APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Xiaohui Ren,Ming Jin,Xiaoxiang Feng,Xin Li,Yuhong Zhou
The performance of surface-enhanced Raman scattering (SERS) active substrates highly depends on its structure and components. Herein, for the first time, a novel zeolitic imidazolate framework-8 (ZIF-8)/Ag nanoparticles composite with flower-like architecture is demonstrated. By using tannic acid as structure-directing agent, well-controlled flower-like ZIF-8 could be obtained. Through in-situ reduction, Ag nanoparticles with uniform grain distribution were directly grown on the surface of ZIF-8 nanosheets. The synergy effects of preconcentration and plasmonic hot spot allow the picomolar detections and high reproducibility of the SERS method. As a result, the minimum detection limit of rhodamine 6G can be as 10 −14 mol L −1 and the stability and repeatability are satisfactory. This work provides a facile and general method to develop plasmonic ZIF-8 hybrid with controlled morphology for potential applications in bioanalysis, chemical sensing and catalysis.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Jingjing He,Yu Wan,Wenjun Zhou
Developing high-efficient hybrids carbon catalysts for PMS-based advanced oxidation process (AOPs) are crucial in the field of environmental remediation. In this work, novel carbon nanocubes (xFe‒N‒C) with three-dimensional porous structure and abundant well-dispersed FeN x sites were obtained via a skillful cage-encapsulated-precursor pyrolysis strategy. The as-synthesized xFe‒N‒C exhibited superb activity for phenol degradation by activating peroxymonosulfate (PMS). Besides, the catalytic system not only possessed good recycling performance, wide pH adaptation and relatively low activation energy, but also had high resistance to environmental interference. Singlet oxygen ( 1 O 2 ) dominated non-radical process was responsible for phenol degradation rather than traditional radical pathways. Impressively, the doping level of Fe could regulate FeN x contents in catalysts, and the catalytic activity of xFe‒N‒C was greatly enhanced with increasing FeN x contents. Based on density functional theory calculations (DFT), the introduction of FeN x sites regulated the electronic structure of catalysts. Such electron-deficient Fe center acted as electron acceptor to receive electrons transmitted by the adsorbed PMS , thus generating highly reactive 1 O 2 for rapid phenol oxidation. This work provides a new insight into the innovation in transition metal-nitrogen hybrid carbon catalysts and highlights the pivotal roles of FeN x sites in 1 O 2 generation during PMS activation process.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Jia Wen,Xiaohong Hu
Recently, the developments of MOFs and their applications on heavy metal removal have attracted much attention. In this paper, we focused on the influence of co-existing ions on the adsorbability of epigallocatechin gallate (EGCG) modified ZIF-8 in a multi-metal system (Cd(II), Cu(II), Ni(II), and Cr(VI)). It was found that the adsorption of Cd(II), Cu(II), Ni(II), and Cr(VI) on the ZIF-8-EGCG fitted well with the pseudo second-order kinetic model and Langmuir isotherm. The adsorption selectivity of ZIF-8-EGCG in the mixed metal solution followed the order of Cu(II) ≫ Cr(VI) > Cd(II) > Ni(II). Besides, Cu(II) was the most attractive substance with a maximum capacity of 232.97 mg·g −1 . Copper also disturbed the adsorption of Cd(II) and Ni(II) and contributed the most to the Cr(VI) removal. The natural anions (e.g., Cl − , NO 3 – , AsO 2 − , SO 4 2− ) significantly impeded Cr(VI) adsorption, while low concentrations of natural cations (e.g., K + , Na + , Ca 2+ , and Mg 2+ ) facilitated the adsorption of Cd(II), Cu(II) and Ni(II).
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JOURNAL OF SOLID STATE CHEMISTRY
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2020
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IF 2.726
Xiaofen Wang,Jiang Ma,Xirui Lu,Zhiwei Fang,Lingshuang Li,Linyan Li,Yushan Yang
Hollandite ceramics are considered as a promising host matrix for cesium immobilization. In the paper, [Cs x Ba y ][Fe 3+ 2 y + x Ti 4+ 8-2 y - x ]O 16 (0.3 ≤ x , y ≤ 0.75) ceramics were synthesized by solid-state reaction method using 133 Cs and 133 Ba as the substitutes for radioactive Cs and its daughter product Ba. It was found that the as-prepared (Cs,Ba)-hollandite solid solution shows a tetragonal structure ( I 4/m) with >90% crystallinity and good Cs retention at 1250 °C. Moreover, the normalized release rates of Cs and Ba are in the order of 10 −3 g m −2 d −1 for 28 days, exhibiting excellent aqueous durability.
