JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Bo Xue,Chuanruo Yang,Miao Chang,Dahuan Liu
The development of a green, efficient, and reusable photocatalyst is of great importance for pollution remediation. Herein, a series of core-shell ZIF-8@NH 2 -MIL-125 composites (ZM-X) were prepared by epitaxial growth method. The in-situ homogeneous encapsulation of NH 2 -MIL-125 by ZIF-8 was achieved through the structural modulation, and the formed core-shell architecture exhibited outstanding synergistic effect of adsorption and photocatalysis for eliminating tetracycline hydrochloride (TCH), which dramatically enhanced the photocatalytic reaction rate. The results show that the TCH adsorption capacity of optimized ZIF-8@NH 2 -MIL-125 (ZM-2) is 70.25 mg g –1 , which can be fitted well the pseudo-second-order and Langmuir isotherm modes. Under 100 min of visible light irradiation, the ZM-2 has the best synergistic removal rate on TCH (92.9%) compared with other samples, which is 6.5 times higher than of pristine NH 2 -MIL-125 (14.3%). The results of quenching experiments and ESR analysis clearly demonstrate that the superoxide radical ( · O 2 – ) dominates the TCH photodegradation reaction. In addition, ZM-2 can effectively remove TCH in different types of water systems (e.g., ultrapure water, tap water, lake water and actual pharmaceutical wastewater) through adsorption-photocatalytic synergy. Therefore, the novel core-shell material designed in this study has significant potential for environmental purification applications.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yingjian Ma,Yinmin Wang,Rui Zhao,Zhijie Wang,Shuang Li,Meng Yu,Sen Pang,Xinyu Guo,Yong Xu,Xuemin Wu
Using advanced functional materials and technologies to construct new, efficient, and controlled-release pesticide formulations can effectively improve the target utilization of pesticides and reduce their impact on non-target organisms and the surrounding environment. Herein, we present a strategy for preparing pH-responsive nanodrug delivery systems (Pro@MSN@ZIF-8) by loading a pesticide (prochloraz) into biocompatible mesoporous silica nanoparticles (MSNs) and using acid-unstable Metal–organic frameworks (ZIF-8) as blocking agents. The results showed that Pro@MSN@ZIF-8 was able to release Pro rapidly in acidic environments, with a cumulative release rate of 92.4% at pH= 4.5 after 72 h, which was much higher than that at pH= 7.4 (39.7%). Additionally, Pro@MSN@ZIF-8 had longer-lasting fungicidal activity than Pro-technical. Safety tests showed that Pro@MSN@ZIF-8 has a low impact on non-target organisms and the surrounding environment. The EC 50 of Pro@MSN@ZIF-8 nanoparticles for aquatic Daphnia magna was 4.128 mg/L, which was approximately 1.4 times that of Pro-technical (3.027 mg/L) at 96 h. Moreover, it was less harmful to the soil microbial community and human LO2 liver cells. Pro@MSN@ZIF-8 can provide small amounts of trace elements required by plants to promote crop growth without disturbing normal growth. Therefore, this study provides an effective strategy to improve the efficiency of pesticide use and reduce environmental hazards, which are required for cleaner, environmentally friendly, and more efficient agricultural production.
