HYDROMETALLURGY
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2018
·
IF 3.3
Zhike Wang,Boshuang Zhang,Cunling Ye,Lingyun Chen
Metal organic frameworks (MOFs) have diverse applications in adsorption/separation fields. However, little is known about MOFs as adsorbents for the adsorption of Au(III) from aqueous solutions. In this work, a highly porous MOFs, ZIF-8, was modified by thiourea (TU) via coordination-based post-synthetic modification strategy. Compared with pristine ZIF-8, the TU functionalized ZIF-8, TU*ZIF-8, exhibited a remarkable Au(III) adsorption ability with a saturation adsorption capacity of 4262.8 mg/g although its surface area and pore volume decreased with TU loading. Interestingly, the adsorption efficiency of Au(III) was >99% with a broad Au(III) concentration range of 50–400 mg/L using only 20 mg TU*ZIF-8. Meanwhile, TU*ZIF-8 showed an encouraging selectivity for Au(III) in the presence of some metal ions such as Cu(II), Cr(VI), Pb(II), Cd(II), Mn(II), Mg(II), and Co(II). The improved adsorption of Au(III) on TU*ZIF-8 is explained by the synergistic effect of electrostatic interaction and coordination interaction. Particularly, the coordination interaction between Au(III) and TU of TU*ZIF-8 plays a major role in the Au(III) adsorption process of TU*ZIF-8. This work suggests a potential application of functionalized MOFs for the efficient recovery of gold from aqueous solutions.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Yanying He,Qizi Fu,Xiaopei Li,Linmiao Yin,Dongbo Wang,Yiwen Liu
Photocatalysis has been considered a promising method for environmental purification. However, powder nanomaterials are not suitable for large-scale application due to the limit of low recyclability and energy-intensive operation. Integrating and depositing powder photocatalysts on monolithic substrates may solve these issues. In this study, a ZIF-8 photocatalyst membrane and its derived product (ZnS photocatalyst membrane) was constructed by a facile in-situ treatment of cellulose-based substrate (take filter paper as an example). Both the two nanomaterials were confirmed to be tightly anchored to filter paper with the aid of chemical interaction. Under visible light irradiation, excellent dynamic-flow photocatalytic removal efficiencies of methylene blue (MB) degradation (97% within 80 min, k = 0.042 ± 0.002 min −1 ) and Cr(VI) reduction (100% within 60 min, k = 0.116 ± 0.007 min −1 ) were achieved by the prepared ZIF-8 photocatalyst membrane and its derived ZnS photocatalyst, respectively. Considering the high MB adsorption capacity and facile regeneration process of ZIF-8 photocatalyst membrane, the adsorption-degradation strategy was promising for its universal applications. The MB degradation pathway and photocatalytic mechanisms were also explored. Ultimately, a comprehensive discussion on the advantages and implications of prepared photocatalyst membranes for photocatalytic water treatment was rationally proposed. This study provided a promising method for water decontamination and demonstrated the significant superiority of monolithic membrane for photocatalytic water treatment.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Xu Wang,Rui Yao,Han Zhu,Zinan Zhang,Lifeng Zhang,Qiang Ma,Hua Jin,Yanshuo Li
Membrane separation has been well acknowledged as a forward-looking technology for hydrocarbon separation. Zeolitic imidazole framework-90 (ZIF-90) with effective pore size of 5.0 Å is a promising membrane material for hydrocarbon separation. Owing to the enormous challenges facing the fabrication process, the research on the ZIF-90 polycrystalline membrane is fairly underexplored. Herein we report a solvent-vapor-triggered crystallization strategy for the production of ZIF-90 membranes. The resultant ZIF-90 membrane had a typical polycrystalline membrane structure where the regular ZIF-90 grains propagated inside the whole porous support. Intriguingly, the membrane displayed two obvious sharp cut-off regions falling between the C 3 H 6 /C 3 H 8 and n- C 4 H 10 / i- C 4 H 10 gas pairs, respectively. The ZIF-90 membrane achieved ultrafast and selective permeation of C 3 H 6 from the C 3 H 6 /C 3 H 8 mixture. The C 3 H 6 flux was about 3.4 kg·m −2 ·h −1 which was comparable to the commercial NaA zeolite membrane for organic solvent dehydration. Further, the distinctive gas transport kinetic nature enabled the ZIF-90 membranes to exclude i -C 4 H 10 and thus harvest unprecedented n -/ i -C 4 H 10 separation ability in high-temperature regions. As the temperature elevated from 25 to 150 °C, the n- C 4 H 10 permeance was enhanced from 3.0 × 10 −9 to 12 × 10 −9 mol·m −2 ·s −1 ·Pa −1 and the n- C 4 H 10 / i- C 4 H 10 separation factors was improved from 63 to 95, respectively. The high permeance and permselectivity at industrially relevant high temperatures and pressures make ZIF-90 membrane attractive for industrial light hydrocarbon separation.
