SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Rongli Fang,Le Zhang,Shunjiang Huang,Ying Jin,Kaiwen Guo,Bingying Li,Yue Wang
Electrochemical treatment of saline or brackish water by capacitive deionization (CDI) is a novel resource-saving solution to ensure the availability of freshwater resources in the environment. MOF (metal–organic framework) derived carbon as a novel carbonaceous material in CDI has received considerable research attention. Among them, ZIF-L-derived carbon (ZC) suffers from problems such as self-aggregation, poor mesoporous structure, and low electrical conductivity, which lead to poor CDI performance. In this paper, a strategy of ZIF-L coated with polydopamine (PDA) is proposed to solve the above problems. When the amount of PDA was 0.5 g, ZIF-L@PDA 0.5 -derived carbon composite (ZPC 0.5 ) is obtained for efficient capacitive deionization. The ZPC 0.5 composite not only maintains the 2D leaf shaped structure consistent with ZIF-L, exposing more active sites, but also has an elevated mesopore occupancy ratio to promote solution diffusion. Meanwhile, the interaction between PDA and ZIF-L makes the ZPC 0.5 have a cavity structure, which improves the mass transfer capacity. The resulting ZPC 0.5 composite has a specific capacitance (165.8 F g −1 ) that is 3.86 times higher than that of ZC (42.9 F g −1 ). Consequently, in 1.2 V, 500 mg/L NaCl solution, the symmetric CDI cell ZPC 0.5 //ZPC 0.5 exhibits an excellent desalination capacity (29.6 mg/g), which is 2.69 times that of the ZC//ZC.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Zhihao Si,Di Cai,Shufeng Li,Changwei Zhang,Peiyong Qin,Tianwei Tan
Recently, zeolitic imidazolate framework-8 (ZIF-8) has been recognized as one of the most potential doping particles for pervaporation separation of organics because of its unique pore structure and high surface area. However, in this work, ZIF-8-based mixed matrix membrane (MMM) was found to have poor stability in separating acetone-butanol-ethanol (ABE) fermentation broth due to the organic acids caused the degradation of ZIF-8 framework. To improve the stability of ZIF-8-based MMM in practical application, ZIF-8-derived nanoporous carbon (ZNC) was prepared via direct carbonization and used to replace ZIF-8 in MMM. Results indicated the acid-stability, specific surface area and pore volume of ZNC were all remarkably improved compared with those of ZIF-8. The ZNC-based MMM showed high hydrophobicity and good compatibility between particles and polymer. More attractively, during 100 h of continuous operation for ABE recovery from fermentation broth, ZNC incorporated MMM exhibited a stable performance with an average total flux of 1870 g m −2 h −1 and a n -butanol separation factor of 20.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2023
·
IF 5.2
Guohong Pu,Aoshuang Yang,Yongsheng Li,Zhuoni Jiang,Xiaoan Li,Zhengguo Chen,Ren He,Kai Zhang,Wenbin Yang
Carbon fiber(CF) reinforced flexible composites had a wide range of applications. However, the interfacial adhesion of composites was weak as a result of the smooth and chemically inert CF surface. To settle this issue, this paper described a method to enhance the specific surface area, roughness and wettability of the CF surface by in situ growing Cobalt-based zeolitic imidazolate framework (ZIF-67) nanocrystals and CF reinforced waterborne polyurethane (WPU) composites were prepared by a simple casting method. Scanning electron microscopy clearly revealed uniformly grown ZIF-67 nanoarrays with distinct morphology on the CF surface. As a result, the CF@ZIF-3 electrode exhibited excellent electrochemical property, with specific capacitance reaching 368.2 mF/cm 2 . The reinforcing effect of ZIF-67 with different morphology was further verified through transverse fiber bundle tension test and shear bonding strength measurements, showing improvements of 51.9 and 72.1% respectively, in comparison to the CF/WPU composites due to the unique structure of the ZIF-67 nanocrystals acted as buffer area, effectively relieving stress concentration and altering the direction of crack propagation. As a result, the interfacial properties of the composites were enhanced. Moreover, tensile and tear strengths of CF@ZIF/WPU composites showed remarkable improvement compared to CF/WPU composites. This study presented a potential reinforcement strategy for achieving high-performance CF/WPU composites. Highlights ZIF-67 with different morphologies were grown in situ on the CF surface. CF@ZIF electrode exhibited excellent electrochemical property. ZIF-67 interface layer improved interfacial properties of composites. The tensile strength of the composites improved after ZIF-67 modification. Introduction of ZIF-67 enhanced the tear strength of composites.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Siyu Wang,Laiyu Luo,Zhihui Li,Chengxu Jin,Nan Wang,Dongxu Wang,Aiping Wu,Haijing Yan,Lei Wang,Chungui Tian
