CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2023
·
IF 3.9
Xiangyang Liu,Longhui Fang,Jin Wang,Sihan Huang,An Li,Hui Liu,Zhuoyang Lu,Jiangang Long,Maogang He
R410A is a high GWP (2088) refrigerant blend soon to be eliminated, consisting of equal mass of difluoromethane (R32) and pentafluoroethane (R125). R32 is a good additive to the next generation refrigerant hydrofluoroolefin due to low GWP (675) and superior thermodynamic properties. But the separation of R32 and R125 by conventional distillation is a challenge because of their near boiling points. In this study, innovative membranes combining metal-organic framework (MOF) and ionic liquid (IL) are applied to the recovery of valuable R32 from R410A and demonstrate excellent R32/R125 separation performance. [C 2 mim][BF 4 ] was embedded into the nanocages of ZIF-8 through a impregnation strategy to prepare ZIF-8@[C 2 mim][BF 4 ]/Pebax mixed-matrix membranes (MMMs). Characterization results confirmed that IL was successfully added to the nanocages of ZIF-8. ZIF-8@[C 2 mim][BF 4 ]/Pebax MMMs with 10 wt% loading exhibits the best separation performance, increasing R32 permeability and R32/R125 selectivity by 177% and 150% compared to neat Pebax membrane. The ZIF-8 @ [C 2 mim][BF 4 ] material by impregnation has excellent performance in regulating the effective cage size of MOF, providing new strategies for designing more accurate and efficient MMMs.
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SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Yi Huang,Chenyang Zhao,Yue Li,Chen Wang,Wenlin Yuan,Tao Shen,Jie Liu,Di Cheng,Chunchun Wu,Qianhong Shen,Hongliang Ding,Siyuan Chen,Hui Yang
Integration of both passive and active corrosion-protecting mechanisms is an effective method for endowing sol-gel derived coatings with long-term anticorrosion performance. To provide “smart” functionality for sol-gel coating, a novel self-healing nanocontainer is fabricated via the in-situ growth of 1H-benzotriazole-inbuilt zeolitic imidazolate framework (BTA-ZIF-8) on hydroxylated hexagonal boron nitride nanosheets (BN-OH), which exhibits efficient pH-dependent inhibitor release behavior at both acidic and alkaline media. Electrochemical measurements reveal that sol-gel coating containing the BTA-ZIF-8@BN-OH nanocontainers exhibits superior anticorrosion performance and long-term corrosion protective capability, with |Z| 0.01Hz increased by nearly three orders of magnitude (∼2 × 10 8 Ω·cm 2 ) compared to that of pure sol-gel coating after 28 days of saline solution immersion. In addition, the EIS measurements on sol-gel coating surfaces with artificial scratches show increased impedance values after prolonged immersion in saline solution, indicative of effective active inhibiting effect. This phenomenon is the result of the synergistic effect of both passive and active corrosion protection . The active protection (inhibiting effect) is provided by the on-demand release of inbuilt BTA inhibitor from ZIF-8 frameworks, whereas the passive protection (barrier performance) is achieved through the “labyrinth effect” of BN-OH nanosheets as well as the improved interfacial compatibility of nanocontainers with surrounding sol-gel matrix by surface hydroxylation of h-BN nanosheets. This nanocontainer design offers a facile strategy for fabricating self-healing sol-gel coatings with the exceptional anticorrosion properties.