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RSC Advances
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2019
·Vol. 9
·期 67
·39272-39281
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IF 3.049
Xiaodong Huang,Yanan Liu,Huifang Liu,Guangyang Liu,Xiaomin Xu,Lingyun Li,Jun Lv,Haixiang Gao,Donghui Xu
A simple, sensitive, and reliable magnetic solid-phase extraction (SPE) method coupled with GC-MS/MS for the effective analysis of four pyrethroids from tea infusions was developed. A magnetic adsorbent, named ionic liquid-modified magnetic zeolitic imidazolate framework-8 (Fe3O4/ZIF-8/IL), was prepared by immobilizing an ionic liquid (IL) on the surface of Fe3O4/ZIF-8. The textures of Fe3O4/ZIF-8/IL were confirmed by material characterization, and the results suggested that the adsorbent possessed high magnetism (59.0 emu g−1), an adequate Brunauer–Emmett–Teller (BET) surface area (104 m2 g−1), and a large pore volume (0.68 cm3 g−1). To confirm the extraction performance of the prepared Fe3O4/ZIF-8/IL, several experimental conditions affecting the extraction efficiency were investigated. Under the optimum conditions, the limits of determination (LODs) for the four pyrethroids were in the range of 0.0065–0.1017 μg L−1 (S/N = 3 : 1) with an intra-day relative standard deviation (RSD) of ≤9.70% and inter-day RSD of ≤11.95%. The linear ranges were 0.5–50 μg L−1 for bifenthrin and 0.5–500 μg L−1 for permethrin, cypermethrin, and flucythrinate, with determination coefficients higher than 0.999. Finally, the proposed technique was successfully applied for the determination of pyrethroids in real tea infusions. This work could be extended to other IL-modified metal–organic frameworks (MOFs) and to the development of different sample pretreatment techniques.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2018
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IF 1.712
Na Zhou,Yan Du,Chunyu Wang,Rizhi Chen
The state-of-the-art approaches for adjusting the structural characteristics of porous carbons are the after-treatments, which are complicated and time consuming. In this work, a facile approach was developed, i.e. , controlling the initial oxygen concentration in-situ during the direct carbonization of zeolitic imidazole framework-8 (ZIF-8), to adjust the pore structure and prepare hierarchically porous carbons. The introduction of oxygen can significantly affect the crystalline and pore structures of porous carbons, and promote the pore widening and the formation of mesopores . An appropriate initial oxygen concentration can notably enhance the surface area and mesopore volume of porous carbon, and then improve the adsorption capacity toward methylene blue (MB) dye from water by 3.4 times. The developed approach is more efficient at lower carbonization temperature. Moreover, the introduction of oxygen can increase the ratio of HO C O groups on the carbon surface, leading to enhanced interaction with MB molecules and higher adsorption capacity toward MB. The as-prepared porous carbons exhibit superior adsorption capacities toward MB dye as compared to the reported ZIF-8 derived carbons. These findings would aid the development of porous carbon materials with high performance.
