JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Yirong Xiao,Wentian Zhang,Yang Jiao,Yanchao Xu,Hongjun Lin
A continuous and ultra-thin metal-phenolic network top layer on a polyethersulfone substrate surface was used as metal precursor for a metal-organic framework (MOF) membrane synthesis. A plant polyphenol tannic acid (TA) and Zn 2+ based network top layer prepared by a layer-by-layer (LBL) self-assembly process was immersed into a 2-methylimidazole aqueous solution, and then a ZIF-8 top layer was facilely formed due to the partial self-conversion of TA-Zn 2+ network to ZIF-8. The LBL process provides sufficient controllability of preparing a continuous and ultra-thin ZIF-8 top layer, which are crucial factors for nanofiltration membrane separation performance. The optimized ZIF-8 membrane exhibited a pure water permeance (PWP) of 5.1 L m −2 h −1 bar −1 , a 55.2% NaCl rejection and a 93.6% Na 2 SO 4 rejection. This is one of the few MOF membranes that possesses a divalent inorganic salt rejection higher than 90%. The novel zinc source of ZIF-8 synthesis disclosed in this study can provide a new incentive to not only MOF membrane preparation but also engineering MOFs towards a wide energy and environmental applications.
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BIOSENSORS & BIOELECTRONICS
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2021
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IF 10.618
Yong-Qiang He,Yu Gao,Hui-Wen Gu,Xian-Zhu Meng,Hong-Chao Yi,Ying Chen,Wei-Yin Sun
In this work, a sensitive electrochemical method for bleomycin (BLM) determination was reported on the basis of BLM-mediated activation of Zn 2+ -dependent DNAzyme and the adsorption of signal probes by a metal-organic framework (MOF) modified electrode . Two hairpin DNAs were employed in this protocol, one (HP1) for BLM recognition and one (HP2) for amplified signal output. The presence of BLM and Fe 2+ caused the formation of BLM-Fe (II) complex to cleave HP1, releasing DNAzyme fragments, which could further hybridize with substrate HP2 to form a partial double-stranded DNA duplex and enable the activation of Zn 2+ -dependent DNAzyme with the coexistence of Zn 2+ . The Zn 2+ -dependent DNAzyme catalyzed the cyclic cleavage of magnetic beads (MB)-immobilized HP2 to release massive DNA fragments with a Fc-labeled- terminal, which could be used for BLM quantification through electrochemical measurement after their adsorption on a MOF modified electrode. Attributing to the high catalytic efficiency of DNAzyme and excellent electrochemical performance of MOF modified electrode, our method revealed an impressive limit of detection as low as 4 pM BLM with a linear range of 5–2000 pM. Besides, the easy synthesis of MOF without further modification and the easy way of adsorption for signal achievement facilitated the operation process. In virtue of the high sensitivity, selectivity and the simple-to-implement features, this method is believed to hold a great promising application for BLM determination in biomedical and clinical study.
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INORGANIC CHEMISTRY COMMUNICATIONS
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2021
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IF 2.495
Jingwen Jia,Longfu Wei,Fang Li,Changlin Yu,Kai Yang,Tongxiang Liang
Two-dimensional metal–organic frame (2D MOF) materials have attracted great attention due to the successful combination of the unique properties of MOF and chemical properties of 2D material. In this paper, NiFe MOF/NF with a two-dimensional layered vertical structure were prepared by bottom-up solvothermal method. We used different solvent mixtures (methanol/water, ethanol/water, acetone/water, N, N-dimethylformamide/water) to control the synthesis of MOF and found that the oligpolar solvent mixture of acetone and water was the best in controlling the formation of these two-dimensional MOFs. The obtained NiFe MOF/NF in acetone/water appeared the best performance as electrocatalyst for the oxygen evolution reaction, in which the NiFe MOF/NF delivered a current density of 50 mA·cm −2 at a low overpotential of 270 mV with a small Tafel slope of 55 mV·dec -1 . In addition, NiFe MOF/NF has an excellent stability at a high current density of 100 mA·cm −2 .
