Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 10
·3822-3827
·
IF 8.262
Fang He,Gang Chen,Yansong Zhou,Yaoguang Yu,Laiquan Li,Sue Hao,Bin Liu
A ZIF-8 derived carbon (C-ZIF)/g-C3N4 composite was constructed for the first time through facile thermal condensation of a zeolitic imidazolate framework (ZIF-8) and melamine. The obtained C-ZIF/g-C3N4 composite exhibited an obviously enhanced photocatalytic H2 production rate compared to pure g-C3N4 under visible light irradiation. The 1 wt% C-ZIF/g-C3N4 composite without loading the Pt co-catalyst showed 36.2 times higher H2 evolution rate than that of pure g-C3N4, which is even 2.8 times higher than that of Pt/g-C3N4 (the state-of-the-art g-C3N4-based photocatalyst). It was revealed by photoluminescence spectroscopy, time-resolved fluorescence spectroscopy and electrochemical impedance spectroscopy that the formed C-ZIF and g-C3N4 junction could promote quick charge carrier separation and transfer. The C-ZIF not only acted as an effective electron acceptor, but also functioned as an efficient hydrogen evolution reaction (HER) cocatalyst to promote photocatalytic hydrogen evolution. Our work provides an effective way for the development of metal-free, all carbon-based photocatalysts for H2 evolution.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
He Limin,Wang Yangdong,Wang Can,Liu Zhicheng,Xie Zaiku
The hydrogenation of 4-carboxylbenzaldehyde over Pd catalysts is a crucial process during the production of pure terephthalic acid. Herein, ZIF-8 derived carbon materials (NC) with adjustable N types were synthesized and used as the supports of Pd catalysts. Pd supported on NC with 50.5% of pyridinic N exhibited best hydrogenation activity with a TOF value of 4.1 min−1. The microstructures of NC support and electronic structures of Pd in Pd/NC were investigated by techniques such as XRD, N2 physisorption, XPS, H2-O2 titration and TEM. The nitrogen species in CN surface not only can adjust chemical state and dispersion of Pd nanoparticles (NPs), but also promote the adsorption and activation capability of H2 molecular. Besides, the ratio of Pd0/Pd2+ and Pd dispersion were closely correlated with pyridinic nitrogen content. The improvement in hydrogenation activity and stability of Pd/CN catalyst in relative to Pd/C were ascribed to the synergistic effect of pyridinic nitrogen and active site Pd0.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Yun-Fei Xia,Bo Liu,Pan Guo,Feng-Di Tu,Li-Xiao Shen,Miao Ma,Yun-Kun Dai,Jing Liu,Bin Xu,Yun-Long Zhang,Lei Zhao,Yan Wang,Zhen-Bo Wang
ZIF-8 derived carbons demonstrate admirable application prospects in electrocatalytic fields, while ZnN x remaining in those materials are overlooked, crippling the validity of theoretic studies in researches. Herein, the residual Zn in ZIF-8 derived carbons are found could exceed 10 wt% even at carbonization temperatures over 900℃, and Zn-NCs with various Zn contents are adopted as supports to synthesize low-platinum ORR catalysts. Substantial characterizations manifest that ZnN x in Zn-NC can not only provide Zn source for L1 0 -PtZn intermetallic, but act as ‘spatial barriers’ to prevent the formation of inactive PtN x , elevating the active Pt proportion in catalyst by ∼104%. The resultant Zn-NC-Ar-PtZn exhibits a mass activity of 0.557 mA/g Pt and a peak density of 1.485 W/cm 2 . DFT calculations show the strong thermodynamic tendency of forming PtN 4 without the protection of ZnN 4 , and the superior durability and activity of Zn-NC-Ar-PtZn should be attributed to its Zn-derived ligand effects and the SMSI.
