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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ACS Applied Electronic Materials
·
2025
·
IF 4.7
Jing Zhang,Zhi Song,Yao Wei,Xiaoyu Li,Xingyao Li,Yu Hua,Qingguo Ren,Xiaolin Lan,Yi Hou,Lixi Wang
The development of high-performance microwave absorbers with strong absorption intensity, broad absorption bandwidth, and thin matching thickness remains a focal point in the field of electromagnetic (EM) attenuation materials. The synergistic design and construction of microstructures based on multiple polarization and loss mechanisms represent an effective approach to achieve this objective. Metal–organic frameworks (MOFs) inherently possess both magnetic and dielectric capabilities, making them excellent templates for high-performance microwave absorbers. However, single-component MOF-derived absorbers still suffer from insufficient absorption efficiency and a narrow effective bandwidth. Herein, a 0D/1D composite optimization strategy combining both component design and microstructure engineering is proposed to enhance EM attenuation in MOF-derived absorbers. The design features a cubic dual-phase CoFe alloy to serve as a magnetic loss framework. Meanwhile, the in situ grown CNTs endow the nanocomposite with substantial conductive loss, as well as the enhancement of interfacial polarization and dipole polarization. The resultant CoFe@CNTs nanocomposite achieves a minimal reflection loss of −49.63 dB at 16.88 GHz (1.5 mm thickness) and 6.32 GHz EAB at 1.71 mm. Compared to single-component Co nanoparticles, the superior absorption performance with lower RL, wider bandwidth, and thinner thickness makes the CoFe@CNTs nanocomposite an ideal highly effective EM absorption candidate.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 10
·1-9
·
IF 5.3
Zeng Zhaobin,Wang Haibin,Cai Chongming,Xiang Lin,Zhou Haohuan,Xie Ziyi,Guo Bangming
Methods based on photoelectrochemical immunoassay have been utilized for the quantitative monitoring of neuron-specific antigen (NSE) with neuroblastoma patients, but most provide only low sensitivity. In this contribution, a simple and feasible photoelectrochemical immunoassay based on ZIF-8-derived double-shelled hollow ZnS nanocages (ZnS NCs) was applied to the split-type photocurrent measurement of NSE in biological fluids, accompanied by an enzyme-catalyzed system for synergistic amplification. Glucose oxidase (GOx)-labeled anti-NSE secondary antibody was utilized to form a sandwiched immunoreaction on capture antibody-coated microplate, whereas ZnS NCs with strong and stable photocurrents were employed to generate the detectable photocurrent. Subsequently, GOx catalyzed the glucose substrate to produce hydrogen peroxide, thereby causing the change in the photocurrent of double-shelled hollow ZnS nanocages. Followed by optimizing experimental conditions, the photoelectrochemical immunoassay displayed good photocurrent responses within the dynamic range 1.0–10000 pg mL −1 at a low detection limit of 0.59 pg mL −1 NSE. Good reproducibility and high specificity were acquired for determination of NSE standards. Such a highly favourable analytical performance could be achieved even in human serum samples at different dilutions.
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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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Membranes
·
2025
·Vol. 15
·期 9
·277
·
IF 3.6
Lei Ni,Qiancheng Cui,Zhe Wang,Xueting Zhang,Jun Ma,Wenjuan Zhang,Caihong Liu
The inherent hydrophobicity of poly(vinylidene fluoride) (PVDF) ultrafiltration membranes leads to severe membrane fouling when processing proteinaceous solutions and organic contaminants, significantly limiting their practical applications. This study presents a novel metal-ion mediated co-deposition strategy for fabricating high-performance antifouling poly(vinylidene fluoride) (PVDF) hollow fiber ultrafiltration membranes. Through Zn2+coordination-driven self-assembly, a uniform and stable composite coating of dopamine (DA), tannic acid (TA), and ZIF-8 nanoparticles was successfully constructed on the membrane surface under mild conditions. The modified membrane exhibited significantly enhanced hydrophilicity, with a water contact angle of 21° and zeta potential of −29.68 mV, facilitating the formation of a dense hydration layer that effectively prevented protein adhesion. The membrane demonstrated exceptional separation performance, achieving a pure water permeability of 771 L/(m2∙h∙bar) and bovine serum albumin (BSA) rejection of 97.7%. Furthermore, it showed outstanding antifouling capability with flux recovery rates exceeding 83.6%, 74.7%, and 71.5% after fouling by BSA, lysozyme, and ovalbumin, respectively. xDLVO analysis revealed substantially increased interfacial free energy and stronger repulsive interactions between the modified surface and protein foulants. The antifouling mechanism was attributed to the synergistic effects of hydration layer formation, optimized pore structure, additional water transport pathways from ZIF-8 incorporation, and electrostatic repulsion from negatively charged surface groups. This work provides valuable insights into the rational design of high-performance antifouling membranes for sustainable water treatment and protein separation applications.
