JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Shiyang Li,Chenchen Zheng,Longdou Tu,Dajian Cai,Yangxiang Huang,Congjie Gao,Yeqiang Lu,Lixin Xue
Tight ultra-filtration (TUF) membranes were constructed by in situ growing zinc imidazole frameworks micro-crystalline leaves (ZIF-L) in polyethylene imine (PEI) and polydopamine (PDA) deposit layers on porous polyethylene (PE) substrates. The effects of preparation conditions on the surface physical and chemical structures as well as on the dye/salt separation performance of the formed TUF membranes were systematically investigated. By inserting selective water permeation channels and increasing contacting surface areas, in situ-grown ZIF-L arrays tightly cross-linked in the coating matrix greatly increased water permeation without trading off dye/salt retention selectivity. The morphology of the included ZIF-L particles could be varied by adjusting the ligand/Zn molar ratio (α) in the preparation processes. Optimized PDA-PEI/ZIF-L@PE TUF membranes containing ZIF-L of cross-cross block morphology showed very high pure water permeability of 180 ± 20 L·m −2 ·h −1 ·bar −1 (LMHB) and retention selectivity (S CR/Na2SO4 and S MB/Na2SO4 ) of 267 and 43, respectively, as well as excellent stability and anti-fouling properties.
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高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Aijuan Xie,Linghui Cao,Tianyu Shen,Yuanxinyi Zhou,Haoye Wang,Shiping Luo
As para -aminophenol (PAP) is toxic to humans, causing skin irritation, eye damage, and central nervous system depression, and it can form as a degradation product of paracetamol (PAT) under certain conditions, the simultaneous determination of PAP and PAT is crucial. This work presents the fabrication of three-dimensional ZnCo 2 O 4 @Fe 3 O 4 /MWCNTs hybrid for the simultaneous determination of PAP and PAT using ZIF-8/67@Fe 3 O 4 as precursor and MWCNTs as conductive substrate. The ZnCo 2 O 4 @Fe 3 O 4 /MWCNTs/GCE sensor exhibits linear ranges 1.0–150.0 μM with detection limits of 0.033 μM and 0.018 μM for PAP and PAT, respectively. The developed sensor was successfully used for the determination of PAP and PAT in acetaminophen tablets and lake water with satisfactory results.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Zeming Qiu,Feiyu Gao,Yuhan Zhang,Jinzhou Li,Yang You,Xuewei Lv,Jie Dang
Biomass adsorbents possess significant potential for both metal recovery from industrial leaching solutions and wastewater treatment. However, standalone biomass materials suffer from the drawback of low adsorption capacity. In this study, by the combination of metal–organic frameworks (MOFs) with organic biomaterials, a novel aerogel of aminated ZIF-8 composite cellulose (CPEZN) was developed for molybdenum ions adsorption, and the incorporation of aminated ZIF-8 improved the availability of reactive groups. The unique aerogel structure effectively prevented the accumulation of MOFs, thereby increasing the specific surface area and improving the exposure of active site. In addition, the positively charged surface of CPEZN effectively adsorbed molybdenum ions. Experimental results showed that the introduction of ZIF-8-NH 2 improved the adsorption performance of the composites. The adsorption of Mo(VI) followed the Langmuir adsorption isotherm model, and its adsorption rate followed the pseudo-second-order model. The adsorbent exhibited a maximum Mo(VI) adsorption capacity of 872.39 mg/g at pH = 3, and a removal rate of more than 80 % in mixed coexisting ion solutions. Moreover, the adsorbent demonstrated good stability, with a removal rate of above 80 % after 5 cycles of adsorption. Comprehensive characterizations revealed that the adsorption mechanism of Mo(VI) on CPEZN was a synergistic effect of chemisorption, electrostatic interaction, redox, and complex ligand processes. The simulated industrial wastewater adsorption experiment showed that the prepared adsorbent had good removal ability for molybdenum ions. This study not only provides a reference for the design and preparation of MOF and biomass-based composite adsorbent materials, particularly in terms of understanding the adsorption mechanism and designing high-capacity functional groups, but also provides a theoretical basis for its practical application.
