TALANTA
·
2024
·
IF 5.6
Bin Yang,Jia Liu,Xin Liu,Shiyue Niu,Fengming Zhang,Yuting Wang,Daqian Song,Shuyun Bi
The high efficient surface-enhanced Raman scatterring (SERS) methods to detect thiacloprid and imidacloprid were established using ZIF-8-wrapped Ag nanoparticles (AgNPs) modified with β -cyclodextrin ( β -CD). The substrate of ZIF-8/ β -CD@AgNPs was characterized by ultraviolet visible spectra (UV–vis), thermogravimetric analysis (TGA), X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). The interaction between the substrate and thiacloprid/imidacloprid was also explored. The optimum measurement conditions were obtained by response surface model based on single-factor experiments. Enhancement factors (EFs) of thiacloprid and imidacloprid were respectively 2.29 × 10 6 and 2.60 × 10 6 . A good linearity between the scattering intensity and the concentration of thiacloprid/imidacloprid within 3–1000 nmol L −1 /6–400 nmol L −1 was established. The interference experiments indicated that the methods had good selectivity . The SERS methods were successfully applied to detect thiacloprid and imidacloprid in several vegetables samples. The recoveries ranged from 95.5 % to 105 % (n = 5). The detection limits (LODs) (S/N = 3) for thiacloprid and imidacloprid were 1.50 and 0.83 nmol L −1 , respectively.
研究领域:
分析化学
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环境科学
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食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Xu Meng,Chengzhi Song,Zhenglong Xing,Manuel J. Lis Arias,Junfeng Yan,Qiang Ren,Yanli Xiang,Liping Liang
An efficient hydrophobic and lipophilic cotton fabric was designed for oil/water separation. ZIF-8 (zeolitic imidazolate framework-8) nanocrystals were synthesized and subsequently uniformly mixed with a GO (graphene oxide) dispersion, and then the cotton fabric was immersed in a pre-crosslinked PDMS (polydimethylsiloxane) solution and the mixture of ZIF-8 and GO to form rough and dense surface morphology and to achieve hydrophobic modification. Its surface morphologies, chemical structures , contact angles, and oil/water separation performances were characterized. The ability of prepared fabric with a separation efficiency was better than 95 % on average for various types of oil/water mixtures demonstrated the hydrophobic/oleophilic property, meanwhile, demonstrated a noteworthy degree of durability. It holds significant practical implications for the development of environmentally friendly and highly efficient materials for oil/water separation.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 21
·3213-3224
·
IF 8.683
Wenfang Miao,Feirong Huang,Xiaochen Shen,Shaopeng Li,Xingru Cao,Xuefeng Zhang,Jieyi Yu,Xinglong Dong
The development of high-efficiency, stable, and low-cost Fe–N–C electrocatalysts for the oxygen reduction reaction (ORR) has attracted considerable attention. Herein, a stable atomically dispersed Fe–Nx-based catalyst was synthesized from a hierarchical structure involving carbon nanofiber (CNF)-supported zeolitic-imidazolate-framework-8 (ZIF-8) encapsulated Fe–Phen complex ((Fe,N)-ZIF-8/CNFs). The Fe–Nx–CNFs obtained from the pyrolysis of (Fe,N)-ZIF-8/CNFs showed a good hierarchical multi-layer structure. The natural network structure of the carbon nanofibers serves as a matrix to uniformly distribute the ZIF-8 particles, and the Fe–Nx sites derived from the Fe–Phen complex were uniformly distributed in ZIF-8 particles. It exhibits excellent ORR performance with a high half-wave potential of 0.875 V (vs. RHE), which was 55 mV higher than that of the commercial Pt/C catalyst. In addition, density functional theory (DFT) calculations on the catalyst further revealed the origin of the ORR activity via a 4e− pathway from the precise local coordination of FeN4 sites.
研究领域:
材料科学
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电化学
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催化化学
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纳米技术
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能源化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
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.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
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.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Bin Guan,Junyan Chen,Lei Zhu,Zhongqi Zhuang,Xuehan Hu,Chenyu Zhu,Sikai Zhao,Kaiyou Shu,Hongtao Dang,Junjie Gao,Luyang Zhang,Tiankui Zhu,Wenbo Zeng,Minfan Qian,Zhangtong Li,Yang Lu,Shuai Chen,Zhen Huang
Herein, a detailed study of ZIF-8 CO2 photo-reduction catalysts was carried out, focusing on the characterization of the physicochemical properties of the materials, the photo-catalytic performance and the reaction mechanism. Through the systematic characterization of the ZIF-8 catalyst samples, the differences in the crystal structure, morphological features, specific surface area and optical properties of the materials were investigated. In addition, the catalytic mechanism of the catalysts was investigated in detail by in situ DRIFTS and DFT calculations, and the following conclusions were obtained: among the ZIF-8 catalysts prepared with different ratios of metal centers and ligand precursors, ZIF-8 (8-1) has a more obvious crystalline structure, stronger photoelectron transfer ability (τavg = 2.47 ns), and larger specific surface area (1180.33 m2 g−1), thus possessing the optimal catalytic activity, with a CO generation rate of 1.14 μmol g−1 h−1 and a CH4 generation rate of 0.62 μmol g−1 h−1, and the selectivity of CH4 was 35.28%. The band gap width of the material can be controlled by modulating the content of Zn metal ion centers to promote the photogenerated charge transfer during CO2 adsorption reduction, which corresponds to the enhancement of catalyst activity. The deep-rooted mechanism of CO2 catalytic reduction was revealed, and *COOH and *CHO as the key rapid-control steps of the CO2 catalytic reduction reaction; the energy barrier magnitude of the former (1.56 eV) controlled the reaction product yields, while the energy barrier magnitude of the latter (1.06 eV) was the key to regulate the product selectivity.