The removal of the pollutants from the environment is the need of the environmental protection. ZIF-8 is promising adsorbents, and the construction of ZIF-8 assembly is essential to boost its performance. Here, we showed the easy synthesis of two-dimensional (2D) assembly built by ZIF-8 particles (2D A-ZIF-8) for the high-efficient capture of the iodine (I 2 ) and dyes. The assembly was synthesized by the controllable reaction of 2-methylimidazole (2-MIM) with 2D Zn-glycerol (Zn-GL) precursor. Time-dependent experiments showed the predominant replacement of GL at outer boundary and then basic plane of the precursor by 2-MIM. The assembly can be synthesized with high output and combined the advantage of large accessible surface of 2D sheets, the plentiful pores of ZIF-8 and enhanced stability of assembly, endowing the large potential as adsorbent. The high adsorption capacity of I 2 (200 wt%) was achieved on A-ZIF-8, while it is about 128 wt% on traditional dodecahedronal ZIF-8. The assembly also showed the excellent adsorption capacity for methyl orange (MO) (46.3 mg g -1 ) and methylene blue (MB) (46.5 mg g -1 ) at a concentration of 50 mg L -1 . It can be easily separated for reuse benefited from the large size and enhanced stability of assembly.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Long Zhou,Na Li,Xiaoying Jin,Gary Owens,Zuliang Chen
A n Fe@ZIF-8 composite, which combined the tailorable porosity of ZIF-8 with the versatile functionality of Fe nanoparticles ( n Fe), was synthesized for Pb(II) removal. Batch adsorption experiments showed that more than 95.3% of Pb(II) was removed from aqueous solution at an initial concentration of 50 mg L −1 when using n Fe@ZIF-8 within 60 min at pH value of 5. The mechanism of Pb(II) removal was studied via characterization of changes the morphology, size and composition of in n Fe@ZIF-8 before and after exposure the solutions containing Pb(II). Specifically, Fourier transform infrared (FTIR) and X-ray powder diffraction (XRD) indicated that n Fe@ZIF-8 was successfully synthesized and also remained stable after Pb(II) removal. Transmission Electron Microscope (TEM) and Scanning electron microscopy-X-ray energy dispersive spectrometer (SEM-EDS) both confirmed that Pb(II) was partially adhered onto the surface of n Fe@ZIF-8, where X-ray photoelectron spectroscopy (XPS) specifically revealed the existence of Pb(0) on the surface. This indicated that Pb(II) was initially adsorbed onto the surface of n Fe@ZIF-8 and subsequently reduced to Pb(0). Moreover, Pb(II) removal fit well to kinetics of absorption and reduction. Finally, in practice, n Fe@ZIF-8 could remove 96.3% of Pb(II) from an electroplating wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
Ru Jia,Fugui Xiao,Qiaofang Fu,Ying Wu
BiOI was modified with poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT:PSS) to function as an organic hole conductor, thereby accelerating the transfer of light-generated holes. Subsequently, the catalyst was immobilized on ZIF-8 to enhance the contact area between the active sites of the catalyst and the pollutant. The successful preparation of the ZIF-8@BiOI/PEDOT:PSS was confirmed through various characterizations. Compared to pure BiOI, the ZIF-8@BiOI/PEDOT:PSS composite material demonstrates markedly enhanced visible-light-driven photocatalytic activity in the degradation of Rhodamine B (RhB) dye. The ZIF-8@BiOI/PEDOT:PSS composite photocatalyst exhibits a maximum RhB degradation efficiency of 92.64%, with a degradation rate constant (k) approximately 2.9 times higher than that of pure BiOI. Additionally, the ZIF-8@BiOI/PEDOT:PSS also exhibits outstanding photocatalytic performance in the degradation of methylene blue and methyl orange. Moreover, its catalytic activity remains nearly unchanged after five consecutive reuse cycles, demonstrating excellent recyclability. This study presents a novel strategy for improving the photocatalytic performance of such materials.
