Journal of Energy Storage
·
2023
·
IF 9.4
Haonan Zhang,Lin Fang,Yuanchao Guo,Zhongzhu Wang,Haibo Hu,Wen He,Peihong Wang
Supercapacitors (SCs) have attracted extensive attention due to the properties of high power density, long cycle life, and high rate performance. However, the high self-discharge is one giant challenge for long-term energy storage applications of SC. Herein, we prepared a high-performance SC with low self-discharge based on nitrogen-sulfur co-doped ZIF-8-derived (NS-PC) materials. The synergistic effects of high-temperature carbonization and nitrogen-sulfur (N-S) doping are systematically investigated. With a carbonization temperature of 900 °C, assisted with N-S doping, the maximum specific capacitance of the NS-PC-900//NS-PC-900 symmetrical SC is 42.7 F g −1 , while the power densities range from 650 to 13,000 W kg −1 at the energy densities of 10.04–7.5 Wh kg −1 . The specific capacitance remains 95.7 % even after 20,000 charge-discharge cycles. More importantly, the as-prepared NS-PC-900//NS-PC-900 SC exhibits an ultra-low self-discharge rate of solely 0.025 V h −1 within 24 h. This work provides a universal strategy to fabricate high-performance SCs with low self-discharge.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Manilath Nhoysaykham,Xin Wu,Yan Lin,Shaohua Wu,Xiang Li,Chunping Yang
The effective removal of common refractory antibiotics from livestock and poultry farming wastewater has attracted widespread attention. Developing high-performance adsorbents for the removal of antibiotics from wastewater is a highly promising method. Herein, a derivative from zeolitic imidazolate framework-8 (D-ZIF-8) was successfully prepared, characterized, and used for the adsorption of sulfamethoxazole (SMZ). Results showed that the D-ZIF-8 was a superior mesoporous adsorbent for antibiotic removal from wastewater, with a large specific surface area , pore size, and pore volume . Under suitable adsorption conditions, such as pH of 5.5, temperature of 25 ℃, initial concentration of SMZ of 10 mg/L, and D-ZIF-8 dosage of 0.1 g/L, the adsorption of SMZ on D-ZIF-8 could reach equilibrium at 5 h, and the removal efficiency and adsorption capacity of SMZ reached to 95.0% and 95.0 mg/g, respectively. Moreover, the D-ZIF-8 adsorbent also had good reusability. After 4 cycles, the adsorption capacity of SMZ on D-ZIF-8 remained at 93% of the initial adsorption capacity. In addition, the results of kinetic, adsorption isotherm , and thermodynamic analysis indicated that the adsorption of SMZ on D-ZIF-8 belonged to multi-layer chemical adsorption and was a spontaneous exothermic reaction . This investigation could provide an efficient method for the removal of refractory antibiotics from livestock and poultry farm wastewater.
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CELLULOSE
·
2021
·Vol. 28
·期 9
·5241-5256
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IF 5.044
Zhou Qian,Chen JunJie,Jin Bo,Chu Shijin,Peng Rufang
MOFs are confined to solid supports to overcome their inherent disadvantages of lightweight and submicron size, which pose challenges to the adsorption operation. ZIF-8 nanoparticles can be loaded onto bacterial cellulose (BC) in a simple manner, and subsequently carbonized at 700 °C to obtain a larger specific surface area (expressed as BC@ZIF-8 carbon aerogels (BZCA). SEM indicates that ZIF-8 was successfully self-assembled on bacterial cellulose. Various characterization techniques (SEM, TEM, FT-IR, XRD, BET, and XPS) indicated that BZCA had been successfully prepared, with a large specific surface area (220.45 m 2 /g) and sufficient functional groups (-NH-, -OH, Zn–O, N–O, and C = N-). The relationship of the adsorption of BZCA to UO 2 2+ with both contact time and initial concentration was then studied. Results showed that the adsorption of UO 2 2+ followed a pseudo-second-order kinetic model (R 2 = 0.999). After calculation, the maximum adsorption capacity of BZCA was 535 mg/g, which was comparable to or better than that of other adsorbents. The kinetic analysis disclosed that 70 min was enough for BZCA to reach the adsorption equilibrium. The adsorption mechanism of the prepared adsorbent on UO 2 2+ was studied by FTIR and XPS.