研究领域:
材料科学
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催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Yingru Huang,Jiarui Ren,Yufeng He,Xiangbin Sun,Zhiyan Ma,Rongmin Wang
The overused of antibiotics had led to major environmental issues and drug-resistant bacteria, which inevitably harmed the environment and public health. In this work, in order to obtain environmentally friendly bi-functional materials to combat with residual antibiotics and bacterial contamination, ZIF-8, a typical Zn based zeolitic imidazolate framework (ZnZIF) with excellent chemical stability, was conjugated to hydroxyapatite nanowire bundles (HAnBs) by a simple in-situ synthesis. The obtained ZnZIFs@HAnBs was characterized by SEM, EDS, XPS, FT-IR, XRD and BET. The effects of catalysts, catalyst dosage, TC initial concentration, PMS concentration and pH on TC degradation were investigated. Notably, ZnZIFs@HAnBs (94.0%) exhibited excellent degradation effect of tetracycline (TC) within 15 min, which was 1.7 and 5.2 times than that of ZIF-8 (55.9%) and HAnBs (18.1%) under optimal conditions, respectively. Moreover, after recycling 10 times, the degradation rate still more than 86.8%. The degradation mechanism was confirmed by free radical quenching experiment coupling with electron paramagnetic resonance (EPR), and the 1 O 2 and O 2 •- were the major reactive oxygen species in TC degradation. Furthermore, it presented excellent antibacterial activity (95.0%) against E. coli and S. aureus , which was attributed to the synergistic effect of sustained release of Zn 2+ and phosphate in ZnZIF@HAnBs. In summary, an eco-friendly bi-functional materials of HA nanowire bundles could be synthesized by simple strategy, and it could be applied in the fields of environmental remediation, as well as in treatment of antibiotic and bacterial pollution.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 47
·e56261
·
IF 2.7
Jiayu Lin,Yongbo Hou,Lailong Ding,Yifan Wang,Jinhu Hu,Xishun Qiu,Chao Wu,Mingliang Ma,Wei Gao
Metal–organic frameworks (MOFs) have garnered significant attention in recent years due to their potential application in flame-retardant polymeric materials. In this work, Fe 2 O 3 /ZnFe 2 O 4 /g-C 3 N 4 @ZIF-8 flame retardants were synthesized via solvothermal and calcination techniques, and their elemental composition and morphologies were thoroughly characterized. The flame retardancy of polyurea (PUA) composites incorporating varying dosages of these flame retardants was evaluated using cone calorimetry tests (CCT). The findings demonstrate that the incorporation of Fe 2 O 3 /ZnFe 2 O 4 /g-C 3 N 4 @ZIF-8 significantly enhanced the flame retardant properties of PUA composites. With the addition of 3 wt% of the flame retardant, the peak heat release rate (PHRR), total heat release (THR), total smoke production (TSP), and total CO yield (TCO) of the PUA composites decreased to 890.82 kW/m 2 , 131.34 MJ/m 2 , 12.30 m 2 , and 2.39 g, respectively, reflecting reductions of 33.59%, 18.59%, 29.40%, and 47.93% compared with pure PUA. The flame-retardant mechanism was systematically analyzed in both the condensed and gas phases. This study provides a robust experimental foundation and novel insights that contribute to the development of advanced flame-retardant coating materials.
