COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Na Chang,Yan-Ru Chen,Feng Xie,Ya-Pan Liu,Hai-Tao Wang
It is of great importance to fabricate photocatalyst with high photocatalytic activity, and the formation of Z-scheme heterojunction photocatalyst has been proved to be an effective way to restrain the recombination of photo-induced carriers. In this work, Z-scheme AgCl/Ag-doped-ZIF-8 heterojunction is synthesized via a two-step process involving appropriate amount of cationic Ag ion doping into the imidazole ring of ZIF-8 framework and the precipitation of AgCl onto this Ag-doped-ZIF-8. The successful doping of ZIF-8 which decreases the band gap energy, enhances the light harvesting. Besides, the separation efficiency of photo-induced carriers is further improved due to the formation of Z-scheme AgCl/Ag-doped-ZIF-8 heterojunction, which is confirmed by photoelectrochemical experiments. As a result, the as-prepared AgCl/Ag-doped-ZIF-8 photocatalyst possesses excellent photocatalytic activity under visible light illumination. This work will provide a novel perspective for the design and construction of Z-scheme heterojunction for highly efficient photocatalysis.
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高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2021
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IF 5.268
Juan Han,Wenrui Huang,Man Zhao,Jiacong Wu,Yuanyuan Li,Yanli Mao,Lei Wang,Yun Wang
Herein, a glucose [email protected] composite (3-MPBA/ [email protected] ) with enhanced enrichment was enabled the rapid encapsulation of glucose oxidase (GOx) into microporous zeolitic imidazolate framework-8 (ZIF-8) for the first time. The 3-MPBA/ [email protected] not only has improved affinity and catalytic efficiency to the substrate but also can shorten the formation time. The optimum loading amount of GOx on ZIF-8 was determined to be 470 mg/g. The as-prepared 3-MPBA/ [email protected] composite maintained the native conformation of the enzyme and showed excellent bioactivity, even in chemical agents or at high temperature. Furthermore, the 3-MPBA/ [email protected] showed satisfactory reusability, preserving almost 80.8 % activity after 7 cycles. The Michaelis constant K m and specificity constant k cat / K m of the 3-MPBA/ [email protected] were 0.03 ± 0.02 mM and 63.87 ± 1.96 s −1 mM −1 , respectively, which were superior to corresponding values of free GOx. Therefore, the 3-MPBA/ [email protected] displayed high catalytic efficiency, high loading efficiency and enhanced stability. Moreover, a new type of visual colorimetric sensor for screening of the diabetes was realized through the 3-MPBA/ [email protected] , which provided a new strategy for the analysis field of glucose.
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高影响因子
ACS Applied Materials & Interfaces
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2021
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IF 9.229
Shi-Wen Lv,Ning Zhao,Jing-Min Liu,Fei-Er Yang,Chun-Yang Li,Shuo Wang
Integration of novel bio-/nanostructures as effective sensing platforms is still of great significance for robust and rapid analysis. Herein, a novel metal–organic framework-derived NiCo2O4 was synthesized via a feasible templating method. Significantly, redox couples of both Ni3+/Ni2+ and Co3+/Co2+ provided richer oxidation–reduction reactions, thereby leading to an enhanced catalytic activity. Furthermore, NiCo2O4 as an enzyme mimic with peroxidase-like activity and oxidase-like activity could oxidize colorless thylbenzidine (TMB) to blue oxTMB in the absence of H2O2. Thus, a sensitive chromogenic sensing platform for detecting Fe2+, thiourea, cysteine (Cys), and epigallocatechin-3-gallate (EGCG) was proposed. The colorimetric detection methods exhibited great features of low limit of detection (LOD) and broad linear range. Owing to the complexation reaction, the chromogenic sensing system of TMB + NiCo2O4 + Cys achieved effective detection of Cu2+ and Mn2+ with the LODs of 0.0022 and 0.0181 mM, respectively. Developed detection methods with wide linear ranges of 0.008–0.1 mM for Cu2+ and 0.08–1 mM for Mn2+ had excellent practical potential. Similarly, the reaction system of TMB + NiCo2O4 + EGCG could achieve the colorimetric detection of Cu2+ and Fe3+. The great chromogenic sensing performance for detecting Cu2+ and Fe3+ with a broad linear range and a low LOD could be also realized.
