JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Dan Yang,Yang Luo,Shang Wei Yuan,Li Xia Chen,Pei Hua Ma,Zhu Tao,Xin Xiao
In recent years, most of the constructions on cucurbit[ n ]uril-based supramolecular polymers have been based on host–guest chemistry, however, this limits the choice of host and guest. Herein, we present a newly designed supramolecular polymer, namely Q[8]@PEG-HPTS formed by utilizing outer surface Q[8] interactions. In aqueous solution, the supramolecular polymer Q[8]@PEG-HPTS was obtained quickly and simply by mixing Q[8] with PEG-HPTS, where after, a variety of characterization techniques were employed to confirm the structure of the Q[8]@PEG-HPTS. The ability of this system to selectively recognize metal ions as well as pesticide molecules was also investigated; selectivity was observed for Fe 3+ and paraquat. The biocompatibility and excellent fluorescence properties associated with the constituents of the supramolecular polymer allowed for the imaging of HeLa cells. This system could image and trace the nucleus through the cytoplasm, indicating that it could enter and internalize HeLa cells. Finally, by continuously adjusting the ratio between Q[8] and PEG-HPTS, a Q[8]@PEG-HPTS hydrogel was obtained. This hydrogel exhibited a stimulated temperature response, and opens up further possibilities for exploring the applications of such supramolecular polymers.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Meilin Yin,Zhen Li,LiPeng Wang,Shaokun Tang
The fabrication of structural stable metal organic frameworks (MOFs) with large pore size by facile, rapid and environmentally friendly synthetic method remains a serious challenge. Herein, it is the first time to develop a novel synthetic strategy that rapidly enlarges the pore size of microporous ZIF-8 by employing polyvinyl pyrrolidone (PVP) as a modulator to induce defect formation in environmentally friendly supercritical CO 2 (scCO 2 ). Notably, the high solubility and low mass transfer resistance of reactants in scCO 2 and low surface tension nature of scCO 2 are the key factors for the rapid preparation of structural stable PVP/ZIF-8 with hierarchically pores. And the PVP modulator as a weak ligand not only facilitates pore size but also perturbs coordination to form coordination defects, exposing more coordination metal sites. These characteristics are beneficial to fast diffusion and adsorption of CO 2 molecules. In addition, the influences of reaction conditions on the morphology, pore parameter and CO 2 adsorption performance of PVP/ZIF-8 are investigated. The result indicates that the PVP/ZIF-8 prepared with 1:1 of Zn/PVP mass ratio at 90 °C and 30 MPa in supercritical environment have the highest CO 2 adsorption equilibrium capacity (2.02 mmol CO 2 /g sorbent) and great cycle stability, which should be attributed to hierarchically porous structure with interconnected macropores and micropores.
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Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 18
·4020-4027
·
IF 7
Min Feng,Xiaofang Chen,Yuhang Liu,Yan Zhao,Pran Gopal Karmaker,Jia Liu,Ya Wang,Xiupei Yang
Single-atom catalysts with atomically dispersed sites have been widely used as nanozymes for colorimetric sensing because their tunable M–Nx active centers are similar to those of natural enzymes. However, their low metal atom loading leads to insufficient catalytic activity and affects the sensitivity of colorimetric sensing, which limits their further applications. Herein, multi-walled carbon nanotubes (MWCNs) are selected as carriers to reduce the aggregation of ZIF-8 and improve the electron transfer efficiency of nanomaterials. Meanwhile, MWCN/FeZn-NC single-atom nanozymes with excellent peroxidase-like activity were prepared by pyrolysis on ZIF-8 doped with a second metal Fe. Based on the excellent peroxidase activity of MWCN/FeZn-NCs, a dual-functional colorimetric sensing platform for Cr(VI) and 8-hydroxyquinoline was established. The detection limits of the dual-function platform are 40 nM for Cr(VI) and 55 nM for 8-hydroxyquinoline. This work provides a highly sensitive and selective strategy for the detection of Cr(VI) and 8-hydroxyquinoline in hair care products, which has great application prospects in the field of pollutant detection and control.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Nuan Xu,Zhenhua Tang,Yan-Ping Jiang,Junlin Fang,Li Zhang,Xiaofang Lai,Qi-Jun Sun,Jing-Min Fan,Xin-Gui Tang,Qiu-Xiang Liu,Ji-Kang Jian