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Inorganic Chemistry Frontiers
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2018
·Vol. 5
·期 8
·1787-1794
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IF 5.106
Yanna Chen,Min Zhang,Cong Hu,Zhihua Yang,Shilie Pan
As the first reported examples of borates in the Zn–Sc–B–O system, Ba2ZnSc(BO3)3 and Ba4Zn5Sc2(BO3)8 were synthesized through a high-temperature solution method. The structure of Ba2ZnSc(BO3)3 can be described as ZnO4 tetrahedra connecting ScO6 octahedra to form a [ZnScO9]13− dimer, which further bonds with seven BO3 triangles to form a 2∞[ZnSc(BO3)3] layer, and the Ba atoms distribute in the voids between the layers. In contrast, in Ba4Zn5Sc2(BO3)8, Zn–O chains composed of 4- and 6-coordinated Zn atoms link with Sc2O8 dimers to form a Zn–Sc–O layer, and the BO3 triangles and Ba atoms fill in the voids between the layers. Interestingly, the special [Zn2(BO3)6]14− cluster is found in Ba2ZnSc(BO3)3, which is different from the 2D layers or 3D frameworks of the Zn–B–O configurations in other zincoborates. Moreover, the lowest-coordinated ScO5 polyhedra, as well as the coexistence of two types of ZnOn units (n = 4 and 6), are observed for the first time in Ba4Zn5Sc2(BO3)8. These fascinating results can promote the design of novel borates with BO3 units and enrich the borate structure chemistry.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Jianxin Liu,Rui Li,Yingyuan Hu,Tan Li,Zehui Jia,Yunfang Wang,Yawen Wang,Xiaochao Zhang,Caimei Fan
An Ag@AgCl/Ag nanofilm/ZIF-8 composite photocatalyst was successfully constructed for the first time by loading Ag@AgCl and Ag nanofilm on the surface of ZIF-8 simultaneously via a simple deposition-photoreduction method. The formed Ag nanofilm was harnessed as a mediator to transfer photo-induced electrons from the plasmonic Ag@AgCl nanostructure to ZIF-8 for enhancing the photocatalytic reaction rate with visible light. The photocatalytic activity was evaluated by photocatalytic degradation of methylene blue (MB) under visible light irradiation. The first-order kinetic constant of MB degradation over Ag@AgCl/Ag nanofilm/ZIF-8 (14.762 h −1 ) was nearly 2 times of Ag@AgCl/ZIF-8 (7.932 h −1 ). The electrochemical impedance spectra, photoelectric conversion spectra and ESR DMPO-O 2 − species spectra revealed that AFZ had a lower resistance, higher photocurrent density and more generation of superoxide radical than those of AZ, meaning that the extended interface between Ag nanofilm and ZIF-8 could promote the quick electrons transfer and electron-hole pairs separation. This work provides a new type electrons transfer mediator in fabrication of efficient plasmonic photocatalysts.
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ACS Applied Materials & Interfaces
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2016
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IF 7.145
Juan Yang,Huili Ye,Faqiong Zhao,Baizhao Zeng
A novel core–shell heterostructure of CuxO nanoparticles@zeolitic imidazolate framework (CuxO NPs@ZIF-8) was successfully prepared through facile pyrolysis of a nanocrystalline copper-based metal–organic framework [nHKUST-1, i.e., Cu3(BTC)2 (BTC = 1,3,5-benzene-tricarboxylate)]@ZIF-8, based on the different thermal stability of the two metal–organic frameworks (MOFs). The small CuxO NPs derived from nHKUST-1 were uniformly dispersed inside the host material and provided active sites, while ZIF-8 kept the original structure as the molecular sieving shell. Owing to the proper pore shape and pore size of ZIF-8, H2O2 could diffuse through the shell, but bigger molecules could not pass. Thus, the composite material exhibited high selectivity when it was used to construct a H2O2 sensor. In addition, the sensor showed an extended linear detection range (from 1.5 to 21442 μM), low detection limit (0.15 μM), and high sensitivity, due to the good electrocatalysis of CuxO NPs and the synergistic effect of the core–shell structure.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Yunxiang Bai,Xinxue Qiu,Deqiang Chen,Junwei Zheng,Liangliang Dong,Chunfang Zhang
Magnetic mixed matrix membranes (MMMs) show great potential for enhancing O 2 /N 2 separation efficiency by leveraging the inherent magnetic property differences between O 2 (paramagnetic) and N 2 (diamagnetic). However, one of the major challenges is the establishment and precise control of magnetic channels between magnetic fillers and polymer matrix. To address this issue, herein, ZIF-8 wrapped Fe 3 O 4 nanoparticles (Fe 3 O 4 @ZIF-8) were synthesized using a step-by-step assembly method, and then integrated into polymer of intrinsic microporosity (PIM-1) matrix to develop MMMs with well-defined magnetic channels for O 2 /N 2 separation. In comparison with Fe 3 O 4 , Fe 3 O 4 @ZIF-8 nanoparticles exhibited significantly enhanced compatibility with the polymer matrix, thereby facilitating uniform dispersion and improving interfacial adhesion. Gas permeation experiments revealed that the magnetic PIM-1/Fe 3 O 4 @ZIF-8 MMMs demonstrated enhanced O 2 /N 2 separation performance due to the combined effects of magnetic responsiveness and the presence of ZIF-8 magnetic channels. Under a magnetic field strength of 56mT, the magnetic MMM with a 4 wt% loading of Fe 3 O 4 @ZIF-8 exhibited optimal O 2 /N 2 separation performance with O 2 permeability of 710 Barrer and O 2 /N 2 selectivity of 3.64. These values represented a significant improvement of 42% and 24%, respectively, compared to pure PIM-1 membrane. Moreover, the simultaneous improvement of permeability and selectivity enabled the achievement of Robeson’s 2008 upper bound for O 2 /N 2 separation, underscoring the great potential of Fe 3 O 4 @ZIF-8 nanoparticles for designing magnetic MMMs with favorable structural attributes and exceptional separation efficiency.