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高影响因子
ACS Applied Materials & Interfaces
·
2020
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IF 8.758
Jiangtao Xu,Cheng Cheng,Songmin Shang,Wei Gao,Ping Zeng,Shouxiang Jiang
Conventionally, surface-enhanced Raman spectroscopy (SERS)-active materials mainly include nanosized noble metals, semiconductors, or the complex of both, most of which are limited in practical applications because of their symbiotic materials, complex and difficult to control fabrication processes, and reuse and sampling challenges. To address these issues, novel SERS substrates have been developed in this study by anchoring zeolitic imidazolate framework-67 (ZIF-67) and derivatives of ZIF-67 to cotton fabric. The designed SERS substrates show extraordinary flexibility, an excellent enhancement factor, and reusable performance. By adjusting the lowest unoccupied molecular orbital and highest occupied molecular orbital of ZIF-67 through a doping process with different metal ions, the substrates exhibit a high enhancement factor of 6.07 × 106 and a low limit of detection of 10–8 M, as well as reusability resulting from photocatalysis. The enhancement process is studied based on charge transfer resonance, interband transition resonance, ground state charge transfer, and the light coupling effect. The results contribute to the approaches in designing SERS substrates by using ZIFs as unique SERS-active materials, and provide new insights into the development of novel SERS-active materials, along with promoting the use of SERS detection in the real world by improving the flexibility of substrates.
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高影响因子
RARE METALS
·
2020
·Vol. 40
·期 2
·478-488
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IF 2.161
Tang Jing,Zheng Sheng-Biao,Jiang Si-Xun,Li Jie,Guo Teng,Guo Jia-Hao
Abstract In this work, the framework of Co nanoparticles and nitrogen-doped carbon nanotubes (Co/NCNTs) derived from metal–organic frameworks (MOFs) through solid pyrolysis was successfully synthesized in the atmosphere of H 2 and Ar gases. The Co/NCNTs composites exhibited superior electrocatalytic performance for tert-butyl hydroquinone (TBHQ) oxidation due to the synergistic effect between chemical composition and the specific structure of Co nanoparticles and nitrogen-doped carbon nanotubes. It was found that the reaction underwent a quasi-reversible redox reaction with 37-fold higher anodic current for TBHQ at Co/NCNT-modified electrode when compared to bare glassy carbon electrode (GCE). In optimal condition, Co/NCNTs/GCE exhibited a linear range of 0.05–80.00 μmol·L −1 for detecting TBHQ, and the limit of detection (LOD) was estimated to be as low as 10 nmol·L −1 (signal/noise of S/N = 3). Moreover, the as-obtained modified electrode was successfully used to assay the content of TBHQ in edible oil samples. Graphic abstract
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Analytical Methods
·
2020
·Vol. 12
·期 38
·4657-4664
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IF 2.596
Linhua Yi,Yinghua Yan,Keqi Tang,Chuan-Fan Ding
As a member of MOFs, Zn-MOFs (ZIF-8) are seldom used in phosphopeptide enrichment because ZIF-8 is soluble in acid solutions. Therefore, properly designing a novel strategy to overcome the defect of ZIF-8 is necessary. In this study, a novel multifunctional nanoprobe was designed by uniting magnetic core, titania shell and hydrophilic metal–organic frameworks (named as Fe3O4@PDA@mTiO2@PEI-g-ZIF-8). Integrating the strategies of hydrophilic interaction affinity chromatography (HILIC), immobilized metal ion affinity chromatography (IMAC) and metal oxide affinity chromatography (MOAC), the Fe3O4@PDA@mTiO2@PEI-g-ZIF-8 mesoporous microspheres can enrich phosphorylated peptides and glycosylated peptides simultaneously. Fe3O4@PDA@mTiO2@PEI-g-ZIF-8 has high selectivity (maximum molar ratio β-casein/HRP : BSA = 1 : 1000), low detection limit (2 fmol) towards phosphopeptides and glycopeptides. Besides, the Fe3O4@PDA@mTiO2@PEI-g-ZIF-8 also exhibited a fine performance in the actual sample detection. In the experiment, taking saliva as a sample, 16 phosphorylated peptides were identified, and from a human serum sample, 4 phosphorylated peptides were selectively identified. All in all, the materials show great potential in the future study of phosphoproteomics and glycoproteomics.
