CHEMOSPHERE
·
2022
·
IF 8.943
Longwei Yin,Wenpeng Li,Shen Lin,Gary Owens,Zuliang Chen
Arsenic contamination is an increasing global environmental problem, especially in mining industry wastewater where both arsenite (As(III)) and arsenate (As(V)) have been routinely detected. In this paper, a novel porous metal-organic framework material (ZIF-8) was composited with iron nanoparticles (FeNPs) to form a functional material (ZIF-8@FeNPs) for the simultaneous removal of As(III)/(V) from wastewater. The material effectively removed both As(III) and As(V) with removal efficiencies of 99.9 and 71.2%, respectively. Advanced characterization techniques including X-ray photoelectron spectroscopy (XPS) and Fourier infrared (FTIR) indicated that removal of As(III) and As(V) involved complex formation. Adsorption kinetics followed a pseudo-second order kinetics indicating adsorption involved chemisorption . After four cycles of reuse the he removal rate of As species was still relatively high at > 60% When ZIF-8@FeNPs were used to remove As from real wastewater from acid mines the removal efficiency was 94.27%. Finally, a As(III) and As(V) removal mechanism was proposed.
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高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2018
·Vol. 645
·期 2
·73-78
·
IF 1.179
Xufei Li,Bo Tang,Weiqiu Huang,Haogang Yu
Zeolite imidazolate frameworks (ZIFs) represent a class of metal-organic frameworks (MOFs) for various potential applications due to their outstanding properties. However, to date, the creation of nanoframes with tunable structure faces a challenge. Herein, we develop a facile and efficient physical method that allows the preparation of ZIF-90 with controllable surface area. In this study, the effect of various stirring time and speed in the acceleration of the precursor dissolution are revealed. The study shows that a moderate stirring speed (640 r · min –1 ) and reaction time (6 h) are the optimal conditions to synthesize ZIF-90 with a high adsorption capacity. More importantly, the maximum adsorption amount of n -hexane is up to 211 mg · g –1 by using this as-prepared sample, which increases by 60 % in comparison with that of the minimum from other sample (133 mg · g –1 ).
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Xia Wang,Fei Yang,Min Jiang,Lingyi Shen,Ji Ma,Jianming Zhang
Effective utilization of waste biomass has been a fascinating topic for the development of sustainable energy. An effective alkaline hydrothermal/pyrolysis process was designed to prepare highly porous carbons noted as HK-PSC800 using waste Platanus acerifolia seeds as precursors. A symmetric supercapacitor (SSC) device based the same two HK-PSC800 electrodes owns the high specific energy density (30.9 Wh kg −1 at a low power density of 500 W kg −1 ) with excellent rate capability. To further optimize the energy density of the device, two types of asymmetric supercapacitors (ASC) with a working potential window of 1.5 V are designed and assembled by using HK-PSC800 and Co 3 O 4 derived from zeolitic imidazolate framework-67 as electrode materials . The specific energy density of as-fabricated ASC (Co 3 O 4 //HK-PSC800) with pure Co 3 O 4 materials as the positive electrode is nearly the same as the SSC (HK-PSC800//HK-PSC800). However, the specific energy density of the other ASC (Co 3 O 4 @HK-PSC800//HK-PSC800) can be improved by 18.8% when 28 wt% Co 3 O 4 is in-situ grown in HK-PSC800 as the positive electrode. This research proves that the suitable composition of ASC electrode materials helps us to develop biomass based carbons materials for application in the high-voltage and high-energy devices.
