-leached concentration were the most important factors. The kaolinite and quartz in coal gangue would be transformed into potassium nepheline and potassium silicate phases, and the solid carbon would be transformed into activated carbon, when the KOH-impregnated concentration was ≥ 10.7 mol/L and the roasting temperature was ≥ 700 °C; AC-SiO2 was further formed by acid leaching process, when HCl-leached concentration ≥ 6.0 mol/L. At the optimized conditions, the conversion ratio of carbon and silicon in coal gangue is 90.28%, and the yield can reach 40.2%. The micropore and mesopore of AC-SiO2 were formed by the accumulation of lamellae (the micropores and mesopores account for 1/2, specific surface area was about 835.1 m2/g, average pore diameter was about 2.97 nm and total pore volume was about 0.62 cm3/g) was prepared. The prepared AC-SiO2 had obvious adsorption on the different molecular weight pollutants of methyl orange and Rhodamine B, and the adsorption capacity of methyl orange and Rhodamine B were exceed 99.01 mg/g and 99.87 mg/g, respectively. |
| first_indexed | 2024-03-09T14:16:14Z |
| format | Article |
| id | doaj.art-f3b64d6d43f44df98d28b210ca99626a |
| institution | Directory Open Access Journal |
| issn | 0253-2336 |
| language | zho |
| last_indexed | 2024-03-09T14:16:14Z |
| publishDate | 2023-09-01 |
| publisher | Editorial Department of Coal Science and Technology |
| record_format | Article |
| series | Meitan kexue jishu |
| spelling | doaj.art-f3b64d6d43f44df98d28b210ca99626a2023-11-29T01:42:04ZzhoEditorial Department of Coal Science and TechnologyMeitan kexue jishu0253-23362023-09-0151931031910.13199/j.cnki.cst.2022-12112022-1211Preparation of activated carbon-mesoporous silica composites from coal gangue and phase transformation during its preparationHongwei LI0Kezhou YAN1Chaolu WEN2Dandan LIU3Yanxia GUO4Yuanyuan ZHANG5Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030006, ChinaInstitute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030006, ChinaInstitute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030006, ChinaSchool of Environmental Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, ChinaInstitute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030006, ChinaInstitute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030006, ChinaCoal gangue, as a mixture of carbon, silicon and aluminum, can be used for the preparation of composite materials. It shows a good prospect as the preparation of composite materials can avoid the difficulties of element separation and impurity interference. In this paper, activated carbon-mesoporous silica composite (AC-SiO2) was prepared from coal gangue by alkali fusion, acid leaching and other processes. The effects of reaction conditions on the pore volume and specific surface area of coal gangue-based AC-SiO2 were investigated; then the phase transformation during the preparation of coal gangue-based AC-SiO2 was studied by means of X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The results showed that several experimental parameters of alkali fusion and acid leaching process were related to the pore volume and specific surface area of coal gangue-based AC-SiO2, among which the KOH-impregnated concentration, roasting temperature and HCl-leached concentration were the most important factors. The kaolinite and quartz in coal gangue would be transformed into potassium nepheline and potassium silicate phases, and the solid carbon would be transformed into activated carbon, when the KOH-impregnated concentration was ≥ 10.7 mol/L and the roasting temperature was ≥ 700 °C; AC-SiO2 was further formed by acid leaching process, when HCl-leached concentration ≥ 6.0 mol/L. At the optimized conditions, the conversion ratio of carbon and silicon in coal gangue is 90.28%, and the yield can reach 40.2%. The micropore and mesopore of AC-SiO2 were formed by the accumulation of lamellae (the micropores and mesopores account for 1/2, specific surface area was about 835.1 m2/g, average pore diameter was about 2.97 nm and total pore volume was about 0.62 cm3/g) was prepared. The prepared AC-SiO2 had obvious adsorption on the different molecular weight pollutants of methyl orange and Rhodamine B, and the adsorption capacity of methyl orange and Rhodamine B were exceed 99.01 mg/g and 99.87 mg/g, respectively.http://www.mtkxjs.com.cn/article/doi/10.13199/j.cnki.cst.2022-1211coal gangueactivated carbonmesoporous silicacomposite materialphase transformation |
| spellingShingle | Hongwei LI Kezhou YAN Chaolu WEN Dandan LIU Yanxia GUO Yuanyuan ZHANG Preparation of activated carbon-mesoporous silica composites from coal gangue and phase transformation during its preparation Meitan kexue jishu coal gangue activated carbon mesoporous silica composite material phase transformation |
| title | Preparation of activated carbon-mesoporous silica composites from coal gangue and phase transformation during its preparation |
| title_full | Preparation of activated carbon-mesoporous silica composites from coal gangue and phase transformation during its preparation |
| title_fullStr | Preparation of activated carbon-mesoporous silica composites from coal gangue and phase transformation during its preparation |
| title_full_unstemmed | Preparation of activated carbon-mesoporous silica composites from coal gangue and phase transformation during its preparation |
| title_short | Preparation of activated carbon-mesoporous silica composites from coal gangue and phase transformation during its preparation |
| title_sort | preparation of activated carbon mesoporous silica composites from coal gangue and phase transformation during its preparation |
| topic | coal gangue activated carbon mesoporous silica composite material phase transformation |
| url | http://www.mtkxjs.com.cn/article/doi/10.13199/j.cnki.cst.2022-1211 |
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