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ACS Omega
·
2023
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IF 4.1
Jia Gao,Wenhui Chu,Xuankai Ding,Lingzhi Ding,Qing Guo,Yongqian Fu
Nanosized zeolitic imidazolate framework particles (ZIF-8 nanoparticles [NPs]) have strong potential as effective carriers for both in vivo and in vitro protein drug delivery. Synthesis of ZIF-8 and stability of protein encapsulation within ZIF-8 are affected by several factors, notably the metal ion source and molar ratio. To systematically investigate these factors, we investigated such effects using BSA as a model test protein to synthesize BSA@ZIF-8 NPs at various metal-to-ligand (M:L) ratios. SEM, FTIR, XRD, and DLS were applied to characterize the morphology and structure of BSA@ZIF-8 NPs and their effects on protein loading capacity. Degradation kinetics and protein release behavior of BSA@ZIF-8 NPs were evaluated at pH 5.0 (to simulate the tumor environment) and pH 7.4 (to mimic the blood environment). Our objective was to define optimal combinations of the high protein loading rate and rapid release under varying pH conditions, and we found that (i) the yield of BSA@ZIF-8 NPs decreased as the M:L ratio increased, but the protein content increased. This highlights the need to strike a balance between cost-effectiveness and practicality when selecting ZIF-8 NPs with different molar ratios for protein-based drug formulation. (ii) BSA@ZIF-8 NPs exhibited cruciate flower-like shapes when synthesized using Zn(NO3)2 as the zinc precursor at M:L ratios of 1:16 or 1:20. In all other cases, the NPs displayed a regular rhombic dodecahedral structure. Notably, the release behavior of the NPs did not differ significantly between these morphologies. (iii) When Zn(OAc)2 was used as the zinc precursor, the synthesized ZIF-8 NPs exhibited a smaller size compared to the Zn(NO3)2-derived ZIF-8 NPs. (iv) The release rate and amount of BSA protein were higher at pH 5.0 compared to pH 7.4. (v) Among the different formulations, BSA@ZIF-8 with an M:L ratio of 1:16 at pH 5.0 was observed to have a shorter time to reach a plateau (0.5 h) and higher protein release, making it suitable for locally rapid administration in a tumor environment. BSA@ZIF-8 prepared from Zn(OAc)2 at an M:L ratio of 1:140 showed the slower release of BSA protein over a 24-h period, indicating its suitability for sustained release delivery. In conclusion, our findings provide a useful basis for the practical application of ZIF-8 NPs in protein-based drug delivery systems.
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高影响因子
TALANTA
·
2023
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IF 6.1
Meng Zhang,Jianhong Zhang,Xin Che,Jingjing Jiang,Qin Tu,Jinyi Wang
As one of the essential trace elements in life activities, copper ion (Cu 2+ ) plays a very important role in human health. However, copper-containing pesticides are usually used for sterilization and disinfestation in agriculture. Thus, the residues of copper-containing pesticides in agricultural samples increase the risk of excessive intake of Cu 2+ for human. The development of an effective method for detecting Cu 2+ is still an important task. Herein, a detecting system based on AuNCs@ZIF-8 modified paper and smartphone platform was developed for visual detection of Cu 2+ in agricultural samples. Herein, a detecting system based on AuNCs@ZIF-8 modified paper and smartphone platform was developed for visual detection of Cu 2+ in agricultural samples. In the detecting system, gold nanoclusters (AuNCs) were packaged by ZIF-8 to limit their molecular motion and enhance the fluorescence effectively. In the meanwhile, by ultrasound-assisted biomimetic mineralizing, AuNCs@ZIF-8 composites were uniformly synthesized in situ on the surface of the paper fibers to indicate Cu 2+ by fluorescence quenching . A portable visual monitoring system consisted of the prepared Cu 2+ paper sensor and a smartphone platform was then successfully built and applied to on site detecting Cu 2+ in agricultural samples. The limit of detection (LOD) was 4.57 μM and recovery rate varied from 96.50 % to 121.58 %. The developed detecting system for Cu 2+ has the advantages of easy preparation and operation, and is very suitable for the use in agricultural products and farmland.