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CHEMOSPHERE
·
2021
·
IF 7.086
Lingshuai Zeng,Danqi Cheng,Zhenxing Mao,Yikai Zhou,Tao Jing
Novel halogenated flame retardants (HFRs) have attracted much attention due to their environmental hazard and adverse effects on human health. In this study, a sensitive and simultaneous method for the determination of six novel HFRs was developed, including tetrabromobisphenol A (TBBPA), tetrachlorobisphenolA, TBBPA bis(2-hydroxyethyl ether), TBBPA bis(allyl ether), TBBPA bis(2,3-dibromopropyl ether) and 2,4,6-tris(2,4,6-tribromophenoxy)-1,3,5-triazine. ZIF-8 modified nitrogen-doped reduced graphene oxide (ZIF-8@N-rGO) was synthesized and coated onto a syringe filter to prepare a thin film microextraction (TFME) device. The adsorption capacities of ZIF-8@N-rGO for novel HFRs ranged from 50.98 to 112.84 mg g −1 , exhibiting good extraction efficiency through a combination of π-π, hydrophobic, and hydrogen bonding interactions. The TFME device was coupled to a high-performance liquid chromatography-ultraviolet detection system to simultaneously determine target HFRs in crayfish-aquaculture water systems. Under the optimal extraction parameters, the linearities ranged from 0.1 to 100 ng mL −1 . The method detection limits ranged from 0.030 to 0.14 ng mL −1 and relative recoveries ranged from 88.6 to 106.2%. We found that novel HFRs were detected in water and crayfish samples and were primarily distributed in the viscera and head shell of the crayfish. The bioconcentration factors ranged from 0.25 to 19.20 L kg −1 , indicating non-bioaccumulation in the crayfish. This study provides valuable technology and information for potential health risks of exposure to novel HFRs from consuming crayfish.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 8
·3194-3204
·
IF 3.665
Hong-yan Niu,Li-qin Cao,Xu-le Yang,Kai-nan Liu,Lu Liu,Ji-de Wang
Here, the ZnO/polyacrylamide (ZnO/PAM) macroporous composite monolith was first prepared through the radical polymerization of acrylamide in ZnO-costabilized CO 2 -in-water Pickering high internal phase emulsions (HIPEs). An efficient and green synthesis method was used to prepare the ZnO/PAM porous precursor materials, and ZnO nanoparticles (NPs) were used as a metal ion source to grow the metal organic frameworks (MOF) phase through secondary recrystallization, thereby synthesizing the target MOF/PAM porous monolith. The effects of the contents of ZnO NPs on the formation of HIPEs and properties of the target MOF/PAM composites for the photocatalytic degradation of cationic dye were studied. As the content of ZnO NPs increased to 3.75 wt%, the composite monolith had high mechanical stress (0.24 MPa) at 80% strain and recovered their shape. The as-synthesized ZIF-8/PAM composites were characterized using X-ray diffraction, scanning electron microscope (SEM), Brunauer Emmett Teller (BET), energy dispersive X-ray spectrometer (EDS) mapping, and TG methods. SEM images showed that the hybrid materials were interconnected, and the sizes of the open macropore and interconnected pore throats were 30–125 and about 2–20 μm, respectively. In addition, the ZIF-8/PAM material could be used as a high-efficiency photocatalyst to remove the cationic dye at a fast rate (88.6%).
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Jie Yue,Meng Yuan,Xuan Zhang,Guochang Wen,Guina Ren,Bo Ge,Limin Zhao,Xin Shao
Due to its porous structure, hydrophobic modified three dimensional melamine sponge (MS) was commonly used for high efficiency oil/water separation. Nevertheless, it does nothing to water-soluble pollutants. In order to deal with residual pollutants, the direct Z-scheme BiOI/CdS composites was constructed and loaded onto the melamine sponge which easily achieved efficient degradation and selective deoiling. Furthermore, traditional hydrophobic methods (such as grafting mercaptan, silanes and so on) had several drawbacks, hence a novel metal organic frame material ZIF-8 was adopted in order to attain the purpose of superhydrophobic . In this work, it has shown that the cyclic photodegradation efficiency of superhydrophobic BiOI/CdS/ZIF-8 melamine sponge (BCZ MS) could still achieve 92% after performing 4 cycles of degradation and the results indicated that BCZ MS has preeminent stability. Besides, it was verified by the capture experiment that the main active species was O 2 − .
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Journal of Advanced Research
·
2020
·
IF 6.992
Tengfei Li,Meng Lu,Yuhang Gao,Xiaodong Huang,Guangyang Liu,Donghui Xu
In this study, a novel metal-organic framework (M-ZIF-8@ZIF-67) was successfully prepared using the single layer Fe 3 O 4 -ZIF-8 as magnetic core and wrapped a layer of ZIF-67 outer. This M-ZIF-8@ZIF-67 was employed as an adsorbent for the adsorption and removal of fipronil and its metabolites from environmental water and cucumber samples. The characterization results suggested that M-ZIF-8@ZIF-67 has the double layer structure a polyhedral structure with uniform pores, while ZIF-67 was successfully coated on the surface of Fe 3 O 4 -ZIF-8. The unique structure endowed M-ZIF-8@ZIF-67 a high surface area (219 m 2 /g) and high adsorption capacity for fipronil, fipronil desulfinyl, fipronil sulfide and fipronil sulfone. To our knowledge, this is the first report detailing the adsorption properties of M-ZIF-8@ZIF-67 with double layer structure relating to the adsorption and removal of pesticides. Furthermore, the adsorption model analysis demonstrated that the static adsorption data fitted the Freundlich bimolecular layer adsorption model better than the Langmuir monolayer adsorption model. This study indicates that M-ZIF-8@ZIF-67 has significant potential in the adsorption and removal of fipronil and its metabolites in water and vegetable samples.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 40