The widely used pesticide thiram is found in various environments and foodstuffs, posing a risk to human health and contaminating the environment. In this work, the novel SERS flexible sensor (FP/AgNWs@ZIF-8) consisting of silver nanowires and zeolite imidazole frameworks combined with filter paper was prepared for the sensitive and rapid detection of thiram on fruit peel surfaces. The effect that different coating cycles of ZIF-8 films exert on the Raman signal enhancement of the sensor was investigated. The results show that optimal Raman response to 4-Aminothiophenol (4-ATP) was demonstrated in the FP/AgNWs@ZIF-8(5) sensor, with a low LOD of 1.6 × 10 −15 M due to a coating period of 5. Furthermore, a novel SERS FP/AgNWs@ZIF-8 sensor with a porous and flexible structure on low-cost and eco-friendly paper was obtained, as to be immersed in a solution of thiram or wiped on a nectarine skin surface, and the highly sensitive LODs of 1.4 × 10 −12 M and 7.4 fg/cm 2 were achieved, respectively. Therefore, this facile, rapid, and sensitive flexible sensor at low-cost has excellent potential for pesticide residue detection and environmental toxicity analysis.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Ting Bao,Meiqi Wen,Wei Wen,Xiuhua Zhang,Shengfu Wang
In this work, a novel electrochemical biosensor was constructed for ultrasensitive interferon-gamma (IFN-γ) detection based on [email protected] imidazolate framework-8 hybrids anchored gold nanoclusters ( [email protected] ) and hemin/G-quadruplex DNAzyme decorated layered-branched hybridization chain reaction (LB-HCR). The two-dimensional [email protected] hybrids were utilized as template to anchor AuNCs through a sequential deposition method. On the [email protected] platform, an improved and efficient LB-HCR pattern was designed on the strength of traditional HCR with the cascade-like assembly of four hairpins. In which, HP1 and HP2 participated in traditional HCR process to form long double-helix DNA, AD1 and AD2 assembled alternately to facilitate the layerly chain-branching growth of DNA nanostructures. The target-triggered LB-HCR resulted in the generation of dendritic DNA nanostructures integrated with numerous in-situ formed hemin/G quadruplex DNAzyme as amplifying labels, which catalyzed the reduction of H 2 O 2 with thionine acted as the electron mediator to realize amplified signal output. This multiple-amplified strategy exhibited good analytical performance towards IFN-γ with a wide linear range form 1 fM to 50 pM and a low detection limit of 0.6 fM, holding promising application in disease diagnosis and monitoring.
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CHEMOSPHERE
·
2018
·
IF 4.427
Baida Kong,Xia Wang,Bingnan He,Lai Wei,Jianbo Zhu,Yuanxiang Jin,Zhengwei Fu
Fluorotelomer alcohols (FTOHs, F(CF 2 ) n CH 2 CH 2 OH) are members of per- and polyfluoroalkyl substances (PFASs) and are increasingly used in surfactant and polymer industries. FTOHs pose hepatotoxicity, nephrotoxicity and endocrine-disrupting risks. Nevertheless, there is limited research on the immunotoxic effects of FTOHs. In this study, we examined the immunotoxicity of 8:2 FTOH (n = 8) on murine macrophage cell line RAW 264.7. The results showed that 8:2 FTOH exposure reduced cell viability in dose- and time-dependent manners, inhibited cell proliferation and caused cell cycle arrest. Exposure to 8:2 FTOH downregulated the mRNA expression of some cell cycle-related genes, including Cdk4 , Ccnd1 , Ccne1 , and p53 , but also upregulated the mRNA expression of other cell cycle related genes, including Ccna2 , p21 , and p27 . Additionally, exposure to 8:2 FTOH under unstimulated and LPS-stimulated conditions downregulated the mRNA expression of pro-inflammatory genes, including Il1b , Il6 , Cxcl1 , and Tnfa , and secreted levels of IL-6 and TNF-α. Treatment with 8:2 FTOH upregulated the mRNA expression of antigen-presenting-related genes, including H2-K1 , H2-Ka , Cd80 , and Cd86 . The abovementioned immunotoxic effects caused by 8:2 FTOH in RAW 264.7 cells were partially or completely blocked by co-treatment with hydralazine hydrochloride (Hyd), a reactive carbonyl species (RCS) scavenger. However, exposure to 8:2 FTOH did not exhibit any effects on intracellular reactive oxygen species (ROS) level with or without LPS stimulation. Taken together, these results suggest that 8:2 FTOH may have immunotoxic effects on macrophages and RCS may underlie the responsible mechanism. The present study aids in understanding the health risks caused by FTOHs.