SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
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IF 5.107
Xing Long,Ya-Shuo Chen,Qian Zheng,Xing-Xiao Xie,Hao Tang,Li-Ping Jiang,Juan-Tao Jiang,Jian-Hua Qiu
Metal-organic frameworks (MOFs) are capable in capture and storage of iodine ions with high efficiency, and polymer/MOF nanocomposite membrane has the potential to be used for efficient removal of iodine from radioactive wastewater. In this work, we have reported a PVDF/ZIF-8 nanocomposite adsorption membrane prepared by contra-diffusion method. The combination of surface graft of poly(4-vinylpyridien) brushes and optimal addition of sodium formate into ligand contributes to the formation of a well-intergrown and continuous ZIF-8 layer on the metal ions side surface of PVDF- g -P4VP membrane. In the batch adsorption, the PVDF/ZIF-8 nanocomposite membrane exhibits high affinity for iodine following a pseudo-second-order kinetics and fitting the Freundlich isotherm model with a maximum adsorption capacity of 73.33 mg/g. In the dynamic adsorption, the PVDF/ZIF-8 nanocomposite membrane exhibits a high flux of 66.19 L/(m 2 ⋅h⋅MPa) and an iodine removal efficiency of 73% until 180 min. Initial iodine concentration has a little influence on the iodine removal efficiency, but solution pH shows a significant effect. The iodine removal efficiency can be maintained around 92% in a weakly alkaline medium of pH = 8. The PVDF/ZIF-8 nanocomposite membrane possesses an excellent reusability with an iodine removal efficiency of 73.4% after five cycles.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2015
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IF 2.999
Xin Jiang,Hai-Yu Chen,Ling-Li Liu,Ling-Guang Qiu,Xia Jiang
Well dispersed Fe 3 O 4 embedded ZIF-8 nanocrystals were synthesized through a facile co-precipitation approach. Brunauer–Emmett–Teller (BET) and magnetic hysteresis loop analysis revealed that the hybrid nanoparticles with large surface areas exhibited good magnetic properties. The magnetic Fe 3 O 4 /ZIF-8 nanocomposites were used to remove hydroquinone (HQ) from aqueous solution. HQ adsorption kinetics followed the pseudo-second-order, and the equilibrations were established between 100 and 200 min. The adsorption isotherms of the nanocomposites could be described very well by the Langmuir equation with ultra-high maximum adsorption capacity of 2527 mg g −1 . Besides, the used Fe 3 O 4 /ZIF-8 could be conveniently regenerated by washing with methanol, and the regeneration efficiency could remain 90% after 3 cycles of regeneration. Along with the magnetic separation ability, the as-prepared Fe 3 O 4 /ZIF-8 nanocomposites might be promising candidate for efficient wastewater purification.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER SCIENCE SERIES A
·
2023
·Vol. 65
·期 1
·72-81
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IF 1
Ting Pu,Yang Qin,Xu Nan,Chen Fubin,Zhang Gui,Yang Chunyan
Abstract Naringenin, an herbal ingredient possesses a diversity of pharmacological action and bioactive functions. In this study, surface molecularly imprinted polymers named as Zeolite imidazolate framework-8 were successfully synthesized and applied in the selective adsorption of naringenin. A series of adsorption experiments evaluated the adsorption properties of polymers. The results showed that the molecularly imprinted polymers had a higher adsorption capacity than non-imprinted polymers. In addition, they have good selectivity for Naringenin compared with other flavonoid compounds, and its imprinting factor for naringenin is as high as 3 in single solutions. The Scatchard plots showed two distinct linear portions, indicating that two kinds of binding sites exist in the molecularly imprinted polymers. After eight cycles, the adsorption capacity of polymers did not decrease significantly in the initial affinity. These results demonstrated that prepared molecularly imprinted polymers could be promising functional materials for the selective adsorption of naringenin.