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高影响因子
Journal of Energy Storage
·
2019
·
IF 3.517
Jianhua Yu,Zhenxing Cui,Xu Li,Di Chen,Jiawen Ji,Qian Zhang,Jing Sui,Liyan Yu,Lifeng Dong
Recently, rational design and synthesis of two-dimensional (2D) nanoflake based architectures have attracted great attention in energy storage systems due to their unique properties, such as high specific surface area, superior electrical and thermal conductivity. Zeolitic imidazolate frameworks (ZIFs) with 2D structure can be synthesized by a facile aqueous method and be used to obtain 2D metallic/binary metallic oxides. In this paper, graphene oxide and Zn 2+ were added in the synthesis of Co-ZIF, and its derived oxide (ZnCoO-G) exhibits 2D nanosheet structure with well dispersed Co 3 O 4 and ZnO nanoparticles after heat treatment. Compared with the derivatives without graphene oxide (ZnCoO) and Zn 2+ (CoO-G), ZnCoO-G demonstrates the highest specific capacitance of 711.6 F g −1 at 1 A g −1 with a capacitance retention of 63.6% at 5 A g −1 after 1000 cycles. Also, an asymmetric supercapacitor (ASC) with ZnCoO-G and commercial active carbon as positive and negative electrodes has a maximum energy density of 18.7 W h kg −1 at a power density of 800 W kg −1 .
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高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Hong Ma,Zhongguo Wang,Xiong-Fei Zhang,Meili Ding,Jianfeng Yao
Zeolitic imidazolate frameworks (ZIFs) hold great potential for carbon capture, while a major challenge for the practical application of ZIFs is the development of convenient three-dimensional bulk materials. Here, sustainable and biodegradable bacterial cellulose (BC) was used as the substrate for ZIF growth. Amino-functionalized ZIF-8 (ZIF-8-NH 2 ) was prepared within BC substrate via an in situ growth approach. ZIF crystals were wrapped uniformly over cellulose fibers and the chelating effect between metal (zinc) ions and hydroxyl groups makes the composites have high interface affinity and compatibility. The resulting foams presented a high CO 2 adsorption capacity of 1.63 mmol/g (25 °C, 1 bar). Moreover, ZIF-8-NH 2 @BC foams are facile to be regenerated by heating at 80 °C. This work provides a new avenue to construct ZIF/cellulose composites for gas treatment applications.
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高影响因子
Science China-Materials
·
2021
·Vol. 64
·期 8
·1997-2007
·
IF 8.273
Fan Shuaikang,Wang Shilin,Wang Xiaobin,Li Zhuoyi,Ma Xu,Wan Xinyi,Hussain Shabab,Peng Xinsheng
Smart proton conductive metal-organic framework (MOF) membranes with dynamic remote control over proton conduction show high potential for use in advanced applications, such as sensors and bioprocesses. Here, we report a photoswitchable proton conductive ZIF-8 membrane by coencapsulating polystyrene sulfonate and graphene quantum dots into a ZIF-8 matrix (GQDs-PSS@ZIF-8) via a solid-confined conversion process. The proton conductivity of the GQDs-PSS@ZIF-8 membrane is 6.3 times higher than that of pristine ZIF-8 and can be reversibly switched by light due to photoluminescence quenching and the photothermal conversion effect, which converts light into heat. The local increase in temperature allows water molecules to escape from the porous channels, which cuts off the proton transport pathways and results in a decrease in proton conductivity. The proton conductivity is restored when the light is off owing to regaining water molecules, which act as proton carriers, from the surroundings. The GQDs-PSS@ZIF-8 membrane responds efficiently to light and exhibits an ON/OFF ratio of 12.8. This photogated proton conduction in MOFs has potential for the development and application of MOF-based protonic solids in advanced photoelectric devices.
