COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Xin Hong,Ruojun Mu,Ting Lin,Liping Dao,Shuyi Wu,Zhiming Yan,Jie Pang
Konjac glucomannan/zeolitic imidazole framework-67 (KGM/ZIF-67) hybrid aerogels were prepared as novel adsorbents to remove malachite green (MG) from aqueous solutions. The impacts of adsorption temperature, solution pH, and ionic strength on adsorption capacity were investigated. The results show that ZIF-67 coordinates with the molecular chain of KGM and modifies the KGM aerogel. The adsorption equilibrium time of KZ2 for MG is 150 min. The adsorption process follows the pseudo-second-order and Langmuir models, with a maximum adsorption capacity of 2891.30 mg·g −1 at 30 ℃. MG adsorption using the hybrid aerogels is a spontaneous and endothermic process. This research shows that hybrid aerogels prepared using KGM and ZIF-67 are promising for use in new water purification applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Carbon Letters
·
2023
·
IF 4.5
Gao Qiuyue,Li Guoru,Kofie Gideon,Chen Biaohua,Yin Fengxiang
A series of ZIF-67-C-IL catalysts were prepared using ZIF-67 and 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([BMIM]NTf 2 ) ionic liquid as precursors. The structure of the catalysts was characterized by XRD, TEM, SEM and XPS. The catalytic performance of the catalysts for the oxygen reduction reaction (ORR) was evaluated in a three-electrode system. The results confirmed that the high-temperature treatment of the precursors resulted in the formation of N, S co-doped carbon-encapsulated Co 9 S 8 nanoparticles. To create N, S co-doped carbon coated Co 9 S 8 nanoparticle catalysts, ionic liquids are used as sulfur and nitrogen sources. The catalytic activity of ORR can be improved using N, S co-doped carbon to prevent the aggregation of Co 9 S 8 nanoparticles. Graphitized and N, S co-doped carbon shells are optimal for achieving high activity stability. Optimal 600-ZIF-67-C(1:1.5)-30IL catalytic activity was observed for ORR. The half-wave potential of ORR was 0.88 V vs. RHE in 0.1 mol L −1 KOH, with a limit current density of 4.70 mA cm −2 . Similar ORR electrocatalytic activity was observed between this catalyst and commercial Pt/C (20 wt%).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hang Xu,Lili Jiang,Yan Hu,Jitao Lin,Chao Zhou,Zhijun Zhong,Xiaomin Li,Chuanqiang Yin,Changxin Tang,Lang Zhou
Polyimide (PI) has emerged as a promising material for constructing efficient gas separation membranes due to its excellent stability and gas separation properties. Herein, we report a novel composite membrane structure that utilizes the synergistic effect to achieve efficient H 2 /CO 2 separation by skillfully integrating the advantages of three different functional layers. The support layer consists of a PI fiber membrane loaded with zeolitic imidazolate framework-67 (ZIF-67) using an in-situ growth method, which not only enhances the overall mechanical strength of the membrane, but also provides complex gas transport pathways to improve selectivity. The intermediate layer is made of polydimethylsiloxane (PDMS), which prevents excessive penetration of the selective layer solution into the support layer. The selective layer is a mixed matrix membrane composed of polyetherimide (PEI) as the polymer matrix and zeolitic imidazolate framework-67 (ZIF-67) as the porous filler, which provides critical molecular sieving functionality. Compared to pure polyetherimide (PEI) film, the composite membranes have significantly improved mechanical and gas transport properties, with H 2 permeability of 83.4 Barrer and H 2 /CO 2 selectivity of 5.4. Additionally, the composite membranes exhibit excellent hydrophobicity and thermal stability. Given their outstanding overall performance, the composite membranes developed in this study demonstrate significant potential for CO 2 capture and H 2 recovery applications.
