ACS Applied Nano Materials
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2022
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IF 6.14
Zhoumei Xu,Fukai Chu,Xiaoyu Luo,Xin Jiang,Liang Cheng,Lei Song,Yanbei Hou,Weizhao Hu
In order to separate heavy-metal ions from contaminated wastewater and further realize the reutilization of waste adsorbent, magnetic composites with flowerlike structure were successfully synthesized. After the absorption of Cu2+ ions, hybrids can be used as effective coatings to enhance the fire safety of flexible polyurethane foam (FPUF) through a dip-coating method. As-fabricated metal–organic framework (MOF)-based composites exhibited a core–shell and flowerlike structure with high thermal stability. The maximum adsorption capacity for Cu2+ could reach 292.13 mg·g–1, calculated from the Langmuir isotherm model. In order to reutilize the adsorbed Cu2+ ions, the CuO-loaded MOF-derived Fe3O4@ZnO@CuO (MO) was obtained with a simple heat treatment. The effectivity of MO as a fire-safety coating for inhibiting the release of heat and toxic gases of FPUF was satisfactory. The application of this MOF-based composite will provide useful insights into the design of bifunctional materials for efficient wastewater remediation and fire-safety coatings.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2022
·Vol. 169
·期 6
·060547
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IF 4.386
Ruixiang Wang,Yanyang Wang,Zheqin Chen,XiaoCong Zhong,Yongmin Xie,Xiaobo Ji,Jiaming Liu,Shubiao Xia,Zhifeng Xu
Transition metal/nitrogen carbon composite (M/NC) is a highly active oxygen reduction reaction (ORR) electrocatalyst, widely used in fuel cells and zinc-air batteries. Herein, a uniform and regular PVP-assisted iron-doped nano dodecahedron (ZP0.1F/NC) is prepared by a simple and efficient one-step in-solution reaction, followed by controlled in situ pyrolysis. The synthesized electrocatalyst showed excellent electrocatalytic ORR activity in an alkaline medium. Compared with standard 20% Pt/C electrocatalyst, ZP0.1F/NC exhibited onset potential (Eonset) (0.974 V vs 0.967 V), half-wave potential (E1/2) (0.861 V vs 0.857 V) and the limiting current density (jd) was 6.373 mA cm−2 vs 5.401 mA cm−2, also better than the Fe doped ZIF-8 nitrogen composite (ZF/NC), PVP auxiliary ZIF-8 (ZP0.1/NC) and pure ZIF-8 nitrogen composite (Z/NC) synthesized by the same procedure. In addition, the zinc-air battery assembled with ZP0.1F/NC also exhibits outstanding discharge capacity, with a specific capacity and energy density of 793.3 mAh g−1 and 974.9 Wh kgZn−1, respectively, much higher than that of commercial 20% Pt/C-based zinc-air battery (719.8 mAh g−1, 842.6 Wh kgZn−1), indicating its great potential in practical energy conversion and storage.
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Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Mengyue Zhou,Dong Guo,Zhigang Tang,Ullah Shafqat
Nowadays, Carbon capture and storage (CCS) are widely studied as a way of reducing greenhouse emissions and slowing down global warming . Integrated solvent absorption-membrane desorption is a novel CO 2 pre-combustion capture technology with the advantage of relatively low energy cost. Herein, the mixed matrix membranes (MMMs) were synthesized through a facile in-situ method for enhanced desorption of CO 2 from dimethyl carbonate (DMC). ZIF-8 nanoparticles were synthesized in situ on polydimethylsiloxane (PDMS). The morphology, microstructure and thermal stabilities were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and thermal gravimetric analyzer (TGA). Results revealed that fabrication of ZIF-8 nanoparticles on PDMS matrix greatly increased CO 2 flux of the membrane without any leakage of DMC. The membrane showed superior performance with increase of temperature and feed pressure. In particular, PPM-4 exhibited the highest CO 2 flux of 2670 g/ m 2 ·h at 0.4 MPa (20 °C) with the feed flow rate of 0.8 L/min. It was found that the use of DMC absorption-PDMS membrane desorption technology significantly reduces the cost of CO 2 capture. The enhanced performance of this combination of a new absorbent and mixed matrix membranes will open new routes for future CO 2 capture systems.
