Journal of Applied Spectroscopy
·
2019
·Vol. 86
·期 1
·89-95
·
IF 0.675
Wang Haojiang,Wang Xuan,Bian Wei,Sun Tijian,Cai Zongwei,Wei Jiancong
Core-shell magnetic metal organic nanocrystals were synthesized and used as matrix for matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). Four nitropolycyclic aromatic hydrocarbons (nitro-PAHs) were successfully detected by using negative-ion MALDI-TOF MS without background interference. Furthermore, the magnetic nanocomposites (MNCs) coated with zeolitic imidazolate framework-8 (ZIF-8) showed excellent adsorption and enrichment capacity, and can be isolated with a magnet and directly spotted on the stainless steel plate for MALDI measurement. It was also analyzed nitro-PAHs in PM2.5 samples using the ZIF-8-coated magnetic nanocomposite as adsorbent and matrix.
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Energy Technology
·
2024
·Vol. 12
·期 3
·2301166
·
IF 3.6
Yanyi Liu,Jian Wei,Xinyu Qiao,Xueting Li,Hao Zhang,Houfei Xiong
Lithium–sulfur (Li–S) batteries are favored as ideal batteries for next-generation electrical stored energy systems owing to their high theoretical energy diversity and low operating costs. Therefore, the development of Li–S batteries with excellent rate capability and stable cycling is still a challenge. In this article, the electrochemical performance of lithium–sulfur batteries with high capacity and long cycle stability is achieved through dual physical and chemical adsorption effects using polypyrrole (PPy) attached to Co 3 O 4 /TiO 2 heterojunction structures based on metal–organic frameworks (MOFs) backbone materials. Co 3 O 4 /TiO 2 polyhedra form a built-in electric field, which is also a good adsorbent for polysulfides PPy nanotubes have a vacant structure, thus minimizing the volume expansion during deformation and maintaining the stability of the structure. The reversible specific capacities of lithium–sulfur batteries prepared based on Co 3 O 4 /TiO 2 /PPy electrodes are 1095 and 739.4 mAh g −1 at 0.1 C and 1 C multiplicity, respectively, and the capacity retention rate is 77.84% after 500 cycles at 1 C multiplicity. The structural design of the S@Co 3 O 4 /TiO 2 /PPy anode demonstrates an excellent ability to limit LiPS and has great potential to provide a promising avenue for the practical application of lithium–sulfur batteries.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Shuang Liu,Chao Liu,Hejiao Zhang,Weizhen Zhang,Wei Ding,Huaili Zheng,Hong Li
The sulfite (S(IV))-based advanced oxidation process (AOP) has emerged as an appealing alternative to the traditional persulfate-based AOP for the elimination of organic contaminants from diverse water matrices. In this work, a silica reinforced ZIF-67(Co) catalyst (CZS) is fabricated, characterized and tested in the activation of S(IV) for the sulfamethoxazole (SMX) degradation. The prepared CZS demonstrates superior stability and catalytic ability for the degradation of SMX compared to ZIF-67(Co) across a broad pH range. Unlike the conventional radical-dominated oxidation systems, the CZS/S(IV) system for SMX degradation operates through a non-radical mechanism, featuring high-valent Co(IV) and singlet oxygen ( 1 O 2 ) as the predominated reactive species. The hydroxylated Co species exposed on the CZS surface is identified as the pivotal active site, realizing the S(IV) activation through a complexation-electron transfer process, resulting in the production of various reactive intermediates. Co(II) undergoes the conversion to Co(IV) by generated HSO 5 − , and 1 O 2 predominantly originates from the intermediate SO 4 •− . Profiting from the highly selective oxidation capacities of Co(IV) and 1 O 2 , the established oxidative system demonstrates a remarkable interference resistance and exhibits an exceptional decontamination performance under real-world water conditions. In short, this work provides a sustainable S(IV)-based oxidation strategy for environmental remediation via non-radical mechanism.