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RSC Advances
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2021
·Vol. 11
·期 9
·5044-5054
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IF 3.361
Botao Qu,Yahong Han,Juan Li,Qian Wang,Bingyu Zhao,Xiaoyang Peng,Ruiping Zhang
Photoacoustic (PA) imaging has emerged as a promising bio-imaging technique due to its non-invasive visualization of lesions at great penetration depths. Fluorescence (FL) imaging in the second near-infrared window (NIR-II, 1000–1700 nm) achieves a higher imaging resolution and lower background signals compared to NIR-I. However, the single imaging method possesses its own disadvantages. Thus, we have demonstrated ZIF-8–IR820–MnPc–HA nanoparticles (ZIMH NPs) that can achieve visualization and localization of tumors in mice models with the help of a dual-modality PA/NIR-II FL imaging performance. Meanwhile, these excellent nanoparticles also induce the efficient generation of singlet oxygen (1O2) upon 808 nm laser illumination, and display excellent photodynamic therapy efficacy in cells, further indicating their potential application for in vivo PDT. In ZIMH NPs, hyaluronic acid (HA) impressively acts as a “sponge”, enhancing the generation of 1O2 and facilitating the cellular therapeutic effects. We believe that ZIF-8–IR820–MnPc–HA NPs present a brand-new strategy for the exploration of efficient PDT photosensitizers with dual-modality imaging performance for use in various biomedical applications.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
M. Usman Tahir,Hina Arshad,Wenyu Xie,Xianglong Wang,Muhammad Nawaz,Chao Yang,Xintai Su
Dodecahedral imidazolium framework-67 (ZIF-67) is synthesized in aqueous solution and used as a sacrificial template for the synthesis of uniform three-dimensional (3-D) hierarchical hexagonal flower-like nickel–cobalt layered double hydroxides (NiCo-LDH) by facile hydrothermal treatment. TEM and SEM results reveal that each microflower is composed of abundant two-dimensional (2D) ultrathin wrinkled nanosheets. The induction of 2,3,5,6-terafluroterephthalic acid (H 2 tfbdc) and hexamethylenetetramine (HMT) as an additive along with nickel nitrate hexahydrate plays a vital role to tune uniform hierarchical morphology and augmented electrochemical performance. The supercapacitor performance results show that (NiCo-LDH)S HH electrode has the best supercapacitor performance when it is used as a pseudo-capacitor. The maximum specific capacitance is 1765 F g −1 at the current density of 1 A g −1 with stable cycling performance. An asymmetric supercapacitor device assembled using (NiCo-LDH)S HH as the positive and activated carbon (AC) as the negative electrode attains a high energy density of 53.31 Wh kg −1 at a power density of 749.7 W kg −1 with 84.3% capacitance retention after 6000 cycles. This work provides a novel route for the design and synthesis of two-component hydrotalcite with 2D nanosheets having a large interlayer spacing of 9.3 d(Å) and its potential application in electrochemical energy storage.
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Journal of Materials Chemistry B
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2020
·Vol. 8
·期 28
·6128-6138
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IF 5.344
Ruihong Xie,Peng Yang,Shaojun Peng,Yongbin Cao,Xianxian Yao,Shengdi Guo,Wuli Yang
In recent years, zeolitic imidazolate framework-8 (ZIF-8) has become an attractive metal organic framework (MOF) material in drug delivery for cancer chemotherapy. However, as a drug delivery system, ZIF-8 still shows some disadvantages, such as short blood circulation time and poor tumor targeting, leading to reduced drug delivery efficiency and unsatisfactory treatment. Herein, we developed a phosphorylcholine-based zwitterionic copolymer coated ZIF-8 nanodrug (DOX@ZIF-8@P(MPC-co-C7A)), and the obtained nanodrug was prepared via a charge-conversional zwitterionic copolymer coating on DOX@ZIF-8 composites. In this system, DOX was encapsulated in the framework of ZIF-8, which could reduce the drug leakage in the bloodstream. The phosphorylcholine-based zwitterionic copolymer effectively extended the blood circulation time, resulting in enhanced tumor accumulation of the nanodrug. Once the nanodrug reached the tumor site, the surface charge of the system could rapidly convert to positive, resulting in an enhanced tumor cellular uptake. Finally, in the acidic environment inside intracellular organelles, DOX will be released rapidly for chemotherapy owing to the fast disintegration of ZIF-8 frameworks. Therefore, the obtained nanodrug could effectively inhibit the growth of A549-bearing tumors (93.2% tumor inhibition rate) with negligible side effects. Overall, this work significantly improved the drug delivery efficiency of ZIF-8, which may pave the way for the biomedical applications of ZIF-8 crystals in anti-tumor drug delivery.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Xiao Li,Shifan Yu,Kun Li,Chao Ma,Jing Zhang,Hui Li,Xiao Chang,Lei Zhu,Qingzhong Xue