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Polymers
·
2024
·Vol. 16
·期 23
·3351
·
IF 4.7
Ya Chen,Xueyong Qiao,Guoran Sun,Zhonghui Han,Lei Lv,Xiaolei Zhao,Jinxing He
The development of fluorescent sensors with high sensitivity and fast response times is attracting the interest of more and more researchers. Herein, dual-emission ratiometric molecularly imprinted fluorescent encoded microspheres were fabricated and applied for the fast detection of norfloxacin. Core–shell-structured imprinted polymers with ZIF-8 as the supporting core were obtained first and two quantum dots with green and red emission provided the fluorescent signal. The introduction of the optical encoding technique greatly simplified the preparation process. After the addition of NOR, the green intensity at 525 nm remained constant and the fluorescent intensity at 625 nm decreased significantly because of the inner filter effect. Under the optimum detection conditions, a good linear correlation ranged from 5 μg L−1to 500 μg L−1, and the spiked recoveries of the method were 89.76%–106.94%. The detection limit for chicken, pork, fish, and milk samples was established at 2 μg L−1. More importantly, the established sensor provided a faster mass transfer rate, and the detection process took only 15 min, indicating great potential as an alternative for the fast detection of NOR in food samples.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yuanqian Xiong,Xiaoyu Gao,Yu Wang,Xiangrui Deng,Chunhong Xiong,Jinsheng Zhang,Qianhui Gu,Ganhui Huang
Norfloxacin (NOR) is now extensively used for the treatment of human and animal diseases. Unfortunately, large accumulations of NOR will pose a significant threat to the human body. Thus, it is urgent to develop a rapid and sensitive detection technique for the trace determination of NOR. In this study, an electrochemical molecular imprinting sensor with great properties was fabricated for the determination of NOR in milk and environmental water. The incorporation of bovine serum proteins produced a hybrid recognition interface consisting of molecularly imprinted polymers and peptides that provided good recognition properties for norfloxacin. The Fe 3 O 4 @ZIF-8 was distributed orderly on the electrode after the embedding of the magnets inside the electrode, then the BSA was coated on the electrode with the electrodeposited AuNPs through Au-S bonding. The sensor constructed in this study achieved ultra-sensitive detection of norfloxacin with an effective area of 0.08433 cm 2 , a limit of detection (LOD) of 0.108 pmol·L −1 , and a wide linear range (1 ∼ 100, 100 ∼ 1000 and 1000 ∼ 8000 pmol·L −1 ). The prepared sensors exhibited satisfactory performance in the detection of milk and environmental water, with acceptable recoveries ranging from 96.24 % to 104.88 %, and the relative standard deviation (RSD) was no more than 4.84 %.
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MATERIALS CHEMISTRY AND PHYSICS
·
2024
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IF 4.3
Yugao Guo,Xueqiang Zhang,Jingwen Qiao,Menghan Guo,Xinling Bai,Ruonan Tian,Dengke Ji
In this paper, polyaniline (PANI) material was prepared by in-situ polymerization and mixed with zeolitic imidazolate frameworks (ZIF-8) to prepare PANI/ZIF-8 by surface modification. The light cured epoxy resin (RJ313) was modified by PANI/ZIF-8, and the PANI/ZIF-8/RJ313 anticorrosive coating was prepared. The chemical cross-linking of ZIF-8 with the epoxy resin can improve the cross-linking density and barrier property of the epoxy coating, thus improving the corrosion resistance of the coating. The encapsulation of PANI in ZIF-8 not only maintains the corrosion resistance of PANI, but also strengthens the dispersion of PANI under the action of ZIF-8 and improves the mechanical strength of the coating. A series of tests, such as the polarization test and electrochemical impedance test, proved that PANI/ZIF-8/RJ313 coating strongly affects 304SS acid corrosion resistance compared with RJ313, ZIF-8/RJ313 and PANI/RJ313. In 0.5 mol L −1 sulfuric acid solution, the corrosion current I corr of this coating attached to 304SS was as low as 0.0308 μA·cm −2 , and the impedance value can reach 37971.00 Ω·cm 2 . This provides a new idea for improving the dispersibility and corrosion resistance of other anti-corrosion materials.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Junge Xu,Weihao Yu,Ziwei Zhang,Fubin Deng,Shengkong Wang,Rusen Zou,Yingmu Wang,Baoling Yuan
Pollution from extensive sulfonamide antibiotic use is a critical research focus, particularly in the remediation of these antibiotics using composite materials. This study employed a CuFe 2 O 4 /ZIF-8 composite to activate sodium percarbonate (SPC) for the photo-Fenton-like degradation of the sulfonamide antibiotic sulfamethoxazole (SMX). The optimal conditions for SMX degradation were determined using the CuFe 2 O 4 /ZIF-8/SPC/Vis system: a ZIF-8 composite ratio of 40 %, catalyst dosage of 0.15 g/L, SPC concentration of 0.8 mM, and initial pH of 3.0, achieving complete SMX removal within 30 min. After five cycle tests, the leaching rates of copper and iron ions were 0.179 mg/L and 0.376 mg/L, respectively, significantly lower compared to the use of CuFe 2 O 4 alone as the catalyst (Cu: 0.46 mg/L, Fe: 1.43 mg/L). The radicals present in the system were identified, with their contribution rates ranked from highest to lowest as follows: ·OH > h + > ·O 2 – > CO 3 · - > 1 O 2 . Further mechanistic investigations revealed that the heterogeneous structures in CuFe 2 O 4 /ZIF-8 enhanced the efficiency of the photo-Fenton-like reaction by facilitating electron transfer. This study introduced an innovative approach for antibiotic treatment using the CuFe 2 O 4 /ZIF-8 composite under visible light irradiation and broadened the technical framework of SPC-based advanced oxidation processes (AOPs) for treating wastewater.
