APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Peng Zhang,Ziyan Wang,Yan Zhang,Jian Wang,Wenqing Li,Lina Li,Peiping Zhang,Cundi Wei,Shiding Miao
In this work a Pd/Fe-Co-Ni layered double hydroxide (LDH) composite was prepared and investigated in the semi-hydrogenation of 2-methyl-3-butyn-2-ol (MBY). Hollow nanocages of ternary Fe-Co-Ni LDH were constructed by stacking the LDH nanosheets edge-to-face which inherited the rhombic dodecahedral structure of ZIF-67 templates. Uniform palladium (Pd) nanocrystals with cubic shapes were imbedded in the LDH nanocages via a solvothermal method. The hydroxyl groups on LDH supports were critical to inhibit the association of excess hydrogen atoms on the catalyst, so less MBY molecules were converted to 2-methyl-2-butanol (MBA) during the hydrogenation catalysis. Under optimized reaction conditions the hydrogenation activity of Pd/Fe-Co-Ni LDH was significantly improved, and the conversion of MBY was higher than 99% with selectivity of 2-methyl-3-buten-2-ol (MBE) exceeding 99%. The catalyst was easily recovered and had little reduction in catalytic performance during the cycling reactions.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jiuli Han,Lu Bai,Haiyan Jiang,Shaojuan Zeng,Bingbing Yang,Yinge Bai,Xiangping Zhang
Ionic liquids (ILs) have become attractive in membranes for CO2 separation because of the designable structure, high CO2 affinity, and good compatibility and stability. Modification of metal–organic frameworks with ILs is an effective strategy to improve the gas separation performance of mixed matrix membranes (MMMs). In this work, task-specific ionic liquids (TSILs) were incorporated to prepare TSIL@ZIF-67/PIM-1 MMMs and improve CO2 separation performance because of the high CO2 solubility and great compatibility toward ZIF-67 and PIM-1. The TSILs (TMGHIM and TMGHPhO) selectively and reversibly interact with CO2 and improve the interfacial compatibility between ZIF-67 and PIM-1, leading to higher CO2/CH4 and CO2/N2 selectivities than that of the ZIF-67/PIM-1 MMM and the directly blended membrane (TSIL/ZIF-67/PIM-1). The 10 wt % TMGHIM@ZIF-67/PIM-1 MMM shows enhanced CO2/N2 and CO2/CH4 selectivities of 13.7 and 10.5, respectively; meanwhile, the CO2 permeability reaches 12,848.5 Barrer and is 2.5 times that of the pure PIM-1 membrane. The TSIL@ZIF-67/PIM-1 MMMs also show good stability against physical aging.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Materials Today Nano
·
2025
·
IF 8.2
Haotian Jiang,Yanxiang Wang,Chengjuan Wang,Shichao Dai,Bohan Ding,Jinghe Guo,Yue Sun,Dongming Liu,Hui Li
Exploring the synergistic effects of components and structures has emerged as a pivotal strategy for advancing high-performance electromagnetic wave (EMW) absorbing materials. In this work, we present an approach that integrates magnetic-dielectric components and porous structures by incorporating unidirectionally frozen-drying aramid nanofiber aerogels with ZIF-67 and subsequently preparing Co/Co 3 O 4 @carbon nanotubes/carbon nanofibers aerogels through heat treatment and catalyst chemical vapor deposition. By combining different functional components, a multiple heterostructure with excellent absorption capacity, wide effective absorption bandwidth (EAB), and thin thickness can be achieved. The inclusion of the magnetic-dielectric component significantly enhances the impedance matching, generating multiple loss mechanisms. Additionally, the three-dimensional porous structure of the aerogel facilitates multiple reflections and scattering of the incident EMWs, thereby enhancing the microwave absorption. Specifically, the obtained samples exhibit outstanding EMW performance, with a minimum reflection loss of −73.50 dB at a thickness of merely 2.08 mm and an EAB of 5.90 GHz. Furthermore, simulations evaluating radar cross-section values, electric field strengths, and energy loss density are conducted to assess the stealth capabilities under radar detection. This study culminates in the preparation of an aerogel characterized by excellent wave-absorbing properties and effective thermal insulation, offering vast potential for practical applications.
