JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Senda Su,Xiaoman Li,Xu Zhang,Jingting Zhu,Guodong Liu,Mengyao Tan,Yingying Wang,Min Luo
The incorporation of polyoxometalates (POMs) in metal-organic frameworks (MOFs) with host-guest structure have proven to be effective strategy to rational design of heterogeneous catalysis. In this study, the Keggin-type POM@MIL-101(Cr) composite catalysts (PMo 12 , PW 12 and SiW 12 ) are synthesized for nitrogen fixation reaction without sacrificial agents at room temperature in the first time. The SiW 12 molecules are encapsulated in smaller cavities of MIL-101(Cr) by solvothermal method and in larger cavities by impregnation method, respectively. Solvothermal synthesized catalyst has a performance of 75.56 μmol·h −1 ·g -1 cat and TOF value of 1.95 h −1 , which are about 10 and 88 times than that of Na 4 SiW 12 O 40 . The excellent performance is ascribed to the synergistic effect of SiW 12 and MIL-101(Cr). The MIL-101(Cr) adsorbs a large amount of N 2 and generates sufficiently photogenerated electrons under sunlight irradiation, and electrons quickly transfer to the SiW 12 through hydrogen bonds. Moreover, the agglomeration effect of the homogeneous catalyst SiW 12 is weakened due to encapsulation with more exposed active sites. This work provides a feasible route to design and synthesize nanocomposite materials with exceptional performance for photocatalytic nitrogen fixation.
研究领域:
材料科学
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环境科学
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化学
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DOI
PubMed
高影响因子
ANALYST
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2019
·Vol. 144
·期 18
·5455-5461
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IF 4.019
Wei Shi,Shuang E,Meng-Meng Wang,Tian-Ze Li,Ting Yang,Shao-Rong Liu,Ming-Li Chen,Jian-Hua Wang
Over the past few years, artificial enzymes have attracted enormous attention due to their high stabilities and cost-effective productions. In this work, metal–organic framework-derived SiW12@Co3O4 was synthesized in large quantities by stirring the mixture at ambient temperature and calcination. The obtained SiW12@Co3O4 exhibited a highly inherent peroxidase-like activity and excellent stability. Kinetic studies demonstrated that the synthesized SiW12@Co3O4 had a strong binding affinity to 3,3′,5,5′-tetramethylbenzidine (TMB), stronger than HRP had. Specifically, the peroxidase-like activity of SiW12@Co3O4 in an aqueous solution was well maintained after incubation at an elevated temperature, at an extreme pH and for a long time. A SiW12@Co3O4-based method was further developed for H2O2 and one-pot glucose detection with good sensitivity and reliability. The facile synthesis approach is expected to facilitate the practical use of metal–organic frameworks and their derivatives as enzyme mimics in the future.
研究领域:
生物化学
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材料科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Haichuan Zhang,Zede Yi,Shiyu Fu,Changzhi Li,Lucian A. Lucia,Qiying Liu
A rational design of the intrinsic lattice structure of catalysts is vitally important to address catalytic performance. Herein is reported a top-down synthesis for the fabrication of a bifunctional metallic catalyst. First, palladium nanocubes with (100) lattices planes were synthesized through a shape-control strategy; next, the as-synthesized Pd/Co-ZIF was used as a template for in - situ phase reconstruction by a spontaneous phase transformation process in the presence of H 4 SiW under solvothermal conditions. Ultimately, formation of 3D hierarchical flower-like bimetallic nitride nanosheets (SiW 12 @Pd/Co-ZIF-NS) were generated because of this process. The SiW 12 @Pd/Co-ZIF-NS catalyst not only displays excellent catalytic transfer hydrogenolysis for C-O bond cleavage of lignin dimeric substrates, but also maintains superior recycling durability due to an encapsulation phenomenon preventing aggregation. Finally, the resulting nanocomposites exhibit superior activity and good size selectivity toward catalytic transfer hydrogenolysis of the actual lignin substrates to produce a significant amount of low-molecular-weight aromatic compounds .
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
高影响因子
Frontiers in Bioengineering and Biotechnology
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2023
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IF 5.7
Cheng Yao,Sun Chaoyue,Chang Yuhua,Wu Jiayin,Zhang Zhihao,Liu Yunqing,Ge Shenguang,Li Zhao,Li Xiao,Sun Liang,Zang Dejin
A highly sensitive biosensor for detecting HPV 16 DNA was prepared based on Keggin-type polyoxometalate (SiW12)-grafted CdS quantum dots (SiW12@CdS QDs) and colloidal gold nanoparticles (Au NPs), which exhibited remarkable selectivity and sensitivity upon target DNA detection because of its excellent photoelectrochemical (PEC) response. Here, an enhanced photoelectronic response ability was achieved with the strong association of SiW12@CdS QDs by polyoxometalate modification, which was developed through a convenient hydrothermal process. Furthermore, on Au NP-modified indium tin oxide slides, a multiple-site tripodal DNA walker sensing platform coupled with T7 exonuclease was successfully fabricated with SiW12@CdS QDs/NP DNA as a probe for detecting HPV 16 DNA. Due to the remarkable conductivity of Au NPs, the photosensitivity of the as-prepared biosensor was improved in an I3−/I− solution and avoided the use of other regents toxic to living organisms. Finally, under optimized conditions, the as-prepared biosensor protocol demonstrated wide linear ranges (15–130 nM), with a limit of detection of 0.8 nM and high selectivity, stability, and reproducibility. Moreover, the proposed PEC biosensor platform offers a reliable pathway for detecting other biological molecules with nano-functional materials.
研究领域:
生物医学
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纳米技术
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分子诊断
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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）