研究领域:
材料科学
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环境科学
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纳米技术
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催化
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2021
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IF 9.594
Yuchen Xiao,Huajun Yang,Xianhui Bu,Pingyun Feng
We report a family of carbon materials (denoted SFZ8C) prepared from templated carbonization of zeolitic imidazolate framework-8 (ZIF-8) in NaCl–ZnCl 2 eutectic salt. The hard-templating effect of the salt is utilized to sustain the framework and maximize the porosity during carbonization. In addition to rich surface nitrogen and oxygen species, SFZ8Cs have large specific surface area. These combined features give rise to excellent adsorption properties for light hydrocarbon gases. SFZ8Cs have both C 2 H 2 /CO 2 selective and C 3 /C 2 selective adsorption, as well as the ability to selectively remove impurities from methane. Particularly noteworthy is the excellent C 3 /C 2 selective adsorption performance by SFZ8C-900. Its propane/ethane selectivity (7.68) is on par with the best value (7.72) reported so far, yet SFZ8C-900 excels in propane uptake capacity. The multifunctional properties together with the ease for the mass production make SFZ8Cs promising for a number of important applications.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Duoyong Zhang,Chen Zhang,Xinqi Zhang,Yongqiang Tian,Xusheng Cheng,Xuancan Zhu,Liwei Wang
To enhance CO 2 sorption efficiency under low-pressure conditions and effectively compete with N 2 sorption in flue gas, modifications are implemented aimed at improving the adsorption capacity and selectivity of ZIF-8, renowned for their robust stability. Deep eutectic solvent (DES) comprising tetraethylammonium chloride (TEAC), tetrapropylammonium chloride (TPAC), and tetrabutylammonium bromide (TBAB) as hydrogen-bond acceptors, along with ethanolamine (MEA) as the hydrogen-bond donor, were meticulously prepared for this purpose. ZIF-8 underwent modification through DES loading, resulting in the distinctive emergence of a “core-membrane” structure. Characterization revealed that the DES effectively adhered to the surface of ZIF-8 in a membrane-like structure, without altering the chemical structure or pore size of ZIF-8. The most significant enhancement in sorption capacity was observed with TPAC&MEA modification. Considering the presence of N 2 partial pressure in the flue gas, at 0.05 and 1 bar, the CO 2 adsorption capacities reached 1.92 and 3.03 mmol g −1 , respectively, increasing 71.11 and 4.00 times compared to pristine ZIF-8. The ZIF-8 exhibited a CO 2 /N 2 separation coefficient of 72.77, which increased to a maximum of 997.50 after DES modification. Additionally, the modified material demonstrated exceptional cyclic and thermal stability during testing. This study significantly elevates the CO 2 adsorption capacity and selectivity of solid materials within the low-pressure range, providing pivotal support for CO 2 capture and decarbonization efforts.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2024
·Vol. 12
·期 14
·3481-3493
·
IF 6.1
Ting Liu,Kangkang Huang,Yuxia Yang,Shengwu Wen,Jingxian Zhang,Suiping Deng,Shaozao Tan,Langhuan Huang
Bacterial infection is the most common risk factor that causes the failure of implantation surgery. Therefore, the development of biocompatible implants with excellent antibacterial properties is of utmost importance. In this study, NIR light-driven AgBiS2@ZIF-8 hybrid photocatalysts for rapid bacteria-killing were prepared. AgBiS2@ZIF-8 exhibited excellent photocatalytic activity due to the rapid transfer of photoelectrons from AgBiS2 to ZIF-8, resulting in abundant reactive oxygen species (ROS) to kill bacteria. Meanwhile, AgBiS2@ZIF-8 exhibited a noteworthy photothermal effect, which could effectively convert NIR light into heat. Subsequently, the NIR light-driven antibacterial activity of AgBiS2@ZIF-8/Ti against S. aureus and E. coli was studied. The experimental results showed that AgBiS2@ZIF-8 displayed enhanced photodynamic therapy (PDT) and photothermal therapy (PTT) performance. Under irradiation with 808 nm NIR light for 10 min, AgBiS2@ZIF-8/Ti could effectively eliminate 98.55% of S. aureus in vitro, 99.34% of E. coli in vitro and 95% S. aureus in vivo. At the same time, AgBiS2@ZIF-8/Ti had good biocompatibility. Therefore, AgBiS2@ZIF-8/Ti showed potential as an antibacterial material, which provided a strategy to fight polymicrobial infections.