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Scientific Reports
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2023
·Vol. 13
·期 1
·1-13
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IF 4.6
Chakari-Khiavi Forough,Mirzaie Arezoo,Khalilzadeh Balal,Yousefi Hadi,Abolhasan Rozita,Kamrani Amin,Pourakbari Ramin,Shahpasand Koorosh,Yousefi Mehdi,Rashidi Mohammad-Reza
Alzheimer’s disease (AD) is a progressive brain disorder characterized by the ongoing decline of brain functions. Studies have revealed the detrimental effects of hyperphosphorylated tau (p-tau) protein fibrils in AD pathogenesis, highlighting the importance of this factor in the early-stage detection of AD conditions. We designed an electrochemical immunosensor for quantitative detection of the cis conformation of the p-tau protein ( cis -p-tau) employing platinum nanoparticles (Pt NPs) supported on zeolitic imidazolate frameworks (ZIF) for modifying the glassy carbon electrode (GCE) surface. Under optimum conditions, the immunosensor selectively and sensitively detected cis-p-tau within the broad linear range of 1 fg mL −1 to 10 ng mL −1 and the low limit of detection (LOD) of 1 fg mL −1 with desired reproducibility and stability. Furthermore, the fabricated immunosensor's performance was examined for the cis-p-tau analysis in the serum of AD patients, indicating its accuracy and feasibility for real-sample analysis. Notably, this is the first application of Pt@ZIF-8 nanocomposite in fabricating a valid immunosensor for selective cis-p-tau detection, even in the presence of trans-p-tau. It is worth mentioning that the enzyme-linked immunosorbent assay (ELISA) reference technique is not able to evaluate pico- or femtomolar concentrations of cis-p-tau, making the fabricated immunosensor superior for early-stage measurement and screening of AD.
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Analytical Methods
·
2023
·Vol. 15
·期 44
·6015-6020
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IF 3.1
Shanshan Liu,Nian Wang,Li Li,Yi Liu
Diseases such as liver cancer, extrahepatic biliary obstruction and osteocarcinoma are closely associated with the abnormal level of alkaline phosphatase (ALP). Hence, it is essential to develop a convenient assay to detect ALP activity. Herein, a novel signal-on fluorescent biosensor on account of the fluorescence signal of the aggregation-induced emission (AIE) fluorochrome 2,2′,2′′,2′′′-((ethene-1,1,2,2-tetrayltetrakis(benzene-4,1-diyl))tetrakis(oxy))tetraacetic acid (EBTAC) encapsulated zeolitic imidazolate framework-8 (ZIF-8@EBTAC) was designed to monitor ALP. Due to the aggregation-induced emission of EBTAC, the synthetic ZIF-8@EBTAC shows robust fluorescence. Once pyrophosphate (ppi) was added, its complexation with Zn2+ in ZIF-8 triggered the collapse of the ZIF-8 framework, releasing encapsulated EBTAC molecules and restoring to free state, leading to the dramatical decrease in fluorescence. ALP could catalyze the hydrolysis of ppi to phosphate (pi), which is difficult to bind to Zn2+ and has little effect on the fluorescence of ZIF-8@EBTAC. Therefore, with the assistance of the substrate ppi, the ultimate fluorescence of ZIF-8@EBTAC was positively related with ALP activity. The constructed biosensor was able to monitor the ALP activity well from 0.01 to 100 U L−1, and a detection limit of 0.01 U L−1 was achieved. Based on the ability of EBTAC serving as a fluorescent probe with aggregation-induced luminescence properties, this proposed design can be applied to diverse targets and provide new ideas for the establishment of fluorescent biosensors.