研究领域:
材料科学
·
电磁学
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化学工程
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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.
研究领域:
环境科学
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分析化学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Juanjuan Cai,Leilei Jiang,Huaming Wei,Chongqing Wang,Liang Yu,Lixiong Zhang
In the present work, a carbon/cobalt composite was prepared and evaluated for adsorption of ecologically harmful tannic acid (TA). The composite was prepared by simply mixing phenolic resin with ZIF-67 and following by carbonization . TEM and SEM images showed that ZIF-67 was etched by phenolic resin and cobalt nanoparticles were formed and evenly distributed in carbon. Macroporous structure was generated between the carbonized phenolic resin and ZIF-67. N 2 adsorption-desorption isotherms results exhibited that the composite also had both micro- and meso-pores (average pore size of 5 nm) with a high surface area of 393 m 2 g −1 . Porous structure and evenly distributed cobalt nanoparticles facilitated the diffusion and adsorption of TA due to the formation of the complex between TA macromolecules and cobalt. The highest observed adsorption amount was as high as 2778 mg g −1 , significantly higher than that of the carbon prepared from carbonization of phenolic resin (205 mg g −1 ) and ZIF-67 (1375 mg g −1 ). The carbon composite material is easy to recover and reuse due to the magnetic property . The reuse experiment also showed high stability of the composite. All of the results indicated a great potential of the developed carbon composite material in wastewater treatment in the industry.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Hong Yao,Gang Jin,Guozhe Sui,Jinlong Li,Dongxuan Guo,Shuang Liang,Ze Luo,Rongping Xu,Chao Wang,Jing Tang
Z-scheme photocatalytic heterojunction is considered as an effective strategy to promote the photogenerated electron-hole separation for improving the efficiency of photocatalytic hydrogen precipitation from splitting water significantly. Herein, a novel Z-scheme 2D-ZnIn 2 S 4 /NiCoP heterojunction is successfully prepared by coupling NiCoP derived from ZIF-67 through phosphating treatment with 2D-ZnIn 2 S 4 lamellae via a facile hydrothermal method . The Z-scheme heterostructure of ZnIn 2 S 4 /NiCoP could suppress the recombination-rate of photogenerated electron-hole pairs and enhance the visible-light-driven photocatalytic hydrogen production . As a result, the hydrogen production rate of 2D-ZnIn 2 S 4 /NiCoP (10 wt% ZnIn 2 S 4 ) increase to 5098.12 μmol g −1 h −1 significantly with an apparent quantum yield (AQY) of 5.24% at 420 nm, which is 3.07 times than that of bare ZnIn 2 S 4 . The enhancement of photocatalytic performance is attributed to the following issues: 2D-ZnIn 2 S 4 could avoid the agglomeration of tiny ZnIn 2 S 4 , exposing more active sites and shortening the transmission distance of photogenerated carries; the formation of Z-scheme heterostructure could promote the separation of photogenerated electron-hole pairs; the unique hollow structure of NiCoP derived from ZIF-67 could inhibit the recombination of the photogenerated electron-hole. Overall, this work could provide a new idea for designing and preparing of visible-light-driven photocatalysts with high efficiency for photocatalytic hydrogen production.
