Morphological Control of Layered Double Hydroxides Prepared by Co-Precipitation Method
Layered double hydroxides (LDHs) can be used in various popular fields due to their good biocompatibility, easy chemical modification, and high theoretical specific capacity. However, for different applications, there are different requirements for the morphology of LDH nanosheets. In this paper, th...
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MDPI AG
2022-11-01
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| Series: | Crystals |
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| author | Changxin Wei Xiaoyun Yan Yi Zhou Wenke Xu Yiqi Gan Yihe Zhang Na Zhang |
| author_facet | Changxin Wei Xiaoyun Yan Yi Zhou Wenke Xu Yiqi Gan Yihe Zhang Na Zhang |
| author_sort | Changxin Wei |
| collection | DOAJ |
| description | Layered double hydroxides (LDHs) can be used in various popular fields due to their good biocompatibility, easy chemical modification, and high theoretical specific capacity. However, for different applications, there are different requirements for the morphology of LDH nanosheets. In this paper, the crystal morphological control and the exfoliation states of LDHs are investigated. The interlayer spacing of LDH decreases with the increase of intercalating ion affinity, exhibiting difficulty in being exfoliated into nanosheets. The calculated binding energies between LDH laminates and intercalated ions CO<sub>3</sub><sup>2−</sup>, Cl<sup>−</sup>, and NO<sub>3</sub><sup>−</sup> are 0.311 eV, 0.301 eV, and 0.071 eV, respectively. LDH-NO<sub>3</sub><sup>−</sup> with complete hexagonal shape and high crystallinity can be prepared under the condition of Co:Al:urea = 3:1:10, 90 °C, and 48 h. In the preparation of LDH-NO<sub>3</sub><sup>−</sup> with high saturation co-precipitation method, formamide acts as an effective layer growth inhibitor. When the formamide content is 50%, the size of formed LDH nanosheets is significantly reduced by 28.1%, and when the formamide content is up to 100%, it is further reduced by 7.0%. The addition of formamide can also inhibit the generation of byproducts. The addition of NaNO<sub>3</sub> leads to a stronger monodispersity of LDH nanosheets. By comparing CoAl-LDH, MgAl-LDH, and ZnAl-LDH, lower standard molar Gibbs free energy results in a larger nanosheet with high saturation co-precipitation method, but the alteration of M<sup>2+</sup> exhibits negligible difference in the size and shape by means of homogeneous co-precipitation. |
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| language | English |
| last_indexed | 2024-03-09T17:10:06Z |
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| series | Crystals |
| spelling | doaj.art-282a0ccfdb8148749f9d622ccf0495a22023-11-24T14:09:41ZengMDPI AGCrystals2073-43522022-11-011212171310.3390/cryst12121713Morphological Control of Layered Double Hydroxides Prepared by Co-Precipitation MethodChangxin Wei0Xiaoyun Yan1Yi Zhou2Wenke Xu3Yiqi Gan4Yihe Zhang5Na Zhang6School of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaGeneral Prospecting Institute of China National Administration of Coal Geology, Beijing 100039, ChinaSchool of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaSchool of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaSchool of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaSchool of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaSchool of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaLayered double hydroxides (LDHs) can be used in various popular fields due to their good biocompatibility, easy chemical modification, and high theoretical specific capacity. However, for different applications, there are different requirements for the morphology of LDH nanosheets. In this paper, the crystal morphological control and the exfoliation states of LDHs are investigated. The interlayer spacing of LDH decreases with the increase of intercalating ion affinity, exhibiting difficulty in being exfoliated into nanosheets. The calculated binding energies between LDH laminates and intercalated ions CO<sub>3</sub><sup>2−</sup>, Cl<sup>−</sup>, and NO<sub>3</sub><sup>−</sup> are 0.311 eV, 0.301 eV, and 0.071 eV, respectively. LDH-NO<sub>3</sub><sup>−</sup> with complete hexagonal shape and high crystallinity can be prepared under the condition of Co:Al:urea = 3:1:10, 90 °C, and 48 h. In the preparation of LDH-NO<sub>3</sub><sup>−</sup> with high saturation co-precipitation method, formamide acts as an effective layer growth inhibitor. When the formamide content is 50%, the size of formed LDH nanosheets is significantly reduced by 28.1%, and when the formamide content is up to 100%, it is further reduced by 7.0%. The addition of formamide can also inhibit the generation of byproducts. The addition of NaNO<sub>3</sub> leads to a stronger monodispersity of LDH nanosheets. By comparing CoAl-LDH, MgAl-LDH, and ZnAl-LDH, lower standard molar Gibbs free energy results in a larger nanosheet with high saturation co-precipitation method, but the alteration of M<sup>2+</sup> exhibits negligible difference in the size and shape by means of homogeneous co-precipitation.https://www.mdpi.com/2073-4352/12/12/1713morphology controllayered double hydroxide (LDH)co-precipitation methodexfoliation of LDH |
| spellingShingle | Changxin Wei Xiaoyun Yan Yi Zhou Wenke Xu Yiqi Gan Yihe Zhang Na Zhang Morphological Control of Layered Double Hydroxides Prepared by Co-Precipitation Method Crystals morphology control layered double hydroxide (LDH) co-precipitation method exfoliation of LDH |
| title | Morphological Control of Layered Double Hydroxides Prepared by Co-Precipitation Method |
| title_full | Morphological Control of Layered Double Hydroxides Prepared by Co-Precipitation Method |
| title_fullStr | Morphological Control of Layered Double Hydroxides Prepared by Co-Precipitation Method |
| title_full_unstemmed | Morphological Control of Layered Double Hydroxides Prepared by Co-Precipitation Method |
| title_short | Morphological Control of Layered Double Hydroxides Prepared by Co-Precipitation Method |
| title_sort | morphological control of layered double hydroxides prepared by co precipitation method |
| topic | morphology control layered double hydroxide (LDH) co-precipitation method exfoliation of LDH |
| url | https://www.mdpi.com/2073-4352/12/12/1713 |
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