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MATERIALS RESEARCH BULLETIN
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2021
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IF 4.641
Guang Xu,Ying Zhang,Dandan Peng,Donghai Sheng,Yao Zhang,Ye Tian,Di Ma
In this paper, carbon modified porous TiO 2 mixed-phase junction was successfully fabricated by using the MIL-125(Ti)-P25 composite as the precursor. The porous TiO 2 possessed abundant pores and large surface area inherited from its precursor during a simple one-step pyrolysis in a crucible, and the modified TiO 2 showed catalytic activity for photocatalytic cyclohexane oxidation. Moreover, the ratios of anatase/rutile TiO 2 and carbon contents in the modified TiO 2 mixed-phase junction can be regulated conveniently. Among the mixed-phase porous TiO 2 , the C TiO 2 –4 sample containing 12.4 wt% rutile TiO 2 presented the best photocatalytic activity, which was also much better than those of carbon modified pure anatase or rutile TiO 2 . The carbon modification was characterized by carbon doping and surface carbon species, which played the vital role in enhancing the photocatalytic activity of the mixed-phase TiO 2 . Carbon doping into TiO 2 lattice can effectively reduce its band gap energy and extend the light response range. The carbon species on the TiO 2 surface can improve the light absorption efficiency and promote the transport of photogenerated electrons. Free radicals capture experiments demonstrated that •OH and •O 2 − radicals were important active species in the cyclohexane oxidation reaction. This work provides a MOF-mediated P25-assisted synthesis strategy that may guide the design of other photocatalysts.
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INORGANIC CHEMISTRY COMMUNICATIONS
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2021
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IF 2.495
Haihong Xia,Jing Li,Changzhou Chen,Dichao Wu,Jurong Ren,Jianchun Jiang,Minghao Zhou
Metal-organic frameworks (MOFs) as an emerging class of porous materials exhibit some unique advantages, including controllable composition, a large surface area, high porosity, and so on. In this work, the spherical NiMo bimetal catalysts supported on porous carbon matrix were prepared using a simple wet impregnation method and studied for selective hydrogenation of furfural (FFA). Three different catalysts were investigated including Ni/C-Mo-BTC, Ni/C-Mo-DHTA and Ni/C-Mo-PTA. Of the catalysts studied the Ni/C-Mo-BTC catalyst could achieve the highest selectivity of CPL (up to 90%) under moderate reaction conditions (140 °C, 2 MPa, 2 h) in aqueous medium. In addition, other Ni-based catalysts (Ni/C-Fe, Ni/C-Zn, Ni/C-Cu, Ni/C-Ce) were also investigated to achieve yields of 20–70% under the same reaction conditions. The influence of temperature, H 2 pressure, time and solvent were investigated for the best performing catalyst. Based on the optimal reaction condition, various of furfural derivatives could also be effectively transferred to produce corresponding products. The detailed physicochemical characterization was carried out by means of XRD, SEM, TEM, XPS, NH 3 -TPD and Raman analysis. In the end, the optimal Ni/C-Mo0.4 catalyst could be recycled magnetically and efficiently applied in the next run for five consecutive recycling tests in the FFA hydrogenation to CPL. The results suggested Ni/C-Mo0.4 catalyst occurred to increasingly favor the formation of Ni-Mo alloys and suggested a metallic active site in FFA hydrogenation with the addition of element Mo. Mechanism study indicated that water was a key factor contributing to the formation of different desired products, which was responsible for the arrangement of furan compound.
