Materials Today Chemistry
·
2024
·
IF 6.7
Li Jiang,Meng Xu,Mianyu Bao,Yanmao Dong,Yan Yuan,Xing Zhou,Xiangkang Meng
The harsh acidic environment containing chloride ions has created serious corrosion hazards for ferritic stainless steels . Zeolitic imidazole frameworks (ZIFs) are a promising material for corrosion protection due to their microstructural and physicochemical properties. In this study, we proposed the electrodeposited ZIF-67 reinforced polypyrrole (PPY) coating (PPY/ZIF-67) for corrosion protection of 430 ferritic stainless steel (430SS). The morphology, microstructure, and anticorrosion behavior of the pristine PPY and hybrid PPY/ZIF-67 coating systems were characterized. The successful electrodeposition of ZIF-67 nanoparticles on the surface of the PPY layer resulted in a uniform distribution and a compact coating structure, which contributed to the overall uniformity of the coating and enhanced both the barrier and activity inhibition functions of the coating. The protective performance of PPY/ZIF-67 coatings was evaluated through electrochemical tests, the results indicated that the anticorrosion efficiency of PPY/ZIF-67 coating (with 0.4 mol/L pyrrole monomer content) reached to 99 %, and the coating demonstrated a durable corrosion protection ability (744 h) in 0.1 mol/L HCl solution. Such performance of can be attributed to the combined effect of the anodic protection provided by the inner PPY film, the active corrosion inhibiting properties of the ZIF-67 nanoparticle layer, and the hindrance of aggressive species by the compact coating structure over the prolonged service time.
研究领域:
材料科学
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电化学
·
防腐蚀工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Ziqi Deng,Jian Gao,Yue Wang,Pengyang Deng,Yifan Zhang,Lianhua Zhao,YuShu Huang
In this paper, ZIF-67/PP hybrid membrane (ZIF-67-N) is prepared by in situ synthesizing ZIF-67 on polymer membranes for rapid extraction of U (VI) from water. The effects of pH, contact time, and concentration of U (VI) on the adsorption of ZIF-67-N are investigated. The adsorption isotherm and kinetics analysis show an extremely high adsorption capacity of 1334.8 mg/g of ZIF-67-N which is 5.36 times higher than that of ZIF-67, and a rapid adsorption equlibrium of 20 min that is 12 times faster than ZIF-67. The adsorption process is consistent with the Freundlich isotherm equation and pseudo-second-order rate equation . ZIF-67-N also exhibits good selectivity for U (VI) in simulated seawater . The high adsorption performance of ZIF-67-N is attributed to the membrane structure that improves the utilization of coordination sites including Co-OH, C-N, and C N. To our knowledge, ZIF-67-N achieves the highest adsorption capacity among reported MOFs materials. This work provides a kind of efficient adsorption materials for rapid U (VI) extraction, which will be conducive to promoting the development of U (VI) extraction technology.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Chunhong Liang,Xiaodan Zhang,Ping Feng,Hongxiang Chai,Yuming Huang
The hollow nanostructures receive increasing attention in recent years. In particular, the confined cavity in the hollow nanostructures can function as a carrier for loading target molecules, whereas the porous walls are beneficial for shortening the transport distance of target molecules from solution to surface of adsorbent, making it possible to achieve high adsorption capacity with short adsorption time. Here, the hollow Co 3 S 4 was synthesized by using ZIF-67 as template and thioacetamide as sulfide reagent through a simple solvothermal method, and characterized by SEM, TEM, HRTEM, XRD, FT-IR, zeta potential measurement, TG, N 2 adsorption-desorption and XPS analysis. The adsorption performance of hollow Co 3 S 4 for ciprofloxacin (CIP) antibiotics was evaluated in neutral aqueous solution. The equilibrium adsorption data were well fitted by Langmuir model, and a high maximum CIP adsorption capacity of 471.7 mg g −1 was obtained. The relatively high correlation coefficient of Tempkin model ( r 2 = 0.960) indicated a stronger electrostatic interaction between CIP and hollow Co 3 S 4 , which was consistent with the observation from the effects of pH and ionic strength. Result of adsorption kinetic investigation indicated fast CIP adsorption by hollow Co 3 S 4 . The adsorption kinetics follows the pseudo-second-order kinetic model and liquid-film diffusion model. CIP adsorption by hollow Co 3 S 4 was hardly affected by humic acid. Further, the hollow Co 3 S 4 exhibited no obvious loss in CIP removal after recycling for five times. The result displays an important environmental significance of hollow Co 3 S 4 for CIP sequestration, in particular in wastewater, where CIP antibiotics are only slightly transformed or even unchanged.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 6