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Materials
·
2018
·Vol. 11
·期 9
·1756
·
IF 2.467
Mi Zhang,Yu Gao,Yixing Zhan,Xiaoqing Ding,Ming Wang,Xinlong Wang
Degradable, flame retardant, and flexible nanocomposite films with low dielectric constant were prepared with poly (lactic acid) (PLA), nano ZIF-8@GO, and degradable flame-retardant resorcinol di(phenyl phosphate) (RDP). The SEM results of the fractured surfaces indicated that ZIF-8@GO and RDP were dispersed uniformly in the PLA matrix. The prepared films had good mechanical properties and the tensile strength of the film with 1.5 wt% of ZIF-8@GO was increased to 48.2 MPa, compared with 38.5 MPa of pure PLA. Meanwhile, the nanocomposite films were flexible due to the toughing effect of RDP. Moreover, above 27.0% of limited oxygen index (LOI) and a VTM-0 rating were achieved for the nanocomposite films. The effects of nano ZIF-8@GO hybrids and RDP on the dielectric properties were investigated, and the results showed that ZIF-8@GO and RDP were beneficial in reducing the dielectric constant and dielectric loss of the nanocomposites.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2025
·
IF 3.8
Liu Jiannan,Xiao Wenxiang,Shao Liuwen,Chen Xinxin,Li Hua
As a critical index for heavy metal toxicity, the quantitative detection of silver ions (Ag + ) is essential for health assessment and environmental monitoring. A sensing platform based on composite gold nanoclusters with dual emissions located in the near-infrared (NIR) range has been constructed for highly sensitive Ag + quantification. Dual-emissive glutathione-functionalized gold nanoclusters (GSH-AuNCs) were first synthesized via a one-pot hydrothermal method. Then, the weak NIR emissions were effectively enhanced by introducing thiolated β-cyclodextrin to regulate the surface ligands of clusters and by ZIF-8 encapsulation to allow the spatial nanoconfinement effect. The GSH-AuNCs nanocomposite exhibited dual-channel emission peaked at 610 nm and 810 nm under 437 nm excitation. Compared with the native clusters, the fluorescent emissions were enhanced with total factors of 6.86-fold at 610 nm and 2.32-fold at 810 nm. The sensing nanocomposite can specifically complex with Ag + by the surface thiol groups and β-cyclodextrin cavities on clusters. The interaction between the fluorescent composite and Ag + changed the ligand-to-metal charge transfer (LMCT) of the clusters and caused fluorescence enhancement at 610 nm and quenching at 810 nm. This opposite variation trend in the fluorescence intensities gives the possibility of constructing a ratiometric fluorescent probe for Ag + detection. The dual-emission intensity ratio (F 610 /F 810 ) demonstrates a quantitative relationship with Ag + concentration (C Ag+ ). The sensing system possesses a linear response range of 0.02~5.00 μmol/L in pH 8.5 buffer, achieving a detection limit of 11.6 nmol/L (S/N = 3). Measurement results of real serum and water samples confirmed that the sensing platform had good accuracy and exceptional anti-interference capability for Ag + detection. Graphical Schematic synthesis of GSH-AuNCs, GSH-AuNCs@β-CD/ZIF-8 assembly, and the fluorescence sensing of Ag + .
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 12
·841
·
IF 5.3
Zhao Yue-Dan,Chen Ke-Yan,Xia Lei,Jin Chen-Yu,Zhao Jun-Jian,Li Hai-Jie,Xu Hou-Jun,Wang Man-Man
Mixed-ligand metal organic frameworks have received great attentions as novel sorbents for sample preparation due to their fascinating structures and intriguing functionalities. Here, we report the fabrication of mixed-linker ZIF-8-90 s with tunable properties for effervescent tablet-assisted dispersive solid-phase extraction (ET-DSPE) of polycyclic aromatic hydrocarbons (PAHs) in environmental water before HPLC separation and hydroxyl metabolites of PAHs (OH-PAHs) in urine samples prior to LC-MS/MS. ZIF-8-90 s based effervescent tablets possessed the high affinity towards analytes via Zn-O bond and π-π interaction, and afforded a great excluding ability to interfering components from urine samples. ET-DSPE of PAHs from 15 mL water sample with ZIF-8 25 -90 75 gave enhancement factors of 122–155, linear ranges of 4-10 5 ng/L, detection limits ( S/N = 3) of 1–8 ng/L, and recoveries of 81.1%-103%. For the determination of OH-PAHs, the proposed ET-DSPE method using ZIF-8 85 -90 15 allowed direct loading of 4 mL of crude human urine sample and provided the linearity range of 0.004-100 ng/mL, detection limits of 0.001–0.008 ng/mL, and recoveries of 82.1%-104%. In conclusion, ZIF-8-90-based ET-DSPE coupled with HPLC and LC-MS/MS were successfully applied to monitor both PAHs in environmental water and OH-PAHs in urine in a facile, efficient and reliable way. Graphical
