JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Chen Zhe-qin,Zhong Xiao-cong,Xie Yong-min,Liu Jia-ming,Xu Zhi-feng,Wang Rui-xiang
Metal–air batteries have shown tremendous potential as devices for electrical energy storage and conversion; however, their commercial applications are limited owing to the high costs of precious metal catalysts. In this study, urea was employed as a dispersant and as an additional nitrogen source to synthesize zeolitic imidazolate framework-derived iron-nitrogen-carbon catalysts (ZIF-8-derived Fe-NCs). The fabricated nitrogen-rich catalyst was found to have a high specific surface area and numerous surface defects, while maintaining the original ZIF-8 morphology. Electrochemical analysis with a rotating ring-disk electrode revealed that the onset potential of nitrogen-rich Fe-NC was 0.91 V at 1600 rpm with a limiting current density of 5.38 mA·cm −2 , which indicated a high catalytic activity for the oxygen reduction reaction. Additionally, the decent stability of the catalyst was confirmed by a 2 h cycle test.
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高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 152
·期 2
·610-618
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IF 3.186
Zhou Junjie,Yan Jiaying,Meng Xu,Chen Weifeng,Guo Jianfeng,Liu Xiang
Abstract It is still a significant challenge to replace noble metal based catalysts by non-noble metal-based, highly efficient and earth-abundant catalysts in the H 2 generation upon hydrolysis of sodium borohydride. Herein, we first design and synthesize the highly selective and heterogeneous Co x W y nanocomposites from ZIF-67 as robust catalysts for H 2 production upon the hydrolysis of sodium borohydride. Among them, the Co 0.45 W 0.55 nanocatalyst exhibits the highest TOF of 1770 mL H2 g cat −1 min −1 (the TOF related to only cobalt nanoparticles 8401 mL H2 g Co −1 min −1 ) over pure ZIF-67 or W nanoparticles and other ones. In addition, the Co 0.45 W 0.55 catalyst has been successfully recycled at least 5 times without any significant activity loss, although the W (VI) has been partly reduced to W (V), W (IV) and W (0) in the hydrolysis of sodium borohydride. This stability is taken into account by the highly active Co species rather than the activity of W itself. Based on the results obtained, we have shown that Co 0.45 W 0.55 nanocomposite can be a potential candidate for the replacement of a noble metal catalyst for H 2 generation. Graphic Abstract
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Journal of CO2 Utilization
·
2021
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IF 7.132
Qin Ying,Han Chen,Peijing Shao,Xiaowei Zhou,Xiaojia He,Jiexu Ye,Shihan Zhang,Jianmeng Chen,Lidong Wang
Tertiary amine-based absorption process possesses high absorption capacity and low heat duty for CO 2 capture. However, its slow CO 2 absorption rate retards its industrial application. This work developed a core-shell magnetic ZIF-8@Fe 3 O 4 -carbonic anhydrase composite to promote CO 2 absorption into tertiary amine, e.g., diethanolamine (MDEA) due to its easy recovery from the solution. The catalytic performance of CA@ZIF-8@Fe 3 O 4 that had three particle sizes were investigated. Experimental results revealed that the obtained CA@ZIF-8@Fe 3 O 4 can achieve the relative activity as high as 95.2 % compared with the free counterparts. Large particle size of ZIF-8@Fe 3 O 4 was beneficial to activity but adverse to loading. Magnetic analysis shows that the developed CA@ZIF-8@Fe 3 O 4 possessed remarkable magnetic response which made recycling more convenient.
