TRIBOLOGY INTERNATIONAL
·
2019
·
IF 3.517
Xiaojing Ci,Wenjie Zhao,Jun Luo,Yangmin Wu,Tianhao Ge,Lu Shen,Xiulei Gao,Zhiwen Fang
Fluorographene could be used as lubricating additive which is attributed to its high mechanical strength and unique layered structures. However, it is difficult to disperse fluorographene uniformly in base oil due to its low surface energy. Here, we formulated multilayered fluorographene nanosheets (FG i ) by fluorinating graphene and then exfoliated the FG i using chloroform to obtain fluorographene (FG). Tribological results indicated that the coefficient of friction and the wear rate of GTL-8 nanolubricant oil enhanced with 0.3 mg/ml FG were decreased by 35% and 90%. Combining Transmission Electron Microscope images and X-ray photoelectron spectra, it is illustrated that physical transferred film and tribochemical film were generated which were beneficial for the excellent tribological performances of GTL-8 based oil enhanced via FG.
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 20
·5412-5419
·
IF 5.976
Pengyuan Wang,Xiaoqin Zou,Huaqiao Tan,Sheng Wu,Lingchang Jiang,Guangshan Zhu
Gas sensing performances in ZnO sensors are critically limited by their fast electron–hole recombination, low gas selectivity and elevated operation temperature. To alleviate these problems, new and high-performance sensor materials are desirable. Herein, we fabricate a core–shell composite material of POM@ZIF-8@ZnO with an ultrathin ZIF-8 film containing H5PMo10V2O40 polyoxometalate on the ZnO substrate surface. The device based on this composite exhibits an improved gas sensing ability toward formaldehyde (HCHO) at room temperature (25 °C) with a sensitivity of ∼0.4 ppm. Additionally, the POM@ZIF-8@ZnO material exhibits selective gas responses for reducible gases with small molecular sizes, in particular for a selectivity value of 15.0 for formaldehyde over ethanol. The specific roles of the ZIF-8 shell and POM are discussed in detail: ZIF-8 is responsible for concentrating and recognizing analyte molecules on the ZnO surface, and POM accounts for enhancing the sensing ability. The new material of POM@ZIF-8@ZnO with high performance holds great promise in sensor materials for selective formaldehyde sensing.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Liang Wang,Chengxin Wang,Haifei Wang,Xinyan Jiao,Yu Ouyang,Xifeng Xia,Wu Lei,Qingli Hao
Sandwich-like ZIF-8 nanocrystal derived N-doped carbon decorated graphene sheets are developed through in-situ growth and followed by a thermal annealing treatment. The sandwich-like N-doped carbon decorated graphene sheets (NCGs) contain graphene substrate and the carbon nanoparticles with 30–50 nm in size. The sandwich-like NCGs generate a large specific surface area of 816.4 m 2 g −1 . With the high surface area and nitrogen doping, the as-fabricated NCGs as electrode materials for supercapacitor exhibit high specific capacitance of 225.0 F g −1 at 0.5 A g −1 , an enhanced rate capability and excellent electrochemical stability with 96.8% retention after 10000 cycles even at 10 A g −1 . The symmetry supercapacitor based on NCGs delivers an energy density of 12.7 Wh kg −1 at a specific power of 447 W kg −1 . When the power density increases to 15126 W kg −1 , the energy density can still keep 6.5 W h kg −1 . Furthermore, the symmetry supercapacitor shows an excellent cycle stability with 96.6% capacitance retention at 2 A g −1 after 10000 cycles.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Xu Yan,Mengmeng Song,Mo Zhou,Chunlian Ding,Zhongren Wang,Yunyan Wang,Weichun Yang,Zhihui Yang,Qi Liao,Yan Shi
CuO nanoparticles (NPs) released into aqueous environments induce metal toxicity, which generally exerts negative effects on various organisms and leads to great challenge for wastewater biotreatment. In this study, a promotion effect of CuO NPs on biological process was first found. Cr(VI) reduction by Cupriavidus basilensis B-8 (hereafter B-8) was enhanced in the presence of CuO NPs. The efficiency of Cr(VI) bioreduction was much higher with B-8 and CuO NPs (approximately 100%) than with B-8 (approximately 37.6%) and CuO NPs (39.9–44.7%) alone, indicating a stimulatory effect of CuO NPs on Cr(VI) reduction by B-8. Our material analyses revealed different response mechanisms of B-8 to Cr(VI), with and without CuO NPs. The addition of CuO NPs influenced the interaction of Cr(VI) with the N-, P-, S-, and C-related functional groups of B-8. Transcriptomic analysis indicated that multiple mechanisms, including Cr(VI) uptake and reactive oxygen species detoxification, were induced by Cr(VI). Many genes involved in various metabolic processes were significantly upregulated by the addition of CuO NPs. To a certain extent, the pressure of DNA repairment by B-8 induced by Cr(VI) was also alleviated by the presence of CuO NPs. They contributed to facilitate B-8 growth and enhance Cr(VI) reduction, even with 50 mg/L Cr(VI). This study not only elaborated the mechanisms of bacterial Cr(VI) reduction when enhanced by CuO NPs, but also provided a novel perspective for wastewater biotreatment.
