期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 269, 期 -, 页码 507-512出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2018.10.027
关键词
Structured ZIF-8; Powder scale-up; Enhance CO2 uptake; Hierarchical porous materials; Post-thermal treatment
资金
- National Natural Science Foundation of China [21501018]
- Jilin Province Department of Education 13th Five-Year Science and Technology Project [JJKH20181005KJ]
- Open project of State Key Laboratory of Inorganic Synthesis and Preparative Chemistry [2018-29]
This work demonstrated the design and synthesis of millimetre-scale hierarchical porous spheres based on ZIF-8 and CS (chitosan) by in situ assembly and post-thermal treatment technology. The ZIF-8/CS spheres have been synthesized according to the assembly method, which exhibited honeycomb internal structures and micropores of 0.77 nm. While the annealed ZIF-8/CS spheres exhibited obvious mesopores with a BET surface area of 626.85 m(2) g(-1) and maintained the honeycomb internal structures, which were obtained by calcinations in the tube furnace under nitrogen protection at 500 degrees C for four hours. The annealed ZIF-8/CS spheres exhibited hierarchical porous with macropores, micropores and mesopores after annealing process. The SEM image and the XRD pattern of annealed ZIF-8/CS spheres suggested the maintenance of shape and crystal structure of ZIF-8, indicated that the annealed ZIF-8/CS spheres were stable and robust. Particularly, the CO2 uptake of annealed ZIF-8/CS spheres with 500 degrees C is 0.99 mmol/g, which obvious higher than that of as synthesized ZIF-8/CS spheres and samples annealed at 450 degrees C, 525 C and 550 degrees C. The enhancement of CO2 uptake may attribute to the carbonization of CS and the enlarge micropores of ZIF-8 after annealing process. This approach could induce a simple way for industrial structuring ZIF-8-based adsorbents with improved CO2 uptake.
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