SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xiulan Weng,Huijing Ma,Gary Owens,Zuliang Chen
Recently, bimetallic Fe-Pd nanoparticles were integrated with metal organic frameworks (MOFs) to produce a new composite catalyst with significant potential for organic contaminant removal due to enhanced adsorption and reduction. Here, 85.9 % of 2,4-dichlorophenol (2,4-DCP) was successfully removed from aqueous solution within 120 min when using a zinc-based zeolitic imidazolate framework (ZIF-8) embedded with Fe-Pd (Fe-Pd@ZIF-8). In comparison only 77.4 and 48.3 % was removed when using ZIF-8 or Fe-Pd alone. Thus, to better understand the function of composite components (ZIF-8 and Fe-Pd) in the removal of 2,4-DCP, and the specific removal mechanism involved, Fe-Pd@ZIF-8 was characterized before and after exposure to 2,4-DCP. This comparison revealed that 2,4-DCP was adsorbed onto the surface of the composite during exposure. Moreover, while ZIF-8 maintained stability following the removal of 2,4-DCP, Fe 0 was partially oxidized and Pd functioned as a catalyst in the removal process. Furthermore, kinetic studies demonstrated that the initial adsorption of 2,4-DCP conformed to a pseudo-second-order model and the subsequent reduction conformed to a pseudo-first-order model, whereas isothermal adsorption best fit the Freundlich adsorption model. This observation suggested that removal mechanism of 2,4-DCP involved both adsorption and dechlorination. Finally, Fe-Pd@ZIF-8 was applied to practically remove 2,4-DCP from wastewater, showing a 74.4 % removal efficiency which indicated that the composite was a potential new nanomaterial for practically removing organic contaminants from wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Jian-Lei Qi,Dan Zhou,Qin-Qin Xu,Jian-Zhong Yin,Kun-Peng Yu,Hai-Xin Sun
In recent years, single-atom catalysts (SAC) have emerged as a new frontier in the field of heterogeneous catalysis owing to their unique properties and minimized metal dosage. Herein, the Pd-ZIF-8 single-atom catalyst was successfully fabricated using ZIF-8 as support, and Pd(hfac) 2 as the precursor using the supercritical CO 2 deposition method. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (AC-HAADF-STEM) images confirmed the formation of uniformly dispersed Pd atoms. Supercritical CO 2 has the advantage of zero-surface tension and high diffusibility, it can carry the molecules of Pd precursor into the micropores of ZIF-8. The dissolution and diffusion of precursor were observed by a visual view cell and the mechanism of the preparation was analyzed. Finally, semi-hydrogenation of phenylacetylene to styrene was performed to evaluate the catalytic activity of the prepared Pd-ZIF-8 catalyst. The conversion rate of 80.7% and selectivity of 92.2% were obtained at 70 °C and 4 h in the semi-hydrogenation of phenylacetylene.
研究领域:
催化化学
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材料科学
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纳米技术
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2015
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IF 3.453
Hong Jiang,Qing Yan,Rizhi Chen,Weihong Xing
Pd@ZIF-8 nanoparticles with uniform size and morphology were prepared via an assembly method that enables the crystallization of ZIF-8 in methanol in the presence of polyvinylpyrrolidone (PVP)-modified Pd nanoparticles. The molar ratios of Pd/Zn 2+ and 2-methylimidazole (Hmim)/Zn 2+ are important parameters affecting the physical and catalytic properties of the Pd@ZIF-8. The catalytic activities of the hybrid catalysts were evaluated by the hydrogenation of p -nitrophenol to p -aminophenol. The results indicate that the increase of Pd loading and p -nitrophenol conversion can be tuned by adding more amounts of PVP-Pd colloid, but a suitable amount of PVP-Pd (Pd/Zn 2+ ≤ 0.012) is helpful to the control of particle size of Pd@ZIF-8 and encapsulation of the Pd nanoparticles within the ZIF-8 crystals. Pd@ZIF-8 catalysts prepared with excessive or equal molar of Hmim relative to Zn 2+ have similar morphology and uniform particle size, where the Pd nanoparticles are fully confined within the ZIF-8 crystals without aggregation. Furthermore, the Pd@ZIF-8 catalysts exhibit the better catalytic performance for the p -nitrophenol hydrogenation owing to the high loading of well-dispersed Pd nanoparticles with the decreased Hmim/Zn 2+ molar ratio. This work would aid the development of high-performance Pd@ZIF-8 catalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Jingjing Zhu,Huaqiang Chen,Lan Wang,Engang Fu,Jianping Wu,Qilei Zhang,Lirong Yang,Gang Xu
A composite hollow mesoporous MIL-101@Pd@ZIF-8-30min (HM-MIL@Pd@ZIF-30min) nanocatalyst with hollow core and stable shell was developed in this study. Hollow mesoporous MIL-101(HM-MIL) was hydrothermally synthesized and employed as the supports of Pd nanoparticles by adopting a facile HM-MIL-template strategy to make ZIF-8 crystals uniformly overgrew on HM-MIL-101@Pd microcrystal cores. The obtained core-shell catalyst possessed hollow mesoporous structure, and the shell layer of ZIF-8 had additional advantages of abundant Lewis basic sites for heterogeneous racemization reaction. Compared with unmodified HM-MIL@Pd and solid MIL-101(Cr)@Pd@ZIF-8 (S-MIL@Pd@ZIF-8), HM-MIL@Pd@ZIF-8-30min had higher racemic chemical activity (conv. 99%) and selectivity (sel. R-amide 94%) in one-pot dynamic kinetic resolution (DKR) reaction system of rac -1-phenethylamine. The catalyst showed excellent stability, and the conversion and selectivity reached 95% and 93% respectively after ten catalytic cycles.