·14408-14420
·
IF 7.393
Shuangxi Yuan,Sining Yun,Yongwei Zhang,Jiaoe Dang,Menglong Sun,Changwei Dang,Yingying Deng
Constructing cost-effective and robust counter electrodes (CEs) without noble metals remains a challenge for the commercialization of current dye-sensitized solar cells (DSSCs). In this study, we focus on the built-in zinc element into the zeolitic imidazolate framework (ZIF-8) to construct a composite of dual-phase zinc selenide (ZnSe) encapsulated by the size-reduced ZIF-derived Se/N-doped carbon (PS N-CSR) using a post-selenization procedure. Benefitting from the enhanced synergy and charge transfer between the small-sized doped carbon skeleton and well-dispersed dual-phase ZnSe active sites, the resultant PS N-CSR exhibited superior catalytic activity and durability to the triiodide reduction reaction (IRR). The devices that utilize PS N-CSR CE achieved a high power conversion efficiency of 8.48%, surpassing that of Pt (7.20%). It is expected that this work will provide an extensible pathway for designing efficient hybrid electrocatalysts with beneficial structures containing transition metal compounds based on ZIF analogs.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 43
·16819-16828
·
IF 3.069
Guiling Luo,Ying Deng,Xiaoping Zhang,Ruyi Zou,Wei Sun,Binghang Li,Bi Sun,Yubao Wang,Guangjiu Li
A voltammetric sensor was developed using a nitrogen-doped porous carbon and nitrogen-doped graphene nanocomposite modified glassy carbon electrode for the simultaneous determination of dopamine (DA), uric acid (UA) and ascorbic acid (AA). Detailed characteristics of the nanocomposites were investigated by SEM, TEM, XPS, XRD and FT-IR. Experimental conditions such as accumulation time, accumulation potential and buffer solution pH were optimized. The sensor demonstrated a linear plot of 0.01–15.0 mmol L−1 for AA, 0.08–350.0 μmol L−1 for DA, and 0.5–100.0 μmol L−1 for UA, with detection limits of 1.99 μmol L−1, 0.011 μmol L−1 and 0.088 μmol L−1, respectively. The established method exhibited excellent reproducibility, anti-interference and stability, and it was applied to DA, UA and AA determination in real urine samples with recoveries between 100.2% and 102.0%.
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ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 35
·1802830
·
IF 13.325
Huiyuan Zhang,Qian Li,Ruiling Liu,Xinke Zhang,Zhonghao Li,Yuxia Luan
Zeolitic imidazolate framework-8 (ZIF-8) is an attractive metal organic framework (MOF) in drug delivery. Strong interaction between drugs and ZIF-8 is essential for high drug loadings through in situ construction of MOFs. However, only limited drugs with unique functional groups ( COOH, SO 3 H, et al.) can interact with ZIF-8 and be encapsulated satisfactorily so far. Drugs without these functional groups are difficult to be loaded due to the lack of strong interaction. Herein a versatile prodrug strategy is proposed to solve the problems encountered by MOFs. Cytarabine (Ara) is chosen as a model drug since it cannot be loaded in ZIF-8 satisfactorily by itself. New indocyanine green (IR820) is utilized to bond with Ara for the formation of prodrug (Ara-IR820) and endows the prodrug with fluorescence imaging-guided chemo-photothermal therapy, in which sulfonic groups strengthen the interaction between prodrug and ZIF-8. This prodrug loaded ZIF-8 is further functionalized with hyaluronic acid (HA) to result in active-targeting HA/Ara-IR820@ZIF-8 nanoparticles. The in vitro and in vivo results demonstrate its excellent visual cancer therapy with tumor-targeted and pH-responsive release behavior. This design offers a new concept to solve the drug loading problem of MOFs, exhibiting a flexible strategy to expand the biomedical applications of MOFs.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Mengbo Wu,Qingrong Zheng
Enhancing the storage capacity of hydrogen on MOFs and making it suitable for the marine environment are crucial to its onboard application as a hydrogen storage medium. Development of the storage medium was based on the density of hydrogen contained within the storage system equipped on a typical fuel cell powered ship. The researches conducted include density functional theory (DFT) calculations and experiments, which were directed to evaluate the effect of incorporating graphene oxide (GO) on enhancing the storage performance of hydrogen on ZIF-8. DFT calculations were performed to determine adsorption energies between the GO@ZIF-8 composites and hydrogen molecules, the reduced density gradient (RDG) scatter plot and isosurface map analysis were then employed to define the interaction mechanism between the GO and ZIF-8 as well as the GO@ZIF-8 composites and hydrogen molecules. Precipitation was employed at ambient temperature to synthesize the ZIF-8 sample and GO@ZIF-8 composites, which were performed the tests further for analyzing adsorption equilibrium as well as the performances of cycling and hydro-stability. Results show that the interaction between the GO and ZIF-8 as well as the GO@ZIF-8 composites and hydrogen molecules can be ascribed to the van der Waals force, and the interaction can be enhanced by incorporating a suitable amount of GO. Within the range 0–8 wt% amount of GO incorporated, the sample added by 2 wt% GO (GO-2@ZIF-8) had a more preferable structure for hydrogen adsorption, and the isosteric heat of hydrogen adsorption on this sample is larger than that on the ZIF-8. It also shows that the incorporation brought about the enhancement on the cycling performance at 77.15 K within 0–5 MPa as well as on the hydro-stability of the sample. It suggests that the composite prepared by incorporating ZIF-8 with GO is a promising medium for on board hydrogen storage.