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高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2016
·Vol. 32
·期 9
·2377-2382
·
IF 0.844
XU Li-Hong,ZHAO Dong-Yu,LI Yang,GUO Lin
ZIF-8 (zeolitic imidazolate framework-8), a kind of metal-organic framework material, is one of the most important energy materials and widely used in various fields because of its high specific surface area and excellent thermal stability. In this research, we synthesized ZIF-8 by
the traditional hydrothermal synthesis method in a purely methanol system. The obtained particles were ~250 nm in diameter with a rhombic dodecahedron morphology. Moreover, the prepared ZIF-8 materials exhibited good thermal stability and a large surface area. We also found that the rhombic
dodecahedral ZIF-8 enhanced the electro-optical (E-O) properties of nematic liquid crystal (N-LC) depending on the ZIF-8 doping concentrations. ZIF-8 in N-LC cells adsorbs ionic impurities and suppresses the screen effect, leading to a lower driving voltage and faster response time. At a ZIF-8
doping concentration of 0.05%(w, mass fraction), the N-LC cells showed the best E-O properties, including the lowest threshold voltage (V
th) of 0.92 V, the lowest saturation voltage (V
sat) of 1.31 V, and a short response time of 10.04 ms. However, above
a doping concentration of 0.05%(w) ZIF-8 aggregated in N-LC cells, affecting the arrangement of the LC molecules and trapping less impurity ions, which deteriorated the E-O properties of N-LC.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Weili Ye,Jin Li
Formaldehyde vapor (CH 2 O) is a well-known hazardous gas. Long-term exposure to high concentrations of CH 2 O can cause chronic respiratory diseases in humans and increase the risk of cancers such as leukemia and nasopharyngeal cancer. Zeolite imidazolic frame-67 (ZIF-67) has a high specific surface area and porosity; therefore, it can be used to prepare gas-sensitive materials. In this study, rod-flower-like ZnO was obtained by activation of the rod ZnO using 2-methylimidazole. The ZIF-67-coated rod-flower-like ZnO was then used to synthesize ZnO@ZIF-67 (ZZ67). Experimental and theoretical analyses showed that the ZIF-67 on the ZZ67 surface provided abundant active sites for pure ZnO, which helped to capture target gas molecules more quickly in the experimental atmosphere and realize susceptible detection. Moreover, ZZ67 had a high response (1210) to 500 ppm of CH 2 O at room temperature (~25 ℃), which was 4.8 times the response of activated ZnO (251). Furthermore, owing to the high hydrophobicity of ZIF-67, ZZ67 was mainly unaffected by humidity. Overall, ZZ67 exhibited good selectivity, a high response to CH 2 O, and low sensitivity to high relative humidity.
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产品关联
DOI
高影响因子
MOLECULES
·
2019
·Vol. 25
·期 1
·124
·
IF 3.06
Sufeng Zhang,Yongshe Xu,Dongyan Zhao,Wenqiang Chen,Hao Li,Chen Hou
A facile approach was successfully developed for synthesis of cellulose nanocrystals (CNC)-supported magnetic CuFe2O4@Ag@ZIF-8 nanospheres which consist of a paramagnetic CuFe2O4@Ag core and porous ZIF-8 shell. The CuFe2O4nanoparticles (NPs) were first prepared in the presence of CNC and dispersant. Ag NPs were then deposited on the CuFe2O4/CNC composites via an in situ reduction directed by dopamine polymerization (PDA). The CuFe2O4/CNC@Ag@ZIF-8 nanocomposite was characterized by TEM, FTIR, XRD, N2adsorption-desorption isotherms, VSM, and XPS. Catalytic studies showed that the CuFe2O4/CNC@Ag@ZIF-8 catalyst had much higher catalytic activity than CuFe2O4@Ag catalyst with the rate constant of 0.64 min−1. Because of the integration of ZIF-8 with CuFe2O4/CNC@Ag that combines the advantaged of each component, the nanocomposites were demonstrated to have an enhanced catalytic activity in heterogeneous catalysis. Therefore, these results demonstrate a new method for the fabrication of CNC-supported magnetic core-shell catalysts, which display great potential for application in biocatalysis and environmental chemistry.Keywords:CuFe2O4nanoparticles;cellulose nanocrystals;Ag nanoparticles;ZIF-8 catalysis;4-nitrophenol reduction
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DOI
