CHEMOSPHERE
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2024
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IF 8.1
Jun Guo,Jun Hou,Zijun Yang,Jun Xia,Jun Wu,Guoxiang You,Lingzhan Miao
NH 2 -MIL-125(Ti) materials had great potential for photocatalytic applications but had low activity due to exciton effect and narrow absorption range of visible light. The surface oxygen-containing negative functional groups of boron nitride quantum dots (BNQDs) could overcome these defects, but due to the low load capacity, a higher specific surface area of the substrate was usually required. In this paper, a hollow Ti-MOF material was developed by etching technology. The hollow structure formed by tannic acid etching broadened the absorption range of visable light and provided more alternative surfaces for loading BNQDs. The 85.2% of high tetracycline (TC) removal efficiency for the best sample (BNQDs-5@20-Ti-MOF + PMS) was obtained, which was about 56.8 and 1.9 times of the 20-Ti-MOF and BNQDs-5@20-Ti-MOF, respectively. BNQDs-5@20-Ti-MOF + PMS system showed a great TC degradation efficiency in a wide pH range (pH = 5–9). In addition, reaction temperature and the inorganic ions did not show significant inhibition effect for TC removal. Both free radical and non-free radical pathways were involved in the TC degration by BNQDs-5@20-Ti-MOF + PMS system, among which O 2 •− and 1 O 2 played the key roles. Interestingly, multiple 1 O 2 production paths contributed to the high efficiency and stability of BNQDs-5@20-Ti-MOF + PMS system. This study revealed a reasonable combination of Ti-MOF and BNQDs, which provided a new efficient photocatalyst for environmental remediation.
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MICROCHIMICA ACTA
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2024
·Vol. 191
·期 8
·1-11
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IF 5.3
Du Juan,Li Zongshuang,Liu Kai,Guo Jiangli,Bai Yanhong
A novel colorimetric aptasensor assay based on the excellent magnetic responsiveness and oxidase-like activity of Fe 3 O 4 @MIL-100(Fe) was developed. Fe 3 O 4 @MIL-100(Fe) absorbed with aptamer and blocked by BSA served as capture probe for selective isolation and enrichment of Listeria monocytogenes one of the most common and dangerous foodborne pathogenic bacteria. The aptamer absorbed on Fe 3 O 4 @MIL-100(Fe) was further used as signal probe that specifically binds with target bacteria conjugation of capture probe for colorimetric detection of Listeria monocytogenes , taking advantages of its oxidase-like activity. The linear range of the detection of Listeria monocytogenes was from 10 2 to 10 7 CFU mL −1 , with the limit of detection as low as 14 CFU mL −1 . The approach also showed good feasibility for detection of Listeria monocytogenes in milk and meat samples. The spiked recoveries were in the range 81–114% with relative standard deviations ranging from 1.28 to 5.19%. Thus, this work provides an efficient, convenient, and practical tool for selective isolation and colorimetric detection of Listeria monocytogenes in food. Graphical Abstract
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Zhiwang Yang,Xueqing Xu,Xixi Liang,Cheng Lei,Yuhan Cui,Wenhua Wu,Yaoxia Yang,Zhe Zhang,Ziqiang Lei
Photocatalytic synthesis using visible light is a desirable chemical process because of its potential to utilize sunlight. A heterostructured MIL-125/Ag/g-C 3 N 4 nanocomposite was implemented as an efficient bifunctional visible-light response catalyst for the photoreduction of nitrocompounds and the oxidation of alcohols. The photocatalyst was prepared via an accessible method and characterized by XRD, SEM, TEM, XPS, FT-IR, N 2 adsorption–desorption isotherm, UV–vis DRS, PL and EIS. The reactive efficiency of the photocatalyst depends on two primary factors, one is the light adsorption of catalysts, Ag nanoparticles (NPs) were photodeposited on the surface of g-C 3 N 4 and MIL-125 to increase visible-light absorption via the surface plasmon resonance. And the other is the separation efficiency of the photogenerated charge carrier. As an electron-conduction bridge in the interface between MIL-125 and g-C 3 N 4 , Ag NPs could facilitate the direct migration of photoinduced electrons from g-C 3 N 4 to MIL-125 and retard the recombination of electron-holes. Therefore, the MIL-125/Ag/g-C 3 N 4 sample shows highest photocatalytic activity compared with MIL-125, g-C 3 N 4 , MIL-125/Ag and MIL-125/g-C 3 N 4 . A corresponding photocatalytic mechanism of these reactions was discussed in detail. Moreover, the photoreduction of nitrocompounds and oxidation of the alcohols with superior conversions and selectivities were obtained, and the catalyst can be recycled four times. It is concluded that MIL-125/Ag/g-C 3 N 4 would be a promising visible light photocatalyst in the field of selective organic transformations.