研究领域:
材料科学
·
化学工程
·
膜技术
·
气体分离
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xuan Yang,Xueqin Wang,Shenghao Xu,Beili Lu,Biao Huang,Xinyu Zheng,Guanfeng Lin
Hydroquinone (HQ) in wastewater is of great concern, as it is harmful to human health and threatens the ecological environment. However, the existing adsorbents have low adsorption capacity for HQ. To improve the removal of HQ, N,S-codoped activated carbon-ZIF-67 (NSAC-ZIF-67@C) was synthesized in this study by in situ growth of ZIF-67 on N,S-codoped activated carbon (NSAC) and carbonization. The influence of pH, contact time, and initial concentration on the adsorption behaviors of NSAC-ZIF-67@C on HQ were investigated. Owing to the synergistic effect of abundant active sites and well-developed pore structure, the NSAC-ZIF-67@C achieved a prominent adsorption capacity of 962 mg·g–1 and can still retain high adsorption performance after 5 cycles for HQ, which is superior to that of reported other adsorbents. HQ adsorption follows the pseudo-second-order kinetics model (R2 = 0.99999) and the Freundlich isotherm model. X-ray photoelectron spectroscopy (XPS) analysis before and after adsorption as well as density functional theory (DFT) calculation results showed that pyridinic-N-termini were conducive to the π–π interactions and hydrogen-bonding interactions. Therefore, the adsorption mechanisms of NSAC-ZIF-67@C on HQ involve pore filling, electrostatic attraction, π–π interaction, and hydrogen bonding. This study is expected to provide a reference for designing highly effective adsorbents for wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Yifei Li,Zhongzhu Qiu,Meng Qu,Yuedi Wang,Haodong Wang,Junjie Jiang
Supercapacitors have the advantages of high power density, rapid charge and discharge rates, and extended cycling stability. However, their energy density and specific capacity are still inadequate to satisfy the current requirements for energy storage in the industry. The current work demonstrates the synthesis of Mo-ZIF-67/CNT composites through mechanical stirring and co-precipitation. After that, Ni, Co and Mo trimetallic sulfide/CNT composites (Ni-Co-Mo-S/CNT) are produced through further ion exchange/etching and vulcanization processes . The material has multiple valence states of three different metal ions, providing a large number of oxidation-reduction sites. The doping of CNT endows it with a unique coral-like structure, which helps to form its huge specific surface area and larger mesopores. Furthermore, the effect of vulcanization temperature on the electrochemical performance of the material is also studied. According to the results, the Ni-Co-Mo-S/CNT-180, which is vulcanized at 180 °C, exhibits the most outstanding electrochemical performance. The electrode exhibits impressive performance with a specific capacitance of 1728.6 F/g at a current density of 1 A/g. It also has good rate capability, maintaining 55.8 % of the specific capacitance when the current density increases tenfold. Finally, the prepared Ni-Co-Mo-S/CNT-180//AC asymmetric supercapacitor generated a high energy density of 43 Wh/kg at a power density of 735 W/kg. After 2000 charge-discharge cycles at a current density of 1 A/g, it maintains a capacity of 76.42 %. This study serves as a reference for researching multi-metal sulfides as electrode materials for high-performance supercapacitors.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Haoliang Wen,Bo Lei,Weidong Zhang
The rational design of hollow-structured composite absorbing materials is emerging as a promising approach for enhancing microwave performance. The present study successfully synthesized a series of ZIF-67/MoS 2 composites with adjustable size range using a two-step method and achieved the formation of magnetically responsive Co/C/MoS 2 hybrids through high temperature pyrolysis. The findings demonstrated that ZIF-67/MoS 2 (1:12) exhibited a wide effective attenuation bandwidth (EAB) (5.60 GHz from 12.40 GHz to 18.0 GHz) with a thickness of 2.4 mm, and minimum reflection loss (−43.46 dB) at 2.1 mm. However, Co/C/MoS 2 hybrid possessed the better EAB (5.95 GHz from 11.61 GHz to 17.56 GHz) at 1.2 mm and minimum reflection loss (−51.83 dB) at a thickness of 1.0 mm. The ingeniously synthesized ZIF-67/MoS 2 and Co/C/MoS 2 composites, hence, unravel themselves as a promising and exceedingly efficient contender for lightweight microwave absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·
IF 1.5
Dai Wei,Dai Ying,Fang Chenglei,Xu Lin,Wang Yusheng,Zhou Haiyan,Zhong Xing,Li Zhuyao,Tao Qinqin
The development of environmentally friendly, operationally simple, and easily separable adsorbents for uranium removal from wastewater holds significant importance. The biopolymer gelatin (Gel) derived from animal collagen has poor water stability, limiting its application in wastewater treatment. By in-situ compositing with ZIF-67, a nitrogen-rich and stable metal–organic framework structure introduced onto the surface of gelatin fibers enhanced the uranium adsorption capacity of gelatin nanofibers and improved the water stability of these fibers. Furthermore, through the natural polyphenolic tannic acid tanning process, it is possible to further increase selectivity of gelatin composite fibers. The gelatin composite nanofibers Gel/ZIF-67 and T-Gel/ZIF-67 were characterized using SEM, FT-IR, XRD, XPS, and contact angle. Adsorption of uranium on both nanofibers were significantly influenced by pH but minimally affected by ionic strength, indicating the inner-sphere surface complexation. The adsorption of uranium onto Gel/ZIF-67 and T-Gel/ZIF-67 followed the Langmuir isotherm model, with theoretical adsorption capacities reaching up to 608.21 mg g −1 and 612.24 mg g −1 , respectively. Kinetic modeling analysis revealed that chemical adsorption played a dominant role during the adsorption processes.
