JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhongguo Wang,Xiong-Fei Zhang,Lian Shu,Lvye Yang,Jianfeng Yao
Three-dimensional and lightweight carbon aerogels are promising for next-generation wearable devices . As the most abundant renewable resource on the planet, wood provides a green and sustainable raw material for the manufacture of lightweight and elastic carbon materials. Here, a simple and sustainable design is proposed to directly prepare elastic carbon aerogel with a layered structure from the wood. Zeolitic imidazolate framework (ZIF-L) was deposited on a wood aerogel matrix without lignin and hemicellulose by in situ growth. The presence of ZIF-L significantly reduced the volume shrinkage of aerogel during carbonization, and the carbonized ZIF-L improves the contact area and provides electron transport path. The prepared aerogel has a stress of 42 kPa under 80% strain, and the elastic strength and volume remain both above 98% after 200 times of compression, indicating that the aerogel has excellent compressibility and fatigue resistance . Based on this particular structural design, as-obtained aerogel shows excellent sensitivity as pressure sensors to detect subtle signals. In addition, the carbon aerogel can be directly assembled into a all-solid-state symmetric supercapacitor that show promising electrochemical performance and could be potential candidates for high-performance supercapacitors in wearable devices.
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IONICS
·
2023
·Vol. 29
·期 4
·1627-1637
·
IF 2.8
Yu Rui,Wang Qing,Li Zhaokuan,Su Hao,Lan Yongzhi
By designing the composition of transition elements and combining the adjustable structure of MOFs, it is reported that the synthesis of bimetallic ZnCo-MOFs based on different Zn/Co molar ratios, then the NiZn 1 Co 2 -LDH nanospheres are synthesized by Ni 2+ hydrolysis. Compared with the bimetallic NiZn-LDH and NiCo-LDH, the trimetallic layered hydroxide NiZn 1 Co 2 -LDH after adding Zn 2+ reached a high specific capacity of 217.3 mAh g −1 at 1 A g −1 . Additionally, both have excellent cycle stability (84.6% capacity retention after 5000 charge–discharge cycles at 10 A g −1 ) and strong rate performance (72.47% capacity retention rate at 10 A g −1 ) as well. Furthermore, a hybrid supercapacitor (HSC) with NiZn 1 Co 2 -LDH as positive electrodes and activated carbon as negative electrodes was fabricated. The HSC device delivered a high energy density of 45 Wh kg −1 at a power density of 774.1 W kg −1 and excellent cycling stability (specific capacity retention of 92% after 10,000 cycles).
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Catalysts
·
2022
·Vol. 13
·期 1
·81
·
IF 4.501
Ying Zhang,Junya Liao,Hao Liang
DNA-based biomimetic enzymes have attracted extensive attention due to their unique structure and stability compared to natural enzymes. Meanwhile, the specific sequences of DNA itself also have a catalytic effect. Herein, we first designed three guanine-rich DNA sequences numbered c−Myc3c, PG4TC, and TTT to construct g−quadruplex/hemin DNAzymes. Then, the g−quadruplex/hemin DNAzymes with the best activity were selected by a comprehensive examination of activity, degradation rate, and affinity. Subsequently, the stability and reusability of UiO66−DNAzymes were investigated using UiO66 as the carrier to immobilize DNAzymes. The results showed that UiO66−DNAzymes had excellent reusability and stability. Finally, UiO66−DNAzymes were successfully used for glucose detection by cascading with glucose oxidase (GOx) with a detection limit of 0.62 μM. The constructed glucose sensor had a good specificity, which is of great significance for developing a novel, accurate, fast, and economical glucose detection sensor.Keywords:metal-organic frameworks;DNAzymes;enzyme immobilization;biomimetic enzymes;glucose detection
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RSC Advances
·
2022
·Vol. 12
·期 45
·29177-29186
·
IF 4.036
Zhao Qin,Yanqin Xu,Lin Liu,Min Liu,Hanjun Zhou,Liyue Xiao,Yuan Cao,Changguo Chen
Electrodes for supercapacitors made from metal–organic frameworks (MOFs) are still hindered by electron transfer properties. Therefore, an electrode composite material Ni-MOF@PPy was synthesized from a Ni-based metal–organic framework (Ni-MOF) doped with poly-pyrrole (PPy) using a simple chemical oxidation method to improve its electron transfer property. After introducing the electrochemically active substance K4Fe(CN)6 into the electrolyte, the composite material had a specific capacitance of 1815.4 F g−1 at a current density of 1 A g−1. Ni-MOF@PPy and active carbon (AC) as the positive and negative electrodes have been used, respectively, to assemble asymmetric supercapacitors (ASCs) in the KOH and K4Fe(CN)6 mixed electrolyte. This novel Ni-MOF@PPy//AC ASC energy storage device can provide 38.5 W h kg−1 energy density, 7001 W kg−1 power density, and 90.2% capacitance retention after 3000 cycles. Therefore, Ni-MOF@PPy//AC ASC is an excellent energy storage device with practical and economic value. The synergistic effect strategy proposed in this work can be easily applied to develop other MOFs with unique crystal structures as well as other redox active additives, providing new avenues and research ideas for exploring novel energy storage devices.