研究领域:
化学工程
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材料科学
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生物催化
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Shuaishuai Ding,Qing Yan,Hong Jiang,Zhaoxiang Zhong,Rizhi Chen,Weihong Xing
By adjusting the addition time of palladium nanoparticles, during the formation of ZIF-8, an efficient and facile method was proposed to control the palladium spatial distribution within ZIF-8 crystals. Characterizations reveal that the addition time can significantly affect the particle size of Pd@ZIF-8 and palladium spatial distribution. As the PVP-stabilized palladium nanoparticles are added at the early stage of the ZIF-8 formation, larger ZIF-8 crystals with completely embedded palladium nanoparticles can be obtained. Introducing the PVP-stabilized palladium nanoparticles later can lead to the formation of smaller ZIF-8 crystals with all the palladium nanoparticles on the outer surfaces of ZIF-8. The catalytic performance of Pd@ZIF-8 strongly depends on the palladium spatial distribution, and the Pd@ZIF-8 with completely embedded palladium nanoparticles can provide excellent product selectivity and better catalytic stability in the hydrogenation of alkenes.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yichi Chen,Wenxin Xu,Huimin Tian,Junbin Gao,Yicheng Ye,Hanfeng Qin,Hong Wang,Yanzhen Song,Chuxiao Shao,Fei Peng,Yingfeng Tu
Light-propelled nanomotors, which can convert external light into mechanical motion, have shown considerable potential in the construction of a new generation of drug delivery systems. However, the therapeutic efficacy of light-driven nanomotors is always unsatisfactory due to the limited penetration depth of near-infrared-I (NIR-I) light and the inherent biocompatibility of the motor itself. Herein, an asymmetric nanomotor (Pd@ZIF-8/R848@M JNMs) with efficient motion capability is successfully constructed for enhanced photoimmunotherapy toward hepatocellular carcinoma. Under near-infrared-II (NIR-II) irradiation, Pd@ZIF-8/R848@M JNMs convert light energy into heat energy, exhibiting self-thermophoretic locomotion to penetrate deeper into tumor tissues to achieve photothermal therapy. At the same time, functionalized with an immune-activated agent Resiquimod (R848), our nanomotors could convert a “cold tumor” into a “hot tumor”, transforming the immunosuppressive microenvironment into an immune-activated state, thus achieving immunotherapy. Dual photoimmunotherapy of the as-developed NIR-II light-driven Pd@ZIF-8/R848@M JNMs demonstrates considerable tumor inhibition effects, offering a promising therapeutic approach in the field of anticancer therapy.
研究领域:
纳米技术
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癌症治疗
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生物医学工程
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光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chemistry-An Asian Journal
·
2021
·Vol. 16
·期 19
·2952-2957
·
IF 4.568
Fengwei Zhang,Mengmeng Liu,Qiang Liu,Jingjing Li,Boyang Li,Zhengping Dong
Graphical A facile and in-situ methanol-mediated strategy was proposed to fabricate Pd@ZIF-8 catalyst for efficient and size-selectivity alkenes hydrogenation. In-situ encapsulation of tiny and well-dispersed Pd nanoparticles (Pd NPs) in zeolitic imidazolate frameworks (ZIFs) was firstly achieved using a one-pot and facile methanol-mediated growth approach, in which methanol served as both solvent and a mild reductant. The microstructure, morphology, crystallinity, porosity as well as evolution process of the catalysts were determined by TEM, XRD, N 2 adsorption and UV-vis spectra. Due to the complete encapsulation of such Pd NPs combined with ultrahigh surface area and uniform microporous structure of ZIF-8, the resulting Pd@ZIF-8-60 min nanocomposite exhibited more superior catalytic activity for olefins hydrogenation with TOF of 7436 h −1 and excellent size selectivity than previously reported catalysts. Furthermore, the catalyst displays excellent recyclability for 1-octene hydrogenation and without any loss of the Pd active species.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Bio
·
2023
·
IF 8.2
Dengming Zhou,Wenxiang Zhu,Hairong Liu,Feng Zhang,Xiaoyu Zhou,Xinyue Zhang,Yang Zhao,Yuting Huang,Xuanchu Duan
Trabeculectomy is the primary surgical approach used to treat glaucoma, but scarring of the filtering passage (filtering bleb) after surgery often leads to treatment failure. To address this issue, we have developed a drug release system called RSG/Pd@ZIF-8 PHBV film. This system enables the sustained release of an anti-fibrosis drug, aiming to prevent scarring. In vitro , the film has the function of continuous Rosiglitazone (RSG) release, with accelerated release after laser irradiation. The antibacterial experiments revealed that the film exhibited antibacterial rates of 87.0 % against E.coli and 97.1 % against S.aureus, respectively. Moreover, we confirmed its efficacy in a rabbit eye model undergoing trabeculectomy. After implantation of the film, we observed a prolonged postoperative period for reducing intraocular pressure (IOP), increased survival rate of filtering blebs, and improved long-term surgical outcomes in vivo . Additionally, the film exhibited excellent biosafety. In summary, the designed sustained-release film in this study possesses the aforementioned functionalities, allowing for the regulation of anti-scarring drug release without causing harm post-surgery. This personalized and precise anti-scarring strategy represents a significant advancement.
研究领域:
眼科
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药学
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生物材料
·
外科研究
✓ 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）