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ELECTROCHIMICA ACTA
·
2021
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IF 6.901
Xing Chen,Ji-Xing Zhao,Jia-Wei Wang,Yao Liu,Lian-Chao Wang,Rohan Weerasooriya,Yu-Cheng Wu
Development of robust methods for rapid detection of heavy metal ions and associated chemical species in water is challenging. Different mercury species are ubiquitous in the environment; they bio-amplify and undergo methylation into organo-Hg species. We developed a new electrochemical method for rapid screening of free Hg 2+ in water by square wave anodic stripping voltammetry (SWASV) on a metal-organic framework (MOF) platform using ZIF-67 as starting substrate. Bimetallic MOF structures were fabricated by doping iron, manganese or nickel ions into ZIF-67 using a facile NaOH treatment. The GCE was modified with Ni, Mn, or Fe doped ZIF-67 nanocomposites to enhance performance for Hg 2+ detection. When compared to pure ZIF-67/GCE, the Hg 2+ detection sensitivity by the metal ions-doped ZIF-67/GCE was increased by 260%. The detection limit was improved by 60%. The Fe doping on ZIF-67 (Fe x Co y ) significantly improves electroanalytical performance due to the formation of iron oxide on ZIF-67. The GCE modified with Fe 1 Co 1 nanocomposite showed the best performance for electrochemical detection of Hg 2+ . Besides, the cyclic voltammetry (CV) and electrochemical impedance spectrum (EIS) data also confirmed that Fe doping of the ZIF-67 enhanced the electron transfer rate at the solid-liquid interface. Hg 2+ detection and quantification at this new chemically modified sensing electrode were not interfered by Cd 2+ , Pb 2+ , and Cu 2+ . The Fe 1 Co 1 modified GCE is stable when used repeatedly for ten cycles. The spike recovery of 0.3 to 1.00 µM Hg 2+ with Fe 1 Co 1 modified GCE was always above 99.0%. The chemically modified sensor with Fe 1 Co 1 holds a promise in monitoring Hg 2+ at trace concentrations.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Guanyu Chen,Song He,Guibin Shi,Yuansheng Ma,Chichi Ruan,Xin Jin,Qilin Chen,Xinyu Liu,Huaming Dai,Xianfeng Chen,Dongmei Huang
Metal-organic framework (MOF) materials have been extensively studied in the removal of pollutants in wastewater. However, MOFs, which are usually in powder form, suffer from complex separation that hinder their practical application. Herein, a composite adsorbent material, [email protected] (wood aerogel), has been successfully fabricated through in-situ anchoring of ZIF-67 rhombic dodecahedron on the wood aerogel obtained by selectively removing lignin and hemicellulose from natural wood. WA with lamellar structure provided sufficient attachment sites for ZIF-67, and the content of ZIF-67 in the composite reached 32.65 wt%. ZIF-67 with 1 μm in grain size maintained its crystallinity when it was introduced to the surface of WA. The effects of pH, contact time, initial concentration, temperature, coexisting ions and humic acid on tetracycline (TC) adsorption were investigated. The composite showed excellent TC adsorption capacity (273.84 mg·g −1 at 298 K), which was comparable to most previously reported adsorbents. Pseudo-second-order kinetic model and Langmuir isotherm model described the adsorption process well. Adsorption thermodynamic studies implied that the adsorption process was spontaneous and endothermic. Furthermore, the possible adsorption mechanism was proposed. The TC removal efficiency dropped from 94.09% to 80.27% after 3 cycles, revealing the composite could be recycled. The leaching of cobalt was measured to be within the permissible range, indicating that no serious secondary contamination would be caused during using the composite. The superior adsorption performance coupled with compressibility, light weight and facile separation gave [email protected] the potential to effectively remove TC from water.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
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IF 4.464
Qing Wang,Zihan Zhang,Shaojie Shi,Fan Wu,Zhiguo Zhang,Guoneng Li,Yange Suo
