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- Title
Double-Shelled NiCo-LDH@MSiO<sub>3</sub>(M = Ni, Cu, Mn) Hollow Polyhedral Cages for Efficient Adsorption Toward Anionic Organic Pollutant.
- Authors
Li, Shang-Bo; Liu, Ling; Zhang, Yu-Jie; Xia, Zhi-Qiang; Wang, Ning; Wang, Quan-De
- Abstract
Hierarchical hollow nano-/micro-architectures with complex multishelled structures are highly desirable for achievement of various functionalities. However, it is still a great challenge to integrate multinary compositions into a nonspherical hollow structure with complex multishells. Herein, we developed an effective strategy to construct hierarchical double-shelled NiCo-layered double hydroxides@MSiO3 (NiCo-LDH@MSiO3, M = Ni, Cu, Mn) hollow polyhedral nanocages with inner NiCo-LDH and outer MSiO3 layers. Our design principle involved a one-pot synthesis of Co-based zeolitic imidazolate framework-67@SiO2 (ZIF-67@SiO 2) core@shell polyhedrons and a subsequent two-step in situ chemical conversion reaction process. Benefiting from the structural merits including high specific surface area, abundant mass diffusion pathways, and the unique hierarchical hollow structures, the double-shelled NiCo-LDH@MSiO3 hollow polyhedral cages exhibited significant adsorption capacity of Congo red. Especially, the maximum adsorption capacity of the double-shelled NiCo-LDH@NiSiO3 hollow polyhedral cages could reach up to 510.6 mg/g, implying a high efficiency for the removal of Congo red from aqueous solution and a potential application in water treatment. Double-shelled NiCo-LDH@MSiO3 (M = Ni, Cu, Mn) hollow polyhedral cages have been fabricated by using ZIF-67@SiO2 core@shell polyhedrons as the temple. The chemical conversion process involves the chemical reaction of ZIF-67 core with Ni2+ in a refluxing process and the hydrothermal reaction of SiO2 shell with M2+ in NH3-NH4Cl buffer system. Benefiting from the structural merits, the double-shelled NiCo-LDH@MSiO3 hollow polyhedral cages exhibit significant adsorption capacity of Congo red, which is much higher or comparable to the absorbents mostly reported.
- Subjects
ADSORPTION capacity; CHEMICAL processes; CONGO red (Staining dye); POLLUTANTS; WATER purification; ADSORPTION (Chemistry)
- Publication
NANO, 2022, Vol 17, Issue 3, p1
- ISSN
1793-2920
- Publication type
Article
- DOI
10.1142/S1793292022500199