·2962-2970
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IF 3.925
Jun Wang,Yinan Li,Shujun Xu,Changmei Lin,Xiaojuan Ma,Yonghao Ni,Shilin Cao
Indoor formaldehyde (HCHO) (emitted from furniture and/or wood products) causes widespread concerns, and photocatalysis is one of the effective methods to degrade HCHO. In this work, we prepared a new MOF-based photo-catalyst by modifying ZIF-67 (modified ZIF-67, ZIF-67-F) via a low-temperature thermal treatment, which allows the conversion of –NC– groups in ZIF-67 to –NCO, effectively expending the limited light absorption of ZIF-67 from 200–310 nm and 500–620 nm to a broad absorption in the UV-visible region of 200 to 780nm. In addition, the dissociation of the functional groups (–CH3) on ZIF-67 creates more cavities and improves the porous ZIF-67-F material. Benefiting from the excellent light excitation and adsorption performance, ZIF-67-F can successfully degrade 87.8% HCHO at room temperature, where, ˙O2− is the main active species in the degradation reactions. In addition, ZIF-67-F shows great stability and reusability.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Chengjuan Wang,Haotian Jiang,Bowen Cui,Xiaodan Xu,Mengfan Li,Zhenhao Xu,Hongxue Tan,Deli Yang,Yanqiu Feng,Yanxiang Wang,Chengguo Wang
Aiming to solve the aggravating electromagnetic radiation issues, high-performance electromagnetic wave (EMW) absorbers are urgently required. Recently, integrating carbonaceous and magnetic materials to obtain dielectric-magnetic double EMW loss has been intensively explored. Here, Co 3 O 4 /Co@carbon nanofibers/carbon nanotubes anchored on carbon fiber (Co 3 O 4 /Co@CNFs/CNTs/CF) hybrids (CFFs) with distinctive heterostructure were synthesized by annealing ZIF-67@CF and catalytic chemical vapor deposition, and deliver great superiorities in microwave dissipation. Specifically, when at a low filling ratio of 25 wt% in paraffin wax, CFF650 acquires a superb minimum reflection loss up to −60.85 dB at only 1.22 mm together with a broad effective absorption bandwidth of 4.24 GHz at merely 1.38 mm. Remarkably, the specific reflection loss of CFF650 achieves an unexpected value, comparable to many distinguished carbon-based composites previously reported. Besides, the simulation of radar cross section values ascertains the fulfilling stealth ability of CFFs under radar detection. These excellent characteristics benefit from the diverse components and unique heterostructures, which form rich conductive networks, plentiful heterogeneous interfaces, appropriate defect polarization and dipole polarization, sufficient magnetic loss as well as optimal impedance matching. Combined with the feasible and efficient fabrication method, this work offers a significant promise of CF-based composites for practical applications in EMW absorption.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 26
·1-12
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IF 2.8
Zhao Zhihua,Jin Ziying,Pan Yafang,Jin Guixin,Shen Xiaoqing,Wu Lan
In this paper, the humidity sensitive material ZIF-67 with rhombic dodecahedron structure was prepared by the co-precipitation method. The crystal structure, elemental composition, and morphology were comprehensively characterized utilizing diverse analytical techniques. The humidity sensing properties were investigated at room temperature (25 °C). The ZIF-67 humidity sensor exhibited preferable humidity sensing performance with a wide linear detection range (11% − 95% relative humidity (RH)), rapid response/recovery time (34 s/211 s), high response (120.05), good stability, and high resolution with a minimum detection limit of 1% relative humidity. The sensor also exhibited good repeatability and stability, demonstrating its potential applications in environmental monitoring, medical practice, aerospace technology, and other domains that require high-precision measurement. In addition, this study proposes a promising candidate material for humidity sensing, exhibiting vital potential in a specific area or application and having the potential to develop cutting-edge humidity sensors.