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RSC Advances
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2021
·Vol. 11
·期 14
·8117-8123
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IF 3.361
Qiuyun Zhang,Dandan Lei,Qizhi Luo,Xianju Yang,Yaping Wu,Jialu Wang,Yutao Zhang
In this study, a series of nanoporous HSiW@ZrO2 hybrids were synthesized using a zirconium metal–organic framework UiO-66 as a precursor towards biodiesel production. The structural and morphological properties of the obtained hybrids were characterized by the wide-angle XRD, FTIR, SEM, TEM, N2 adsorption/desorption, and NH3-TPD methods. Moreover, their catalytic activity in terms of calcination temperature during preparation was investigated, and the HSiW@ZrO2 hybrids calcinated at 300 °C exhibited the highest activity and the oleic acid (OA) conversion of 94.0% owing to the presence of the relatively high surface area, appropriate pore size and strong acidity. It was also revealed that the hybrids maintained as high as 82.0% even after nine cycles. Intriguingly, the nanoporous catalysts were found to exhibit excellent catalytic activity towards the esterification of the high acid value of Jatropha curcas oil.
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MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Wenhu Yang,Hao Guo,Rui Xue,Xin Zhao,Qixia Guan,Tian Fan,Longwen Zhang,Fan Yang,Wu Yang
Selenides derived from MOFs have attracted attention as the materials with excellent electrochemical properties. CNT/MOF-74 composites are successfully synthesized by a simple hydrothermal method. Then CNT/Ni-MOF-74 materials are selected as the precursors for further selenization to prepare CNT/NiSe x . The results show that 0.2CNT/NiSe x derived from CNT/Ni-MOF-74 prepared in the presence of 0.2 g CNTs has the best electrochemical performance as electrochemical capacitor electrode, which exhibits the highest specific capacitance of 2136 F·g −1 at a current density of 1 A·g −1 . In addition, a hybrid electrochemical capacitor (HEC) is assembled with 0.2CNT/NiSe x and activated carbon (AC). The obtained 0.2CNT/NiSe x //AC HEC shows a high energy density of 59 Wh·kg −1 at a power density of 800 W·kg −1 . In order to expand the application of the composition material, a 0.2CNT/NiSe x /GCE electrochemical sensor is prepared. The results show that 0.2CNT/NiSe x /GCE electrochemical sensor can be used for simultaneous determination of acetaminophen (AMP) and dopamine (DA).
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 48
·25687-25695
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IF 11.301
Lei Li,Guilin Li,Yaping Zhang,Wenjun Ouyang,Huiwen Zhang,Feifei Dong,Xuehui Gao,Zhan Lin
Water splitting by electrolysis is a promising technology that can address rising energy demands and environmental pollution. However, the oxygen evolution reaction (OER), as one half-cell reaction of water splitting, always suffers from slow kinetics and a large overpotential due to the four proton-coupled electron transfer process, and dominates the overall process efficiency. IrO2 is a promising and widely used catalyst for the OER in commercial applications. Herein, we obtained low-crystalline nano-IrO2 particles confined in an amorphous Ir-based MOF (IrO2@Ir-MOF) through a simple solvothermal reaction, in which ultrafine IrO2 particles are uniformly distributed in the Ir-MOF skeleton. The fabricated IrO2@Ir-MOF-ppy electrode exhibits excellent OER activity with an overpotential of 207 mV, to achieve a current density of 10 mA cm−2 in 1 M KOH solution, outperforming most previously reported OER catalysts. The IrO2@Ir-MOF‖IrO2@Ir-MOF couple exhibits promising activity and stability for the overall water splitting reaction in 1 M KOH (1.53 V).