In this work, highly active cobalt- and nitrogen-doped carbon (Co-N-C) materials were prepared for oxygen reduction reaction (ORR). The Co-N-C materials were synthesized through co-pyrolysis of ZIF-67 and melamine (ZIF-67@melamine). Detailed powder X-ray diffraction (XRD), fourier transform infrared (FTIR) spectroscopy and thermo-gravimentry (TG) analyses suggest melamine could accelerate the decomposition of the ZIF-67 framework. Compared with CoNC derived from pure ZIF-67, the CoNC- x C 3 H 6 N 6 materials derived from ZIF-67@melamine exhibit more carbon defects, larger BET specific surface area, higher content of pyridinic-N and graphitic-N, resulting in the enhanced activity of the CoNC- x C 3 H 6 N 6 samples. The onset potential of CoNC-0.5C 3 H 6 N 6 -700 catalyst towards ORR is 0.96 V (vs. RHE) and the half-wave potential is 0.87 V (vs. RHE), which are close to the state-of-the-art commercial Pt/C. Besides, the electrochemical stability of the CoNC-0.5C 3 H 6 N 6 -700 catalyst is much higher than that of commercial Pt/C.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Jingxian Hua,Chang Li,Hongxu Tao,Lei Wang,Eryue Song,Haiqian Lian,Chongqing Wang,Jinlong Jiang,Yichang Pan,Weihong Xing
Polymer coating post-treatment strategy of the zeolitic imidazolate framework (ZIF) membranes offers a versatile and feasible opportunity to restrict the intrinsic flexibility of ZIF framework and improve their gas separation performance. Herein, two different coating methods (Vacuum-assisted drip coating (VADC) and Static drip coating (SDC)) are utilized to prepare PDMS/ZIF-8 composite membranes based on ZIF-8 membranes with different compactness (high, medium and low-quality membrane) for investigating the effect of the contact area between PDMS layer and ZIF-8 membrane on C 3 H 6 /C 3 H 8 separation performance of PDMS/ZIF-8 composite membranes. The results reveal that the increase of the contact between PDMS layer and ZIF-8 membrane can enhance the contact confinement effect on the flexibility of ZIF-8 framework, resulting in a higher improvement of the separation performance for C 3 H 6 /C 3 H 8 of PDMS/ZIF-8 composite membranes with pressure. The prepared composite membrane based on VADC method showed a significant improvement in C 3 H 6 /C 3 H 8 separation factor (77–102) with slight increase in C 3 H 6 permeance (about 10%) at feed pressure of 7 bar. Moreover, this facile vacuum-assisted drip strategy attenuated the impact of the quality of ZIF-8 membranes on fabrication reproducibility of the composite membranes, which can withstand high pressure. Therefore, this work advances ZIF-8 membrane moving forward to industrial C 3 H 6 /C 3 H 8 separation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Wenkai Pei,Junyang Zhang,Haijian Tong,Mengna Ding,Fengyan Shi,Ruizhe Wang,Yuning Huo,Hexing Li
The serious problem from pollution of metal ions placed great pressure to global water ecosystem and human beings. Herein, a synergistic photocatalytic-photothermal system of integrated membrane for the removal and reutilization of aqueous Ag + ions was designed. The crystal of zeolitic imidazolate frameworks-67 (ZIF-67) stably grew on the graphene oxide (GO) membrane with the uniform distribution. In the ZIF-67/GO membrane, the adsorption and photo-reduction of Ag + ions on ZIF-67 crystals led to the deposition of Ag nanoparticles on the membrane surface, which facilitated the capture of visible light, suppressed the recombination of the electron-hole pairs and promoted the photothermal effect. Meanwhile, the high efficiency of photothermal conversion on GO substrate realized the water evaporation to concentrate the Ag + solution and inhibited the separation of photo-induced charges. The synergistic photocatalytic-photothermal route on ZIF-67/GO membrane provides a new sight for the recycle of metal ions for the future practical applications.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2020
·Vol. 2020
·期 36
·3466-3473
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IF 2.529
Yongcen Lin,Xue Dong,Lang Zhao
Graphical In this paper, a highly efficient nano-catalyst was synthesized using thiosalicylic acid modified ZIF-(1:2.5) as precursor, which was used to catalyze the reduction of 4-nitrophenol, methyl orange, methylene blue, and congo red. The catalyst shows excellent performance. Mesoporous catalyst S-ZIF-(1:2.5)@Ni x S y was prepared using ZIF-(1:2.5) as a precursor. These composite materials were characterized by using scanning microscope (SEM), transmission electron microscopy(TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and N 2 adsorption-desorption techniques, and studied as catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP), congo red (CR), methyl orange (MO), and methylene blue (MB). The BET specific surface area and pore volume of the catalyst were 167.49 m 2 /g and 0.32 m 3 /g respectively. The doping of S improves the catalytic performance of the catalyst. S-ZIF-(1:2.5)@Ni x S y showed an excellent catalytic rate ( k app = 22.3 × 10 –3 /s) in the experiment of reductive degradation of 4-NP. In addition, S-ZIF-(1:2.5)@Ni x S y also showed good catalytic activity for the degradation of CR, MB, and MO, completing the catalytic reaction within 60, 60, and 90 s, respectively. The k app values for CR, MB, and MO are 29.0 × 10 –3 /s, 44.0.0 × 10 –3 /s, and 29.2 × 10 –3 /s, respectively.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Wei Peng,Xiaoxiao Yang,Linchang Mao,Junhong Jin,Shenglin Yang,Jingjing Zhang,Guang Li