研究领域:
材料科学
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传感器技术
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环境监测
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jia Xie,Yingpeng Yang,Hao Zhang,Saisai Chen,Zhengjun Lv,Yujun Zhou,Junwen Qi,Xiuyun Sun,Jiansheng Li
Advanced oxidation processes (AOPs) were appealing wastewater treatment options yet practices were hampered by reactor design and diminished performance in complex water matrices. Herein, one-step-pyrolysis strategy was proposed for large-scale synthesis of ZIF-67 derived conductive Co/N carbon hollow fiber ultrafiltration membrane to achieve exceptional availability of catalytic sites and interference prevention from macro molecular substances by size exclusion. Benefitting from the microenvironment modulation and electric field assistance (−1 V, membrane as the cathode), the bisphenol A (as a model micropollutant) can be efficiently removed with enhanced mass transfer of flow-through process (modified apparent reaction rate constant of 1260 μM g cat -1 s −1 ) and the active cobalt species were cycled via electroreduction thus showing exceptional sustainability with nearly zero Co leaching even after 24 h operation. The synergy effects between separation and catalysis alleviated the deteriorated AOPs efficiency and membrane fouling caused by macromolecular organic matter. The integrated membrane system provides new insight into rational design of catalytic membrane and system engineering for advanced water purification.
研究领域:
环境科学
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材料科学
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污水处理
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DOI
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 150
·期 10
·3017-3022
·
IF 2.482
Hou Wenxin,Huang Yu,Liu Xiang
In this study, the ZIF-67 catalyst is synthesized by reaction of cobalt nitrate hexahydrate with 2-methylimidazole at room temperature. The ZIF-67 catalyst shows excellent efficiency for the degradation of tetracycline (TC) in the presence of hydrogen peroxide. Moreover, the effects of catalyst dose, hydrogen peroxide concentration and tetracycline concentration for the degradation of tetracycline have also been studied. The free-radical quenching experiments indicate that the hydroxyl radical (⋅OH) is the predominant active species in the degradation. In addition, the catalyst has been successfully reused four times without obvious decrease in the degradation efficiency of TC, revealing the great reusability and stability of ZIF-67. Graphic Abstract 1. The ZIF-67 catalyst exhibites excellent efficiency for the degradation of tetracycline. 2. The ZIF-67 catalyst is synthesized from cobalt nitrate hexahydrate and 2-methylimidazole. 3. The free radical quenching experiments indicates that the hydroxyl radical (⋅OH) is the predominant active species in the degradation.
研究领域:
环境科学
·
催化化学
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DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2024
·
IF 2.6
Wang Jian Ming,Chu Xue Qing,Zeng Han
Hemoglobin (Hb)-based electrodes were fabricated using a Co-based complex with cobalt nitrate hexahydrate and 2-methylimidazole as fundamental elements to accommodate enzymes via the conventional solvothermal method. The binding of redox protein molecules to metal–organic framework-based complexes occurred through a synergistic effect of hydrogen bonding and competitive complexation, resulting in a partially oriented arrangement of metalloprotein molecules with enhanced hydrophilicity. The Hb–Co complex was formed via a typical electrostatic quenching mode with a moderate binding capacity. The native heme site within Hb and the cofactor of the enzyme ligated with ZIF-67 were involved in the electron shuttle process. The former electro-active site displayed favorable electrochemical activity (apparent heterogeneous electron transport rate: 0.1 s –1 ). The inherent configuration of the cofactor in the protein and abnormal electrocatalytic activity of the incorporated protein were considerably maintained. The electrocatalytic efficiency could be affected by both the protein and the Co-based complex. The key step in restraining the electrochemical sensing performance was the H 2 O 2 mass transfer procedure. Graphical abstract The schematic illumination to the preparation procedure of hemoglobin-based electrode on the basis of Co element based MOF material: ZIF-67 as protein carrier via the collaborative effect of the hydrogen bond interaction and the competitive coordination between heme protein and elements in ZIF-67 as well as hemoglobin-induced electro-catalytic H 2 O 2 reduction.