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ENVIRONMENTAL RESEARCH
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2021
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IF 6.498
Rui Luo,Junwen Wu,Jing Zhao,Dong Fang,Zongtang Liu,Lin Hu
The non-radical oxidation processes of persulfate activation by carbon materials have shown great potential for industrial and saline wastewater treatment . Recently, metal-organic frameworks (MOFs) as an emerging precursor have been widely used for fabricating functional carbon materials. Herein, we reported ZIF-8 derived defect-rich nitrogen-doped carbon (ZCNs) via NaCl-assisted pyrolysis for efficient non-radical activation of peroxydisulfate to degrade rhodamine B (RB). All samples exhibited excellent catalytic activity , and ZCN-900 (pyrolyzed at 900 °C) was found to be the most active, able to degrade 96 % of RB quickly within 10 min. Quenching tests and electron paramagnetic resonance (EPR) analyses suggested that the singlet oxygen ( 1 O 2 ) dominated the degradation process by a non-radical pathway. Furthermore, the effect of anions and water quality on RB oxidation were investigated, and ZCN-900/PDS system showed great resistance to the anions and natural organic matters (NOM). This work may provide a significant addition to MOF-based functional materials for environmental remediation based on the results above.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Cheng Cheng,Jian Wang,Zhihao Zhao,Changchun Chen,Sheng Cui,Yifeng Wang,Lin Pan,Yaru Ni,Chunhua Lu
Semiconductor catalyst with high photocatalytic activity can be exploited via heterojunction. In this study, a new S-scheme SrTiO 3 /porous ZnO composite was rationally devised, successfully prepared by utilizing a two-step pyrolysis of SrTiO 3 /ZIF-8, and analyzed by various characterization technologies including XRD, SEM, TEM, BET, XPS, PL, UV–vis DRS, and photoelectrochemical and DFT theoretical calculations. A porous structure, tight contact, and a heterojunction formed between SrTiO 3 and porous ZnO (ZnOT) can be observed by SEM and TEM images. BET testing indicates that the SrTiO 3 /porous ZnO composite (S3ZT) shows the highest specific surface area (30.37 m 2 /g). The band gap values (E g ) of SrTiO 3 and ZnOT are around 3.17 and 2.95 eV, which agree with those obtained from DFT calculations. Compared to other samples, the SrTiO 3 /porous ZnO composite (S3ZT) shows higher light absorption and lower transfer resistance as demonstrated by UV–vis DRS and EIS results. S3ZT presents a superior photocatalytic efficiency of 48.8% in degrading 5 mg/L methyl orange (MO) irradiated by 1 h UV–vis light, which are 7- and 1.5-fold higher than pristine SrTiO 3 and ZnOT, respectively. Moreover, based on Mott-Schottky theory, active species trapping experiments, XPS determination, and DFT calculations (energy band gap and work function), it was shown to be reasonable to utilize the S-scheme charge migration process for an explanation regarding the better photocatalytic activity of SrTiO 3 /porous ZnO composite. Overall, this work will provide an effective protocol for devising and preparing semiconductor photocatalysts with S-scheme heterojunction by utilizing the superior characteristics of MOFs.
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APPLIED SURFACE SCIENCE
·
2021
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IF 6.707
Jinchang Xu,Guofeng Liang,Di Chen,Zilong Li,Hao Zhang,Jian Chen,Fangyan Xie,Yanshuo Jin,Nan Wang,Hui Meng
H 2 -O 2 proton exchange membrane fuel cells (PEMFCs), one of the applications of hydrogen energy with specific energy density of 143 MJ/kg, might be a promising alternative to replace the use of fossil energy. The key to accelerate the application of PEMFCs is to design an efficient non-precious metal catalyst to lower the overpotential of the cathode oxygen reduction reaction (ORR). Herein, we developed a novel iron and nitrogen doped carbon (FeNC) catalyst using ferrocene as iron source, ZIF-8 as organic framework as well as the main carbon source. The regular morphology of ZIF-8 and ferrocene can prevent active sites from agglomeration, resulting a homogenous distribution of Fe, N and C. Moreover, the high specific area, porous structure and abundant catalytic Fe and N species gave rise to the ORR performance of the catalyst. As a result, the as-prepared FeNC catalyst showed an onset and half-wave potential of 0.95 V and 0.78 V in 0.1 M HClO 4 with 1600 rpm, respectively. The catalysts were also applied in a PEMFC as the cathode catalysts with an open circuit voltage of more than 0.9 V and a maximum power density of 601 mW/cm 2 . Additionally, the as-prepared FeNC-1:30 catalyst showed a current density of 380 mA/cm 2 at 0.7 V, which outperformed other as-prepared catalysts.