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ACS Applied Materials & Interfaces
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2016
·
IF 7.145
Yu-Da Zhu,Su-Ping Chen,Huan Zhao,You Yang,Xiao-Qin Chen,Jing Sun,Hong-Song Fan,Xing-Dong Zhang
A medical nanoplatform with small size, low cost, biocompatibility, good biodegradability, and, in particular, multifunctionality has attracted much attention in the exploration of novel therapeutic methodologies. As an emerging material of self-assembled porous structure, metal–organic frameworks (MOFs) have high expectations because of their special properties compared to traditional porous materials. Therefore, integration of MOFs and functional materials is leading to the creation of new multifunctional composites/hybrids. Photothermal therapy (PTT), using near-IR (NIR) laser-absorbing nanomaterials as PTT agents, has shown encouraging therapeutic effects to photothermally ablate tumors. However, the most of widely used PTT agents are inorganic materials and nonbiodegradable. Herein, uniform polypyrrole (PPy) nanoparticles (NPs) with good biodegradability were synthesized by a microemulsion method. The PPy NPs were further coated with the mesoporous iron-based MOF structure MIL-100 by interaction between PPy NPs and MIL-100 precursors at room temperature. As a multifunctional nanoplatform, an anticancer drug could easily be loaded into the mesopores of the MIL-100 shell. The PPy core, as an organic photothermal agent, is able to photothermally ablate cancer cells and improve the efficacy of chemotherapy under NIR irradiation. The composites showed an outstanding in vivo synergistic anticancer capacity. Our work could encourage further study in the construction of a synergetic system using MOFs and organic PTT agents.
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TALANTA
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2016
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IF 4.035
Chao Zhao,Zhongwei Jiang,Ruizhu Mu,Yuanfang Li
In this work, a novel sensor based on fluorescence enhancement of Fe-MIL-88- H 2 O 2 -o-phenylenediamine (OPD) system for the determination of dopamine (DA) was developed. Fe-MIL-88 with intrinsic peroxidase-like catalytic activity tended to oxidize the nonfluorescent OPD into the fluorescent 2,3-diaminophenazine (DAP) with the presence of H 2 O 2 . When DA was introduced, the autoxidation of DA to yield hydroxyl radical (·OH) was further enhanced by Fe 3+ site in Fe 3 -μ 3 -oxo clusters exiting in Fe-MIL-88 MOFs , meanwhile the generated Fe 2+ appeared to involve a Fenton type reaction in the presence of H 2 O 2 to cause a continuous production of ·OH radicals which greatly enhanced the conversion efficiency of the OPD to fluorescent DAP. Thus, the turn-on fluorescence method for the DA detection was established. The linear range was from 50 nm to 30 μM with detection limit 46 nm (3σ/s). Furthermore, the proposed method has been reliably applied to determine dopamine content in dopamine hydrochloride injection and human urine with satisfactory results, which suggests its great potential for assay DA in chemical and biological analytical applications.
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ANALYTICA CHIMICA ACTA
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2017
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IF 4.95
Bin bin Zhang,Yi Shi,Hui Chen,Qing xia Zhu,Feng Lu,Ying wei Li
By coupling surface-enhanced Raman spectroscopy (SERS) with thin-layer chromatography (TLC), a powerful method for detecting complex samples was successfully developed. However, in the TLC-SERS method, metal nanoparticles serving as the SERS-active substrate are likely to disturb the detection of target compounds, particularly in overlapping compounds after TLC development. In addition, the SERS detection of compounds that are invisible under both visible light and UV 254/365 after TLC development is still a significant challenge. In this study, we demonstrated a facile strategy to fabricate a TLC plate with metal-organic framework-modified gold nanoparticles as a separable SERS substrate, on which all separated components, including overlapping and invisible compounds, could be detected by a point-by-point SERS scan along the developing direction. Rhodamine 6G (R6G) was used as a probe to evaluate the performance of the substrate. The results indicated that the substrate provided good sensitivity and reproducibility, and optimal SERS signals could be collected in 5 s. Furthermore, this new substrate exhibited a long shelf life. Thus, our method has great potential for the sensitive and rapid detection of overlapping and invisible compounds in complex samples after TLC development.