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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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Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-28
·
IF 36.3
Shi Tao,Gao Xing,Liu Huan,Wang Xiaodong
A “five-in-one” multifunctional phase-change composite is developed for magnetothermal, electrothermal, solar-thermal, and thermoelectric energy conversion and electromagnetic shielding applications.
The developed composite is based on an innovative combination of carbonized polyimide/Kevlar/graphene oxide@ZIF-67 complex aerogel as a supporting material and paraffin wax as a phase-change material.
The developed composite exhibits excellent solar-thermal, thermoelectric, electrothermal, and magnetothermal energy conversion performance along with high electromagnetic interference shielding effectiveness.
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MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Summaira Saghir,Zhenggang Xiao
ZIF-8 nanoparticles were prepared through the simple and facile method at room temperature and subsequently applied for the simultaneous adsorption of two antibiotics, tetracycline (TC) and minocycline (MC). The prepared ZIF-8 exhibits regular rhombic dodecahedron having meso and macropores structure with a specific surface area of 1516.06 (m²/g), indicating that ZIF-8 could be an ideal adsorbent material for the adsorption of antibiotics. Moreover, the adsorption conditions were optimized in detail. All the characterizations of ZIF-8 after adsorption reveal the successful adsorption of TC and MC on ZIF-8. The adsorption kinetics and isothermal data of both antibiotics fitted well with the pseudo second order and Langmuir isotherm model. The adsorption behaviour of TC and MC on ZIF-8 was based mainly on electrostatics and π - π stacking interactions. This study revealed that ZIF-8 could be used as a useful adsorbent in treating wastewater contaminated with multiple antibiotics.
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APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Kunpeng Song,Wen Dong,Cheng Tang,Zhijuan Zou,Yundang Wu
In this study, a novel and highly efficient ORR catalyst is designed via the pyrolysis of zeolitic imidazole framework-8 (ZIF-8) under the protection of hypercrosslinked iron porphyrins . Fe 3 O 4 nanoparticles with oxygen vacancies are formed in situ and promoting catalytic efficiency. Benefiting from the synergistic effect among the Fe 3 O 4 and ZIF-8 skeleton, the hybrid catalyst exhibits excellent ORR activity even surpassing commercial Pt/C. The pyrolyzation temperature is studied in detail and determined to be a crucial parameter for ORR performance. Nano-Fe 3 O 4 , which has high catalytic efficiency, is formed in situ at 800 ℃. Amorphous iron is formed at 600 ℃ and 700 ℃, and zero-valent iron is formed at 900 ℃. The content of oxygen vacancies, Fe–N, and graphite–N, which are beneficial to the ORR reaction, are all reached to a maximum at 800 ℃. This study provides a new approach to design highly active Fe 3 O 4 -based electrocatalytic materials.