Developing highly active and robust bifunctional non-precious oxygen electrocatalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is of paramount importance for enhancing the efficiency of zinc-air battery. Herein, Co nanoparticles anchored in N doped hollow and porous carbon nanofibers (CoN-HPCNF) are obtained via an in-situ growth-pyrolysis approach with the hybrid of ZIF-67 and carbon nanofibers as the precursor. Originating from its high surface area, firm and hierarchical porous structure, effective doping of N as well as synergistic effect from Co nanoparticles and HPCNF, the optimized CoN-HPCNF shows prominent bifunctional catalytic activity and long-term stability toward OER and ORR. Importantly, the assembled aqueous zinc-air battery with the prepared catalyst as the air cathode delivers a peak power density of 126.6 mW cm −2 and narrow charge-discharge voltage gap together with excellent operation durability (more than 280 h at the current density of 5 mA cm −2 ), outdoing the commercial precious metal catalysts (Pt/C + IrO 2 ).
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Cong Yang,Wenjie Xu,Xin Meng,Xinlong Shi,Luhua Shao,Xiangliang Zeng,Zhenfei Yang,Sijian Li,Yutang Liu,Xinnian Xia
Giving the coating to exert a powerful active protective effect for metal substrates, such as self-healing property by encapsulating corrosion inhibitor into a pH-responsive release tool, is a crucial way to develop an efficient anticorrosive coating. Here, a pH-responsive hydrophilic controlled release system (BTA@ZIF-8@tannic acid, abbreviated ZBT) based on ZIF-8 for waterborne EP self-healing anticorrosive coating was reported. Encapsulation of BTA into ZIF-8 by a facile one-pot method and the resulting product showed a high loading percentage. The anticorrosion performance of composite coatings was studied by EIS, and the results indicated that ZBT could effectively enhance the protective performance of the coating and endow it with outstanding self-healing performance, in which the |Z| 0.01 Hz was about 2 orders of magnitude higher than that of pure EP coating after 20 days of immersion. The outstanding performance is related to the excellent compatibility of ZBT, the blocking effect of newly produced hydrophobic substances and the corrosion inhibitor and ferric tannate protective films formed on the exposed metal surface. In this work, tannic acid plays a role of killing two birds with one stone in enhancing the corrosion protection performance of the coating. This synergistic strategy opens a new possibility to fabricating excellent anticorrosive coatings with efficient self-healing functionality.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2021
·Vol. 47
·期 4
·1471-1487
·
IF 2.914
Zheng Wei,Feng Sheng,Feng Shanshan,Shao Cong,Jiang Zhenfei,Wu Wei,Ge Yunjie,Liao Shenyu,Li Kunjie,Duan Chunying,Meng Qi
In this work, a ternary complex (g-C 3 N 4 /ZIF-8/AgBr) was prepared by modifying the surface of the protonated graphitic carbon nitride (g-C 3 N 4 ) with photosensitive AgBr and zeolitic imidazolate framework-8 (ZIF-8), and its physicochemical parameters, crystal morphology and electrochemical properties were characterized using a series of techniques. The modified g-C 3 N 4 not only improves the ability to capture pollutants in water, but also efficiently catalyzes the degradation of bisphenol A (BPA) in water by rapidly producing superoxide radicals ( · O 2 − ), cavitation (h + ) and hydroxyl radicals ( · OH) in visible light, with the removal efficiency reaching 80.4%. The activity of catalytic degradation of BPA from strong to weak is g-C 3 N 4 /ZIF-8/AgBr, g-C 3 N 4 /AgBr, g-C 3 N 4 /ZIF-8, AgBr, g-C 3 N 4 , ZIF-8. After four cycles of experiments, it was found that g-C 3 N 4 /ZIF-8/AgBr had still considerable degradation ability (70.2%) and stability.
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