ACS Applied Energy Materials
·
2021
·
IF 6.024
Mengde Li,Junjie Liu,Shuping Deng,Qian Liu,Ning Qi,Zhiquan Chen
In this paper, three kinds of zeolite imidazole frameworks (ZIF-90, ZIF-93, and ZIF-94) were synthesized through hydrothermal reactions. Positron lifetime results reveal two kinds of pores corresponding to the channel in the windows and central cavity of ZIFs. The average diameters of the cavities are 1.12, 1.54, and 0.80 nm in ZIF-90, ZIF-93, and ZIF-94, respectively, while the average diameters of channels are between 0.55 and 0.60 nm. CO2 adsorption results show that ZIF-90 has the highest CO2 adsorption capacities (64.4 cm3 g–1 at 298 K and 104.7 cm3 g–1 at 273 K) at 1 bar, followed by ZIF-94 (57.9 cm3 g–1 at 298 K and 79.4 cm3 g–1 at 273 K) and ZIF-93 (41.5 cm3 g–1 at 298 K and 62.5 cm3 g–1 at 273 K). This shows inconsistency with the total pore volume but is in good agreement with relative volumes of pores smaller than 1.2 nm, which are 6.55, 2.06, and 5.60% for ZIF-90, ZIF-93, and ZIF-94, respectively. Further investigation reveals that an even smaller pore size is required for CO2 adsorption under ultralow pressure. At a pressure of 0.1 bar, ZIF-94 exhibits an ultrahigh CO2 adsorption capacity (21.2 cm3 g–1 at 298 K and 32.1 cm3 g–1 at 273 K) compared with ZIF-93 (10.1 cm3 g–1 at 298 K and 14.9 cm3 g–1 at 273 K) and ZIF-90 (5.9 cm3 g–1 at 298 K and 11.6 cm3 g–1 at 273 K). These quantities coincide well with the relative volumes of pores smaller than 0.8 nm, which are 5.60, 2.06, and 1.18% for ZIF-94, ZIF-93, and ZIF-90, respectively. Our results demonstrate that at atmospheric pressure, CO2 molecules are more effectively captured by micropores, while at extremely low pressures, CO2 molecules are mainly enriched around ultramicropores such as the channels and small cavities in ZIFs.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 20
·12702-12709
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IF 4.036
Yi Lu,Haibo Pan,Jiafeng Lai,Yuzhou Xia,Lu Chen,Ruowen Liang,Guiyang Yan,Renkung Huang
Effective design of photocatalysts is an effective method to improve the separation of photogenerated carriers, which improves the photocatalytic performance of photocatalysts. In this work, CoCu-ZIF materials with bimetallic structure were synthesized at room temperature for efficient photocatalytic fuel denitrification. The properties and structures of CoCu-ZIF photocatalysts can be effectively controlled by adjusting the molar ratio of cobalt to copper. The as-prepared CoCu-ZIF photocatalysts were characterized by XRD, FT-IR, SEM, TEM, UV-vis, Raman, BET and other techniques. The photoactivity of CoCu-ZIF for the denitrogenation of NCCs has been evaluated using visible light (λ ≥ 420 nm). The results indicate that Co8Cu2-ZIF photocatalysts exhibit excellent photocatalytic properties, in which the denitrification rate almost reached 80% after 4 hours under visible light irradiation, which is higher than the degradation ability of ZIF-67 (38%). Transient photoelectrochemical experiments and EIS Nyquist plots indicate that Co8Cu2-ZIF with unique structure efficiently improves the separation and transfer of photogenerated electron–hole pairs. Moreover, a possible reaction mechanism was proposed by LC-MS analysis.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Jiaji Yue,Siying Zhou,Xingxiang Ji,Chunqi Jiao,Yi Cheng,Yehan Tao,Jie Lu,Jian Du,Haisong Wang
Robust biopolymer-based composite film with multifunctional performances significantly contributes to the packaging field. Herein, we proposed a sort of carboxymethyl cellulose (CMC) based composite film via incorporating versatile zeolitic imidazolate framework (ZIF) materials. Compared to pristine CMC film, the OTR, WVTR, and tensile strength of CMC/ZIF composite film with 1 wt ‰ Zn/Co-ZIF were improved from 64.89 cm 3 *μm/(m 2 *d*kPa), 1579.21 g/(m 2 *24h) and 16.9 MPa to 20.79 cm 3 *μm/(m 2 *d*kPa), 1209.58 g/(m 2 *24h) and 70.1 MPa, respectively. Notably, owing to the reduced band gap and intrinsic chemical and thermal stability of Zn/Co-ZIF, the fabricated Zn/Co-ZIF/CMC composite film presented well UV protection capability within the whole UV region and excellent UV-blocking durability after being exposed to UV-light at 365 nm for 12 h. In practice, the photocatalytic degradation of RhB solutions under UV light could be effectively suppressed when using Zn/Co-ZIF/CMC film as UV protection layer. Our findings proposed the potential application of these versatile ZIF materials as functional nanofiller within biopolymer substances for UV protection and transparent packaging area.
研究领域:
材料科学
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包装工程
·
生物聚合物
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）