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Materials Today Communications
·
2023
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IF 3.8
Wei Chen,Fucheng Yun,Shenyi Zheng,Chen Shi,Jian Han
In this study, a simple two-step preparation method was used to prepare a new type of composite fiber adsorbent, metal–organic framework/chitosan/hydroxyapatite (ZIF-8 @CS/HAP), for the efficient removal of Lead ions（Pb(Ⅱ)）from water. The composite fiber was first characterized, and its surface morphology , functional groups, crystallinity, and pore structure were investigated. Subsequently, its optimal use environment was studied, and results found that the adsorbent could achieve the best effect in Pb(Ⅱ) solution with a starting concentration of 200 mg/L at pH ≥ 6 and a temperature of around 298 K. The presence of coexisting ions (Co 2+ , Sr 2+ , Ni 2+ , Cd 2+ , and Cu 2+ ) had no significant effect on the selective removal of Pb(Ⅱ) by ZIF-8 @CS/HAP. The process of ZIF-8 @CS/HAP adsorbing Pb(II) corresponded to the Langmuir model and the pseudo-second-order kinetic model, according to isotherm and kinetic investigations. The adsorption data fitted with the Langmuir model at 298 K reached a fitting degree (R 2 ) of 0.996, and the largest adsorption capacity up to 1058.2 mg/g, which is better than that in most fiber adsorbents. The adsorption mechanism could be attributed to the complexation of hydroxyl and amino groups on the surface of the composite fiber with Pb(Ⅱ), the coprecipitation of phosphate groups with Pb(Ⅱ), ion exchange, and electrostatic adsorption. This study provides an efficient adsorbent for treating Pb(Ⅱ)-contaminated wastewater. Its preparation process is environmental-friendly and easy to use, and it has a high adsorption capacity. Therefore, it has a wide array of potential applications in the field of water treatment.
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Food Packaging and Shelf Life
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2023
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IF 8
Lihan Wang,Shasha Cheng,Kaiwen Qin,Xinyan Yang,Hao Wang,Chaoxin Man,Qianyu Zhao,Yujun Jiang
Packaging films containing antibacterial substances play a crucial role in controlling contamination caused by food-borne pathogens. Herein, apigenin (APG) was encapsulated in zeolitic imidazolate frameworks 8 (ZIF-8) to achieve a synergistic antibacterial effect and prolonged drug release, aiming to extend the shelf life of food products. Under acidic condition, the release rate of APG reached 73.70 % after 12 h. Subsequently, propolis-gelatin (PG) films were prepared for food packaging. The addition of APG@ZIF-8 enhanced the hydrophobicity of PG films, making them more suitable for food packaging. However, the composite film exhibited reduced damage resistance and flexibility. The composite films demonstrated 100 % inhibition against Staphylococcus aureus and Escherichia coli under appropriate amount of APG@ZIF-8. The composite film coating significantly reduced the bacteria count on apple surfaces by 99.95% during storage, while maintaining their appearance. This study provides an effective way to develop novel antibacterial composite films.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Feng Xiao,Yang Zhou,Hao Zhang,Yanhui Wu
Fluoride pollution will cause serious harm to the human ecological environment. The capacitive deionization method for fluoride removal has the advantages of low cost, low energy consumption, and convenient operation. Electrode material is crucial for desalination performance. In this study, a novel manganese doped hollow cubic carbon material (MHCC) was prepared by constructing ZIF-8 with hollow cubic morphology as a precursor and carbonizing it with manganese acetate as a manganese source. Then, the derived MHCC material was characterized and tested for capacitive fluoride removal. The adsorption capacity of MHCC10 (the mass ratio of carbon material to manganese acetate tetrahydrate was 10:1) reached 6.2 mg/g and 25.5 mg/g at the initial NaF concentration of 30 mg/L and 150 mg/L respectively. It could maintain 85.5% of the initial capacity after 10 adsorption–desorption cycles. The CDI defluoridation mechanism of MHCC was analyzed. The hollow porous structure inherited from etched ZIF-8 can promote the formation of electric double layers. An appropriate amount of manganese doping has a pseudocapacitive effect, which helps to increase adsorption capacity and improve cycling performance. This work provides a new approach for the design and preparation of novel capacitive fluoride removal electrode materials.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
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IF 8.742
Qiuchen Wang,Yan Dai,Xuehua Ruan,Wenji Zheng,Xiaoming Yan,Xiangcun Li,Gaohong He
Carbon nanotubes (CNTs) with 1D gas transport channel has great prospect in MMMs based CO 2 separation. However, the insufficient compatibility with polymer and inner diameter of CNTs limit further improvement of their CO 2 separation performances. In this work, the unique ZIF-8 hollow nanotubes (HNTs) were proposed to construct high-speed gas transmission channel in MMMs by a three-step method (electrospinning-calcination-hydrothermal), aiming at concurrently improving the gas permeability and selectivity. The hollow inner cavity provides long-range and low-resistance gas transmission channels to ensure high gas permeability. At the same time, the ZIF-8 crystals composing the tube wall can not only screen for gas molecules pair, but also strengthen the affinity between the filler and polymer matrix by its organic ligands, thus the gas selectivity can be raised. Compared with ZIF-8 nanoparticles and ZnO HNTs, ZIF-8 HNTs based MMMs present competitive CO 2 separation. When the loading of ZIF-8 HNTs is 5 wt%, the gas separation performance shows the best, in which the CO 2 permeability is 147 Barrer and the CO 2 /N 2 selectivity is 68, approaching to the 2008 Robeson upper limit and surpassing most reported CNTs/Pebax based membranes. Therefore, the proposed ZIF-8 HNTs are promising for MMMs based CO 2 separation.