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jing Huang,Li Wang
This study demonstrates a green and sustainable strategy for efficient single-step recovery of cerium through the rational design of core–shell Fe 3 O 4 @ZIF-8 nanocomposites. The material is comprehensively characterized in terms of morphology, magnetic properties, functional groups, and pore structure. Adsorption studies reveal pH-dependent recovery behavior, with optimal performance in the pH range of 3.9–7.2. Analysis of isotherms and thermodynamics confirms the endothermic nature of the recovery process, showing a monotonic increase in the maximum adsorption capacity from 110 mg g −1 to 185 mg g −1 as temperature rises from 283 K to 328 K. Notably, the effect of ionic strength (IS) suggests that NaCl significantly enhances Ce(III) recovery efficiency, while K 2 SO 4 exhibits marked suppression. Competitive adsorption experiments reveal stronger interference from heavy REEs (Ho 3+ /Tm 3+ ) compared to light REEs (La 3+ ). The fundamental mechanisms are elucidated through multiscale interaction analysis, revealing a synergistic process combining dual-phase transition dynamics and photoinduced redox reactions. The surface architecture of magnetic core evolves from initial ZnO-dominant nanocrystals to ZnO/CeO 2 heterostructures, and ultimately stabilizes as a CeO 2 -enriched framework with increasing Ce(III) concentrations. Moreover, across the time scale, the speciation of surface-adsorbed cerium underwent a gradual transition from Ce(III)-dominance to Ce(IV)-dominance, ultimately forming a regime where Ce(IV) (CeO 2 ) served as the primary species. This progressive transformation enables in situ immobilization and single-step recovery of Ce(III) under mild conditions, establishing a novel paradigm for REEs recovery technology.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jin Zhang,Hanxuan Zeng,Lingjun Bu,Shiqing Zhou,Zhou Shi,Lin Deng
In this study, zero valent copper (Cu 0 ) was incorporated into ZIF-67 to construct Cu 0 and cobalt/nitrogen doped carbonaceous frameworks x -Cu@Co N C y . The obtained Cu@Co N C was employed to activate PMS to degrade naproxen (NPX) in aqueous phase. Influencing factors on NPX degradation were investigated, including mole ratio of Cu/Co, pyrolysis temperature, pH, catalyst dosage, PMS concentration, and coexisting inorganic anions. In the presence of 0.5 mM PMS and 25 mg/L 1:3-Cu@Co N C 900, complete degradation of NPX (50 μM) could be achieved in 20 min within a wide pH range of 3 to 10. The superior catalytic activity of Cu@Co N C 900 for PMS activation was related to the increased surface –OH groups, accelerated electron transfer rate induced by Cu 0 with strong conductivity, formed surface PMS complexes with high oxidation activity, and synergistic effect between Cu and Co. EPR analysis, radical scavenging and probe tests excluded the participation of SO 4 − and OH in NPX degradation. Nonradical pathways of electron transfer from NPX to PMS and 1 O 2 oxidation contributed to the excellent degradation. The 1:3-Cu@Co N C 900 demonstrated a decent degradation performance even after five consecutive recycles with low cobalt and copper ions leaching due to the encapsulation of Co and Cu on N -doped porous carbon. Further, the intermediates of NPX degradation were identified, and three possible degradation pathways were proposed. Overall, this work provides a feasible strategy to improve the stability and catalytic activity of ZIF-67 by the incorporation of Cu 0 .
