Effect of NH4+ on the hydrothermal formation of calcium sulfate hemihydrate whiskers from fluorogypsum
Fluorogypsum (FG), a large amount of solid waste, not only occupies a large amount of land resources, but also causes serious pollution to the surrounding environment. The preparation of calcium sulfate hemihydrate whiskers (CSHW) with high aspect ratio is an effective way to realize the high value-...
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Elsevier
2025-01-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424030187 |
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| author | Jianping Zhu Qilin Wang Zuolin Wang Haixia Liu Huachun Yang Surendra P. Shah Yadong Bian |
| author_facet | Jianping Zhu Qilin Wang Zuolin Wang Haixia Liu Huachun Yang Surendra P. Shah Yadong Bian |
| author_sort | Jianping Zhu |
| collection | DOAJ |
| description | Fluorogypsum (FG), a large amount of solid waste, not only occupies a large amount of land resources, but also causes serious pollution to the surrounding environment. The preparation of calcium sulfate hemihydrate whiskers (CSHW) with high aspect ratio is an effective way to realize the high value-added utilization of FG. However, CSHW prepared by FG has some problems, such as poor crystallization effect and small aspect ratio. Therefore, In this paper, α-CSHW with high aspect ratio was prepared by hydrothermal method with (NH4)2SO4 as additive, and the effect of NH4+ on the microstructure, composition and crystallization behavior of α-CSHW was revealed. The mechanism was studied by XRD, SEM, FTIR, TG-DSC and molecular dynamics simulation. The results showed that the optimum content of (NH4)2SO4 was 0.5 wt%, and the aspect ratio of α-CSHW was 95.83, which was 79.12% higher than that of the blank sample. NH4+ promoted the growth of α-CSHW along the c-axis. With the increase of (NH4)2SO4 content, the promoting effect of calcium sulfate hemihydrate (CSH) crystal growth along the c-axis direction is weakened. NH4+ preferentially adsorbs on the (200) side surface parallel to the c-axis, which inhibits the growth of the crystal in the diameter direction, thereby increasing the average aspect ratio of the whisker. This study provides a new method for the effective utilization of FG and the regulation of α-CSHW. |
| format | Article |
| id | doaj-art-c69af9c1a01a4469aab3004e597a5ca0 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-c69af9c1a01a4469aab3004e597a5ca02025-01-19T06:25:50ZengElsevierJournal of Materials Research and Technology2238-78542025-01-013424432452Effect of NH4+ on the hydrothermal formation of calcium sulfate hemihydrate whiskers from fluorogypsumJianping Zhu0Qilin Wang1Zuolin Wang2Haixia Liu3Huachun Yang4Surendra P. Shah5Yadong Bian6School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, ChinaSchool of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, ChinaSchool of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, ChinaDo-Fluoride New Materials Co., Ltd, Jiaozuo, 454000, ChinaDo-Fluoride New Materials Co., Ltd, Jiaozuo, 454000, ChinaCenter for Advanced Construction Materials, The University of Texas at Arlington, Arlington, TX, 76019, United StatesSchool of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, China; Corresponding author.Fluorogypsum (FG), a large amount of solid waste, not only occupies a large amount of land resources, but also causes serious pollution to the surrounding environment. The preparation of calcium sulfate hemihydrate whiskers (CSHW) with high aspect ratio is an effective way to realize the high value-added utilization of FG. However, CSHW prepared by FG has some problems, such as poor crystallization effect and small aspect ratio. Therefore, In this paper, α-CSHW with high aspect ratio was prepared by hydrothermal method with (NH4)2SO4 as additive, and the effect of NH4+ on the microstructure, composition and crystallization behavior of α-CSHW was revealed. The mechanism was studied by XRD, SEM, FTIR, TG-DSC and molecular dynamics simulation. The results showed that the optimum content of (NH4)2SO4 was 0.5 wt%, and the aspect ratio of α-CSHW was 95.83, which was 79.12% higher than that of the blank sample. NH4+ promoted the growth of α-CSHW along the c-axis. With the increase of (NH4)2SO4 content, the promoting effect of calcium sulfate hemihydrate (CSH) crystal growth along the c-axis direction is weakened. NH4+ preferentially adsorbs on the (200) side surface parallel to the c-axis, which inhibits the growth of the crystal in the diameter direction, thereby increasing the average aspect ratio of the whisker. This study provides a new method for the effective utilization of FG and the regulation of α-CSHW.http://www.sciencedirect.com/science/article/pii/S2238785424030187FluorogypsumCalcium sulfate hemihydrate whiskersNH4+Molecular dynamics simulationInteraction energy |
| spellingShingle | Jianping Zhu Qilin Wang Zuolin Wang Haixia Liu Huachun Yang Surendra P. Shah Yadong Bian Effect of NH4+ on the hydrothermal formation of calcium sulfate hemihydrate whiskers from fluorogypsum Journal of Materials Research and Technology Fluorogypsum Calcium sulfate hemihydrate whiskers NH4+ Molecular dynamics simulation Interaction energy |
| title | Effect of NH4+ on the hydrothermal formation of calcium sulfate hemihydrate whiskers from fluorogypsum |
| title_full | Effect of NH4+ on the hydrothermal formation of calcium sulfate hemihydrate whiskers from fluorogypsum |
| title_fullStr | Effect of NH4+ on the hydrothermal formation of calcium sulfate hemihydrate whiskers from fluorogypsum |
| title_full_unstemmed | Effect of NH4+ on the hydrothermal formation of calcium sulfate hemihydrate whiskers from fluorogypsum |
| title_short | Effect of NH4+ on the hydrothermal formation of calcium sulfate hemihydrate whiskers from fluorogypsum |
| title_sort | effect of nh4 on the hydrothermal formation of calcium sulfate hemihydrate whiskers from fluorogypsum |
| topic | Fluorogypsum Calcium sulfate hemihydrate whiskers NH4+ Molecular dynamics simulation Interaction energy |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424030187 |
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