Effect of sulfuric acid concentration on morphology of calcium sulfate hemihydrate crystals
Calcium sulfate hemihydrate whiskers were prepared in sulfuric acid-distilled water system by hydrothermal method using calcium sulfate dihydrate as raw materials. The influence mechanism of sulfuric acid concentration on morphology of calcium sulfate hemihydrate crystals was investigated. The resul...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/abbc41 |
| _version_ | 1797746892234293248 |
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| author | Yubin Wang Xinyu Mao Chang Chen Wangbo Wang Weiben Dang |
| author_facet | Yubin Wang Xinyu Mao Chang Chen Wangbo Wang Weiben Dang |
| author_sort | Yubin Wang |
| collection | DOAJ |
| description | Calcium sulfate hemihydrate whiskers were prepared in sulfuric acid-distilled water system by hydrothermal method using calcium sulfate dihydrate as raw materials. The influence mechanism of sulfuric acid concentration on morphology of calcium sulfate hemihydrate crystals was investigated. The results show that the morphology of hydrothermal products is fibrous when the suitable sulfuric acid concentration is from 5.0 × 10 ^−6 mol l ^−1 to 5.0 × 10 ^−4 mol l ^−1 . The promoting effect of sulfuric acid on the dissolution of calcium sulfate dihydrate increases the amount of Ca ^2+ in the solution, which is beneficial to the crystallization of calcium sulfate hemihydrate crystals. Meanwhile, the selective adsorption of H ^+ produced by sulfuric acid ionization on the (310) crystal plane of calcium sulfate hemihydrate crystals can hinder the aggregation of Ca ^2+ on the crystal plane, which results in preferential growth of the calcium sulfate hemihydrate crystal along the (001) crystal plane. However, when the sulfuric acid concentration is up to 5.0 × 10 ^−3 mol l ^−1 , the ${{{\rm{HSO}}}_{4}}^{-}$ produced by the interaction of H ^+ with ${{{\rm{SO}}}_{4}}^{2-}$ can reduce the electronegativity of ${{{\rm{SO}}}_{4}}^{2-}$ and inhibit ${{{\rm{SO}}}_{4}}^{2-}$ adsorption on the crystal surface. So the growth of calcium sulfate hemihydrate crystals along (001) crystal plane is hindered, which leads to the decrease of the fibrous products. |
| first_indexed | 2024-03-12T15:44:12Z |
| format | Article |
| id | doaj.art-8e437c01831c4da1b3a5e83c377e8fee |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:44:12Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-8e437c01831c4da1b3a5e83c377e8fee2023-08-09T15:50:39ZengIOP PublishingMaterials Research Express2053-15912020-01-0171010550110.1088/2053-1591/abbc41Effect of sulfuric acid concentration on morphology of calcium sulfate hemihydrate crystalsYubin Wang0Xinyu Mao1Chang Chen2https://orcid.org/0000-0002-1132-9448Wangbo Wang3Weiben Dang4School of Resource Engineering, Xi’an University of Architecture & Technology , Xi’an 710055, Shaanxi, People’s Republic of ChinaSchool of Resource Engineering, Xi’an University of Architecture & Technology , Xi’an 710055, Shaanxi, People’s Republic of ChinaSchool of Materials Science and Engineering, Xi’an University of Architecture & Technology , Xi’an 710055, Shaanxi, People’s Republic of ChinaSchool of Resource Engineering, Xi’an University of Architecture & Technology , Xi’an 710055, Shaanxi, People’s Republic of ChinaSchool of Resource Engineering, Xi’an University of Architecture & Technology , Xi’an 710055, Shaanxi, People’s Republic of ChinaCalcium sulfate hemihydrate whiskers were prepared in sulfuric acid-distilled water system by hydrothermal method using calcium sulfate dihydrate as raw materials. The influence mechanism of sulfuric acid concentration on morphology of calcium sulfate hemihydrate crystals was investigated. The results show that the morphology of hydrothermal products is fibrous when the suitable sulfuric acid concentration is from 5.0 × 10 ^−6 mol l ^−1 to 5.0 × 10 ^−4 mol l ^−1 . The promoting effect of sulfuric acid on the dissolution of calcium sulfate dihydrate increases the amount of Ca ^2+ in the solution, which is beneficial to the crystallization of calcium sulfate hemihydrate crystals. Meanwhile, the selective adsorption of H ^+ produced by sulfuric acid ionization on the (310) crystal plane of calcium sulfate hemihydrate crystals can hinder the aggregation of Ca ^2+ on the crystal plane, which results in preferential growth of the calcium sulfate hemihydrate crystal along the (001) crystal plane. However, when the sulfuric acid concentration is up to 5.0 × 10 ^−3 mol l ^−1 , the ${{{\rm{HSO}}}_{4}}^{-}$ produced by the interaction of H ^+ with ${{{\rm{SO}}}_{4}}^{2-}$ can reduce the electronegativity of ${{{\rm{SO}}}_{4}}^{2-}$ and inhibit ${{{\rm{SO}}}_{4}}^{2-}$ adsorption on the crystal surface. So the growth of calcium sulfate hemihydrate crystals along (001) crystal plane is hindered, which leads to the decrease of the fibrous products.https://doi.org/10.1088/2053-1591/abbc41calcium sulfate hemihydratesulfuric acidconcentrationsolubilitymorphology |
| spellingShingle | Yubin Wang Xinyu Mao Chang Chen Wangbo Wang Weiben Dang Effect of sulfuric acid concentration on morphology of calcium sulfate hemihydrate crystals Materials Research Express calcium sulfate hemihydrate sulfuric acid concentration solubility morphology |
| title | Effect of sulfuric acid concentration on morphology of calcium sulfate hemihydrate crystals |
| title_full | Effect of sulfuric acid concentration on morphology of calcium sulfate hemihydrate crystals |
| title_fullStr | Effect of sulfuric acid concentration on morphology of calcium sulfate hemihydrate crystals |
| title_full_unstemmed | Effect of sulfuric acid concentration on morphology of calcium sulfate hemihydrate crystals |
| title_short | Effect of sulfuric acid concentration on morphology of calcium sulfate hemihydrate crystals |
| title_sort | effect of sulfuric acid concentration on morphology of calcium sulfate hemihydrate crystals |
| topic | calcium sulfate hemihydrate sulfuric acid concentration solubility morphology |
| url | https://doi.org/10.1088/2053-1591/abbc41 |
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