研究领域:
材料科学
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药理学
✓ 已验证
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 5
·485
·
IF 4.501
Chong Chen,Yun Li,Jilin Cao
Methane hydrate has been extensively studied as a potential medium for natural gas storage and transportation. Due to their high specific surface area, tunable porous structure, and surface chemistry, metal–organic frameworks are ideal materials to exhibit the catalytic effect for the formation process of gas hydrate. In this paper, hollow ZIF-8 nanoparticles are synthesized using the hard template method. The synthesized hollow ZIF-8 nanoparticles are used in the adsorption and methane hydrate formation process. The effect of pre-adsorbed water mass in hollow ZIF-8 nanoparticles on methane storage capacity and the hydrate formation rate is investigated. The storage capacity of methane on wet, hollow ZIF-8 is augmented with an increase in the mass ratio of pre-adsorbed water and dry, hollow ZIF-8 (RW), and the maximum adsorption capacity of methane on hollow ZIF-8 with aRWof 1.2 can reach 20.72 mmol/g at 275 K and 8.57 MPa. With the decrease inRW, the wet, hollow ZIF-8 exhibits a shortened induction time and an accelerated growth rate. The formation of methane hydrate on hollow ZIF-8 is further demonstrated with the enthalpy of the generation reaction. This work provides a promising alternative material for methane storage.
研究领域:
材料科学
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能源存储
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化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Keming Zhang,Xianye Luo,Sihui Li,Xiaohe Tian,Qingnan Wang,Chenlu Liu,Yanting Tang,Xiaoting Feng,Rui Zhang,Shuangfeng Yin,Shaofei Wang
Developing high-performance H 2 /CH 4 separation membranes is of great potential for H 2 production in the petroleum industry. Incorporating nanofillers into a polymer matrix to form mixed matrix membranes (MMMs) can elevate selectivity and permeability, but poor polymer-filler interfacial compatibility and filler aggregation are formidable problems. Targeting this, we propose a novel approach by incorporating a metal–organic framework (MOF) gel, ZIF-8 gel, as the versatile filler to a high free volume polymer PIM-1 and investigate the H 2 /CH 4 separation capabilities of the MMMs. Benefiting from the gel network morphology of ZIF-8, they were dispersed evenly in the PIM-1 matrix. The interconnected gel network structure of ZIF-8 gel helped to construct continuous gas transport pathways in the polymer. As a result, the H 2 /CH 4 separation performance was notably improved, demonstrating a substantial increase in H 2 permeability by 78.9% (exceeding 6800 Barrer) and a 38.0% enhancement in H 2 /CH 4 selectivity at a ZIF-8 gel loading of 31.0 wt%. These improvements surpassed the upper bound established in 2008. The Maxwell and Lewis-Nielsen models were developed to clarify gas transport mechanisms across membranes, and the experimental data of ZIF-8 gel/PIM-1 was well-matched with the calculated results of the Lewis-Nielsen models. Adopting MOF gel as fillers may pave a new approach to design high-performance MMMs with interconnected transport pathways.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Daile Zhang,Jianghua Zhang,Mingdi Pan,Yun Wang,Ting Sun
Electrochemical deposition is a facile technique to fabricate metal organic frameworks (MOFs) based materials in a short reaction time under mild conditions. In this work, novel necklace-like zeolitic imidazole framework@multiwalled carbon nanotubes (ZIF-8@MWCNTs) composite was synthesized by electrochemical method for the first time and then used as precursor for subsequent carbonization and acid treatment. The resultant porous carbon material (C-ZIF-8@MWCNTs) maintained the necklace-like structure with a high surface area of 1063.2 m 2 g −1 . When used as electrode material for supercapacitor , the C-ZIF-8@MWCNTs demonstrated a high specific capacitance of 259.2 F g −1 at the current density of 0.5 A g −1 . Further, the capacitance retention could reach 92% after 5000 cycles under the current density of 15 A g −1 . Due to the large specific surface area of the porous carbon derived from ZIF-8 and the intrinsic high conductivity, the C-ZIF-8@MWCNTs displayed good rate ability and cycle performance. The current work can expand the method to synthesize functional MOFs-based materials for advanced applications.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 20
·5412-5419
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IF 5.976
Pengyuan Wang,Xiaoqin Zou,Huaqiao Tan,Sheng Wu,Lingchang Jiang,Guangshan Zhu
Gas sensing performances in ZnO sensors are critically limited by their fast electron–hole recombination, low gas selectivity and elevated operation temperature. To alleviate these problems, new and high-performance sensor materials are desirable. Herein, we fabricate a core–shell composite material of POM@ZIF-8@ZnO with an ultrathin ZIF-8 film containing H5PMo10V2O40 polyoxometalate on the ZnO substrate surface. The device based on this composite exhibits an improved gas sensing ability toward formaldehyde (HCHO) at room temperature (25 °C) with a sensitivity of ∼0.4 ppm. Additionally, the POM@ZIF-8@ZnO material exhibits selective gas responses for reducible gases with small molecular sizes, in particular for a selectivity value of 15.0 for formaldehyde over ethanol. The specific roles of the ZIF-8 shell and POM are discussed in detail: ZIF-8 is responsible for concentrating and recognizing analyte molecules on the ZnO surface, and POM accounts for enhancing the sensing ability. The new material of POM@ZIF-8@ZnO with high performance holds great promise in sensor materials for selective formaldehyde sensing.