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LANGMUIR
·
2024
·
IF 3.7
Longyu Liu,Xueqiu Liu,Xinyi Lu,Xinmiao Guo,Xi Chen,Weiping Li,Xiaobin Yu,Zhiqiang Cheng
Matrine (MT) is a kind of alkaloid extracted from Sophora and is a promising substitute for chemical nematicides and botanical pesticides. The present study utilized sodium alginate (SA), zeolite imidazole salt skeleton (ZIF), and MT as raw materials to prepare a pH-response-release nematicide through the electrostatic spray technique. Zinc metal–organic framework (ZIF-8) was initially synthesized, followed by the successful loading of MT. Subsequently, the electrostatic spray process was employed to encapsulate it in SA, resulting in the formation of MT/ZIF-8@SA microcapsules. The efficiency of encapsulation and drug loadings can reach 79.93 and 26.83%, respectively. Soybean cyst nematode (SCN) is one of the important pests that harm crops; acetic acid produced by plant roots and CO2 produced by root respiration causing a decrease in the pH of the surrounding environment, which is most attractive to the SCN when the pH is between 4.5 and 5.4. MT/ZIF-8@SA releases the loaded MT in response to acetic acid produced by roots and acidic oxides produced by root respiration. The rate of release was 37.67% higher at pH 5.25 compared with pH 8.60. The control efficiency can reach 89.08% under greenhouse conditions. The above results demonstrate that the prepared MT/ZIF-8@SA not only exhibited excellent efficacy but also demonstrated a pH-responsive release of the nematicide.
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高影响因子
JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
·
2024
·
IF 3.6
Chongwen Ren,Qingqing Tu,Jinchao He
Glioma cancer is the primary cause of cancer-related fatalities globally for both men and women. Traditional chemotherapy treatments for this condition frequently result in reduced efficacy and significant adverse effects. This investigation developed a new drug delivery system for the chemotherapeutic drug temozolomide (TMZ) using pH-sensitive drug delivery zeolitic imidazolate frameworks (ZIF-8). These nanoplatforms demonstrate excellent biocompatibility and hold potential for cancer therapy. Utilizing the favorable reaction milieu offered by ZIFs, a ‘one-pot method’ was employed for the fabrication and loading of drugs, leading to a good capacity for loading. TMZ@TA@ZIF-8 NPs exhibit a notable response to an acidic milieu, resulting in an enhanced drug release pattern characterized by a controlled release outcome. The effectiveness of TMZ@TA@ZIF-8 NPs in inhibiting the migration and invasion of U251 glioma cancer cells, as well as promoting apoptosis, was confirmed through various tests, including MTT (3-(4,5)-dimethylthiahiazo(-z-y1)) assay, DAPI/PI dual staining, and cell scratch assay. The biochemical fluorescent staining assays showed that TMZ@TA@ZIF-8 NPs potentially improved ROS, reduced MMP, and triggered apoptosis in U251 cells. In U251 cells treated with NPs, the p53, Bax, Cyt-C, caspase-3, −8, and −9 expressions were significantly enhanced, while Bcl-2 expression was diminished. These outcomes show the potential of TMZ@TA@ZIF-8 NPs as a therapeutic agent with anti-glioma properties. Overall, the pH-responsive drug delivery systems we fabricated using TMZ@TA@ZIF-8 NPs show great potential for cancer treatment. This approach has the potential to make significant contributions to the improvement of cancer therapy by overcoming the problems associated with TMZ-based treatments.
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高影响因子
危险品化学品经营许可证（带存储）