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Chemical Science
·
2018
·Vol. 9
·期 21
·4746-4755
·
IF 9.063
Congfang Chen,Aiping Wu,Haijing Yan,Yinglu Xiao,Chungui Tian,Honggang Fu
Bi-transition metal carbides (BTMCs) are promising in catalytic fields, but the synthesis of small-sized BTMCs remains a challenge. Here, MoxCoxC (mainly below 20 nm in size) confined in uniform carbon polyhedrons (MoxCoxC@C) was synthesized based on trapping [PMo12O40]3− (PMo12) clusters into pre-synthesized, uniform ZIF-67 (PMo/ZIF-67). The opening of the windows (0.34 nm) of ZIF-67 cages through heating is essential to allow the trapping of PMo12 into the cages. This trapping route provides a new method to successfully combine POMs and MOFs that can not be effectively combined via traditional POMOF-based (simultaneous assembly) routes. It also has advantages in controlling the uniformity and components of the materials. The size matching of PMo12 (1 nm) and the cages (1.16 nm) of ZIF-67 enables effective contact of the Co and Mo sources, thus giving small-sized MoxCoxC protected by carbon via calcination. The optimized catalysts showed good performance for water splitting with a low η10 of 83 mV (295 mV) for the hydrogen (oxygen) evolution reaction, which is superior to those derived from ZIF-67 and precursors from POMOF-based routes. Our results also indicated that the HER activity is determined by the kind of BTMC, and the activity for the OER is relative to the oxygen-containing species formed during the initial OER test.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yarong Bai,Junping Dong,Yaqin Hou,Yaoping Guo,Yongjin Liu,Yulin Li,Xiaojin Han,Zhanggen Huang
Herein, a series of Co 3 O 4 nanoparticles inlaid in porous carbon (CoO x @PC-T) were successfully prepared via first pyrolysis of ZIF-67 in argon atmosphere at different temperature and then oxidized in 5% O 2 /Ar mixed gas. The as-made samples were employed as catalysts for selective catalytic reduction of NO x with NH 3 at low temperature (100 °C–200 °C). The effect of pyrolysis temperature on the microstructure, textural properties, and chemical properties of CoO x @PC-T were characterized by TG-MS, BET, XRD, SEM, TEM, H 2 -TPR and XPS in detail. Results show that the pyrolysis temperature has a significant effect on the carbonization degree of carbon in ZIF-67, and which in turn affects the exposure and oxidization of cobalt nanoparticles on the catalyst surface. Experiments results show that CoO x @PC-800 display the highest NO x conversion ratio, which is attributed to its higher ratio of Co 3+ /Co 2+ and large specific surface area. Moreover, the stability, H 2 O and SO 2 resistance of CoO x @PC-800 were also studied.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Weibin Bai,Xu Zhang,Zhencheng He,Yao Qian,Rongkun Jian,Yucai Lin,Yanlian Xu
The incalculable metal corrosion loss makes the research of long-term corrosion resistant coatings attract much attention. Herein, we demonstrated a new strategy for constructing a pH-responsive nanocontainer as a gatekeeper, which consisted of a laminated double hydroxide (LDH) surface in situ grown ZIF-8 containing the corrosion inhibitor of 2-mercaptobenzimidazole (MBM). The shell-core structures of the composite fillers displayed the excellent barrier performance and pH-responsive controlled release properties in epoxy (EP) coatings. Electrochemical impedance spectroscopy and salt spray tests were conducted to investigate the multifunctional role in providing an intelligent anti-corrosion MBM@ZIF-8@LDH/EP composite coating . After immersing in salt solution (3.5 wt%) for 30 days, the impedance value of the MBM@ZIF-8@LDH/EP coating at 0.01 Hz (|Z| 0.01 Hz ) was 2.82 × 10 8 Ω∙cm 2 , which was about four orders of magnitude higher than that of the epoxy coating (1.54 × 10 4 Ω∙cm 2 ). The outstanding corrosion protection of MBM@ZIF-8@LDH was attributed to not only the compactness improvement of the composite coating, but also the anion exchange capability to act as a storage station for chloride ions. Meanwhile, the active filler could be used as a pH-responsive nanocontainer to release the loaded corrosion inhibitor of MBM and prevented further damage to the steel substrate, displaying a self-healing behavior. This strategy provides a new idea to combine perfect barrier effect and active anti-corrosion performance to prepare high-performance anti-corrosion and self-healing coatings. The multi-protective smart anti-corrosive coating would be a candidate with excellent performance for use in a variety of fields.
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