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 6
·1-8
·
IF 5.479
Li Yufei,Zhang Huanhuan,Cai Xuan,Zhao Hongli,Magdassi Shlomo,Lan Minbo
Two kinds of carbon-based nanozymes were constructed from the same precursor of zeolitic imidazolate framework-8 (ZIF-8) for O 2 •− determination. Hollow carbon cubic nanomaterial (labelled as HCC) was obtained by chemically etching ZIF-8 with tannic acid and a subsequent calcination. A porous carbon cubic nanomaterial (labelled as PCC) was prepared by directly pyrolysis. Then HCC and PCC were immobilized on the surface of screen printed carbon electrodes (SPCE), fabricating HCC and PCC modified electrodes (denoted as HCC/SPCE and PCC/SPCE). HCC/SPCE, best operated at −0.5 V (vs. Ag/AgCl), has a sensitivity of 6.55 × 10 2 nA μM −1 cm −2 with a detection limit of 207 nM (at S/ N = 3) for O 2 •− sensing. And PCC/SPCE, best operated at −0.4 V (vs. Ag/AgCl), exhibited a superior performance for O 2 •− detection with a sensitivity of 1.14 × 10 3 nA μM −1 cm −2 and a low detection limit of 140 nM (at S/ N = 3). The two sensors possess excellent reproducibility and stability. They were used to sense O 2 •− released from HeLa cells.
Illustration of the synthesis of the hollow carbon cubic nanomaterial (HCC) and of the porous carbon cubic nanomaterial (PCC), and the scheme for detection of superoxide anions in HeLa cell.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Yating Wang,Xiu Dai,Yixing Zhan,Xiaoqing Ding,Ming Wang,Xinlong Wang
The zeolitic imidazole framework (ZIF-8) dotted chitosan (CS) nanocomposites (ZIF-8@CS) were fabricated via in-situ growth method. The morphology, structure and chemical state of ZIF-8@CS were investigated by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform IR spectroscopy (FTIR) and X-ray diffraction (XRD). The adsorption behavior of ZIF-8@CS composites on Congo Red (CR) in aqueous solution was systematically investigated. The adsorption isotherm data showed that the adsorption of CR by ZIF-8@CS was single-layer adsorption, which was consistent with the Langmuir isotherm model. The maximum adsorption capacity of ZIF-8@CS was 922 mg/g. The kinetics parameters were in accord with pseudo-second-order equation, which implied that the adsorption rate was mainly controlled by the chemisorption mechanism. The removal of CR was attributed to the participation of hydrogen bonds , electrostatic interactions, π-π conjugation and zinc coordination effects.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 1
·48048
·
IF 2.188
Guisong Wang,Wenzong Xu,Rui Chen,Wu Li,Yucheng Liu,Kai Yang
Zeolitic imidazolate framework-8 (ZIF-8) was synthesized at room temperature, and then added with expandable graphite (EG) to polyurethane elastomer (PUE) to study their flame retardancy and smoke suppression of PUE. The results showed that when the total flame retardant was 3 wt % and the ratio of ZIF-8 and EG was 1:3, it had the best effect on the flame retardancy and smoke suppression of PUE. Compared with pure PUE, the peak heat release rate, the total heat release, and the maximum smoke density values of Z1E3 decreased by 83.4, 42.6, and 22.4%, respectively. Moreover, the limited oxygen index value of Z1E3 increased to 30.2% and its UL-94 vertical burning test reached V-1 rating. This was because ZIF-8 synergized with EG to make the intumescent char layer compact, resulting in improved flame retardancy and smoke suppression of PUE. The specific mechanism of flame retardancy and smoke suppression is also discussed in this article. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48048.