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APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
Wanyi Xie,Yanzi Wang,Jie Zhou,Meng Zhang,Jiali Yu,Caizhen Zhu,Jian Xu
In this work, a MOF-derived Co-Fe oxide porous nanorod is introduced into the freestanding MXene film to produce a high-performance flexible electrode with excellent deformability and editability. The as-prepared composite film electrode demonstrates several advantages: MXene layer functions as a binder and conductive additive to coat Co-Fe oxide, which can effectively facilitate charge transfer and maintain the excellent flexibility of the film electrode. In the meantime, Co-Fe oxide can work as a spacer, thereby expanding the interlayer distance, improving the ion transmission path in the electrode. As a result, the optimal Co-Fe oxide/Ti 3 C 2 T X composite paper manifests a remarkable volumetric capacitance of 2467.6 F cm −3 in 1 M LiCl electrolyte. When assembled into a flexible symmetrical supercapacitor, an outstanding specific areal capacitance of 356.4 mF cm −2 can be obtained. Meanwhile, the flexible supercapacitor demonstrates excellent cycling performance with a high capacitance retention of 88.2% after 10 000 charge/discharge cycles, as well as stable electrochemical energy storage stability after 100 cycles of mechanical bending, indicating its great application potential in future flexible and portable energy storage equipment.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2020
·Vol. 412
·期 26
·7227-7236
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IF 3.637
Li Jie,Ma Miaoxia,Zhang Chenhui,Lu Rui,Zhang Lingyi,Zhang Weibing
A molecularly imprinted polymer and metal organic framework were combined to prepare protein imprinted material. MOF-74(Ni) was used as a matrix to prepare surface-imprinted material with lysozyme as a template and polydopamine as an imprinting polymer. MOF-74(Ni) not only provides a large surface area (150.0 m 2 /g) to modify the polymer layer with more recognition sites ( Wt (Ni) = 42.24%), but also facilitates the immobilization of lysozyme by using the chelation between Ni 2+ of the MOF-74(Ni) and protein. The thin polydopamine layer (10 nm) of the molecularly imprinted material (named MOF@PDA-MIP) enables surface imprinting. Benefiting from the thin polymer layer, MOF@PDA-MIP reached adsorption equilibrium within 10 min. The maximum adsorption capacity reaches 313.5 mg/g with the highest imprinting factor (IF) of 7.8. The specific recognition sites can distinguish target lysozyme from other proteins such as egg albumin (OVA), bovine serum albumin (BSA) and ribonuclease A (RNase A). The material was successfully applied to separation of lysozyme from egg white.
Graphical abstract
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
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IF 7.1
Yingxia Zhou,Lai Wei,Lihua Chen
Herein, a small molecule, hemin/G-quadruplex (G4-hemin), was physically embedded into NH 2 -MIL-53 (Al) to construct a novel metal-organic framework (MOF)-based enzyme ( [email protected] ). Its catalytic activity and stability were investigated in detail by catalyzing a reaction of 3,3′,5,5′-Tetramethylbenzidine (TMB) in the presence of H 2 O 2 . The results show that the activity and stability of this new enzyme is better than that of traditional hemin or G4-hemin, and even stronger than that of [email protected] ( [email protected] > G4-hemin > [email protected] > hemin). No significant loss in catalytic activity was observed for at least one day. Even after eight days, only a 13.8 % decrease in activity was recorded. An electrochemical biosensor was successfully developed based on a signal amplification strategy utilizing the catalysis of [email protected] The sensor was able to sensitively detect TB in buffer, even in a diluted solution of many proteins. The proposed method offers high selectivity against mismatch sequences of TB, a good linear response range of 10 −18 moL L -1 to 10 -14 moL L -1 and a low minimum detection limit of 0.330 aM.
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ACS Applied Materials & Interfaces
·
2020
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IF 8.758
Xinyu Chen,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Oily wastewater, often containing heavy metal ions, is a common source of water pollution. In this study, a modified-MOF-loaded polyacrylonitrile membrane was designed and prepared via solvothermal reaction and electrospinning to simultaneously separate oil-in-water emulsions and adsorb heavy metal ions. The membrane shows superhydrophilicity and superoleophilicity in air and underwater superoleophobicity, which enables the membrane to efficiently separate various oil-in-water emulsions. The strong adsorption capacity of MOF-808 allows this membrane to adsorb heavy metal ions at various concentrations in a short time. The separation efficiency reached 99.97%, and the highest removal efficiency of heavy metal ions reached 97.7%. Additionally, the membrane demonstrated excellent recyclability and corrosion resistance. Overall, the membrane is highly efficient in treating wastewater, and it has great potential for practical applications.
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