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JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Zenghui Mai,Senqing Fan,Yilin Wang,Jiaojiao Chen,Yu Chen,Ke Bai,Lei Deng,Zeyi Xiao
An Ag@PAN catalytic nanofiber composite membrane has been fabricated by combining electrospinning PAN nanofiber seeding with 2-MI and flowing synthesis. ZIF-8 can be immobilized on the surface of the nanofibers with Zn(NO 3 ) 2 solution flowing through the 2-MI/PAN nanofiber membrane and Ag nanoparticles can be immobilized on the nanofibers with Zn 2+ in ZIF-8 exchanged by Ag + followed with reduction reaction. The characteristics of XRD , XPS , FTIR, TGA, HRTEM , and BET proved the successful immobilization of Ag nanoparticles derived from ZIF-8 on PAN nanofiber. The permeance of the Ag@PAN catalytic nanofiber composite membrane can reach 19,227 L m −2 h −1 bar −1 with Ag nanoparticles immobilization amount of 49.64%. The p -NP conversion reaction is addressed for the catalytic performance of the Ag@PAN catalytic nanofiber composite membrane. The conversion rate of 99% can be achieved under the condition of p -NP concentration of 0.025 mM and membrane flux of 300 L m −2 h −1 . The apparent reaction rate constant of 236.63 min −1 can be achieved by flowing through mode, which is 4-5 orders of magnitude higher than that in a stirred tank reactor with Ag powders as the catalyst. The catalytic performance of the composite membranes has not declined significantly after ten cycles of the catalysis experiment, implied the good repeatability of the Ag@PAN catalytic nanofiber composite membranes.
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Analytical Methods
·
2021
·Vol. 13
·期 20
·2338-2344
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IF 2.896
Hexiang Li,Fawei Zhu,Jun Xiang,Fangbin Wang,Qi Liu,Xiaoqing Chen
We herein report a facile and scalable strategy for the fabrication of a metal–organic framework (MOF) based composite by in situ growing ZIF-8 on gold nanoparticle (AuNP) loaded magnetic carbon nanotubes (mCNTs). AuNPs were firstly loaded on PEI (polyethylenimine) modified mCNTs by electrostatic forces, and then AuNPs/mCNTs were encapsulated into the ZIF-8 frame through in situ self-assembling of zinc ions and 2-methylimidazole. The morphology, spectroscopy and structural properties of the AuNP/mCNT@ZIF-8 nanocomposites were systematically characterized. The conductivity–strain tests revealed that the in situ insertion of AuNPs/mCNTs in ZIF-8 could not only shorten the electron transfer distance between active sites and mCNTs, but also increase the dispersion of mCNTs, which would benefit the electron and mass transfer. Besides, by adopting the AuNP/mCNT@ZIF-8 nanocomposite-modified glassy carbon electrode (GCE) as the working electrode, a novel electrochemical sensor was successfully developed for the detection of bisphenol A (BPA). A linear range of BPA detection from 1 μM to 100 μM with a limit of detection of 690 nM was favorably obtained. Moreover, the developed sensor exhibited satisfactory reproducibility and superior stability with excellent anti-interference ability, and was successfully applied in the detection of BPA in real samples.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Qiuchen Wang,Yan Dai,Xuehua Ruan,Wenji Zheng,Xiaoming Yan,Xiangcun Li,Gaohong He
Carbon nanotubes (CNTs) with 1D gas transport channel has great prospect in MMMs based CO 2 separation. However, the insufficient compatibility with polymer and inner diameter of CNTs limit further improvement of their CO 2 separation performances. In this work, the unique ZIF-8 hollow nanotubes (HNTs) were proposed to construct high-speed gas transmission channel in MMMs by a three-step method (electrospinning-calcination-hydrothermal), aiming at concurrently improving the gas permeability and selectivity. The hollow inner cavity provides long-range and low-resistance gas transmission channels to ensure high gas permeability. At the same time, the ZIF-8 crystals composing the tube wall can not only screen for gas molecules pair, but also strengthen the affinity between the filler and polymer matrix by its organic ligands, thus the gas selectivity can be raised. Compared with ZIF-8 nanoparticles and ZnO HNTs, ZIF-8 HNTs based MMMs present competitive CO 2 separation. When the loading of ZIF-8 HNTs is 5 wt%, the gas separation performance shows the best, in which the CO 2 permeability is 147 Barrer and the CO 2 /N 2 selectivity is 68, approaching to the 2008 Robeson upper limit and surpassing most reported CNTs/Pebax based membranes. Therefore, the proposed ZIF-8 HNTs are promising for MMMs based CO 2 separation.