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Solar RRL
·
2018
·Vol. 2
·期 9
·1800084
·
IF 0
Senyun Ye,Haixia Rao,Dongyang Zhang,Mengying Bian,Zifeng Zhao,Feidan Gu,Ziran Zhao,Yinlin Chen,Huiqiong Zhou,Zhiwei Liu,Zuqiang Bian,Chunhui Huang
The solution-processed 8-hydroquinolatolithium (Liq) has first been demonstrated as a highly effective cathode interfacial layer (CIL) in inverted perovskite solar cells (PSCs). Compared with the control device without a CIL, the Liq-based device possesses a faster charge transport rate, a lower surface work function of Ag electrode, a larger built-in potential, and a higher charge recombination resistance, probably due to the formed interface dipole between [6,6]-phenyl-C 61 -butyric acid methyl ester (PCBM) and Ag induced by Liq, which eventually results in a great improvement of device performance. After optimization, the Liq-based PSC has achieved a power conversion efficiency higher than 19%. These results will assuredly expand the present limited range of available solution-processable cathode interfacial materials for low-cost high-performance PSCs.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2018
·
IF 2.179
Mengmeng Fan,Fangyuan Gai,Yu Cao,Zhenbo Zhao,Yuhui Ao,Yunling Liu,Qisheng Huo
This work demonstrated the design and synthesis of millimetre-scale hierarchical porous spheres based on ZIF-8 and CS (chitosan) by in situ assembly and post-thermal treatment technology. The ZIF-8/CS spheres have been synthesized according to the assembly method, which exhibited honeycomb internal structures and micropores of 0.77 nm. While the annealed ZIF-8/CS spheres exhibited obvious mesopores with a BET surface area of 626.85 m 2 g −1 and maintained the honeycomb internal structures, which were obtained by calcinations in the tube furnace under nitrogen protection at 500 °C for four hours. The annealed ZIF-8/CS spheres exhibited hierarchical porous with macropores, micropores and mesopores after annealing process. The SEM image and the XRD pattern of annealed ZIF-8/CS spheres suggested the maintenance of shape and crystal structure of ZIF-8, indicated that the annealed ZIF-8/CS spheres were stable and robust. Particularly, the CO 2 uptake of annealed ZIF-8/CS spheres with 500 °C is 0.99 mmol/g, which obvious higher than that of as-synthesized ZIF-8/CS spheres and samples annealed at 450 °C, 525 °C and 550 °C. The enhancement of CO 2 uptake may attribute to the carbonization of CS and the enlarge micropores of ZIF-8 after annealing process. This approach could induce a simple way for industrial structuring ZIF-8-based adsorbents with improved CO 2 uptake.
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CRYSTENGCOMM
·
2018
·Vol. 20
·期 34
·5056-5060
·
IF 3.304
Guangming Li,Xun Wang,Jilin Zhang
An environmentally friendly synthetic route for carbon dots/ZIF-8 fluorescent powders has been developed. It was found that the carbon dots can promote the growth of ZIF-8 crystals. The carbon dots/ZIF-8 fluorescent powders can be fabricated at a relatively low 2-methylimidazole/Zn2+ molar ratio (10 : 1) in aqueous solution at room temperature. Different morphologies and sizes of the carbon dots/ZIF-8 fluorescent powders are easily obtained by adjusting the 2-methylimidazole/Zn2+ molar ratio. The as-prepared carbon dots/ZIF-8 fluorescent powders can afford multi-colored imaging of latent fingerprints on different substrates and show great potential for latent fingerprint detection.
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