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PubMed
高影响因子
CARBON
·
2022
·
IF 11.307
Jing Chen,Ying Chen,Shuying Li,Jiao Yang,Jianbin Dong,Xiaoquan Lu
Tyrosine is the precursor of some neurotransmitters such as thyroxine and dopamine. It has the effect of regulating emotions and stimulating the nervous system. Changes in tyrosine levels in the human body are associated with certain diseases. Therefore, it is very necessary to prepare a new type of tyrosine sensor. In this work, an enzyme-free electrochemical sensor based on MXene/CNTs/CuMOF composite was developed for the detection of tyrosine. Embedding carbon nanotubes (CNTs) into MXene effectively prevented the aggregation of MXene sheets. Further modification of MXene/CNTs materials with CuMOF octahedral particles with porous structure can improve the porosity and catalytic capability of the composites. Under the optimal detection conditions, the prepared sensor has good linearity in the detection of tyrosine within range 0.53 μM–232.46 μM with a limit of detection (LOD) of 0.19 μM. The stability and selectivity of the sensor is high, and can be used to detect tyrosine in human serum.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 28
·15116-15126
·
IF 14.511
Yue Hu,Yuqi Wang,Zhou Fang,Xinyi Wan,Mengyang Dong,Zhizhen Ye,Xinsheng Peng
Developing efficient water adsorbents for atmospheric water harvesting in desert regions still remains a challenge due to the lack of useful strategies to enhance low-pressure water uptakes and adsorption–desorption kinetics. Herein we demonstrate a simple and efficient polyvinylpyrrolidone (PVP) assisted self-assembly strategy for the fabrication of core–shell MOF-801@MIL-101(Cr) (M-8010) supraparticles. The water uptake capacity of the prepared supraparticles is about 225% and 390% higher than that of pure MOF-801 and MIL-101 at 8% RH, respectively, benefiting from the synergistic effect between the preconcentration functions of shell MOF-801 and the high storage capacity of core MIL-101. Fast water capture and release kinetics of M-8010 supraparticles is also achieved. Their water collection rate is estimated to be about 0.253 Lwater/kgadsorbents per day under 10–20% RH, demonstrating that the M-8010 supraparticles are a great potential and stable adsorbent for water harvesting under extremely arid environments. This work may pave a new way to design MOF@MOF supraparticles for high-performance water harvesters in desert areas.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Huajuan Wang,Yiming Wu,Yudong Wang,Han Zou,Hongxun Wang,Min Zhou
The synthesis of functional antibacterial nanoplatforms for killing pathogenic bacteria is urgent. Among them, combining traditional antibiotics with antimicrobial photodynamic therapy (PDT) is an attractive means. Here, we synthesized a multimodal antibacterial nanoplatform (denoted as Van/PCN) based on PCN-224 and vancomycin (Van). PCN-224 is a kind of photosensitizer-based nanoscale metal organic framework (pMOF), which not only possessed large surface area and many binding sites for loading Van but also had the ability to produce ROS under visible light irradiation. Van/PCN killed bacteria by Van and ROS, achieving a synergistic antibacterial effect. Since Gram-positive bacteria are sensitive to Van, this antibacterial nanoplatform has great potential to treat bacterial infections caused by Gram-positive pathogens.
