Nanomaterials
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2018
·Vol. 8
·期 10
·781
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IF 3.504
Xinli Yang,Nan Wu,Yongxia Miao,Haobo Li
Tungsten oxide (WO3) and boron oxide (B2O3) were irreversibly encapsulated into the nanocages of the Zr-based metal organic framework UiO-66, affording a hybrid material B2O3-WO3/UiO-66 by a simple microwave-assisted deposition method. The novel B2O3-WO3/UiO-66 material was systematically characterized by X-ray diffraction, Fourier transform infrared spectroscopy, N2adsorption, ultraviolet–visible diffuse reflectance spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray phosphorescence, and Fourier transform infrared (FTIR)-CO adsorption methods. It was found that WO3and B2O3were highly dispersed in the nanocages of UiO-66, and the morphology and crystal structure of UiO-66 were well preserved. The B2O3species are wrapped by WO3species, thus increasing the polymeric degree of the WO3species, which are mainly located in low-condensed oligomeric environments. Moreover, when compared with WO3/UiO-66, the B2O3-WO3/UiO-66 material has a little weaker acidity, which decreased by 10% upon the B2O3introduction. The as-obtained novel material exhibits higher catalytic performance in the cyclopentene selective oxidation to glutaraldehyde than WO3/UiO-66. The high catalytic performance was attributed to a proper amount of B2O3and WO3with an appropriate acidity, their high dispersion, and the synergistic effects between them. In addition, these oxide species hardly leached in the reaction solution, endowing the catalyst with a good stability. The catalyst could be used for six reaction cycles without an obvious loss of catalytic activity.Keywords:UiO-66;WO3;B2O3;metal organic frameworks;cyclopentene;glutaraldehyde
研究领域:
材料科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
Nano Energy
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2023
·
IF 17.6
Penghao Zhu,Zaka Ullah,Surong Zheng,Zairui Yang,Shiwei Yu,Shoupu Zhu,Liwei Liu,Aihua He,Cunguo Wang,Qi Li
Metals are the basic and key components of most of the stuff present all around us in our living environment. The corrosion of these metals is a natural phenomenon which can be avoided through application of electrochemical cathodic protection . The triboelectric nanogenerator (TENG) is used to convert the environmental energy into electric energy. Unfortunately, the current output of TENG is always lower which limits its applications in protection of metal corrosion. In this work, we report the fabrication of efficient TENG based on UIO-66, UIO-66-NO 2 and UIO-66-NH 2 , and use it as a power supply to construct a self-powered anticorrosion system for cathodic protection on carbon steel . The introduction of nitrate (-NO 2 ) and amine (-NH 2 ) groups change the Fermi level of the material, allowing the TENG to transfer more electrons during the contact. It is observed that the performance of TENG based on UIO materials is fruitful, with a maximum short-circuit current as 50.0 μA and a maximum power as 122.5 μW·cm −2 . In addition, dipping experiments and electrochemical measurements showed that the TENG is capable to offer notable cathodic protection to carbon steel. The demonstrated work introduces an efficient and cost-effective strategy for scavenging the mechanical energy from environment by employing the self-powered setup to effectually protect the metals from corrosion. The assembly of auspicious self-powered cathodic protection setup based on TENG offers a great potential for versatile applications in protection of metallic corrosion activities.
研究领域:
材料科学
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能源技术
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腐蚀与防护
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2024
·
IF 4
Senwei Jiang,Hangzhen Lan,Zhen Wu,Daodong Pan,Yichun Wu
This study focuses on the synthesis, characterization, and adsorption performance of a series of UiO-66-based materials for the adsorption of alkylphenols such as bisphenol A (BPA), 4-butylphenol (4-BP), and 4-pentylphenol (PP). The UiO-66 series, including UiO-66-NH 2 –50 %, mesoporous UiO-66 (HCl‑meso-UiO-66), and 4-pentylbenzoic acid-modified 4‑meso-UiO-66, were prepared through a combination of thermal and chemical modifications. Transmission electron microscopy analyses confirmed the successful creation of mesoporous structures, while FT-IR and XPS spectroscopy validated the chemical modifications. The adsorption performance was evaluated through kinetic and isotherm studies, employing pseudo-first-order and pseudo-second-order models as well as Langmuir and Freundlich isotherm models. The results indicated rapid initial adsorption rates, with equilibrium reached within 40 min. The pseudo-second-order model provided the best fit for the kinetic data, while the Freundlich model better described the adsorption behavior for 4-BP and PP, suggesting multilayer adsorption on heterogeneous sites. Thermodynamic studies indicated that 4-BP adsorption is endothermic and non-spontaneous, while BPA and PP adsorption exhibited exothermic and spontaneous characteristics. The study also explored the adsorption mechanisms, highlighting the importance of hydrophobic interactions and size-exclusion effect in the adsorption process. Hydrogen bonding and π-π stacking, although present, was not the primary determinant. The findings underscore the potential of 4‑meso-UiO-66, which exhibited the highest adsorption capacity, particularly for PP, driven by its enhanced pore accessibility, despite a smaller surface area compared to UiO-66-NH 2 –50 %, and hydrophobicity. This work provides valuable insights into the design of efficient adsorbents for alkylphenols enrichment and separation.
研究领域:
环境科学
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材料化学
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吸附技术
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
Yangkun Sun,Yu Han,Linghao Zhao,Yuanzheng Xiang,Wenjing Xiong,Hongyang Zhang,Min Zhang,Fanghong Ning,Ping Hu
A novel concept of two-dimensional magnetic solid phase extraction microfluidic chip (2D-MSPE-chip) was proposed, in which two or even more different separation mechanisms of solid phase extraction units were designed and constructed on microfluidic chips in series. The synthesized Fe 3 O 4 -UiO-66-C18 was used in the first dimension to retain protein and phospholipid through hydrophobic effect and Zr O P coordination, which could almost eliminate the interference of the matrix effect on the mass spectrum. The second dimensional material utilized Fe 3 O 4 -UiO-66-NH 2 to enable cytarabine enrichment via π–π and hydrogen bonding. The parameters of 2D MSPE-Chip/tandem MS method such as desorption solvent (5 % acetic acid acetonitrile), loading solvent (20 % acetonitrile), and flow rate for extraction and desorption (10 μL/min) were select. The LOD of the established method for cytarabine in plasma was 0.13 ng/mL, and the linear range was between 2.0 ng/mL and 1000 ng/mL with correlation coefficient (R 2 = 0.9991). The matrix effect was −5.0 %. The recovery rate of real samples ranged from 95.5 % to 104.8 %, with RSD ≤ 5.2 %. The chip design was simple and efficient and could be reused, thereby decreasing analysis expenses. It held considerable potential for application in rapid clinical diagnostics and precision medicine.
研究领域:
分析化学
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医学诊断
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药物分析
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）