CRYSTENGCOMM
·
2023
·Vol. 26
·期 1
·70-79
·
IF 3.1
Zhen Li,Bo He,Shaokun Tang
Hierarchically porous metal–organic frameworks (HP-MOFs) possess the advantages of the high porosity of MOFs and unique properties, such as a wide pore size range. Hierarchically porous ZIF-8 (HP-ZIF-8) was facilely fabricated via a one-step method in supercritical CO2 (scCO2) using a competitive ligand. The mesoporous structure and morphology of HP-ZIF-8 can be easily adjusted by changing the dosage of competing ligands and the reaction temperature. When the molar ratio of zinc acetylacetonate, 2-methylimidazole, and 2-butyl-1H-imidazole was 1 : 1 : 6, the HP-ZIF-8 with micropores (1.7 nm) and mesopores (3.9–30 nm) was synthesized at 50 °C and 30 MPa for 3 hours with excellent reproducibility. The as-synthesized ZIF-8 shows a high activity for CO2 adsorption, and the CO2 equilibrium adsorption capacity reached up to 1.49 mmol g−1 sorbent at 25 °C and 0.1 MPa. Moreover, the CO2 equilibrium adsorption capacity of HP-ZIF-8 was maintained at 1.36 mmol g−1 sorbent after 7 cycles.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
ChuanYu Lan,Yuandong Wu,Dajiang Mei,Shaoguo Wen,Thomas Doert
Three new complexes, namely (5,7-Dichloro-8-hydroxyquinoline)PbX (X=Br, I) ( 1, 2 ) and Pb2(5,7-Dichloro-8-hydroxyquinoline)4 ( 3 ), were synthesized through solvent evaporation at ambient temperature. The crystal structures and fluorescence emission properties of these complexes were systematically investigated. An analysis using single crystal X-ray diffraction revealed that complexes 1 - 3 form pseudo-dimeric structures through the interaction between lead and neighboring oxygen via secondary contacts. A comparison between the structures of complex 2 and [Pb(μ-Q)I] 2 , a complex of PbI 2 with 8-hydroxyquinoline, showed that the coordination polyhedron changed from a triangular pyramid to a distorted tetrahedron. This change may be attributed to the site resistance effect of the chlorine substituents coordinated to the quinoline ring. Complex 3 has a layered structure formed through secondary contacts and intramolecular hydrogen bonding C-H⋯O and C-H⋯Cl among the lamellar molecules. The maximum emission peak at 489 nm, 505 nm, and 543 nm for complex 1-3 can be assigned to the ligand-to-metal charge transfer (LMCT). The maximum emission peaks were red-shifted by 22 nm, 38 nm, and 75 nm, respectively, compared to the ligand. The number of ligands increases the conformational rigidity of the structure and the electron density on lead atoms causing the molecular structure to change, the energy alters, and the fluorescence peaks to move in the long-wave direction.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Conglin Zhang,Yinhui Yi,Yifan Zhou,Ruiyong Zhou,Gangbing Zhu
Electrochemical sensing is the commonly used method for the detection of heavy metal silver ion (Ag + ), while the conventional electrochemical sensors generally require the existence of electrode modifications and even electrodeposition step coupled with a single-mode readout. Herein, by preparing ZIF-8 organometallic frame load with platinum nanoparticles (Pt@ZIF-8) as nanozyme and o-phenylenediamine (OPD) as colorless substance, taking advantage of the superior peroxidase activity of Pt@ZIF-8 that can catalyze the oxidation of OPD to product electroactive/yellow 2,3-diaminophenazinc and the target-inhibited effect towards nanozyme activity from Ag + , a homogeneous electroanalysis coupled with colorimetry (HEA-CM) dual-mode sensing platform was designed for the first time to detect Ag + . Furthermore, the colorimetric images were converted on a smartphone to digital signals for the quantitative analysis. The designed strategy could offer multiple advantages such as electrodeposition-free, modification-free and dual channel readout. After investigating the sensing mechanism and experimental parameters, the analytical performance of the designed strategy was evaluated, obtaining extremely low detection limit (0.034 nM), reliable recovery rate (99.61 %-101.6 %) and wide linearity. This work offered an effective method for the simple, sensitive, rapid, accurate and multiplexed determination of Ag + , and also opened a new pathway for the detection of other heavy metals based on HEA-CM dual-mode strategy.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yuxiang Mao,Jun Cheng,Hao Guo,Lei Qian,Jiacan Tu,Weijuan Yang