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ACS Nano
·
2023
·
IF 17.1
Zhiwei Chen,Yaoji Sun,Jiawei Wang,Xi Zhou,Xiangjian Kong,Jiashen Meng,Xingcai Zhang
The intelligent responsive drug delivery system has great application potential in cancer precision therapy. Although many antitumor methods have been developed based on drug delivery systems, most of them yet suffer from poor antitumor efficiency. In this project, a near-infrared and pH dual-response multimodal collaborative platform for diagnosis and treatment (PCN-DOX@PDA) was constructed. We used PCN-600 as a vehicle loaded with antineoplastic drugs and polydopamine (PDA). Under 633 nm laser irradiation, the ligand tetrakis(4-carboxyphenyl)porphyrin (TCPP) in PCN-600 can generate singlet oxygen (1O2) and kill tumor cells. PDA is used as photothermal agent of PTT. PCN-DOX@PDA achieves the intelligent release of antitumor drugs by responding to the weak acidity of the tumor microenvironment and thermal stimulation generated by NIR irradiation. In addition, since the central ion of PCN is Fe3+, PCN-DOX@PDA realizes the diagnosis and treatment of tumors through magnetic resonance imaging-mediated tumor chemotherapy and photothermal and photodynamic synergistic therapy. This triple synergistic strategy showed excellent biocompatibility and antitumor ability in in vivo experiments on a 4T1 tumor-bearing mouse model, indicating that PCN-DOX@PDA has a good development prospect in the field of precision cancer therapy and diversified biomedical applications.
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Wang Xiufeng,Zhou Bo,Huang Yuhan,Wang Xiaoyu,Xu Shuping,Li Moyan,Wang Shirui,Yang Sizhuo,Cui Haiyang
Metal–organic frameworks (MOFs) are widely used for enzyme immobilization due to their tunable pore structures and high stability. However, whether a relatively universal MOF carrier can support diverse enzymatic reactions remains unclear. Herein, we systematically evaluated 120 MOF–enzyme–substrate combinations using ten representative MOFs, three hydrolases (CRL, CALB, and BsEst), and four ester substrates, and then extended the identified carriers to three additional enzymes spanning catalase, oxidase, and protease reactions (GOx, Typ, and BlCAT), examining each with a single substrate. Overall, UiO-66 and UiO-66-NH 2 showed the most consistently favorable relative apparent activity. Among the selected materials, UiO-66 and UiO-66-NH 2 emerged as universal carriers, enhancing catalytic activity by up to 1.6-fold compared with free enzymes under harsh conditions, including elevated temperatures, pH 3.5–10.5, and the presence of toxic molecules. Molecular dynamics simulations combined with the analysis of 45 structural, solvation, and energetic descriptors revealed two key mechanisms underlying the superior performance of Enzyme/UiO-66(–NH 2 ) systems: preservation of internal hydrogen-bond networks in both substrate-bound and substrate-free states, and framework-assisted substrate enrichment near active sites through enhanced adsorption. This work provides molecular insights into MOF–enzyme–substrate interactions and establishes potentially transferable design principles for the MOF-mediated immobilization of other enzymes.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2014
·Vol. 30
·期 3
·356-361
·
IF 1.119
Han Pengfei,Yuan Changfu,Xu Junyi,Liu Jin
We reported a dripping solvothermal method for synthesizing metal-organic framework-5(MOF-5). It started from separately dissolving Zn(NO 3 ) 2 and terephthalic acid(H 2 BDC) in dimethyl formamide(DMF), and then dripping one solution into the other. Results of SEM, XRD and laser particle size distribution show that regular cubic-shaped and micro-crystallite powder of MOF-5 can be obtained. The d