研究领域:
材料科学
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传感器技术
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化学
✓ 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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2022
·
IF 5.518
Yaling Ye,Longwei Yin,Gary Owens,Zuliang Chen
Controlling the slow release of drugs in carriers and reducing environmental pollution and damage from antibiotics is important and challenging research. In this paper, a novel composite material of carbonized FeNPs@ZIF-8 (C-Fe 3 O 4 @ZIF-8) was used to load and release doxorubicin hydrochloride (DOX). Compared with conventional ZIFs materials, greatly enhancing the magnetic properties , drug loading capacity and controlled drug release of the carrier agent. Interestingly, by establishing a dual stimulus response system with environmental factors of pH and temperature, results showed release rate of 61.6 % at a pH of 3 and a temperature of 37 °C. In addition, the SEM-EDS results showed that the surface of C-Fe 3 O 4 @ZIF-8 was partially broken but maintained a stable morphology before and after release. Meanwhile the nitrogen absorption desorption curve (BET) and hysteresis loop reveal that C-Fe 3 O 4 @ZIF-8 can maintain a large specific surface area and a magnetization intensity of 12.4 emu g −1 after release. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR), on the other hand, reveal the presence of partial ligand and hydrogen bond breaks during the release of DOX from DOX-loaded C-Fe 3 O 4 @ZIF-8. Finally, the release of DOX from C-Fe 3 O 4 @ZIF-8 at different pH and temperature is consistent with the Higuch and Bhaskas models, where the latter dominates and proposes a release mechanism. Therefore, the magnetic composite C-Fe 3 O 4 @ZIF-8 in this study has great potential for DOX to effectively control drug release and targeted cancer therapy.
研究领域:
药学
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生物医学工程
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纳米医学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2023
·
IF 5.7
Zhike Wang,Zhihang Chen,Cunling Ye
Background The precise design or functionalization of metal organic frameworks (MOFs) based on the properties of organic dyes is a promising direction in environment remediation. Methods Herein, using methyl orange (MO) as the target dye, cetylpyridinium bromide (CPB) functionalized ZIF-8 (CPB@ZIF-8) was fabricated by the post-synthetic modification strategy. Significant findings The surface area and the pore volume of CPB@ZIF-8 are greatly reduced compared with pure ZIF-8. However, the introduction of amphiphilic CPB molecules into ZIF-8 can significantly enhance the adsorption performance of MO. This enhanced MO adsorption capacity can be attributed to the incorporation of more positively charged sites, hydrophobic sites and aromatic rings in the CPB-modified ZIF-8 frameworks, which provides the electrostatic attractions, the hydrophobic and π-π interactions that mainly govern the adsorption of MO on CPB@ZIF-8. The pseudo-second-order kinetic model and the Langmuir isotherm model can well represent the adsorption process of MO. The maximum adsorption capacity (195.54 mg/g) has been obtained at 30 °C, outperforming pristine ZIF-8 and various reported absorbents. The prepared CPB@ZIF-8 composite is a superior example of the tunable adsorption affinity of MOFs for anionic dyes.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Wenquan Kong,Maria Serdechnova,Valeryia Kasneryk,Dahai Gao,Hao Wang,Xinyuan Xie,Carsten Blawert,Mikhail L. Zheludkevich,You Zhang