研究领域:
材料科学
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电化学
·
理论计算
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jie Qiao,Wenbiao Ma,Xiao Du,Xuli Ma,Zhong Liu,Jun Li,Guoqing Guan,Abuliti Abudula,Xiaogang Hao
Selective ion separation from aqueous solution is challenging and crucial for water purification. In this work, zeolitic imidazolate framework (ZIF-8) derived nano-porous carbon (NC-X-A) with confined sub-nanometer pores was synthesized by acid leaching and alkali activation after the carbonization of ZIF-8 precursor for the selective electrochemical separation of chloride ions (Cl − ). Here, the uptake capacity and selectivity of Cl − were improved by changing the carbonization temperature to tune the specific surface area and pore size. Based on the size confinement effect and the difference in free energies of dehydration, the obtained optimum carbon film, i.e., NC-1000-A coated electrode, exhibited separation factors of 1.384, 1.952 and 2.970 for Cl − /Br − , Cl − /F − and Cl − /SO 4 2− , respectively. It also showed fast uptake/release ability with an uptake equilibrium time less than 90 min. The Cl − uptake capacity reached to 64.06 mg g −1 and retained 99.7% of its initial value even after 1000 uptake/release cycles due to its porous structure with high specific surface area, good electrical conductivity and extra electric driving force during the ESIX process. Thus, it is expected that this kind of carbon film would be applied as a promising electroactive material for the selective separation of Cl − from wastewater.
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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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Liangliang Zhao,Mingyang Lin,Hongyan Pan,Zheng Chen,Mingrui Liao,Qian Lin,Song Li
Membrane separation technology encounters significant challenges in achieving simultaneous separation and purification of oily wastewater contaminated with heavy metal ions. Herein, ZIF-8 derived mesoporous carbon etched by oxygen plasma (DMC-OP X ) was used as a functional component for adsorbing heavy metal ions and blended with hydrophilic copolymers PVDF- g -PHEMA into the PVDF casting solution, enabled the fabrication of an advanced nanocomposite membrane (M-H-DMC-OP X ) with separation-adsorption functionality through NIPS method. The characterization results indicate that oxygen plasma etching significantly increases the oxygen-containing groups on DMC-OP X surfaces enhancing hydrophilicity, heavy metal adsorption capacity, and mitigating flux reduction caused by unmodified DMC incorporation. Calculation analyses demonstrate that the oxygen-containing groups on DMC-OP X surface can form hydrogen bonding networks with PVDF- g -PHEMA chains, thereby improving the tensile strength of M-H-DMC-OP X membrane. The one-step separation experiments on oil-water emulsions containing Cu 2 + , Pb 2+ , Cr 3+ , Fe 3+ , and Co 2+ demonstrate that the M-H-DMC-OP 6 membrane exhibits outstanding oil-water separation efficiency and heavy metal removal efficiency, reaching over 99.2 % and 82.4 %, respectively. This work developed a multifunctional separation membrane for complex oily wastewater and established a feasible strategy for improving the water flux of nanocomposite membranes.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Yuchen Xiao,Huajun Yang,Xianhui Bu,Pingyun Feng
We report a family of carbon materials (denoted SFZ8C) prepared from templated carbonization of zeolitic imidazolate framework-8 (ZIF-8) in NaCl–ZnCl 2 eutectic salt. The hard-templating effect of the salt is utilized to sustain the framework and maximize the porosity during carbonization. In addition to rich surface nitrogen and oxygen species, SFZ8Cs have large specific surface area. These combined features give rise to excellent adsorption properties for light hydrocarbon gases. SFZ8Cs have both C 2 H 2 /CO 2 selective and C 3 /C 2 selective adsorption, as well as the ability to selectively remove impurities from methane. Particularly noteworthy is the excellent C 3 /C 2 selective adsorption performance by SFZ8C-900. Its propane/ethane selectivity (7.68) is on par with the best value (7.72) reported so far, yet SFZ8C-900 excels in propane uptake capacity. The multifunctional properties together with the ease for the mass production make SFZ8Cs promising for a number of important applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Zhihao Si,Di Cai,Shufeng Li,Guozhen Li,Ze Wang,Peiyong Qin