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Polymers
·
2024
·Vol. 16
·期 8
·1150
·
IF 4.7
Xinchao Wang,Jiale Hu,Jiajia Liu,Yixin Liang,Lan Wu,Tie Geng,Shihua Liu,Yonggang Guo
Polyether ether ketone (PEEK) is esteemed as a high-performance engineering polymer renowned for its exceptional mechanical properties and thermal stability. Nonetheless, the majority of polymer-based lubricating materials fail to meet the contemporary industrial demands for motion components regarding high speed, heavy loading, temperature resistance, and precise control. Utilizing 3D printing technology to design and fabricate intricately structured components, developing high-performance polymer self-lubricating materials becomes imperative to fulfill the stringent operational requirements of motion mechanisms. This study introduces a novel approach employing 3D printing technology to produce PEEK with varying filling densities and conducting in situ synthesis of zeolitic imidazolate framework (ZIF-8) nanomaterials on its surface to enhance PEEK’s frictional performance. The research discusses the synthetic methodology, characterization techniques, and tribological performance evaluation of in situ synthesized ZIF-8 nanomaterials on PEEK surfaces. The findings demonstrate a significant enhancement in frictional performance of the composite material under low-load conditions, achieving a minimum wear rate of 4.68 × 10−6mm3/N·m compared to the non-grafted PEEK material’s wear rate of 1.091 × 10−5mm3/N·m, an approximately 1.3 times improvement. Detailed characterization and analysis of the worn surface of the steel ring unveil the lubrication mechanism of the ZIF-8 nanoparticles, thereby presenting new prospects for the diversified applications of PEEK.
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PubMed
高影响因子
Biosensors-Basel
·
2024
·Vol. 14
·期 1
·38
·
IF 4.9
Qiaolin Fan,Xiao Li,Hui Dong,Zhonghua Ni,Tao Hu
Graphene and graphene-like two-dimensional layered nanomaterials-based photoelectrochemical (PEC) biosensors have recently grown rapidly in popularity thanks to their advantages of high sensitivity and low background signal, which have attracted tremendous attention in ultrahigh sensitive small molecule detection. This work proposes a non-enzymatic and visible-light-sensitive PEC biosensing platform based on ZIF-67@MoS2/rGO composite which is synthesized through a facile and one-step microwave-assisted hydrothermal method. The combination of MoS2and rGO could construct van der Waals heterostructures, which not only act as visible-light-active nanomaterials, but facilitate charge carriers transfer between the photoelectrode and glassy carbon electrode (GCE). ZIF-67 anchored on MoS2/rGO heterostructures provides large specific surface areas and a high proportion of catalytic sites, which cooperate with MoS2nanosheets, realizing rapid and efficient enzyme-free electrocatalytic oxidation of glucose. The ZIF-67@MoS2/rGO-modified GCE can realize the rapid and sensitive detection of glucose at low detection voltage, which exhibits a high sensitivity of 12.62 μAmM−1cm−2. Finally, the ZIF-67@MoS2/rGO PEC biosensor is developed by integrating the ZIF-67@MoS2/rGO with a screen-printed electrode (SPE), which exhibits a high sensitivity of 3.479 μAmM−1cm−2and a low detection limit of 1.39 μM. The biosensor’s selectivity, stability, and repeatability are systematically investigated, and its practicability is evaluated by detecting clinical serum samples.Keywords:ZIF-67;2D material;non-enzymatic;heterostructure;visible-light sensitive;photoelectrochemical biosensing
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ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Lidong Jiao,Mingshu Zhao,Zhou Su,Mangmang Shi,Min Li,Feng Li
Supercapacitors have received widespread attention from scientific researchers due to the advantages of high power density, fast charging/discharging rate and long cycle life. Among them, the development of high performance and high safety electrode materials are important research topics in the field of supercapacitors. Herein, zeolitic imidazolate framework (ZIF) derivatives is a good candidate material for supercapacitors electrode because of its controllable pore rate, constant cavity and larger specific area. However, the reunion phenomenon and the damaged structure during the reaction seriously affected its electrochemical properties, especially its stability. To solve this problem, the few-layer MXene was added into ZIF-67 to inhibit the reunion of single materials and the carbonization process was operated to improve its conductivity and structure stability. In addition, the CoNi 2 S 4 /carbon/MXene (CNS/C/MXene) obtained by the solvent thermal method successfully inherited the hollow cages structure and rough surface from the precursor, expressing a better electrochemical performance. In three-electrode system, the CNS/C/MXene electrode can exhibit the specific capacitance of 1221.6 F g −1 (169.7 mAh g −1 ) at 1 A g −1 and still maintain a high capacitance of 966.4 F g −1 (134.2 mAh g −1 ) at 20 A g −1 (79.1 % of the former). After assembling it with activated carbon into asymmetric supercapacitor, the device can provide a high energy density of 19.82 Wh kg −1 at a power density of 469.31 W kg −1 and maintain about 71.17 % of the initial capacitance after 30,000 cycles under a current density of 20 A g −1 , representing excellent cycle stability and rate capability.