It is imperative to research CO 2 separation membrane in terms of the issues of greenhouse gas emission. In this work, zeolitic imidazolate frameworks-8 (ZIF-8) particles in situ inserted by multiwalled carbon tubes (MWCNTs) (MWCNTs@ZIF-8) were embedded into Pebax matrix to fabricate mixed matrix membranes (MMMs). The incorporated ZIF-8 particles increased the free volume of membranes, resulting in the improvement of the CO 2 permeability. The functionalized MWCNTs in situ inserted into ZIF-8 particles not only avoided the aggregation of ZIF-8 particles but also enhanced the CO 2 adsorption property, resulting in the improvement of the CO 2 /N 2 selectivity. Furthermore, the MWCNTs can provide rapid transport channels for CO 2 molecules between two adjacent ZIF-8 particles and high mechanical properties for membranes. As a result, the MMMs with 8 wt% MWCNTs@ZIF-8 exhibited an excellent separation performance with CO 2 permeability of 186.3 Barrer and CO 2 /N 2 selectivity of 61.3, which surpassed the 2008 Robeson upper-bound. This study provided a new strategy for preparing high-performance CO 2 separation membranes.
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POLYMERS FOR ADVANCED TECHNOLOGIES
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2020
·Vol. 31
·期 5
·997-1006
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IF 2.578
Xinyao Lv,Wei Zeng,Zhiwang Yang,Yaoxia Yang,Yun Wang,Ziqiang Lei,Jinling Liu,Denglong Chen
A novel zeolitic imidazolate framework (ZIF-8) nanoparticles@polyphosphazene (PZN) core-shell architecture was synthesized, and then, ZIF-8@PZN and ammonium polyphosphate (APP) were applied for increasing the flame retardancy and mechanical property of epoxy resin (EP) through a cooperative effect. Herein, ZIF-8 was used as the core; the shell of PZN was coated to ZIF-8 nanoparticles via a polycondensation method. The well-designed ZIF-8@PZN displayed superior fire retardancy and smoke suppression effect. The synthesized ZIF-8@PZN observably raised the flame retardancy of EP composites, which could be demonstrated by thermogravimetric analysis (TGA) and a cone calorimeter test (CCT). The chemical structure of ZIF-8@PZN was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). Compared with pure epoxy, with the incorporation of 3 wt% ZIF-8@PZN and 18 wt% APP into the EP, along with 80.8%, 72.6%, and 64.7% decreased in the peak heat release rate (pHRR), the peak smoke production rate (pSPR), and the peak CO production rate (pCOPR), respectively. These suggested that ZIF-8@PZN and APP generated an intumescent char layer, and ZIF-8@PZN can strengthen the char layer, resulting in the enhancement in the flame resistance of EP.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Hang Chen,Ya-Qi wang,Fei Huang,Chao Tu,li Cui
A novel strategy for preparing Zeolitic Imidazolate Frameworks-8 (ZIF-8) based photocatalytic material with high efficiency, durability and recyclability is proposed. ZIF-8 is prepared by self-assembly layer-by-layer on carboxyl cotton fabric. The coordination bond formed by metal ions and carboxyl groups of carboxyl cotton fabric greatly enhances the interaction between particles and fabric. Semiconductor MoS 2 is grown in situ on the surface of ZIF-8 to improve photocatalytic activity of ZIF-8. The morphology and structure of prepared MoS 2 /ZIF-8/Carboxyl cotton are characterized. The influence of layer-by-layer self-assembled ZIF-8 on the charge separation efficiency and optical properties of functional materials are investigated by electrochemical impedance spectroscopy and photocurrent. Under visible light irradiation, this functionalized fabric has good degradability to methylene blue. About 99.8% of methylene blue aqueous solution is degraded after exposure to visible-light for 21 min. Furthermore, about 94.8% photocatalytic activity is still maintained even after six times of recycling. Possible mechanisms accounting for the enhanced photocatalytic properties are proposed. This fabrication method used in this study shows great potential in the development of textile-based multifunctional photocatalytic materials with high degradation efficiency and high recovery rate.
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危险品化学品经营许可证（带存储）