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Xu Xu,Xiang Li,Guibin Liu,Xixi Wei,Daming Feng,Lei Zhang
In recent years, efficient oil–water separation has gradually become an indispensable part of environmental treatment. Superhydrophobic/superoleophilic materials with excellent self-cleaning performance are urgently required and remain challenging in the investigation of practical, rapid, and efficient separation of oil–water mixture and emulsion, especially those with robust surfaces that can be used in harsh conditions. In this work, a novel superhydrophobic/superoleophilic material was first fabricated by in situ constructing PDMS@ZIF-7/Cu3(PO4)2 hierarchical architectures on a copper mesh, which was adopted as a high flux and efficient separation material for gravity-driven separation of oil–water mixture as well as emulsion. The introduction of crucial Cu3(PO4)2 nanosheet interlayers created the ideal hierarchical structures and serve as partial templates for the subsequent in situ growth of hydrophobic ZIF-7 nanosheets. An improved superhydrophobicity (CA = 155°), permeation flux (102,000 L m–2 h–1), and preferred self-cleaning property were thus achieved by such manipulation of the copper mesh. The PDMS@ZIF-7/Cu3(PO4)2 mesh exhibited exceptional separation efficiency for diverse oil–water mixtures and emulsions attributed to the superhydrophobicity and the demulsification ability and considerable stability to cope with extreme environments including sunlight resistance, low temperature, and corrosion resistance, which prompted its promising applicability in cleaning emulsified wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
De Zhao,Zhihua Wu,Jian Yu,Hongzhi Wang,Yaogang Li,Yourong Duan
In this work, a synergetic fluorescence enhancement strategy based on micro/nanostructure optimization of ZnO nanorod arrays and in situ ZIF-8 coating was proposed for the highly sensitive microfluidic detection of carcinoembryonic antigen (CEA). The glass capillary was chosen as the microfluidic channel, and controllable construction of ZnO nanorod arrays on the inner wall of the microchannel was conducted via the intermittent reaction method. Additionally, the application of the optimal ZnO nanorod array to glass capillary-based microfluidic fluorescence detection was demonstrated. The fluorescence enhancement characteristic of the zeolitic imidazolate framework-8 (ZIF-8) towards organic fluorescence labels were investigated and successfully applied to protein marker detection. After formation of sandwich immunoassay on the ZnO/PAA nanorod arrays, the in situ ZIF-8 coating via a moderate chemical method could significantly improve the fluorescence intensity of fluorescent labels via direct contact. In CEA detection, the limit of detection (LOD) reached as low as 0.01 pg mL −1 , and the dynamic range was 0.01 pg mL −1 to 100 pg mL −1 . Hence, the microfluidic fluorescence detection strategy based on the ZnO nanorod arrays/PAA layers/ZIF-8 coating with a synergetic fluorescence enhancement effect provides a superior, promising, and highly sensitive approach for the detection of protein markers, including CEA.
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ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Fan Wang,Yueying Zheng,Xinggang Wei,Dawei Lan,Jintao Zhu,Yingjie Chen,Ziquan Wo,Tao Wu
This study designed a composite material with internal synergistic effects among multiple components to achieve highly selective adsorption of Cu (II). Through controlled synthesis, the Fe 3 O 4 /MnO 2 (3 1 0)/ZIF-67 composite was successfully fabricated, leading to significant improvement in adsorption selectivity , capacity, and adsorption rate. The experimental results showed that the composite is of outstanding selectivity in the adsorption of Cu (II), with a partition coefficient K of Cu (II) that was 2.2–5.3 times higher than that of other coexisting ions. Moreover, the composite exhibited a remarkable adsorption capacity of 1261.0 mg g −1 and a fast adsorption rate of 840.7 mg g −1 h −1 at 298 K. Additionally, its magnetic property facilitated easy separation from wastewater, thereby enhancing its potential for commercial applications. The synergetic effect mechanism was analyzed through characterizations and DFT calculations. Furthermore, the recyclability of the composite was investigated, which showed that after seven cycles, the adsorption efficiency remained at 85% of its initial efficiency. It can be concluded that Fe 3 O 4 /MnO 2 (3 1 0)/ZIF-67 has potential to address challenges posed by heavy metal pollution in copperplating effluents.
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2023
·Vol. 308
·期 11
·2300141
·
IF 3.9
Seojin Jung,Seokhee Chang,Na-Eun Kim,Yoon-Jae Song,Jooyoun Kim
A wound evolves with variable pHs depending on the healing stage, and the maintenance of mild acidic condition can help healing by deterring the formation of a biofilm. Herein, a dual-layer wound dressing with an acid-responsive zeolitic imidazolate framework–8 (ZIF-8) layer and an acid-modulating layer is designed to control the acid-dependent release of therapeutic agents for the improved healing process. The outer dressing layer is coated with curcumin-incorporated ZIF-8, where curcumin and zinc ions are released upon dissociation of ZIF-8 in an acidic condition. The inner layer, a pH modulator, is fabricated by electrospinning polyvinylpyrrolidone with addition of acetic acid. In vitro release test shows that the outer layer dressing attains a considerably higher release of curcumin and Zn 2+ under an acidic condition. Combined with the inner acidic layer, the dual layer dressing exhibits facilitated release of effective agents regardless of environmental pHs, attributed to the proper pH modulation to about 6.5. The anti-oxidant activity of curcumin and antibacterial activity of Zn 2+ are confirmed. The study highlights the novel proof-of-concept design of active wound dressing demonstrating the dual functions of pH regulation and the stimulus-responsive drug delivery.
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危险品化学品经营许可证（带存储）