To enhance catalytic acid-base sites in ZIFs and efficiently promote conversion of microalgal lipids, a bifunctional catalyst with single-atom Fe-N 4 sites and Fe nanoparticles (NPs) was synthesized by pyrolyzing Fe-doped ZIF-8. Compared with ZIF precursors, Fe nanoparticles and coordinated Fe ions in Fe-N 4 sites enhanced Lewis acidity, while increased uncoordinated N atoms enhanced Lewis basicity. Therefore, the acidity of Fe-NC increased from 0.473 to 1.845 mmol/g, while basicity increased from 0.172 to 0.439 mmol/g. DFT calculations showed that the adsorption energies of acetic acid on the Fe–N 4 and Fe NP were −0.536 eV and −0.397 eV, respectively, exceeding that (-0.190 eV) on the Zn–N 4 site. The energy barriers for rate-determining steps over the Fe-N 4 and Fe NP were + 0.32 eV and + 0.21 eV, respectively, which were lower than that (+1.01 eV) over the Zn-N 4 site. The maximum biodiesel yield reached 98.3% over Fe-NC catalyst, higher than that (84.5%) over ZIF-8 catalyst.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 8
·4068-4073
·
IF 3.925
Lin Li,Sijia Zhang,Yingying Li,Ting Wang,Xiaohong Hou
In this study, zeolitic imidazole framework-8/cellulose membrane (ZIF-8/CM) was fabricated through an in situ synthesis method. The composite was installed in a dismountable filter and used as a sorbent for lab-made microextraction in packed syringe (MEPS). The entire MEPS procedure can be performed through simple operation of filtration, since the macroporous cellulose membrane was introduced as the substrate for ZIF-8 powder. Coupled to a high performance liquid chromatography tandem ultraviolet detector (HPLC-UV), the proposed method was applied for the analysis of tetracyclines in water samples. The extraction parameters, including the adsorbent type, sample solution pH, sample volume, type and volume of the elution solvent, were systematically studied. Under optimized conditions, desirable linearity (r > 0.99 for three analytes), high sensitivity (limit of detection: 0.1373–0.8917 μg L−1), good precision (RSD < 6.3%) and ideal recovery (72.9–97.6%) were obtained. The proposed method was demonstrated to be efficient, easily operative and environmentally friendly.
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APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Fengyi Wang,Zhiguang Guo
Waste water pollution containing heavy metal ions has raised wide concern in environmental sustainability, calling for the development of high-efficiency and low-cost materials for waste water treating. Herein, a series of carbon fiber/Co-Al layered double hydroxide/zeolitic imidazolate framework-8 (CF/LDH/ZIF-8) composites were synthesized and used for the high-efficiency elimination of toxic chromium Cr (VI) from aqueous solutions. The morphology, phase composition, phase structure of the CF/LDH/ZIF-8 composites were investigated by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM) and nitrogen adsorption-desorption methods, respectively. The LDH/ZIF-8 films on the CF showed a homogeneous micro/nano scale porous structure , which was composed of Co Al LDH nanoplates and ZIF-8 nanocrystals. The nanocomposites showed high specific surface area of 156.9 m 2 g −1 and pore diameters distributed almost in a narrow range of 2.5–8.3 nm when the molar ratio of Al 3+ /Co 2+ reached to 2:3. High-efficiency elimination of toxic chromium Cr (VI) by the CF/LDH/ZIF-8 composites was confirmed by the absorption test which showed the high absorption capacities of Cr (VI) (378 mg/g). With the presence of CF/LDH/ZIF-8 composites in solution, toxic chromium Cr (VI) can be removed quickly, and the removal efficiency approached 99.3% approximately. Further, the results of cyclic tests indicated that the hierarchical CF/LDH/ZIF-8 composites exhibit excellent cyclic stability and can be fast regenerated in NaOH at 25 °C, rendering a widely application in environmentally friendly and high efficiency material for waste water treatment .