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CHEMICAL ENGINEERING & TECHNOLOGY
·
2020
·Vol. 44
·期 2
·265-272
·
IF 1.543
Yue Feng,Ning Guo,Shaojie Ren,Xuan Xie,Juan Xu,Yunkun Wang
Membrane fouling is a major hindrance to the effective application of polyethersulfone (PES) membranes. Synthetic silver nanoparticles @ zeolitic imidazolate framework-8 (AgNPs@ZIF-8) hybrid crystals were used to modify the PES microfiltration membranes for mitigating membrane fouling and better water permeability. The surface modification of AgNPs@ZIF-8 hybrid crystals improved the antifouling property of the membranes. The number of live bacteria in the bacteria suspension was over 90 % less than that of control membranes. Furthermore, after surface modification, the membrane permeability was enhanced, which was due to increased surface hydrophilization of the membranes which could partly explain the improved antifouling property. The results demonstrate that the use of AgNPs@ZIF-8 hybrid crystals is a feasible and attractive approach for the development of antifouling membranes.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Ruobing Yu,Zhicong Wu
In this study, by the application of the strong interaction between a metal-organic framework material and ofloxacin, ZIF-8 was proposed as an absorbent to remove ofloxacin from wastewater. The results demonstrated that ZIF-8 could remove 96.3 ± 1.1% of ofloxacin from the ofloxacin solution of 100 mg/L, and the maximum equilibrium adsorption capacity reached 194.1 ± 0.4 mg/g, which is superior to that of an adsorbent based on physical adsorption. The high specific surface area and strong interaction between ofloxacin and ZIF-8, including strong hydrogen bonding , complexation of unsaturated metals, and electrostatic interactions , contributed to the adsorption process . Moreover, the adsorption efficiency reached 80.2% after four adsorption cycles. The pseudo-second-order kinetics and Langmuir adsorption model can describe the adsorption of ofloxacin by ZIF-8. Therefore, ZIF-8 is a promising material for the treatment of wastewater containing ofloxacin.
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ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Weitao Xu,Huaming Feng,Weiwei Zhao,Chunhua Huang,Carl Redshaw,Zhu Tao,Xin Xiao
A new fluorescent chemosensor comprised of cucurbit[8]uril (Q[8]) and acridine hydrochloride (AC) has been designed and utilized for the recognition of amino acids . The AC was encapsulated by the Q[8] cavity and formed a 1:2 host-guest inclusion complex both in solution (aqueous) and in the solid-state. Whilst free AC is known to be strongly fluorescent, this strong fluorescence was quenched in the inclusion complex Q [8]-AC. This non-fluorescent complex Q[8]-AC was capable of serving as a fluorescence “off-on” probe, and was able to recognize either L -Phe or L -Trp via the competitive interaction between L -Phe or L -Trp. Moreover, the pH responsive nature of the probe allowed for the detection of basic amino acids, namely L -Arg, L -His, or L -Lys). As a result, a fluorescence method for the detection of five amino acids using a single system has been developed.
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ACS Biomaterials Science & Engineering
·
2020
·
IF 4.152
Xinting Cheng,Zhou Zhu,Yanhua Liu,Yiyuan Xue,Xiaomeng Gao,Jian Wang,Xibo Pei,Qianbing Wan
Bisphosphonates (BPs) are routinely administered for the treatment of turnover bone diseases. To avoid the undesirable adverse effects of long-term usage of bisphosphonates and improve their bioavailability in the bone microenvironment, we initially encapsulated risedronate (RIS) molecules inside nanoscale zeolitic imidazolate framework-8 particles (nZIF-8) by a one-step synthesis method to generate RIS@ZIF-8 nanoparticles. RIS@ZIF-8 nanoparticles displayed high loading encapsulation efficiency (64.21 ± 2.48%), good biocompatibility, controlled drug release capacity, and dual effects for bone regeneration. This work explored the potential of RIS@ZIF-8 nanoparticles, which could not only enhance ATP production, induce extracellular matrix (ECM) mineralization, and upregulate the expression levels of osteogenic genes but also effectively inhibit the formation of multinucleated giant osteocasts and decrease the Rankl/Opg ratio. Overall, RIS@ZIF-8 nanoparticles could be a very promising approach to synergistically enhance osteogenic and antiresorptive properties for bone regeneration, which could be utilized for the local treatment of bone defects.