研究领域:
材料科学
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生物医学工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Yueting Chen,Shaokun Tang
Zeolitic imidazole framework-8 (ZIF-8) with a novel porous hydrangea-like morphology was successfully synthesized with solvothermal synthesis using zinc nitrate as the metal source and 2-methylimidazole as the organic ligand. The effects of reaction temperature and reaction time on the morphology of the crystal were investigated and the samples were characterized in detail. The results show that the porous hydrangea-like ZIF-8 crystal can be obtained at different temperatures from 110 to 140 °C. At the same temperature, with the increase of reaction time, the particles are transformed from porous hydrangea-like into the rhombohedral polyhedron. Combining primary particle self-assembly with Ostwald ripening , we propose a mechanism for the formation of porous hydrangea-like ZIF-8 in a classical crystal growth pathway. In comparison, ZIF-8 with rhombohedral polyhedron can be quickly synthesized via microwave-assisted synthesis.
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
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Hanhan Chen,Xiaobin Wang,Yi Liu,Tengfei Yang,Naitao Yang,Bo Meng,Xiaoyao Tan,Shaomin Liu
Despite many methods available to synthesize MOF membrane, the cost-effective synthesis with high reproducibility and scalability is still a challenge. We present here a homologous support-induced approach for the growth of ZIF membrane supported on the dual-layer ZnO–Al2O3 hollow fibers, which has the potential for applications at larger scales. The developed unique dual-layer hollow fibers consisting of a thin outer ZnO layer firmly attached onto an inner porous alumina substrate were realized through one-step co-extrusion/sintering technique. During the MOF membrane synthesis, ZnO can be used not only as the support, but also as the nucleation sites and growth centers for the ZIF-8 membrane formation. More importantly, ZnO can act as a transitional bridge to direct the membrane growth outward along the support and inward embedded into the support, which significantly improving the binding force between the support and MOF, thus bringing in the outstanding membrane stability. Permeation of single gas and separation of binary mixtures revealed that the prepared membranes were free of defects. The resultant ZIF-8 composite membrane exhibits good hydrogen separation performance and excellent reproducibility. This protocol can achieve an easy and large-scale synthesis. In addition to ZIF-8 membrane, ZIF-67 membrane was also successfully synthesized via this method, which may provide some general guidelines for the preparation of other MOF membranes.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 22
·32935-32949
·
IF 0
Wang Junfeng,Wang Heng,Qi Xianjin,Zhi Gang,Wang Jianhua
The high cost and low adsorption capacity of primary metal-organic frameworks (ZIF-8) limit their application in heavy metal removal. In this paper, Co/Zn bimetallic MOF materials were synthesized with excellent adsorption performance for As 5+ . The adsorption reached equilibrium after 180 min and the maximum adsorption was 250.088 mg/g. In addition, Co-ZIF-8 showed strong selective adsorption of As 5+ . The adsorption process model of Co-ZIF-8 fits well with the pseudo-second-order kinetic model ( R 2 =0.997) and Langmuir isotherm model ( R 2 =0.994), and it is demonstrated that the adsorption behavior of the adsorbent is a single layer of chemical adsorption. In addition, when the adsorbent enters the arsenic-containing solution, the surface of Co-ZIF-8 is hydrolyzed to produce a large number of Co-OH active sites, and As 5+ arrives at the surface of Co-ZIF-8 by electrostatic adsorption and combines with the active sites to generate the arsenic-containing complex As-O-Co. After four cycles, Co-ZIF-8 showed 80% adsorption of As 5+ . This study not only provides a new method to capture As 5+ in water by preparing MOF with partial replacement of the central metal, but also has great significance for the harmless disposal of polluted water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
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