Novel composite in situ obtained from coal gasification coarse slag and its mechanism of removing phosphate
A novel low-cost hematite–silicon mesoporous composite (HSMC) was synthesized in situ from coal gasification coarse slag (CGCS) via acid modification and its potential for phosphate removal from wastewater was studied. Calcium, aluminum and iron in CGCS were activated by hydrochloric acid, and forme...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | Arabian Journal of Chemistry |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1878535222008280 |
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| author | Baoguo Yang Yilian Li Fenglan Han Yadong Bai Yonghong Zhang Jinhao Yu Zhongbiao Fu |
| author_facet | Baoguo Yang Yilian Li Fenglan Han Yadong Bai Yonghong Zhang Jinhao Yu Zhongbiao Fu |
| author_sort | Baoguo Yang |
| collection | DOAJ |
| description | A novel low-cost hematite–silicon mesoporous composite (HSMC) was synthesized in situ from coal gasification coarse slag (CGCS) via acid modification and its potential for phosphate removal from wastewater was studied. Calcium, aluminum and iron in CGCS were activated by hydrochloric acid, and formed crystalline hematite on the quartz and silicates substrates. Compared with traditional methods of preparing hematite, this in-situ preparation method effectively utilized the iron in CGCS instead of requiring added iron salts, which is highly cost-effective. The specific surface area increased from 4 m2/g for CGCS to 67 m2/g for HSMC, greatly enhancing the phosphate removal ability of HSMC. The maximum adsorption capacity of HSMC for phosphate was 28.62 mg/g, which is more than 28 times higher than that of CGCS. The HSMC had a high point of zero charge (pHPZC) of 7.5, providing good phosphate removal performance over a wide pH range. The phosphate removal mechanism of HSMC mainly involves ligand exchange induced by the large number of hydroxyl groups, inner-sphere complexation induced by the presence of major metal (hydr)oxides, the precipitation of calcium and aluminum with phosphate groups, and some electrostatic adsorption induced by the positively charged surface. The contribution of precipitation to the phosphate removal ability was approximately 27 %. This study provides a new method for the development of phosphate adsorbents while recycling CGCS. |
| first_indexed | 2024-04-10T19:04:29Z |
| format | Article |
| id | doaj.art-5af7ab94eaf24ce2bfd3d0f2499531f2 |
| institution | Directory Open Access Journal |
| issn | 1878-5352 |
| language | English |
| last_indexed | 2024-04-10T19:04:29Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
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| series | Arabian Journal of Chemistry |
| spelling | doaj.art-5af7ab94eaf24ce2bfd3d0f2499531f22023-01-31T04:08:45ZengElsevierArabian Journal of Chemistry1878-53522023-03-01163104512Novel composite in situ obtained from coal gasification coarse slag and its mechanism of removing phosphateBaoguo Yang0Yilian Li1Fenglan Han2Yadong Bai3Yonghong Zhang4Jinhao Yu5Zhongbiao Fu6Hubei Key Laboratory of Yangtze River Basin Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, NO. 68 Jincheng Street, East Lake High-Tech Development Zone, Wuhan 430078, PR China; Ningxia Institute of Geophysical and Geochemical Survey, Yinchuan 750001, ChinaHubei Key Laboratory of Yangtze River Basin Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, NO. 68 Jincheng Street, East Lake High-Tech Development Zone, Wuhan 430078, PR China; Corresponding authors.School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, China; Corresponding authors.Ningxia Institute of Geophysical and Geochemical Survey, Yinchuan 750001, China; Corresponding authors.Ningxia Institute of Geophysical and Geochemical Survey, Yinchuan 750001, ChinaHubei Key Laboratory of Yangtze River Basin Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, NO. 68 Jincheng Street, East Lake High-Tech Development Zone, Wuhan 430078, PR ChinaHubei Key Laboratory of Yangtze River Basin Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, NO. 68 Jincheng Street, East Lake High-Tech Development Zone, Wuhan 430078, PR ChinaA novel low-cost hematite–silicon mesoporous composite (HSMC) was synthesized in situ from coal gasification coarse slag (CGCS) via acid modification and its potential for phosphate removal from wastewater was studied. Calcium, aluminum and iron in CGCS were activated by hydrochloric acid, and formed crystalline hematite on the quartz and silicates substrates. Compared with traditional methods of preparing hematite, this in-situ preparation method effectively utilized the iron in CGCS instead of requiring added iron salts, which is highly cost-effective. The specific surface area increased from 4 m2/g for CGCS to 67 m2/g for HSMC, greatly enhancing the phosphate removal ability of HSMC. The maximum adsorption capacity of HSMC for phosphate was 28.62 mg/g, which is more than 28 times higher than that of CGCS. The HSMC had a high point of zero charge (pHPZC) of 7.5, providing good phosphate removal performance over a wide pH range. The phosphate removal mechanism of HSMC mainly involves ligand exchange induced by the large number of hydroxyl groups, inner-sphere complexation induced by the presence of major metal (hydr)oxides, the precipitation of calcium and aluminum with phosphate groups, and some electrostatic adsorption induced by the positively charged surface. The contribution of precipitation to the phosphate removal ability was approximately 27 %. This study provides a new method for the development of phosphate adsorbents while recycling CGCS.http://www.sciencedirect.com/science/article/pii/S1878535222008280RecycleSolid wasteWastewaterAdsorptionDesorption |
| spellingShingle | Baoguo Yang Yilian Li Fenglan Han Yadong Bai Yonghong Zhang Jinhao Yu Zhongbiao Fu Novel composite in situ obtained from coal gasification coarse slag and its mechanism of removing phosphate Arabian Journal of Chemistry Recycle Solid waste Wastewater Adsorption Desorption |
| title | Novel composite in situ obtained from coal gasification coarse slag and its mechanism of removing phosphate |
| title_full | Novel composite in situ obtained from coal gasification coarse slag and its mechanism of removing phosphate |
| title_fullStr | Novel composite in situ obtained from coal gasification coarse slag and its mechanism of removing phosphate |
| title_full_unstemmed | Novel composite in situ obtained from coal gasification coarse slag and its mechanism of removing phosphate |
| title_short | Novel composite in situ obtained from coal gasification coarse slag and its mechanism of removing phosphate |
| title_sort | novel composite in situ obtained from coal gasification coarse slag and its mechanism of removing phosphate |
| topic | Recycle Solid waste Wastewater Adsorption Desorption |
| url | http://www.sciencedirect.com/science/article/pii/S1878535222008280 |
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