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PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2018
·
IF 3.649
Matteo Ciprian,Peng Xu,Somboon Chaemchuen,Rong Tu,Serge Zhuiykov,Philippe M. Heynderickx,Francis Verpoort
For the first time, MoO 3 nanoparticles (NPs) with a size ranging from 1.5 to 60 nm were deposited on spray dried zeolitic imidazolate framework-8 (ZIF-8) by rotary chemical vapor deposition (RCVD) in order to improve its photocatalytic performance. A direct effect of the deposition time on the metal oxide loading was observed. In a time frame between 0.9 and 2.7 ks the metal oxide loading can be increased from 1 to 3 wt%. All the MoO 3 -NPs/ZIF-8 catalysts were tested towards the methylene blue photodegradation using sunlight. MoO 3 -NPs/ZIF-8 3 wt% RCVD reached a conversion of 82% and 95% after 180 and 300 min, respectively.
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CRYSTENGCOMM
·
2014
·Vol. 16
·期 38
·8994-9000
·
IF 3.858
Tiantian Xing,Yongbing Lou,Qilong Bao,Jinxi Chen
Nanocrystals of ZIF-8 have been successfully prepared in the presence of non-ionic triblock copolymers P123 and F127 under microwave irradiation. Noticeably, the reaction time could be significantly reduced down to 1 min. The obtained ZIF-8 nanocrystals had sizes of sub-104 nm and exhibited a high BET surface area of 1599 m2 g−1. This approach is expected to be an efficient and environmentally friendly method for the preparation of ZIF-8.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Min Jiang,Xueping Cao,Dandan Zhu,Yongxin Duan,Jianming Zhang
A core-shell structure composite, zeolitic imidazolate framework @ cetyltrimethylammonium bromide (ZIF-8@CTAB) was synthesized by CTAB micelle controlling the growth of ZIF-8 in aqueous systems. Direct carbonization of ZIF-8@CTAB at a high temperature produced the nitrogen-doped hierarchically porous carbon (named as PC1000@C). In comparison with the carbonization product of pure ZIF-8 (named as PC1000), PC1000@C possesses the higher specific surface area and two-times larger total pore volume. The results from elemental analysis shows the higher N content in PC1000 sample, while X-ray photoelectron spectroscopy curve-fitting shows the higher quaternary-N content in PC1000@C sample. The hierarchical microporous/mesoporous structure, high surface area and favorable N species in PC1000@C play an active role in catalyzing oxygen reduction reaction (ORR). The specific capacitance of porous carbon was calculated from the galvanostatic-discharge curve. PC1000@C exhibits a large specific capacitance of 225 F g −1 at a current density of 0.5 A g −1 and still retains 92% of initial capacitance after 1000 galvanostatic charge-discharge cycles.