研究领域:
材料科学
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阻燃技术
·
聚合物工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Chuanqi Zhang,Xiaomei Cheng,Ruirui Zhao,Mengxian Fu,Meifang Wang,Zhiming Chen,Changfang Zhang,Xiangzi Li
The integration of metal–organic framework (MOF) materials with magnetic cores not only serves as an effective adsorbent but also facilitates the recovery post-adsorption. In this study, we synthesized Ni@ZIF-8 composite nanotubes by introducing ZIF-8 onto the surface of Ni nanotubes, which were used as adsorbents for antibiotic removal. The Ni@ZIF-8 composite nanotubes exhibited high-efficiency and recyclable antibiotic adsorption, with the maximum adsorption capacities for tetracycline (TC) and cefixime (CFX) reaching 770.2 and 428.2 mg·g −1 , respectively. The Ni nanotubes, acting as magnetic cores, facilitated magnetic recovery after adsorption. Furthermore, the introduction of ZIF-8 not only increased the surface roughness of the composite but also incorporated a significant number of functional groups. The pseudo-second-order model, Langmuir model and intra-particle diffusion models provided better fits to the isotherm and kinetic data of the two antibiotics. Density functional theory (DFT) calculations results indicate that the π-π interactions dominate the adsorption process of both TC and CFX onto ZIF-8. And the electrostatic potential (ESP) calculations and interaction analysis indicate that the Ni atom enhances the adsorption behavior through π-π interactions between the benzene ring or carbonyl group of the two antibiotics and the imidazole of ZIF-8. This research offers a novel approach for the removal of antibiotics from contaminated water and environmental remediation using magnetic core-MOF composite materials.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2014
·
IF 4.908
Manquan Fang,Chilung Wu,Zhengjin Yang,Tao Wang,Yang Xia,Jiding Li
In this contribution, zeolitic imidazolate framework (ZIF-8)/polydimethylsiloxane (PDMS) mixed matrix membranes (MMMs) were prepared for hydrocarbon recovery using propane/nitrogen mixture as a model feed gas pair. All MMMs obtained a homogeneous particle dispersion and intimate interface interaction, which were confirmed by high resolution scanning electric microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) mapping. Gas permeation test shows that ZIF-8/PDMS MMMs demonstrate an enhanced separation performance with improved separation selectivity (38% higher than that of pure PDMS membranes) and propane permeance over 100 GPU. However, it is worth noting that the enhanced selectivity and decreased permeance of MMMs contradict the prediction by Maxwell model, which suggests the existence of pore blockage and inhibited chain mobility at polymer-particle interface. The inhibited chain mobility is further confirmed by differential scanning calorimetry (DSC) analysis. Based on these observations, a new modified Maxwell model is proposed taking non-ideal interface morphology and particle agglomeration into consideration. Both the selectivity and gas permeance predicted by the proposed model are in good agreement with experimental data, which thereby extends the application scope of original Maxwell model.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2013
·
IF 2.98
Tong Zhang,Xiongfu Zhang,Xinjuan Yan,Lu Lin,Haiou Liu,Jieshan Qiu,King Lun Yeung
A well-designed Pd/ZSM-5@ZIF-8 core–shell structure has been prepared by application of a combination of seed-induction synthesis strategy and self-assembly synthesis techniques. First, uniform ZSM-5 particles with micron size and high crystallinity were prepared from organic-template-free gel systems containing 200 nm ZSM-5 seeds and exchanged with Pd(NO 3 ) 2 aqueous solution. Then incompatibility between the Pd/ZSM-5 core material and ZIF-8 shell precursor was circumvented by surface modification using a layer by layer self-assembly of polyelectrolyte, followed by a subsequent two-step temperature synthesis process inducing the formation of continuous and well-intergrown ZIF-8 shell. Thickness of ZIF-8 shell can be simply tuned by monitoring the assembly cycles. Furthermore, hydrogenations of 1-hexene and cyclohexene were chosen as model reactions to evaluate the catalytic behavior of the Pd/ZSM-5@ZIF-8 core–shell architecture and tert-dodecylthiol was used as a poison to test its anti-poisoning ability. Results show that such core–shell architecture exhibits excellent poison resistance and selectivity control properties for the hydrogenation reactions and can be potentially used as a membrane reactor in the field of heterogeneous catalysis.
研究领域:
化学工程
·
催化科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hanhan Lv,Daniel K. Macharia,Zixiao Liu,Lisha Zhang,Chiyan Yu,Chihao Lu,Huansheng Liu,Yumei Zhang,Zhigang Chen
Photothermal catalysis has attracted increasing attention due to the efficient utilization of sustainable solar energy and high catalytic activity. However, its practical application is still limited due to the complex synthesis and low surface area of photothermal materials, as well as the challenges of distinguishing the effects of hot electrons and localized heating. To solve these issues, ZIF-8 derived porous carbon (ZPC) nanocrystals were constructed as high surface area photothermal materials and then decorated with Au nanoparticles as the catalytic components. Au/ZPC nanocomposites are prepared by the assembly of ZIF-8, the pyrolysis and in-situ Au reduction process. They are composed of rhombic dodecahedron-shaped ZPC with an average diameter of ∼120 nm, where Au nanoparticles (2–8 nm) are dispersed well on the surface or within the pore structure of ZPC . Besides, Au/ZPC exhibits a wide range of light absorption between 200 and 1100 nm and high photothermal efficiency of 45 %. With 4-nitrophenol (4-NP) reduction reaction as a model system, Au/ZPC catalyst exhibits a 2-fold increase in the rate of 4-NP reduction when exposed to an 808 nm laser irradiation, in comparison to thermocatalysis at the same temperature. Furthermore, the activation energy for the reduction of 4-NP via photothermal catalysis was much lower than that of thermocatalysis (74.16 vs. 104.26 kJ mol −1 ). By excluding hot electrons effects by transient absorption (TA) spectra, we can establish that the increase of photothermal catalysis rate should result from the localized heating which can decrease the energy barriers for the reduction of 4-NP. Additionally, Au/ZPC displays high stability and maintains remarkable activity even after five cycles. This study may provide some new perspectives for the design and development of efficient photothermal catalysts.
研究领域:
材料科学
·
催化化学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）