Facile template-free synthesis of hierarchically porous NiO hollow architectures with high-efficiency adsorptive removal of Congo red
Journal article
Hu, Hanmei, Deng, Chonghai, Sun, Mei, Zhang, Kehua, Wang, Man, Xu, Jiayi and Le, Huirong 2019. Facile template-free synthesis of hierarchically porous NiO hollow architectures with high-efficiency adsorptive removal of Congo red. Journal of Porous Materials. https://doi.org/10.1007/s10934-019-00758-2
| Authors | Hu, Hanmei, Deng, Chonghai, Sun, Mei, Zhang, Kehua, Wang, Man, Xu, Jiayi and Le, Huirong |
|---|---|
| Abstract | Hierarchically porous NiO hollow architectures (HPHAs) were synthesized via a one-pot facile chemical bath deposition method and followed by a calcination process. The crystal structure, component and morphology of the products were characterized by various techniques. The results revealed that hierarchical architectures with hollow interior are composed of mesoporous NiO nanoflakes with thickness of about 8 nm. Interestingly, the as-synthesized NiO HPHAs have the unusual three-ordered porous features including a microscale hollow interior and two mesoscale pores which are attributed to the holes on the surface of nanoflakes with an average diameter of about 3.9 nm and the cavities on the wall of microsphere in the range of 20–40 nm in diameter formed by interconnecting nanoflakes. These comprehensive hierarchically porous structures are beneficial for the adsorption performance towards Congo red in water. The absorptive capacity over NiO HPHAs achieved about 1.8 and 4.0 times as high as that of the precursor β-Ni(OH)2 hollow microspheres (HSs) and the commercial activity carbon (AC) under the same conditions. The studies of adsorption kinetics illustrated that the adsorption behavior perfectly obeyed the pseudo-second-order model and the adsorption isotherm fits the Langmuir adsorption assumption well. The maximum adsorption capacities were calculated to be 490.2 mg g−1 according to the Langmuir equation, which is excellent result compared to NiO absorbents. The high-efficiency adsorption capacities for NiO HPHAs are attributed to the large specific surface area, the synergistic effect of micro-mesoporous structure and the electrostatic interaction of NiO with CR molecules. Additionally, NiO HPHAs can be easily renewed and has good chemical stability, indicating a great promising absorbent in the application for the removal of diazo organics in wastewater. |
| Keywords | Mechanical Engineering; Mechanics of Materials; Anhui Jianzhu University |
| Year | 2019 |
| Journal | Journal of Porous Materials |
| Publisher | Springer |
| ISSN | 13802224 |
| 15734854 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1007/s10934-019-00758-2 |
| Web address (URL) | http://hdl.handle.net/10545/624193 |
| http://creativecommons.org/licenses/by-nc-nd/3.0/us/ | |
| hdl:10545/624193 | |
| Publication dates | 05 Jun 2019 |
| Publication process dates | |
| Deposited | 07 Oct 2019, 14:02 |
| Accepted | 05 Jun 2019 |
| Rights | Attribution-NonCommercial-NoDerivs 3.0 United States |
| Contributors | Hefei University and University of Derby |
| File | File Access Level Open |
| File | File Access Level Open |
| File |
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