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TALANTA
·
2019
·
IF 4.916
Haijiao Gan,Hui Xu
In this work, an innovative aptamer-based magnetic adsorbent (Fe 3 O 4 @PDA-aptamer MNPs) was prepared by hydrothermal synthesis method followed by the surface functionalization of nanoparticles . After fixing in a steel stainless tube as sorbent of magnetic solid phase extraction (MSPE), an online magnetic solid phase extraction-high performance liquid chromatography-mass spectrometry (online-MSPE-HPLC-MS) method was developed and applied for the determination of 8-hydroxy-2′-deoxyguanosine (8-OHdG) and monohydroxylated polycyclic aromatic hydrocarbons (OH-PAHs) simultaneously in urine. The synthesized sorbent presented outstanding features, including large specific surface area, high enrichment capacity and excellent stability. High throughput analysis can be achieved by affinity-specific adsorption of 8-OHdG and non-specific adsorption of OH-PAHs at the same time. In addition, online MSPE can greatly simplify the analysis process, reduce human errors and enhance the sensitivity. When compared with offline MSPE, a sensitivity enhancement of 30–400 times was obtained for the online method. Some experimental parameters such as the amount of the sorbent, sampling flow rate and sample volume, were optimized systematically. Under the optimal conditions, the limits of detection (LOD) were in the range of 0.028–0.114 ng mL −1 , and the correlation coefficients (R 2 ) were higher than 0.9962. The relative standard deviations (RSDs) were less than 16.1% (n = 5) and the recoveries ranged from 71% to 116%. The above results show that the rapid, sensitive and automated online-MSPE-HPLC-MS method has potential application in the simultaneous determination of 8-OHdG and PAHs in complex sample matrix to assess the environmental exposure level.
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PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Kuang Luo,Ao Chen,Yiting Liu,Jie Yang,Ning Cai,Jumei Li
Surface-enhanced Raman spectroscopy (SERS) has been perceived as a valuable tool in ensuring food safety due to its rapid and intuitive nature. In this study, we demonstrate a novel cellulose-ZIF-8-noble metal nanostructure as a SERS substrate for the analysis of pesticide residues in food. Cellulose nanocrystal (CNC) acting as a scaffold, we systematically integrate ZIF-8 and Ag nanoparticles to fabricate tailored necklace-like CNC/ZIF-8/Ag core/shell nanostructures. SERS analysis reveals the CNC/ZIF-8/Ag presents an high enhancement factor of 6.39 × 10 4 , a low limit of detection (LOD) of 10 −9 mol/L, and a relative standard deviation of 10.24 % across 20 substrate batches for 4-mercaptobenzoic acid, underscoring its robust sensitivity and reproducibility. Moreover, its utility extends to the quantification of diquat dibromide (DQ) in standard solutions and green tea leaves, showcasing LODs of 6.61 × 10 −9 mol/L and 6.76 × 10 −8 mol/L, respectively, thereby exhibiting promising capabilities for ultra-sensitive pesticide detection in food. The exceptional SERS property can be ascribed to the enriching properties of the porous ZIF-8 nanostructures. Significantly, when exposed to UV light, the CNC/ZIF-8/Ag nanostructures efficiently degrade DQ within 60 min. Furthermore, their practical reusability under UV light is proved by high SERS performance across five detection cycles. These results emphasize the immense potential of CNC/ZIF-8/Ag in SERS-based trace pesticide detection.
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TALANTA
·
2016
·
IF 4.035
Jie Huang,Changrong Ou,Fangying Lv,Yuting Cao,Haiqing Tang,You Zhou,Ning Gan
Some harmful aliphatic diamines, e.g., putrescine (Put) and cadaverine (Cad), play important roles in food safety evaluation. In this study, we proposed on-fiber derivatization solid-phase microextraction analysis of non-volatile aliphatic diamines in fish using zeolitic imidazolate framework 8 (ZIF-8) as a solid-phase microextraction (SPME) coating. It was employed to encapsulate isobutyl chloroformate (IBCF, 40 °C, 15 min) for aqueous extraction of Put and Cad. After that, the derivatized aliphatic amines were thermally desorbed in the GC injection port and analyzed by GC-MS. The porous and hydrophobic ZIF-8 with high surface area can increase the IBCF loading amount and prevent it from decomposing, thus increasing the amine extraction effectiveness and sensitivity. In SIM mode and using the molecular ion for quantification, the limits of detection for Put and Cad were 27.1 and 33.2 μg L −1 , respectively under the optimal conditions. The fiber-to-fiber reproducibility values (RSDs) for three ZIF-8 coated fibers were less than 11.4% for both Put and Cad. The extraction with the new fiber was reproducible for at least 30 cycles without a noticeable decrease of performance (RSD<10%). The new fiber was successfully applied to the detection of putrescine and cadaverine in several fish samples and showed good recoveries (78.6–104%).