研究领域:
材料科学
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能源化学
·
光催化
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Nan Jiang,Qian Wang,Huiqiong Zhang,Ziwei Liu,Hao Yang,Rong Chen,Zhong Lu
Aerosol-based transmission contributes to infection by various pathogens. Consequently, it is urgent to design antimicrobial personal protective equipment (PPE) and address the potential biological contamination of discarded PPE. We report a novel ZIF-67-modified PP fabric for photothermal disinfection; our work provides a fast, one-step, and low-cost preparation approach for incorporating zeolitic imidazolate framework (ZIF) nanoparticles (NPs) onto polypropylene (PP) fabric. First, we prepared ZIF-67-water NPs and ZIF-67-methanol NPs using relevant solvents and characterized them by X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, and field-emission scanning electron microscopy. We then used only ultrasonication to prepare ZIF-67-modified fabrics by incorporating ZIF-67 NPs onto PP fabric with a 0.5－1.5 mg/cm 2 loading rate (18.5－40.5 wt%). The ZIF-67-modified fabrics were subjected to the same characterization, and then they were evaluated for photothermal performance, hydrophobicity and antimicrobial ability. The fabric of ZIF-67-water@PP-1.5 was selected to repurpose an antimicrobial mask. We demonstrated that the ZIF-67-modified fabrics have excellent photothermal performance with near-infrared (NIR) radiation and exhibit increased hydrophobicity, which is determined by the loading rate of ZIF-67 NPs. The surface temperature reached and maintained peak levels (70 °C and 90 °C) with NIR radiation, whilst the highest contact angle was over 140°. The photothermal behaviour could kill over 99.9% of gram-negative and gram-positive drug-resistant bacteria, whilst the haemolytic behaviour was less than 5%. The repurposed mask retained controllable photothermal properties. The application of these fabrics not only addresses the demand for affordable antimicrobial PPE but also contributes to reducing potential biochemical threats in discarded PPE.
研究领域:
材料科学
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医学
·
生物工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jinyu Liu,Zikang Qin,Linlin Yang,Jing Wei,Chao Feng,Bo Tang,Wenju Jiang,Lin Yang,Lu Yao,Junfeng Zheng,Zhongde Dai
Membranes based on two-dimensional (2D) materials often show great separation efficiency and therefore have great potential in the treatment of dye wastewater. However, improving the water flux of 2D material-based membranes remains a challenge. In this work, 2D ZIF-67/CNF membranes were prepared on a polyether sulfone (PES) support layer via a simple extraction filtration method. The added CNF intertwined with 2D ZIF-67 nanosheets and formed an interlocked stacked laminar flow structure, which improved both the water flux and stability of the thin-film nanocomposite (TFN) membranes. The optimized membrane showed a water flux of 357.8 L m − 2 h − 1 bar − 1 , and its rejections of four dyes (Direct Red 80, Methyl Blue, Alkali Blue 6B and Congo Red) were all above 99.8 %. Furthermore, the optimized membrane maintained a rejection of 97 % after 8 h of continuous operation, indicating that the facile mixing of nanofibers into nanosheets can be considered a promising strategy for preparing TFN membranes for dye wastewater treatment.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2024
·Vol. 14
·期 6
·508
·
IF 2.4
Sumei Li,Jian Ji,Saisai Shan,Sha Chen,Hanbing Li,Qian Xu,Yixuan Liang
Tetrabromobisphenol A (TBBPA) is a kind of widely used brominated flame retardant (BFR), which is proven to be harmful to ecological systems and public health. It is very important to remove TBBPA from the environment. In our study, a magnetic composite named Fe3O4/GO/ZIF-67 was synthesized by a coprecipitation method and applied in the highly efficient adsorption of TBBPA from water. Static adsorption experiments demonstrated that the adsorption capacity could reach 232 mg·g−1within 120 min, which is much higher than those reported in the other literature. The experimental results show that the adsorption of TBBPA on Fe3O4/GO/ZIF-67 followed Langmuir and pseudo-second-order kinetic adsorption models. The main mechanisms for these adsorptions were identified as hydrogen bonds between OH groups in TBBPA and COOHs of Fe3O4/GO/ZIF-67, and π-π stacking between Fe3O4/GO/ZIF-67 and TBBPA. This study provides a method with great promise for the design and synthesis of better adsorbents for the removal of TBBPA from the water environment.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Enhao Zhang,Sisi Yao,Xiaoxuan Guo,Xinyi Zhou,Yutai Li,Feifan Xie,Yonghang Wei,Dongjiang Yang,Jin Sun,Yun Lu
