AICHE JOURNAL
·
2022
·Vol. 69
·期 4
·e17933
·
IF 4.167
Wei Xie,Yiping Guo,Jianping Li,Honglai Liu,Jun Hu
Metal organic frameworks (MOFs) have shown promising adsorptive desulfurization (ADS) capacity yet remains great challenges to maintain excellent performance in presence of water. Guided by the density function theoretical (DFT) calculations, we select bromine modified linkers with different substitution degrees to construct MIL-47-xBr to regulate the porosity and hydrophobicity. The optimized MIL-47-Br exhibits the highest saturation dibenzothiophene (DBT) capacity of 179.2 mgS g −1 from the hydrous oil, surpassing the record of all ADS adsorbents. Meanwhile, the excellent selectivity, adsorption kinetics, and recycle stability endow MIL-47-Br with superior ADS performance from the commercial hydrous gasoline. With the DBT capacity decreases by only 12.3% from the commercial gasoline, a continue flow ADS is successfully achieved on the fixed-bed of MIL-47-Br column. Therefore, this facial strategy of simple substitution can fully exploit the functions of open metal sites for enhancing the task-specific selectivity, and has a promising application prospect in industrial ADS.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 48
·18473-18479
·
IF 4.569
Yan Zhou,Shanshan Lv,Han Li,Qikang Wu,Taiyu Chen,Shaohuan Liu,Wanying Li,Wenjuan Yang,Zheng Chen
The development and transformation of biomass-derived platform compounds is a sustainable way to deal with the fossil fuel crisis. 5-Hydroxymethylfurfural (HMF) can be reduced or oxidized to produce many high-value compounds; however, it is challenging to effectively produce 2,5-diformylfuran (DFF) due to overoxidation. In this work, a carbon-doped V2O5 (C–V2O5) material was obtained through pyrolysis of MIL-47(V) nanorods, a typical metal–organic framework material. The X-ray diffraction patterns and X-ray photoelectron spectra showed that the graphitized carbon species were incorporated in C–V2O5. High-efficiency HMF oxidation, high specific selectivity for DFF and excellent recycling could be achieved with the C–V2O5 catalyst. Fourier-transform infrared spectroscopy combined with density functional theory (DFT) calculation revealed that graphitized carbon weakens the VO bond and promotes the formation of oxygen vacancies in C–V2O5, thus improving the catalytic activity in the oxidation of furfuryl alcohols. The V4+ induced by oxygen vacancies will be oxidized by O2 to form V5+, so that the cycle can be realized. It exhibits remarkable selectivity in the oxidation of different alcohols produced from biomass based on the relatively constant active sites in C–V2O5.
研究领域:
材料科学
·
催化
·
化学工程
·
可持续化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 7
·4552-4561
·
IF 6.895
Jing Yang,Bo Wang,Fan Jin,Yu Ning,Hao Luo,Jian Zhang,Fei Wang,Dianlong Wang,Yu Zhou
Lithium–sulfur batteries are promising candidates for the next generation of energy storage systems owing to their high energy density, low toxicity and abundant reserves of sulfur. However, sulfur has poor conductivity, large volume change during charge/discharge, and more importantly, the intermediate polysulfide (Li2Sn, 3 ≤ n≤8) produced in the cycling process is easily soluble in the electrolyte resulting in the “shuttle effect”, which have greatly limited the commercialization of lithium–sulfur batteries. Therefore, it is of great value to develop optimized sulfur cathode materials to improve electrode conductivity, buffer volume change and restrain the diffusion of polysulfide. In this work, we construct a V-MOF (MIL-47) derived V2O3@C hollow microcuboid with a hierarchical lasagna-like structure through hydrothermal synthesis followed by calcination, and employ it as a sulfur host for the first time. The fast anchoring of polysulfide by V2O3 nanoparticles and the high electronic conductivity of the 3D carbon framework can simultaneously inhibit the “shuttle effect” in the charge–discharge process and accelerate the kinetics of the redox process. Moreover, the special lasagna-like structure with appropriate voids generated during calcination not only provides many sites for sulfur loading, but also effectively alleviates the volume expansion problem during the electrochemical reaction. Therefore, the final fabricated sulfur cathode via the melt impregnation method exhibits good cycling stability (62.3% after 1000 cycles at 1C) and rate performance (663 mA h g−1 at 2C) at a relatively high sulfur loading of 3.7 mg cm−2.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Advanced Healthcare Materials
·
2023
·
IF 10
Bijun Zhu,Jiangjiexing Wu,Tong Li,Songtao Liu,Junheng Guo,Yijun Yu,Xinyi Qiu,Yue Zhao,Haoran Peng,Jinli Zhang,Leiying Miao,Hui Wei
The use of oxidoreductase nanozymes to regulate reactive oxygen species (ROS) has gradually emerged in periodontology treatments. However, current nanozymes for treating periodontitis eliminate ROS extensively and non-specifically, ignoring the physiological functions of ROS under normal conditions, which may result in uncontrolled side effects. Herein, using the MIL-47(V)-F (MVF) nanozyme, which mimics the function of glutathione peroxidase (GPx), we propose that ROS can be properly regulated by specifically eliminating H 2 O 2 , the most prominent ROS. Through H 2 O 2 elimination, MVF contributes to limiting inflammation, regulating immune microenvironment, and promoting periodontal regeneration. Moreover, MVF stimulates osteogenic differentiation of periodontal stem cells directly, further promoting regeneration due to the vanadium in MVF. Mechanistically, MVF regulates ROS by activating the Nrf2/HO-1 pathway and promotes osteogenic differentiation directly through the PI3K/Akt pathway. We present a promising periodontitis therapy strategy using GPx-mimicking nanozymes through their triple effects of antioxidation, immunomodulation, and bone remodeling regulation, making nanozymes an excellent tool for developing precision medicine. This article is protected by copyright. All rights reserved
研究领域:
牙科学
·
纳米技术
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再生医学
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免疫学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）