研究领域:
环境科学
·
材料科学
·
生物化学
✓ 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.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Xiaoyu Yang,Yanxia Liu,Dezhao Li,Jiayu Dong,Fengtao Chai,Baoyu Yang,Muhao Liu,Shuang Wang
PEO based solid electrolyte has high crystallinity, which seriously hinder the transport of lithium ions at room temperature, resulting in low ionic conductivity. In this paper, a high performance composite solid electrolyte membrane with LLZO@ZiF-67 as an inorganic filler and PEO as matrix was synthesized. The LLZO@ZiF-67 inorganic filler, which covered by in-situ synthesis of ZiF-67 layer on surface of LLZO, show a large specific surface area and a polyhedral structure. The introduction of LLZO@ZiF-67 effectively reduce the crystallinity of PEO, providing a continuous channel for the transport of lithium ions, which result in a ionic conductivity as high as 1 . 09 × 1 0 − 4 S cm −1 at room temperature of the composite electrolyte PLZ-20. Furthermore, the electrochemical stability and interface compatibility to lithium metal are improved. The lithium stripping/plating process at 0.1 mA cm −2 can maintain stable for more than 600 h without short circuit. In addition, the initial discharge capacity of the full battery (Li / PLZ-20 / LFP) can reach up to 141.1 mA h g −1 with retention of 91.45% after 100 cycles, which provide possibility for the application of high performance solid state battery.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Shibo Sun,Wenzi Huang,Huajuan Yu,Zhihao Sun,Wei Shang,Yuqing Wen
The magnesium (Mg) metal anodes of magnesium batteries have attracted significant attention because of their high theoretical capacity, high safety, and low cost. Their development is hindered by the passivation characteristics of magnesium, especially the serious voltage lag and corrosion polarization in aqueous solutions. This study demonstrates a novel approach involving the electrophoresis deposition on the surface of a magnesium electrode with MXene@ZIF-67. MXene@ZIF-67 is a heterojunction material with a core-shell structure obtained from MXene and ZIF-67 by the in-situ growth method. The addition of ZIF-67 not only solves the problem of MXene layer-to-layer instability, but also improves the corrosion resistance of magnesium metal by utilizing the properties of ZIF-67 material topology. The core-shell structure design of the modified film layer enables MXene and ZIF-67 to achieve efficient synergy. On the one hand, the unique lamellar structure of MXene is utilized to achieve uniform Mg 2 + flux and reduce the interfacial resistance of the magnesium anode, and on the other hand, the unique ionic conductor performance of ZIF-67 enables precise separation of solvent molecules and simultaneous selective Mg 2+ transport. So, the film is beneficial for interfacial stability and reaction kinetics. The modified Mg battery exhibits a reduction in voltage lag time from 7.2 seconds to 1.3 seconds. A notable reduction in polarity and enhanced stability in plating and stripping was observed in magnesium metal battery for 300 cycles. The DFT calculations show that there is a high adsorption energy between the MXene@ZIF-67 film and the magnesium alloy.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 11
·2426
·
IF 4.2
Liming He,Hongda Xu,Yang Cui,Jian Qi,Xiaolong Wang,Quan Jin
Carbon-based magnetic metal composites derived from metal–organic frameworks (MOFs) are promising materials for the preparation of broadband microwave absorbers. In this work, the leaf-like co-doped porous carbon/carbon nanotube heterostructure was obtained using ZIF-L@ZIF-67 as precursor. The number of carbon nanotubes can be controlled by varying the amount of ZIF-67, thus regulating the dielectric constant of the sample. An optimum reflection loss of −42.2 dB is attained when ZIF-67 is added at 2 mmol. An effective absorption bandwidth (EAB) of 4.8 GHz is achieved with a thickness of 2.2 mm and a filler weight of 12%. The excellent microwave absorption (MA) ability is generated from the mesopore structure, uniform heterogeneous interfaces, and high conduction loss. The work offers useful guidelines to devise and prepare such nanostructured materials for MA materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 18
·9547-9560
·
IF 4.4
Yang Xuhui,Jiang Siyu,Zhang Zhiyong,Li Bin,Xu Miaojun
Herein, zeolite imidazolate frameworks-67 defined as ZIF-67 was prepared and confirmed. The obtained ZIF-67 was served as a synergist in intumescent flame-retarded polypropylene (PP) composites to improve the flame retardant efficiency and smoke suppression performance. The results of thermogravimetric analysis indicated that the residual char of IFR/ZIF-67 with the mass ratio of 95:5 greatly enhanced from 24.9 mass% for IFR to 63.5 mass%, and increased by 155.0%. It was ascribed the complexation effect of cobalt ion in ZIF-67 for IFR system. With the incorporation of 18 mass% IFR/ZIF-67, the PP/IFR/ZIF-67 samples (PP-4) achieved UL-94V-0 rating during vertical burning tests and the limiting oxygen index (LOI) value was as high as 31.1%. Compared with PP/IFR (PP-1) containing 18 mass% IFR, the peak heat release rate (peak-HRR), total heat release (THR), peak smoke production rate (peak-SPR) and total smoke production (TSP) of PP-4 were decreased by 33.1%, 33.8%, 31.0% and 21.1%, respectively. The char residue of PP-4 was as high as 27.4 mass% at the end of cone calorimeter test (CCT). The more expanded, sufficient and dense char layer were generated during combustion, and the flame retardancy and smoke suppression of PP-4 were significantly improved. Meanwhile, the pyrolysis gaseous products were inhibited to enter into combustion zone due to the isolation effect of the generated intumescent char layer. Consequently, the PP/IFR/ZIF-67 composites with excellent flame retardant performance and smoke suppression were obtained.
研究领域:
材料科学
·
燃烧学
✓ 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）