The advancement of highly efficient bifunctional electrodes tailored for water electrolysis, specifically targeting the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), is pivotal for sustainable hydrogen production. However, sluggish reaction kinetics and elevated overpotentials pose formidable hurdles. In this study, an innovative strategy is introduced by integrating Fe@ZIF-67 onto self-supporting carbonized rattan stem (CR), leveraging its distinctive through-channel macroporous architecture to bolster catalytic efficacy. The self-supporting CR substrate not only enhances mass transport but also facilitates uniform deposition of ZIF-67, ensuring optimal exposure of active sites. A comparative analysis with carbonized basswood (CW) underscores the superior performance of the macroporous CR substrate in augmenting both OER and HER activities. Notably, the Fe@ZIF-CR self-supported electrode achieves an overpotential of 208 mV at 10 mA cm⁻² for oxygen evolution and 317 mV at 100 mA cm⁻² for hydrogen evolution. Additionally, the self-supporting nature of the CR substrate guarantees long-term stability and mitigates catalyst loss during operation. These findings underscore the synergistic advantages of the macroporous structure and ZIF-67 active sites, offering fresh perspectives on the utilization of biomass-derived carbon materials in sustainable energy technologies.
研究领域:
材料科学
·
可再生能源
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Functional Materials Letters
·
2019
·
IF 1.388
Lei Wei,Hongyan Liu,Qian Wang,Wenjuan Li,Lufeng Peng
Cobalt-based catalysts are highly efficient and low-cost for sodium borohydride (NaBH 4 ) hydrolysis to generate hydrogen. Co 3 O 4 and carbon-supported metal Co (i.e., Co/C) catalysts were prepared by means of ZIF-67 pyrolysis. Effects of pyrolysis temperature and atmosphere on catalyst composition and performance were mainly investigated. For material analyses, a series of characterizations were carried out including FE-SEM, TEM, XRD, BET, TGA and ICP-AES. Conventional water-displacement method was employed to evaluate the catalyst performance toward NaBH 4 hydrolysis. Experimental results indicated that catalytic activity of the Co 3 O 4 was much higher than that of Co/C, and the reasons were discussed in detail.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 41
·94112-94125
·
IF 5.8
Zhang Mingyuan,Li Yueyao,Zhou Xiaoying,Wang Liping,Xie Yuke,Hou Chentao
In recent years, wastewater treatment to remove tetracycline hydrochloride (TCH) has received much attention in water treatment problems. ZIF-67/C 3 N 4 composite adsorbent, a nanosheet structured material stacked with MOFs, was prepared by in situ growth method, which has high adsorption activity for tetracycline hydrochloride in wastewater. Comparing the effect of monomeric and composite adsorbents, Z 6 C 2 had the best adsorption effect (206 mg·g −1 ), which was 77.6% higher than that of ZIF-67 (116 mg·g −1 ) and 10.8 times higher than that of C 3 N 4 (19 mg·g −1 ). The structure of ZIF-67 stacked on C 3 N 4 nanosheets has an excellent specific surface area and number of active sites, as well as π-π interactions, electrostatic interactions, and hydrogen bonding interactions between the adsorbent and TCH, which combine to enhance the adsorption performance. The adsorption process is accompanied by a combination of chemisorption, mass transport, and internal diffusion rate-limiting. It was shown that the adsorption process is favorable for monolayer adsorption as well as a heat absorption reaction that proceeds spontaneously. The adsorbent exhibits good stability and adsorption capacity, which may be suitable for efficient and low-cost water purification.
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
危险品化学品经营许可证（带存储）