PubMed
高影响因子
Battery Energy
·
2025
·
IF 9.9
Yuzhen Zhao,Dongliang Yang,Yinfu Lu,Kexuan Li,Zhun Guo,Jianjing Gao,Ruijuan Yao,Dong Wang,Yi Luan,Hong Gao
Cholesteric liquid crystal (CLC) materials with broadband reflective properties have garnered much attention because of their light-selective reflective properties. In this study, broadband reflective films were prepared by doping a novel UV absorber, ZIF-8, into a CLC system to take advantage of the formation of a UV intensity gradient. The effects of ZIF-8 content, C6M content, UV intensity, UV irradiation time, and diffusion temperature on the reflection bandwidth of the samples were systematically investigated. The reflection bandwidth was expanded from 277 to 429 nm under optimum conditions. In addition, the ZIF-8-doped broadband reflective films not only have IR thermal control and UV shielding capabilities but also have the optical property of third-order nonlinear saturable absorption, which makes the preparation of multifunctional broadband reflective films possible. The above results show that the developed thin films have a broad application prospect in building energy saving, UV protection, and laser protection.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Jiangnan Wang,Long Li,Jinli Zhang,Xueqin Li
The construction on the interconnected network can be considered as a potential strategy for boosting CO 2 transport in mixed matrix membranes (MMMs). In this study, poly (ionic liquids)/ZIF-8 (PIL/ZIF-8) was synthesized and incorporated into sulfonated poly (ether ether ketone) (SPEEK) matrix to fabricate MMMs for rapid CO 2 transport. Wherein, ZIF-8 with a highly porous framework within PIL/ZIF-8 can efficiently capture CO 2 and allow CO 2 simultaneously transport in multi routes, thus improving CO 2 separation performance of SPEEK/PIL/ZIF-8 MMMs. PIL in PIL/ZIF-8 can guide the rapid transport of CO 2 in an orderly manner with the help of the anion CO 2 carriers (Cl − ) on the PIL chains, accelerating CO 2 transport in the MMMs. And the interconnected network was constructed by incorporating PIL/ZIF-8 in MMMs, which was endowed with the excellent CO 2 separation performance. And the CO 2 permeability and CO 2 /CH 4 selectivity of SPEEK/PIL/ZIF-8-7 MMM were 1641 ± 41 Barrer and 32 ± 0.9, respectively, approaching the 2019 upper bound. It implied that the construction on the interconnected network in MMMs had great potential for rapid CO 2 transport.
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产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 9
·期 1
·165-178
·
IF 6.569
Ning Yang,Linjie Lu,Linhua Zhu,Peiwen Wu,Duanjian Tao,Xiaowei Li,Jiahong Gong,Linlin Chen,Yanhong Chao,Wenshuai Zhu
Porous ionic liquids (PILs), with permanent porosity and fluidity, have been drawing great attention in theoretical research and application. Herein, a novel PIL (HPMo@ZIF-8-PIL) was fabricated by dispersing a phosphomolybdic acid-modified zeolitic imidazolate framework-8 (ZIF-8) into an ionic liquid for deep reactive extraction desulfurization. Size calculation results show that 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonylimide) ([Emim][NTf2]) with larger ion sizes cannot occupy pores of ZIF-8. In detail, the structure along with permanent porosity was well characterized by gas absorption and molecule displacement experiments, and it was found that HPMo@ZIF-8-PIL can not only promote the dispersion of the catalytically active sites but also retain the good liquidity and excellent extraction ability of ionic liquids. At room temperature, 100% removal of dibenzothiophene sulfur in a model oil could be achieved within 2 h using HPMo@ZIF-8-PIL and hydrogen peroxide as the catalyst and oxidant, respectively. Besides, the successful preservation of porosity increases the probability of contact between the oxidant and active sites, which is also in favor of the promotion of desulfurization performance. This work offers a new method for the modification of porous frameworks to construct PIL catalysts, which will provide a new insight into the application of PILs.
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高影响因子
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