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Analytical Methods
·
2021
·Vol. 13
·期 26
·2943-2950
·
IF 2.896
Xinyi Li,Bingzhi Li,Min Chen,Mengmeng Yan,Xiaolin Cao,Jungang Yin,Ziping Zhang
In this paper, magnetic zeolitic imidazolate framework-8 composites were synthesized by a simple in situ method and then used for the first time as an adsorbent in magnetic solid-phase extraction for extracting multiple strobilurin fungicides. The magnetic composites were characterized in detail. The results showed that Fe3O4 nanoparticles were attached on the surface of zeolitic imidazolate framework-8 with a uniform particle size of 150–200 nm and that the magnetic composites possessed a perfect molecular transfer rate towards strobilurin fungicides. The parameters of the magnetic solid-phase extraction process, including solution pH, adsorption time, solution volume, elution solvent, and elution volume, were investigated. Under the optimum conditions, the recoveries of all five fungicides fell within the range 80.8–109.0% with spiking levels of 10, 20 and 50 ng mL−1. A magnetic solid-phase extraction-high performance liquid chromatography-tandem mass spectrometry method based on the magnetic composites was established and confirmed to be simple, time-efficient and highly sensitive.
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Analytical Methods
·
2021
·Vol. 13
·期 20
·2338-2344
·
IF 2.896
Hexiang Li,Fawei Zhu,Jun Xiang,Fangbin Wang,Qi Liu,Xiaoqing Chen
We herein report a facile and scalable strategy for the fabrication of a metal–organic framework (MOF) based composite by in situ growing ZIF-8 on gold nanoparticle (AuNP) loaded magnetic carbon nanotubes (mCNTs). AuNPs were firstly loaded on PEI (polyethylenimine) modified mCNTs by electrostatic forces, and then AuNPs/mCNTs were encapsulated into the ZIF-8 frame through in situ self-assembling of zinc ions and 2-methylimidazole. The morphology, spectroscopy and structural properties of the AuNP/mCNT@ZIF-8 nanocomposites were systematically characterized. The conductivity–strain tests revealed that the in situ insertion of AuNPs/mCNTs in ZIF-8 could not only shorten the electron transfer distance between active sites and mCNTs, but also increase the dispersion of mCNTs, which would benefit the electron and mass transfer. Besides, by adopting the AuNP/mCNT@ZIF-8 nanocomposite-modified glassy carbon electrode (GCE) as the working electrode, a novel electrochemical sensor was successfully developed for the detection of bisphenol A (BPA). A linear range of BPA detection from 1 μM to 100 μM with a limit of detection of 690 nM was favorably obtained. Moreover, the developed sensor exhibited satisfactory reproducibility and superior stability with excellent anti-interference ability, and was successfully applied in the detection of BPA in real samples.
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