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NANOTECHNOLOGY
·
2024
·Vol. 35
·期 42
·425603
·
IF 2.9
Hao Chen,ZhaoGuo Wu,AiWu Zhao,Jin Wang
To enhance the stability of Raman reporters, these reporters were trapped in a metal organic framework (MOF) exoskeleton that was grown and compressed on Fe3O4@Au core–satellites, producing recyclable surface-enhanced Raman scattering (SERS) nanotags. Furthermore, encapsulation of Raman reporters in the assembled MOF-based nanocomposites was divided into two types of patterns, pre-enrichment and post-enrichment, in order to disentangle chemical enhancement of charge transfer (CT) from electromagnetic enhancement (EM) in SERS. Hence, to demonstrate the effect of encapsulation, a typical non-thiolated Raman reporter, for example crystal violet (CV) trapped in a core–satellite nanoassembly-based zeolitic imidazolate framework (ZIF-8) shell, was selected. The results suggest that stability and Raman intensity are remarkably improved. Moreover, the pattern of incorporation of CV into the ZIF-8 shell with tunable shell thickness can contribute to the disentangling of CT effects from EM effects.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Zikang Li,Guangyao Fan,Muning Chen,Qin Shen,Shenzhen Cong,Roberto Castro-Muñoz,Dongyang Li,Jing Wang,Yatao Zhang
By combining the advantages of polymers and porous nano-fillers, mixed matrix membranes (MMMs) have demonstrated outstanding gas separation performance. However, the ideal matching between polymers and nano-fillers is still a challenge especially under high filler loading conditions. To address this interfacial challenge, an in-situ grown amino-functionalized ZIF-8 (NH 2 -ZIF-8) is embedded in 6FDA-DAM to prepare MMMs. Compared to ZIF-8, NH 2 -ZIF-8 not only can enhance compatibility and interfacial adhesion because of the extensive hydrogen bonding, but also effectively modulates its structural flexibility by increasing the rigidity of Zn–N bonds within the ZIF-8 framework. The enhanced framework rigidity of NH 2 -ZIF-8 successfully improves the CO 2 /CH 4 separation capability of the MMMs. Under a high filler loading of 30 wt%, the CO 2 /CH 4 selectivity of the optimized NH 2 -ZIF-8/6FDA-DAM MMMs reached 35.1 and the permeability reached 1225.9 Barrer, which increased by 25.36 %, and 8.94 % respectively compared to the ZIF-8 MMMs, exceeding the 2008 Robeson upper bound. Molecular simulations further reveal the enhanced diffusion selectivity of NH 2 -ZIF-8 and the strong interactions between surface –NH 2 groups and electron-rich O/F heteroatoms in the 6FDA-DAM polyimide matrix. These simulations quantitatively elucidated the critical role of interfacial structure in determining gas separation performance. The mechanistic insights provided in this study offer valuable theoretical guidance for the development of high-performance membrane materials for CO 2 capture and gas purification applications.