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MOLECULES
·
2024
·Vol. 29
·期 8
·1833
·
IF 4.2
Chen Cheng,Hanyan Wu,Xinyang Chen,Shuiping Cai,Yingkang Tian,Xiaofei Yang,Xuejie Gao
Lithium–sulfur (Li-S) batteries have received much attention due to their high energy density and low price. In recent years, alleviating the volume expansion and suppressing the shuttle effect during the charge and discharge processes of Li-S batteries have been widely addressed. However, the slow conversion kinetics from polysulfide (LiPSs) to Li2S2/Li2S still limits the application of Li-S batteries. Therefore, we designed a ZIF-67 grown on cellulose (named ZIF-67@CL) as an electrocatalyst to improve the interconversion kinetics from LiPSs to Li2S2/Li2S for Li-S batteries. Based on the results of adsorption experiments of LiPSs, ZIF-67@CL and CL hosts were immersed in Li2S4solution to adsorb LiPSs, and the UV-Vis test was conducted on the supernatant after adsorption. The results showed that the ZIF-67@CL had a stronger adsorption for LiPSs compared with the cellulose (CL). Furthermore, in the Li2S nucleation tests, the fabricated cells were galvanostatically discharged to 2.06 V at 0.112 mA and then potentiostatically discharged at 2.05 V. Based on the results of Li2S nucleation tests, the catalytic effect of ZIF-67 was further verified. As a result, the sulfur cathode used a ZIF-67 catalyst (named S/ZIF-67@CL) and delivered an initial capacity of 1346 mAh g−1at a current density of 0.2 C. Even at a high current density of 2 C, it exhibited a high-capacity performance of 1087 mAh g−1on the first cycle and maintained a capacity output of 462 mAh g−1after 150 cycles, with a Coulombic efficiency of over 99.82%.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Xiang Li,Yanfei Chen,Baoliang Li,Gaowei Nie,Wenjie Huang,Hangran Pei,Wanying Han,Weili Shao,Jianxin He,Rongwu Wang,Xintao Yu,Diedie Wei,Dandan Chen,Yuping Xiong,Pengju Han
Oil–water separation is critical to ensuring the reliability of industrial oils. However, commonly used polymer separation materials can be difficult to degrade, contributing to white pollution. This study used electrospinning and seed-assisted in situ growth methods to combine the biodegradability of polylactic acid (PLA) with the high wettability and photocatalytic activity of a zeolitic imidazolate framework (ZIF-8). The resulting PLA@ZIF-8 nanofiber composites exhibited both efficient oil–water separation and self-cleaning contaminant removal abilities. The mild growth conditions of ZIF-8 and the seed-assisted method overcame the limitations regarding the in situ growth of metal–organic frameworks on PLA substrates. Experiments and COMSOL simulations revealed that the rough papillary structure of the ZIF-8 formed on the surface of the nanofiber membrane improved the oleophilicity and hydrophobicity of the PLA materials, thereby enhancing the oil–water separation performance, realizing a separation efficiency of >99.8% and maximum flux of 6280 L m–2 h–1. Under UV light irradiation, the composite membrane achieved a diesel degradation rate of 92.8%, thereby addressing the problem of reduced service life owing to fouling and pore blockage in current oil–water separation applications. The removal rate of the water-soluble pollutant methylene blue was 99.7%. Notably, the PLA@ZIF-8 membrane demonstrated excellent biodegradability and almost completely degraded after being buried in outdoor soil for 120 days, thereby avoiding white pollution. The proposed multifunctional membrane provides an efficient and environmentally friendly solution for industrial oil–water separation processes.