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Materials Today Chemistry
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2024
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IF 6.7
Shihong Lin,Bingyan Chen,Ying Xu,Zhiyu Li,Yuanrong Liao,Jun Wang,Peiyan Yu,Yang Zhang
Synergistic surface-enhanced Raman spectroscopy (SERS) substrates, leveraging the combined strengths of electromagnetic enhancement (EM) and chemical enhancement (CM), have been extensively explored in the literature. In this study, we introduce a distinctive approach to fabricating core@shell structures, specifically employing silver nanowire @ zeolite imidazole framework-8 (AgNW@ZIF-8) as synergistic SERS substrates. Notably, these substrates offer meticulous control over shell thickness through a straightforward post-synthesis procedure. Utilizing Ag nanowires as the plasmonic core, selected for their broader localized surface plasmon resonance (LSPR) absorption range compared to nanoparticles , we encapsulate them within ZIF-8, a metal-organic framework (MOF) recognized for its proficient charge transfer (CT) properties. Our investigation encompasses the SERS performance across various Raman-active molecules, considering their diverse sizes and distinct frontier molecular orbitals (FMO) energy levels. Additionally, we systematically explore the influence of alterations in shell thickness on SERS outcomes and scrutinize the impact of probe orientation. This comprehensive study not only advances the understanding of synergistic effects intrinsic to MOFs-metal SERS substrates but also provides valuable insights for the rational design of highly sensitive substrates tailored for practical applications.
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CONSTRUCTION AND BUILDING MATERIALS
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2025
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IF 8
Dandan Yan,Min Li,Chunxiang Qian
Phase change materials are used in cementitious materials to reduce the hydration temperature rise and thus inhibit the temperature cracks generation. However, the influence mechanism of phase change materials on the hydration properties of cementitious materials is still unclear. In this study, ZIF-8-based composite phase change materials (CPCM) were added to the Portland cement (PC) clinker-anhydrite (C$)-calcium sulfoaluminate (CSA) cement ternary system (PCCSA) in the form of admixtures. The effects of controlling the phase change temperatures, dosages of CPCM and hydration temperatures on the hydration exothermic characteristics, hydration products and the compressive strength development in the PCCSA composite system were investigated. CPCM addition reduced the hydration exothermic rate and cumulative heat release of the ternary system, especially when the phase change temperature of CPCM was 25.8 ℃, and the larger the dosage, the more obvious the reduction effect. In addition, CPCM did not participate in the hydration reaction of the system, but promoted the formation of CH and AFm. Simultaneously, the compressive strength of the PCCSA system paste containing CPCM decreased due to increased porosity in the paste. Furthermore, elevated hydration temperature significantly improved the hydration rate of the system, while reduced the hydration degree, and the hydration products types of the system were not affected by the hydration temperatures. This study results are fundamental for predicting the hydration behavior of cement systems containing CPCM and promoting the application of composite phase change materials in cementitious materials.
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