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CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Dandan Yan,Min Li
The cement solidification method serves as an effective approach for the immobilization of heavy metal-containing waste. However, Cr(VI), a highly toxic substance, is inadequately stabilized and solidified within cement pastes, posing a significant risk of leaching. This study innovatively incorporated nano-porous nitrogen-doped carbon (NC), derived from ZIF-8 through carbonization, into the cement containing heavy metals for collaborative disposal mixing with K 2 CrO 4 (HMC-Cr). Subsequently, the hydration behavior, mechanical properties, and solidification mechanism of Cr(VI) in the composite cement pastes were examined. The experimental results revealed that, compared to ZIF-8, NC demonstrated significantly greater positive impacts on the hydration kinetics, compressive strength, and Cr(VI) immobilization capabilities of HMC-Cr cement. Compared with pure HMC-Cr pastes, the 28-day compressive strength of HMC-Cr/NC increased by 16.7 %, and the leaching concentration of heavy metal Cr decreased by 52.5 %. The HMC-Cr/NC pastes exhibited superior Cr(VI) solidification capacity, attributed to the appropriate pore size, excellent nucleation effect, and reduction properties of NC. The primary immobilization forms of Cr in HMC-Cr/NC pastes included CrO 4 2- -AFm, Cr(OH) 3 , and coordination structures involving C-NH. Consequently, NC nanomaterials derived from ZIF-8 serve as effective additives for enhancing the stable immobilization of Cr(VI) in the cement solidification treatment of heavy metal-containing waste.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Huanhuan Li,Yu Wu,Xorlali Nunekpeku,Yuhan Yang,Jingsa Zhao,Wei Sheng,Yuexia Wang
The increasing presence of Aflatoxin B 1 (AFB 1 ) residues in food continues to raise significant public health concerns. Herein, we designed an upconversion-based sensor integrated into an alginate-polyacrylamide (SA-PAM) hydrogel for on-site AFB 1 detection in food. First, core-shell upconversion nanoparticles (CSUCNPs) with enhanced fluorescence were modified with complementary DNA (cDNA), forming signal probes known as CSUCNPs-cDNA. Simultaneously, NH 2 -ZIF-8@Cu 2+ with a high surface area and specific affinity for aptamer was synthesized using a one-pot method. This was then modified with an AFB 1 -specific aptamer, forming the capture probe Apt-ZIF-8@Cu 2+ . Using base pairing, CSUCNPs-cDNA and Apt-ZIF-8@Cu 2+ were hybridized into sensing probes (CSUCNPs-ZIF-8@Cu 2+ ), which were embedded into SA-PAM hydrogels as stable sensor carrier. Furthermore, the SA-PAM hydrogel showed a reduced swelling ratio of 1.68–1.80 in water and phosphate buffer solution(s) (PBS), which improves stability. In the presence of AFB 1 , the aptamer selectively binds the AFB 1 , increasing electrostatic repulsion between CSUCNPs-cDNA and Apt-ZIF-8@Cu 2+ . This disrupts Förster resonance energy transfer (FRET), resulting in a pronounced “signal-on” fluorescence. This sensor achieves AFB 1 diffusion through the SA-PAM hydrogel, FRET disruption and upconversion signal stabilization within 18 min, faster than traditional methods. Under optimized conditions, the sensor exhibited a clear linear correlation between fluorescence intensity and the logarithm of AFB 1 concentration ranging from 0.1 to 100 µg/kg ( R ² = 0.994), with a detection limit as low as 0.08 µg/kg. Besides, its performance was further validated through tests on spiked wheat, corn, peanut, and water, demonstrating high accuracy and reproducibility with relative standard deviation (RSD) below 3.63 % and recoveries of 85.88–98.04 %.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 8
·1-9
·
IF 5.3
Yang Yufan,Zhao Bo,Hu Xiaopeng,Gu Huiwen,Yan Xiu-Fang,Yin Xiaoli
A dual-mode fluorescent/colorimetric sensor is presented utilizing Au/ZIF-67 nanocomposites for an ultrasensitive ochratoxin A (OTA) detection. The system employs polydopamine-coated Fe 3 O 4 nanoparticles (Fe 3 O 4 @MIP) as magnetic recognition elements and aptamer/3,3′,5,5′-tetramethylbenzidine (TMB)-functionalized Au/ZIF-67 nanocomposites (Apt/TMB/Au/ZIF-67) as dual-signal probes for both fluorescence and colorimetric detection. Through molecular imprinting-aptamer synergistic recognition, OTA binding induces the formation of sandwich-structured particles (Fe 3 O 4 @MIP-OTA-Apt/TMB/Au/ZIF-67). Magnetic separation of these particles facilitates fluorescence measurements, while residual Apt/TMB/Au/ZIF-67 in solution permits simultaneous colorimetric detection. Crucially, fluorescence intensity increases while colorimetric absorption decreases proportionally with OTA concentration (0.5–25 ng mL⁻ 1 ), enabling self-validating dual-mode detection without requiring reagent replacement. The platform achieves detection limits of 0.15 ng mL⁻ 1 (fluorescence) and 0.13 ng mL⁻ 1 (colorimetry). The sensor was successfully validated for OTA quantification in real food samples, demonstrating significant potential for food safety applications. Graphical
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