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MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Yiwen Li,Cuicui Hu,Shikuan Xu,Qi Guo,Pengfei Qi,Rong Li,Yanjun Xing
The removal of organic dyes from wastewater is crucial for environmental protection and water treatment. In this study, a ZIF-8/poly(vinyl alcohol) (PVA) composite was prepared for highly efficient dye adsorption using the contra-diffusion method. We investigated the conditions for ZIF-8-PVA to adsorb congo red (CR), including the influences of contact times, initial CR concentrations, pH values, and cyclic use. The results demonstrated that ZIF-8-PVA had a high Brunauer-Emmett-Teller (BET) surface area of 1704.03 m 2 /g. It exhibited a high removal efficiency of 98.43 % for CR, and its maximum adsorption capacity was 829.39 mg/g. After six cycles of adsorption, the removal efficiency of CR remained over 94.36 %. The removal efficiency of CR under a range of pH from 3 to 10 was consistently over 96.30 %. Moreover, ZIF-8-PVA also displayed adsorption capacity for various cationic and anionic dyes. The adsorption process aligned well with both the Langmuir model and the pseudo-second-order kinetic model. Based on FTIR, XPS, and swelling degree analyses, the adsorption mechanism was elucidated. Due to its universality and reusability, ZIF-8-PVA is suitable for practical application.
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IEEE SENSORS JOURNAL
·
2024
·Vol. 24
·期 5
·6078-6084
·
IF 4.3
Zhitao Duan,Fangrong Hu,Shangjun Lin,Jie Chen,Longhui Zhang,Mingzhu Jiang
Acetone gas can give rise to serious harm to the ecological environment and human health. In addition, acetone gas in the human exhaled breath can be used as an important biomarker for diabetes, lung cancer, lipid peroxidation, and other diseases. Therefore, detection of trace acetone gas is important for environment monitoring and disease diagnosis. Here, a four-split-ring-resonator terahertz (THz) metasurface sensor is proposed to detect trace acetone gas with high sensitivity, and the sample is fabricated using micromachining process. A new metal–organic framework (MOF) material zeolitic imidazolate framework-90 (ZIF-90) is modified on the surface of the sensor to improve its specificity for acetone gas. When the concentration increases from 10 to 100 ppm, the frequency shift of the sensor shows good linearity with the concentration. The minimum measurable concentration is 10 ppm, and the sensitivity is 0.1 GHz/ppm (or 10 ppm/GHz). This work paves a way for developing novel biosensors with high sensitivity and specificity, and it has potential applications in the fields of trace gas detection and disease diagnosis at early stage.
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Industrial Chemistry & Materials
·
2025
·
IF 11.9
Shenzhen Cong,Si Sun,YiJing Zhang,Ming Wang,Zhehua Jia,Jiaoyu Peng,Huan Pang
Metal-organic framework (MOF) membranes have received widespread research attention as a novel membrane material for H2/CO2 separation. The preparation of MOF membranes can be extended by constructing MOF membranes with homogeneous heterogeneous structure and the MOF membranes with high permeance and high selectivity can be prepared. Here, we use the chelation-assisted interfacial growth process to construct a seeding layer, and then prepare Co-Zn-ZIF-L membranes with homogeneous heterogeneous structure by secondary growth for the efficient separation of H2/CO2. The resulting Co-Zn-ZIF-L membranes show an H2 permeances of 2156 GPU and the H2/CO2 selectivity of 31.6 at 298K and 1.0 bar, surpassing the Robeson upper bond (2008). Furthermore, the Co-Zn-ZIF-L membrane has a H2/CO2 separation stability of 65 h and can efficiently separate to obtain pure H2.
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DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Zheng Guo,Hekai Zhang,Yunfei Song,Minghuan Wang,Jiying Wang,Qing Miao,Peng Wei,Li Yin
The development of efficient adsorbents for removing toxic organic dyes from wastewater remains a critical challenge in environmental remediation. Herein, novel carbon nanofibers (CNFs) supported ZIF-8 hybrid composite (CNFs@ZIF-8) was synthesized via an in-situ growth method and evaluated for its malachite green (MG) adsorption performance. The composite exhibited a porous structure with a high specific surface area (1154.18 m 2 /g) and abundant functional groups, enabling exceptional adsorption capacity (2384.13 mg/g). Systematic studies revealed that the adsorption mechanism involved synergistic electrostatic interactions, π-π stacking, with the process fitting the Langmuir isotherm and pseudo-second-order kinetic models. Remarkably, CNFs@ZIF-8 demonstrated pH-responsive selectivity toward cationic dyes, achieving removal efficiencies of >90 % for MG, methylene blue (MB), and rhodamine B (RhB), while showing minimal affinity for anionic methyl orange (MO). Thermodynamic analysis confirmed the spontaneous (ΔG 0 < 0) and endothermic (ΔH 0 = 71.49 kJ/mol) nature of adsorption. The composite maintained structural stability over five regeneration cycles, highlighting its potential for sustainable wastewater treatment. This work provides a strategy to overcome the limitations of pure MOFs by integrating carbon substrates, offering a multifunctional adsorbent with scalable applications in addressing complex dye-polluted effluents.
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