The diffusion process is the rate-limiting step for n -butanol recovery from diluted aqueous solution, which can be improved by incorporating hydrophobic nanoparticle into the polymer matrix. However, the micropore structure of zeolitic imidazolate framework-8 (ZIF-8) in the commonly applied ZIF-8-based mixed matrix membrane (MMM) could hardly meet the diffusion demand of the penetrant molecules. Herein, ZIF-8-derived nanoporous carbon (ZNC) with larger pore diameter and pore volume was prepared to replace ZIF-8 in conventional MMM in order to improve the diffusion process. An increase of 68.7% in n -butanol permeability of ZNC/PDMS MMM with 3 wt% of particle loading was obtained compared with ZIF-8/PDMS MMM. Coupled with the good compatibility between ZNC and PDMS , ZNC was homogeneously dispersed in PDMS matrix. As a result, a n -butanol permeability of 109,583 Barrer and a n -butanol/water selectivity of 4.47 were obtained for n -butanol recovery from 1.5 wt% n -butanol/water solution at 55 °C, which were increased by 145.4% and 17.6%, respectively, compared with the pure PDMS membrane. Overall, the ZNC-filled PDMS membrane shows promising in effective separation of n -butanol in realistic applications.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 34
·8216-8227
·
IF 7
Zhipeng Yuan,Jing Zhang,Xinfu Zhao,Sijia Liu,Shimo Yu,Xiaochan Liu,Xinen Zhang,Xibin Yi
Rapid and safe disinfection and exudate management are two major challenges in infected wound care. Therefore, in this work, we developed a novel wound dressing via encapsulating ZIF-8-derived carbon nanoparticles in a hydrophilic nanofiber sponge to address severe wound infection and heavy exudate problems. The dressing can effectively kill bacteria through chemo-photothermal synergistic therapy. Meanwhile, the hydrophilic nanofiber sponge can quickly absorb wound exudate around the wound and accelerate the evaporation rate of liquid through the photothermal effect and its own structure; therefore, it is possible to remove excess liquid and regulate its wetness. In this way, it prevents the problem of wound overhydration often caused by hydrophilic dressings. In our experiment, the dressing showed good antibacterial performance and biocompatibility in vitro and could effectively control wound infection, absorb wound exudate and promote skin wound healing in vivo. Its good therapeutic effect is not only due to effective infection control and wound exudate management, but also because the structure of nanofibers similar to an extracellular matrix provides basic physical support and structural signals conducive to skin tissue regeneration.
研究领域:
材料科学
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纳米技术
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生物医学工程
·
伤口愈合
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Parviz Sukhrobov,Sodik Numonov,Xamxikamar Mamat,Yongtao Li,Thomas Wågberg,Guangzhi Hu
The present study demonstrated a highly sensitive non-enzymatic glucose biosensor in real blood samples based on simple evaluated nickel deposited on N-doped porous carbon modified glassy carbon electrode (Ni/NPC/GCE) by applying electrochemical deposition method. The prepared material initially were characterized by cyclic voltammetry, the morphology structure of the as-prepared samples was observed by SEM, and composition, crystals structure of Ni/NPC were identified by SEM mapping and EDS tests. The Ni/NPC/GCE compared with NPC/GCE and NiNPs/GCE performed the best electrocatalytic behavior towards oxidation of glucose in 0.1 M KOH medium. By applied potential of +0.6 V Ni/NPC/GCE showed very high sensitivity of 3753.78 μAmM -1 cm -2 in linear range of 1-7940 μM with the correlation coefficient of R 2 =0.995. The linear ranges get views above the concentration up to 7940 μM with the detection limit of 0.3 μM (S/N=3). Amperometric time responses of prepared electrode towards different glucose concentrations are 0.8-1.3s. Finally, several positive characteristics such as very high sensitivity, weak working potential, nice anti-interference properties, long stability, good selectivity, and comparison with some other non-enzymatic sensors Ni/NPC/GCE executed high sensitivity, low detection limit and wide linear range to glucose sensing, thus the selected electrode is supplying for future glucose level determination design.
研究领域:
分析化学
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生物传感器
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材料科学
·
电化学
✓ 已验证
DOI
高影响因子
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