研究领域:
生物化学
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材料科学
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电化学
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DOI
高影响因子
Journal of Central South University
·
2021
·Vol. 28
·期 5
·1279-1290
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IF 1.716
Zhang Guang-ji,Tang Fei-ying,Wang Li-qiang,Yang Wen-jie,Liu You-nian
Transition metal sulfides (TMSs)-based materials have been extensively investigated as effective non-noble catalysts for various applications. However, the exploration of TMSs-based catalysts for hydrogenation of nitro compounds is limited. Herein, CoS x /NC catalysts were prepared by solvothermal sulfurization of ZIF-67, followed by high-temperature annealing (300–600 °C) under NH 3 atmosphere. It was found that the structures and compositions of the as-prepared CoS x /NC can be readily tuned by varying the annealing temperature. Particularly, CoS x /NC-500, which possesses higher degree of S defects and larger specific surface areas, can achieve high conversion, selectivity and stability for catalytic reduction of nitro compounds into amines under mild reaction conditions.
研究领域:
化学工程
·
催化材料科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Gangsheng Zhang,Jianyang Gao,Jing Wang,Haifeng Lin,Jixiang Xu,Lei Wang
A N-doped carbon-wrapped Co 9 S 8 catalyst (N-C/Co 9 S 8 ) was prepared in this work by pyrolysis sulfurized-ZIF-67 and melamine mixture. The prepared catalyst was used to degrade tetracycline (TC) with peroxymonosulfate (PMS) as oxidant. The optimized catalyst could remove 96.8 % TC in 15 min with a rate constant of 0.196 min –1 . The degradation mechanism, intermediates, and possible pathway were discussed. It was found that pyridinic N, Co-N, Co species, S 2– , C-S-C, and C-SO x were active sites to activate PMS. The N-doped carbon (N-C) could facilitate electron transfer . The surface-bound ·OH, SO 4 •− , and ⋅O 2 − radicals, especially 1 O 2 and electron transfer mechanism contributed to TC degradation . The effects of solution pH, inorganic ions and humic acid on TC degradation were discussed. This study might prompt the development of other ZIF-67-derived sulfides for environmental remediation.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Yifan Shao,Chao Hu,Ruirui Liu,Bingxin Liu,Yongquan Zhou,Jianming Pan
The design of adsorbents with high recognition activity, high site density and high mass transfer efficiency is the significant to the removal of specific non-metallic ions from Salt Lake brines. Here we report the fabrication of ZIF-67-derived hollow Co 3 S 4 nanoadsorbent for the adsorption and separation of boron (B) in complex water from concentrated salt solutions. The adsorption experiments displayed that the B adsorption capacity of the hollow Co 3 S 4 material exhibited substantial B adsorption capacity, reaching 283.3 mg·g −1 , which represents an impressive 7.3-fold improvement over ZIF-67. On these grounds, a series of kinetic and thermodynamic studies were conducted, and the results revealed that the adsorption process is more consistent with the spontaneous exothermic reaction of the Langmuir adsorption isothermal model (R 2 = 0.999). The results of the charge density and density of states depicted that Co atoms strongly interact before and after adsorption, and that Co atoms are tend to react spontaneously with H 3 BO 3 , which serves as the primary adsorption site. The interaction including electrostatic and hydrogen bonds jointly realizes in B adsorption performance with high selectivity and excellent cycle stability. This study highlighted the high adsorption performance of the hollow Co 3 S 4 for boron in real water of the Salt Lake brine and provided a new idea for the design of other ZIFs derived hollow nanoadsorbent for practical applications.
研究领域:
材料科学
·
环境科学
·
化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）