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高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 7
·4167-4175
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IF 12.732
Haoyu Li,Peng Mu,Jian Li,Qingtao Wang
Purification of highly emulsified oily wastewater is of significance but challenging due to the critical limitations of low efficiency and serious membrane blocking. Herein, inspired by the desert beetle's capability of water-collection in air, we first constructed an inverse desert beetle-like membrane to achieve oil capture in water, thus improving the separation performances of the surfactant-stabilized oil-in-water emulsion. The as-prepared nanofibrous membrane consists of hydrophobic/oleophilic ZIF-8 bumps and underlying underwater superoleophobic polyacrylonitrile (PAN), and possesses a similar structure to desert beetles but with opposite wettability. In the process of emulsion demulsification, besides the sieving effect of the underlying traditional underwater superoleophobic PAN membrane, the bumpy oleophilic ZIF-8 particles of the composite membrane can capture oil, thus strengthening the demulsification ability of the membrane. Furthermore, the separation efficiency of the inverse desert beetle-like membrane is up to 99.92% for surfactant-stabilized oil-in-water emulsion, which is superior to that of traditional single underwater superoleophobic PAN membranes lacking the hydrophobic bump structure. Moreover, for light oil-in-water emulsion, the permeation flux also increases because the captured tiny oil droplets can aggregate subsequently and grow large enough to detach from the underlying surface which greatly reduces the incidence of filter cake formation and congestion. This inverse desert beetle-like membrane opens up new avenues for designing advanced membranes in the oil/water emulsion separation field.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
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IF 4.65
Rui Li,Wei Li,Chun Jin,Qinyu He,Yinzhen Wang
ZIF-8@TiO 2 micron composite, one kind of new high-efficiency photocatalyst was prepared by hydrothermal method in this work. We compared the ability of ZIF-8, TiO 2 nanospheres and ZIF-8@TiO 2 to catalytically degrade tetracycline. The results of the characterization show that the TiO 2 nanospheres grow uniformly on the surface of ZIF-8, and ZIF-8 and TiO 2 are linked together by chemical bonds. The synergistic effect of ZIF-8 and TiO 2 greatly enhances the catalytic ability of the composite photocatalyst. In ZIF-8@TiO 2 micron composite, ZIF-8 provides a new way for photogenerated electron transfer as a charge separator, to reduce the charge recombination rate. Since the hybrid combines the advantages of ZIF-8 and TiO 2, ZIF-8@TiO 2 exhibits excellent ability to catalytically degrade tetracycline. The possible photocatalytic mechanism of the hybrid photocatalyst was also discussed.
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高影响因子
BIOSENSORS & BIOELECTRONICS
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2020
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IF 10.257
Qian Ren,Junsong Mou,Yanmei Guo,Huiqi Wang,Xiyue Cao,Feifei Zhang,Jianfei Xia,Zonghua Wang
A simple homogeneous electrochemical aptasensor was designed by using target-responsive substrate releasing from aptamer-gated zeolitic imidazolate framework-8 (ZIF-8)-derived porous carbon nanocontainer. The nanocontainer (Z-700) was prepared by calcination of ZIF-8 at 700 °C. Z-700 had great biocompatibility, high surface areas and pore volume , especially the graphene-like π-rich structure, which was beneficial for adsorbing aptamer easily. The electroactive dyes methylene blue (MB) was then trapped in the pores of Z-700 and easily capped with aptamer as gatekeeper based on π-stacking interaction. Upon addition of target protein thrombin (Thb), the Thb could specifically recognize and combine with its aptamer to form complex. Thereafter, the aptamer bio-gate opened and the MB released from the pores, which could be detected on the screen-printed electrode. Under the optimized conditions, the proposed Thb aptasensor showed a wide detection range from 1 fM to 1 nM with a low detection limit of 0.57 fM. The strategy by using ZIF-8-derived porous carbon and aptamer bio-gate provides a promising scheme for developing simple, rapid, reliable and ultrasensitive bioassays, which has a great potential as a powerful tool in disease diagnosis and biomedicine.
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高影响因子
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