0.5 (volume-median-diameter) values are 4.32 μm for particles prepared by dripping Zn(NO 3 ) 2 into H 2 BDC(ZH) and 9.32 μm for those prepared by dripping H 2 BDC into Zn(NO 3 ) 2 (HZ), much smaller than 22.7 μm that of particles prepared by the traditional adding water solvothermal method(L). The standard deviations of the particle size distributions fitted by the GaussAmp model are 2.49, 4.38 and 15.4 respectively for ZH, HZ and L, further revealing narrower size distributions of particles prepared by the dripping method. In addition, the Langmuir specific surface areas are 923 m 2 /g for ZH and 868 m 2 /g for HZ. The TGA results present mass losses of 4.18% and 3.62% at 105 °C, 17.19% and 14.78% at 245 °C, 39.04% and 34.85% at 600 °C separately for ZH and HZ, which correspond to the removal of H 2 O, DMF and the decomposition of MOF-5. This indicates that MOF-5 has a strong adsorption ability for small molecules. Besides, the mass loss of 48.39%(ZH) and 41.02%(HZ) between 400 °C and 600 °C are less than the theoretical value of 57.81% for MOF-5 decomposition to ZnO, suggesting that an impure phase with an extra amount of ZnO may exist in the cavities of MOF-5.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jiarong Li,Zhi Yang,Guangfa Hu,Jianshe Zhao
Three methods are tried to synthesize a novel type of inorganic-organic hybrid catalyst (HPA@MOF@CA) for oxidative desulfurization by the composition of phosphomolybdenum tungsten heteropolyacid (H 3 PMo 6 W 6 O 40 ·nH 2 O abbreviated as HPA), MOF-199 and cellulose acetate (CA). The structure features of the catalyst are characterized through XRD, IR, XPS, N 2 adsorption-desorption and SEM analysis. The impregnation method was proved to be the best synthesis methods and considered to be a possibility for catalyst forming in industrial application. The best loading of heteropolyacid and optimal conditions for desulfurization were also investigated in this paper while the removal efficiency reached 99.23% with O 2 as oxidant at 313 K after 3 h. After the reaction, the catalyst can be simply recovered and reused 10 times with negligible decrease in the desulfurization rate. It is believed that the HPA@MOF@CA, as a novel catalyst, has a high catalytic activity for thiophen and has the potential to be used in industry.
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ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Xin Xie,Yaoyao Zhang,Lingjun Zhang,Jiangen Zheng,Yingzhou Huang,Huanbao Fa
Benefiting from the noble metal nanoparticle core and organic porous nanoshell, plasmonic metal–organic frameworks (MOFs) become a nanostructure with great enhancement of the electromagnetic field and a high density of reaction sites, which has fantastic optical properties in surface plasmon-related fields. In this work, the plasmon-driven interfacial catalytic reactions involving p-aminothiophenol to 4,4′-dimercaptoazobenzene (trans-DMAB) in both the liquid and gaseous phases are studied in plasmonic MOF nanoparticles, which consist of a Ag nanoparticle core and an organic shell (ZIF-8). The surface-enhanced Raman spectroscopy (SERS) spectra recorded at the plasmonic MOF in an aqueous environment demonstrate that the reversible plasmon-driven interfacial catalytic reactions could be modulated by a reductant (NaBH4) or oxidant (H2O2). Also, the situ SERS spectra also point out that plasmonic MOF (AgNP@ZIF-8) nanoparticles exhibit much better catalytic performance in the H2O2 solution compared to pure Ag nanoparticles for the anti-oxidation caused by the MOF shell. It is surprising that although there is greater SERS enhancement obtained at pure Ag nanoparticles, the plasmon-driven interfacial catalytic reactions only occur at plasmonic AgNP@ZIF-8 nanoparticles in the gaseous phase. This interesting phenomenon is further confirmed and analyzed by simulated electromagnetic field distributions, which could be understood by the effective capture of gaseous molecules by the organic porous nanoshell. Our work not only explores the plasmonic MOF nanoparticles with unique optical properties but also strengthens the understanding of plasmon-driven interfacial catalytic reactions.
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