RARE METALS
·
2021
·Vol. 41
·期 1
·189-198
·
IF 4.003
Tang Jing,Hui Zhen-Zhen,Hu Tao,Cheng Xin,Guo Jia-Hao,Li Zi-Rong,Yu Hao
The composite of zeolitic imidazolate frameworks (ZIF-67) and ordered macroporous carbon (OMC) was successfully synthesized via in situ growth from the OMC matrix. The ZIF67–OMC composite was verified by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), powder X-ray diffraction (XRD) and electrochemical impedance spectroscopy (EIS) and then evaluated as a modified material for electrochemical sensor. Benefitting from the large surface area and enhanced conductivity of the ZIF67–OMC composite, ZIF67–OMC nanocomposite showed superior electrocatalytic performance toward acetaminophen (AP) oxidation. The redox reaction of AP underwent a quasi-reversible redox reaction with higher anodic current at ZIF67–OMC modified electrode compared with the bare glassy carbon electrode (GCE). In optimal condition, the ZIF67–OMC/GCE was stable, reproducible and had a linear range of 0.05–100 μmol·L −1 AP concentration, with the detection limit of 20 nmol·L −1 (signal-to-noise of S / N = 3). In addition, the prepared sensing platform for the detection of AP was evaluated for the compound paracetamol tablets and urine samples. Graphic abstract
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2021
·
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.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
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.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
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.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
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.
✓ 已验证
产品关联
DOI
高影响因子
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 ).
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
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.
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2020
·Vol. 2020
·期 36
·3466-3473
·
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.
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2020
·
IF 4.142
Summaira Saghir,Zhenggang Xiao
Metal-organic frameworks (MOFs) are traditional porous materials considered as efficient and low-cost for the removal of organic dyes from polluted water. In this study, we report a new type of hierarchical porous zeolitic imidazole frameworks −67@ layered double hydroxide (ZIF-67@LDH) consisting of nanocubes decorated with nanosheets . The prepared ZIF-67@LDH contains versatile functionalities which exhibit superior adsorption efficiency and adsorption rate for Methyl Orange (MO) and Alizarine Red S (ARS). The influence of pH, temperature, and contact time were analyzed in detail. The kinetics study revealed that the adsorption of MO and ARS over ZIF-67@LDH followed pseudo-second order (PSO) kinetic model , and adsorption isotherms were best described by the Langmuir isotherm model. Adsorption isotherms confirm the monolayer adsorption of MO and ARS over ZIF-67@LDH. The prepared material also shows outstanding recyclability with negligible loss. Thus ZIF-67@LDH presented a promising candidate for treating MO and ARS containing wastewater.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Peihong Tong,Yongjuan Meng,Junyu Liang,Jianping Li
A molecularly imprinted electrochemiluminescence (MIP-ECL) sensor with high sensitivity and good structural stability was constructed using the new composite material ZIF-8-NH 2 as an imprinted membrane. The ZIF-8-NH 2 imprinted composite material was prepared through layer-by-layer self-assembly with carboxyl functionalized magnetic CoFe 2 O 4 nanoparticles as the carrier, ZIF-8-NH 2 precursor as the functional monomer, and cinchonine (CCN) as the template molecule. The ZIF-8 MIP@Au@CoFe 2 O 4 core–shell imprinted material was characterized using infrared spectrometry, scanning electron microscopy and X-ray diffraction, and the recognition performance of molecularly imprinted sensor was characterized through electrochemical impedance spectroscopy and electrochemiluminescence (ECL) method. When CCN was re-adsorbed by the imprinted membrane, the ECL intensities of the MIP sensor increased because CCN molecules can promote the ECL intensity of Ru(bpy) 3 2+ . As a result, the MIP sensor showed preeminent linear response to CCN in the range of 1.0 × 10 −12 – 3.1 × 10 −8 mol/L, with a detection limit of 7.0 × 10 −13 mol/L, which is much lower than that reported for other detection methods. The sensor shows good practicality and can be used to detect CCN in human serum with recoveries ranging from 96.0%–103.0%.
✓ 已验证
产品关联
DOI
高影响因子
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.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2020
·
IF 3.204
Feihong Wang,Tong Zheng,Panpan Wang,Jun Ma
In this study, we investigated the influences of zeolitic imidazolate framework-8 derived porous carbon (CZIF-8) on the permeation and antifouling property of thin-film nanocomposite membranes (TFN). The incorporation of CZIF-8 into polyamide layer enhanced the water flux from 11.64 to 18.23 L/m 2 ∙h without decreasing NaCl rejection. Dynamic fouling tests with bovine serum albumin illustrated that the TFN membrane possessed an enhanced antifouling property after three cycles. The higher water flux recovery ratio and the lower fouling ratio of TFN membranes are attributed to the changes in physiochemical property of membrane.
✓ 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）