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JOURNAL OF SEPARATION SCIENCE
·
2016
·Vol. 40
·期 4
·954-961
·
IF 2.741
Yilin Li,Tao Bao,Zilin Chen
In this work, we developed a capillary column modified with zeolitic imidazolate framework-8 as a novel stationary phase for open-tubular capillary electrochromatography. To immobilize zeolitic imidazolate framework-8 onto the inner surface of silica capillary, a bio-inspired polydopamine functionalization was used to functionalize the capillary surface with polydopamine. First, a polydopamine layer was assembled inside the capillary. Second, due to noncovalent adsorption and covalent reaction ability, polydopamine could attract and anchor zeolitic imidazolate framework-8 onto the inner surface of capillary. It has been demonstrated that zeolitic imidazolate framework-8 was successfully grafted on the inner wall of the capillary by scanning electron microscopy, and Fourier transform infrared spectroscopy. The electro-osmotic flow characteristics of capillaries were also investigated by varying the pH value and acetonitrile content of mobile phase. The zeolitic imidazolate framework-8 coating not only increased the phase ratio of open-tubular column, but also improved the interactions between tested analytes and the stationary phase. Three groups of isomers including acidic, basic, and neutral compounds were well separated on the zeolitic imidazolate framework-8 bonded column, with theoretic plate numbers up to 1.9 × 10 5 N for catechol. The repeatability of the prepared columns was also studied, and the relative standard deviations for intra- and interday runs were less than 5%.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yebin Guan,Juanjuan Shi,Ming Xia,Jun Zhang,Zhenfeng Pang,Alessandro Marchetti,Xiaohong Wang,Jingsong Cai,Xueqian Kong
Monodispersed zeolitic imidazolate frameworks (ZIFs) were prepared with a simple method using dimethylsulfoxide (DMSO) as solvent. This method yields ZIF-8 nanoparticles with a narrow particle size distribution of 90–110 nm and the dispersion is highly stable against agglomeration. These particles have larger nanosized porosity and enhanced CO 2 adsorption capability compared to ZIF-8 prepared with different solvents such as methanol or N , N -dimethyl formamide. Their uniform size and surface chemistry also lead to superior performance in the Knoevenagel condensation reactions. The ZIF-8 nanoparticles possess high thermal stability up to 550 °C and the preparation steps are easy for scaling up which are favorable for industrial applications.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2017
·Vol. 32
·期 2
·e4062
·
IF 2.319
Bibimaryam Mousavi,Somboon Chaemchuen,Chizoba I. Ezugwu,Ye Yuan,Francis Verpoort
We demonstrate the synthesis of isostructural zeolitic imidazole framework (ZIF-8) using four distinct synthetic methods. Subsequently, the variations in physicochemical properties were analyzed through the catalytic reaction of CO 2 cycloaddition of epoxide. It was thus demonstrated that simply by changing the type of synthetic method for the preparation of ZIF-8, the physicochemical properties were changed significantly which in turn influenced the catalytic activity of ZIF-8. It was found that the synthetic method affected the crystal growth and consequently influenced the physicochemical properties which are crucial aspects in metal–organic framework applications. There is an almost exponential relationship between the reactivity of various ZIF-8 samples in CO 2 cycloaddition of epoxide and the surface area, CO 2 adsorption and pore volume.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Wei Li,Linghao Wang,Menghao Lin,Li Chen,Xinjuan Zeng,Lichun Dong,Cailong Zhou
Mixed matrix membranes (MMMs) have emerged as a promising solution for the treatment of dye wastewater. A key challenge in advancing MMMs is how to effectively integrate two nanofillers with distinct advantages to mitigate the limitations of single-nanofiller systems. In this study, we present a binary nanofiller strategy, utilizing metal–organic frameworks (MOFs) and covalent organic frameworks (COFs), to fabricate polyvinylidene fluoride (PVDF) based MMMs. By systematically adjusting the mass ratio of ZIF-8 MOF and TFB-BD(Me) 2 COF, the separation efficiency of membranes for dyes with different charges, capitalizing on the molecular sieving properties of MOFs and the superior compatibility of COFs was evaluated. The optimized membrane demonstrated a rejection of 91.66% for Congo red (CR), along with a water permeance of 641.9 L m −2 h −1 bar −1 . This work represents a novel attempt in the design of binary-nanofiller MMMs, offering new insights into the synergistic effects of hybrid nanofillers in membrane technology.
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MOLECULES
·
2025
·Vol. 30
·期 7
·1413
·
IF 4.6
Tao Tang,Haoran Zhang,Hexu Wang,Xiaoyu Dou,Jianfeng Wen,Li Jiang
The development of green, efficient, and reusable photocatalysts is important for pollution degradation. In recent years, Cs3Bi2I9has been shown to be an effective photocatalyst. However, the rapid recombination of electrons and holes weakens the photocatalytic activity. In this work, the photogenerated electron transfer rate was promoted by ZIF-8 compositing with Cs3Bi2I9, which effectively improved the pollutant degradation. After 50 min of visible light irradiation, Cs3Bi2I9/ZIF-8 removed up to 98.2% of methylene blue (MB), which was 4.15 times higher than that of Cs3Bi2I9alone. In addition, the Cs3Bi2I9/ZIF-8 composite still exhibited high photocatalytic activity after three cycling experiments. Our research offers a simple and efficient method for enhancing the photocatalytic activity of lead-free halide perovskites.
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