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Ting Zhou,Luyao Zang,Junjie Sun,Xia Zhang,Zijie Qu,Xia Liu,Guodong Zhang,Xiufeng Wang,Fang Wang,Zhiqing Zhang
Considering the severe hazard to health posed by nitrophenol (NP) isomers, especially 4-NP, reliable and selective detection strategies are urgently challenged. In this study, a fluorescence platform based on glutathione-stabilized gold/silver nanoclusters (GSH-Au/Ag NCs) and zeolite imidazolate framework material (ZIF-8) was developed for 4-NP detection. The synergistic effect of gold and silver makes the bimetallic nanoclusters (GSH-Au/Ag NCs) much better in optical properties than gold nanoclusters. Subsequently, GSH-Au/Ag NCs with aggregation-induced emission (AIE) effect was encapsulated into ZIF-8 to obtain GSH-Au/Ag NCs@ZIF-8 nanocomposite. Compared with GSH-Au NCs, the fluorescence signal was efficiently further improved nearly 7 times through the confinement effect of ZIF-8, and the fluorescence lifetime was increased from 1.2 μs to 6.9 μs. The addition of 4-NP effectively quenched the fluorescence emission peak of GSH-Au/Ag NCs@ZIF-8 at 600 nm, and the assay exhibited highly sensitivity to 4-NP with the detection limit of 1.11 μM from 2.0 μM to 35 μM. Especially, results showed that 4-NP could be easily discriminated from nitrophenol isomers (3-NP and 2-NP). The mechanism research demonstrated that the absorption curve of GSH-Au/Ag NCs@ZIF-8 + 4-NP overlapped greatly with the fluorescence excitation spectrum of GSH-Au/Ag NCs@ZIF-8, and the fluorescence lifetime of GSH-Au/Ag NCs@ZIF-8 did not change when 4-NP was present or not. Therefore, the mechanism of GSH-Au/Ag NCs@ZIF-8 for 4-NP detection was mainly attributed to the inner filter effect (IFE). Furthermore, the developed detection assay was applied to water sample with satisfactory recovery results, demonstrating its high potential in monitoring 4-NP in environment.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Xiaobo Zhang,Zhiru Li,Yushu Shi,Bing Hu,Qiuyue Zheng,Yongzhe Piao,Liang Feng,Jijuan Cao
Aflatoxin B1 (AFB 1 ), a hepatotoxic and carcinogenic food contaminant, is commonly found in agricultural food. Herein, Au NPs anchored ZIF-8-derived porous carbon-ZnO (Au NPs/PC ZIF-8 -ZnO) was firstly synthesized to act as the sensing substrate. Then, a ratiometric electrochemical (EC) and “off–on” photoelectrochemical (PEC) dual-mode paper-based aptasensor was presented for AFB 1 detection based on a distance-modulation sensing strategy. The independent signal transduction mechanisms and output mode not only broaden the dynamic detection range but also provide a self-verification to assay results, improving the sensitivity and reliability. The wide detection ranges of 0.1 pg/mL-100 ng/mL (EC mode) and 0.02 pg/mL-100 ng/mL (PEC mode) were obtained using dual-mode aptasensor, with detection limits of 36.7 and 9.3 fg/mL, respectively. The fabricated aptasensor exhibited excellent selectivity, reproducibility and stability. Furthermore, it exhibited good practicability for AFB 1 assays in real samples, demonstrating great potential applications for food safety evaluation.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Xunke Zhao,Kaihuan Nie,Fuyi Sun,Cheng Xie,Yanran Cheng,Yuanyuan Che
Nanofiltration holds promise for treating dyeing and printing wastewater on account of its key merits: low consumption, easy manipulation, and absence of secondary contamination. In this study, the fabrication of a uniform permselective ZIF-8@GO composite membrane in the alumina ceramic tube by the continuous flow combined with in situ self-assembly way was investigated. Subsequently, the properties of ZIF-8@GO membrane were examined in relation to reaction time, reaction temperature, flow rate, and GO concentration. Furthermore, the durability of the membrane was tested. It was observed that under optimal conditions, the rejection rate and permeation flux of methyl blue solutions remained essentially constant during 24 hours of continuous operation, with values of 98.39% and 38.27 L/(m 2 ·h·bar), respectively. This work aims to simplify and smoothly implement the industrialized production of MOF-based composite membranes and offers a potential solution for the low-cost and efficient treatment of organic dye wastewater in the printing and dyeing industry.
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