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CHEMOSPHERE
·
2020
·
IF 5.778
Gehong Zhang,Jie Zhang,Pinghai Lv,Jian Sun,Pingge Zhao,Leilei Yang
Biofouling and organic fouling are major obstacles for polymeric membranes during application. In this work, zeolitic imidazolate framework-8@polydopamine (ZIF-8@PDA) nanoparticles were prepared by an aqueous synthesis strategy and incorporated into the polyamide (PA) selective layer to synthesize thin film nanocomposite membrane (TFN) during interfacial polymerization. The permeability and selectivity of the composite membrane were simultaneously improved with the introduction of ZIF-8@PDA. The water permeability of the TFN membrane increased to 3.74 ± 0.19 L/(m2·h·bar), which is 43.8% higher than that of the control membrane. Besides, the rejection of TFN membrane to sodium chloride is 98.68 ± 0.13%, which shows 0.99% increment than the unmodified membrane. Moreover, organic fouling and biofouling of the TFN membrane were also alleviated thanks to the introduction of the hydrophilic ZIF-8@PDA. The short-term filtration results indicate the performance of the TFN membrane is stable during operation.
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高影响因子
LANGMUIR
·
2020
·
IF 3.557
Mengdi Chen,Shaoyan Wang,Bingwen Hu
Significant progress has been made in the synthesis and application of core–shell nanoparticles in the past decade. But particle agglomerations are hard to avoid as the formation mechanisms of core–shell nanoparticles are still vague and not clear even for the simplest and most straightforward hard-templating method. Here, analytical ultracentrifugation (AUC) is applied to investigate the formation of polystyrene@ZIF-8 core–shell nanoparticles, as a model to understand the hard-templating method. It has been found that the concentration of the ZIF-8 precursor influences both the ZIF-8 shell formation and the agglomeration of the polystyrene (PS) template. An overdiluted ZIF-8 precursor is not suitable for ZIF-8 shell formation, while a highly concentrated ZIF-8 precursor causes strong aggregation of the PS core. By applying the optimal precursor concentration identified by AUC, well-dispersed polystyrene@ZIF-8 core–shell nanoparticles can be obtained.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 14
·5324-5332
·
IF 3.288
Jinfei Liu,Huijiao Qiu,Fei Zhang,Yan Li
In this study, a new magnetic composite material zeolitic imidazolate framework-8 coated Fe3O4@SiO2 (Fe3O4@SiO2/ZIF-8) was prepared by in situ growth of ZIF-8 on the surface of Fe3O4@SiO2 microspheres at room temperature. In addition, it had a large surface area, high superparamagnetism and great adsorption capacity. As is well known, MOFs have extraordinary adsorption capacity. As one of the classic MOFs, ZIF-8 has open metal sites, hydrophobic properties, and especially excellent water stability. Fe3O4 is generally used for the synthesis of different magnetic materials, which can make the preconcentrated material easy to separate from the extraction medium. All these features make the composite material Fe3O4@SiO2/ZIF-8 suitable to be developed as an adsorbent for preconcentration of bisphenols (BPs) including bisphenol F, bisphenol A, bisphenol B and bisphenol AP. Most of all, applying Fe3O4@SiO2/ZIF-8 to magnetic solid-phase extraction (MSPE) coupled with high performance liquid chromatography (HPLC) for detection of BPs can greatly improve the sensitivity of the method, and the process is simple and convenient. Under the optimal conditions, four BPs were detected with large linear ranges (0.05–200 μg L−1), low limits of detection (LODs) (10–15 ng L−1), relative standard deviations (RSDs) ranging from 2.0 to 4.5% and enrichment factors (EFs) ranging from 110 to 186. Additionally, the proposed method was applied to detect BPs in water and plastic packagings of food and drinks generally used in daily life.