An efficient and simple in-situ/mechanical two-step strategy has been discovered for the fabrication of nanocontainers based on zeolite imidazole framework-8 (ZIF-8) with corrosion inhibitors (benzotriazole, BTA). The nanocontainers were applied in anticorrosive coatings with anticorrosion and antibacterial bifunctions for aluminum alloys AA2024. The effects of ZIF-8 modified with the corrosion inhibitor via different methods (in-situ, mechanical, and two-step strategies) on its morphology, composition, structure, loading/release behavior were studied and discussed. Results showed that the amount of loaded BTA was positively correlated with the crystal size of the final ZIF-8, impacting sustained release. Compared with the conventional primary load (in-situ and mechanical loading way), the two-step loading method (in-situ followed by mechanical treatment) achieved a higher BTA loading without evident ZIF-8 morphology and structure changes. The two-step modified (2-BTA@ZIF-8) powders exhibited good corrosion inhibition and remarkable antibacterial properties against Escherichia coli and Staphylococcus aureus . Additionally, the 1-BTA@ZIF-8 (in-situ strategy), 1-BTA/ZIF-8 (mechanical strategy) and 2-BTA@ZIF-8 composites were dispersed in acrylic resin to prepare anticorrosive and antibacterial bifunctional coatings. Results showed that the 2-BTA@ZIF-8 incorporated acrylic coatings exhibited superior anticorrosion performance and antimicrobial activity compared to the unmodified coating due to the controlled release of BTA. Thus, elaborated strategy represents a feasible and effective way to construct high-performance anticorrosive and antimicrobial coatings with metal-organic framework materials.
研究领域:
材料科学
·
表面工程
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防腐技术
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Shufeng Li,Zhe Chen,Yinhua Yang,Zhihao Si,Pei Li,Peiyong Qin,Tianwei Tan
The hydrophobicity of porous particles is important for the performance of mixed-matrix membranes for pervaporation separation of n -butanol aqueous solution. Here, a strategy was proposed to further enhance the hydrophobicity of ZIF-8. ZIF-8 particles were first coated by polydopamine (PDA) to create chemically reactive surface and then modified with silane coupling agents n -propyltrimethoxysilane and n -octyltriethoxysilane. The water contact angles of the obtained P-ZIF-8@PDA and O-ZIF-8@PDA separately increased from 132.8° to 137.3° and 151.5°, which demonstrated a remarkable enhancement in hydrophobicity. The silane-modified ZIF-8 particles were subsequently incorporated into PDMS to fabricate mixed-matrix membranes, which exhibited an improved adsorption selectivity for butanol. The best membrane with 1 wt% loading (O-ZIF-8@PDA) exhibited a separation factor of 56 and butanol flux of 480.6 g m −2 h −1 for a 1.5 wt% butanol solution at 55 °C. The separation factor increased by 23% compared with that of a ZIF-8/PDMS membrane. Moreover, compared with those of a pure PDMS membrane, the separation factor and butanol flux increased by 34% and 85%, respectively. Thus, the strategy is an effective method to improve the PV performance of PDMS membranes for butanol separation.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaoqian Meng,Rui Gao,Ming Zheng,Xin Zhou,Xianfa Zhang,Xiaoli Cheng,Yingming Xu,Shan Gao,Lihua Huo
Real-time monitoring of chlorine gas (Cl 2 ) with a strong irritating odor is an indispensable means of avoiding its contamination of the air and harm to the body. To achieve this purpose, a novel gas-sensitive material capable of detecting low concentrations of Cl 2 at near room temperature is developed in this paper. ZIF-8 with a kinetic diameter of 3.4 Å in the designed ZnO@ZIF-8 composites is able to sieve gas molecules with different kinetic diameters, enabling effective improvement of the selectivity of the gas-sensitive materials. In addition, the porous structure of ZIF-8 can provide more reactive sites, which is conducive to improving gas adsorption capacity and providing of channels for gas diffusion. In this study, ZnO@ZIF-8 heterojunction composites are prepared by combining the advantages of ZnO and ZIF-8, which provides a new method for real-time monitoring of low concentrations of Cl 2 , and also has potential practical applications in fields such as environmental monitoring and industrial safety.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 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）