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RSC Advances
·
2021
·Vol. 11
·期 46
·28863-28875
·
IF 3.361
Yu Qin,Li Xu,Liying Liu,Xiaoyu Deng,Yucheng Gao,Zhongwei Ding
A novel gas separation approach is proposed in this work by combining an amine-based solid adsorbent with a zeolitic imidazolate framework-8 (ZIF-8) membrane. This was achieved by incorporating the amine-based solid adsorbent during the fabrication of the ZIF-8 membrane on a macroporous substrate. An amine-based solid adsorbent was prepared using porous ZIF-8-3-isocyanatopropyltrimethoxysilane (IPTMS) and N-[(3-trimethoxysilyl)propyl]diethylenetriamine (3N-APS) amine compounds. The as-prepared porous amine-based solid adsorbent (denoted as ZIF-8-IPTMS-3N-APS) possessed excellent adsorptive CO2/N2 and CO2/CH4 separation performances. As the adsorbent needs to be regenerated, this could indicate that the CO2 adsorption separation process cannot be continuously operated. In this work, an amine-based solid adsorbent was applied during the preparation of the ZIF-8 membranes owing to the following reasons: (i) gas separation by the membrane can be operated continuously; (ii) the amino group provides a heterogeneous nucleation site for ZIF-8 to grow; and (iii) the reparation of surface defects on the macroporous substrate can be performed prior to the growth of the ZIF-8 membrane. Herein, the ZIF-8 membrane was successfully fabricated, and it possessed excellent CO2/CH4, CO2/N2, and H2/CH4 separation performances. The 0.6 μm ultrathin ZIF-8 membrane demonstrated a high CO2 permeance of 4.75 × 10−6 mol m−2 s−1 Pa−1 at 35 °C and 0.1 MPa, and ideal CO2/N2 and CO2/CH4 selectivities of 4.67 and 6.02, respectively. Furthermore, at 35 °C and 0.1 MPa, the ideal H2/CH4 selectivity of the ZIF-8 membrane reached 31.2, and a significantly high H2 permeance of 2.45 × 10−5 mol m−2 s−1 Pa−1.
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INTERNATIONAL JOURNAL OF LEGAL MEDICINE
·
2021
·Vol. 135
·期 6
·2263-2274
·
IF 2.686
Jiang Bowei,Qu Weifeng,Wang Feng,Zhang Liming,Rong Haibo,Li Jienan,Wen Dan,Zeye Moutanou Modeste Judes,He Wei,Wang Chudong,Xing Hao,Zhang Tao,Jin Chuan,Chen Li,Liu Ying,Cai Jifeng,Zha Lagabaiyila
DNA profiling of short tandem repeats (STRs) is the primary method for genotyping forensic samples. However, degraded DNA and trace samples are still major problems for commercial 5- or 6-dye STR kits. In order to improve the performance of this method, we developed a novel 8-dye STR multiplex system containing 18 autosomal loci (D3S1358, D1S1656, TPOX, D16S539, vWA, D6S1043, D2S1338, CSF1PO, D19S433, D7S820, FGA, D8S1179, D5S818, D13S317, TH01, D21S11, D12S391, and PentaD) and the sex-determining locus Amelogenin, with all fragments smaller than 330 bases. Validation was carried out as recommended by the Scientific Working Group on DNA Analysis Methods. The results showed that complete profiles were obtainable when the input DNA was as low as 0.0625 ng. Full profiles were obtained even in the presence of inhibitors such as humic acid (< 300 ng/μl), hematin (< 100 μM), and indigo (0.01%). The 8-dye STR multiplex system also showed good performance in the detection degraded DNA samples. These results indicate that the 8-dye STR multiplex system is suitable for human DNA genotyping, including for difficult forensic materials.
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