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ACS Applied Materials & Interfaces
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2015
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IF 6.723
Ruowen Liang,Lijuan Shen,Fenfen Jing,Na Qin,Ling Wu
In this work, MIL-53(Fe)-reduced graphene oxide (M53-RGO) nanocomposites have been successfully fabricated by a facile and efficient electrostatic self-assembly strategy for improving the interfacial contact between RGO and the MIL-53(Fe). Compared with D-M53-RGO (direct synthesis of MIL-53(Fe)-reduced graphene oxide nanocomposites via one-pot solvothermal approach), M53-RGO nanocomposites exhibit improved photocatalytic activity compared with the D-M53-RGO under identical experimental conditions. After 80 min of visible light illumination (λ ≥ 420 nm), the reduction ratio of Cr(VI) is rapidly increased to 100%, which is also higher than that of reference sample (N-doped TiO2). More significantly, the M53-RGO nanocomposites are proven to perform as bifunctional photocatalysts with considerable activity in the mixed systems (Cr(VI)/dyes) under visible light, which made it a potential candidate for industrial wastewater treatment. Combining with photoelectrochemical analyses, it could be revealed that the introduction of RGO would minimize the recombination of photogenerated electron–hole pairs. Additionally, the effective interfacial contact between MIL-53(Fe) and RGO surface would further accelerate the transfer of photogenerated electrons, leading to the enhancement of photocatalytic activity of M53-RGO toward photocatalytic reactions. Finally, a possible photocatalytic reaction mechanism is also investigated in detail.
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Journal of Environmental Chemical Engineering
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2014
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IF 0
Tingting Shen,Jinming Luo,Siyu Zhang,Xubiao Luo
Hierarchically mesostructured MIL-101 metal–organic frameworks (MOFs) were synthesized using anhydrous sodium acetate or hydrofluoric acid as a mineralizing agent and cetyltrimethylammonium bromide (CTAB) as a structure-directing agent. These new materials were then used to adsorb and remove the anionic dye methyl orange (MO) and the cationic dye methylene blue (MB) from contaminated water. The adsorption performance was systematically investigated and discussed. Experimental results revealed that the amount of MB adsorbed on MIL-101 that was prepared using sodium acetate is about 3.2 times the amount adsorbed on MIL-101 prepared using hydrofluoric acid, but quantities of adsorbed MO by the two adsorbents were nearly the same. Adsorbents synthesized with higher CTAB content had a higher content of the meso- and macro-scale pores, which favored the MB adsorption but impeded the MO adsorption. Dye adsorption is partially governed by the electrostatic interaction between the dye and the adsorbent, because the mineralizing agent can vary the charge carried by framework in a dye solution. The MB and MO adsorption kinetics followed a pseudo-second-order model, and the equilibrium dye adsorption data provided a good Langmuir model.
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TALANTA
·
2014
·
IF 3.511
Ning Li,Quanfei Zhu,Yang Yang,Jianlin Huang,Xueping Dang,Huaixia Chen
Metal-organic frameworks (MOFs) have been paid widespread attention in the field of adsorption and separation materials due to its porosity, large specific surface area, unsaturated metal-ligand sites and structural diversity. In this study, the green powder MIL-101 was synthesized and used for the extraction of benzophenone , 2,4-dihydroxybenzophenone and 2-hydroxy-4-methoxy-benzophenone from toner samples for the first time. The synthesized MIL-101 was characterized by X-ray diffraction, scanning electron microscopy, thermogravimetry and nitrogen adsorption porosimetry. The MIL-101 was applied as the dispersive solid phase extraction (DSPE) adsorbent for the extraction and preconcentration of benzophenone, 2,4-dihydroxybenzophenone and 2-hydroxy-4-methoxy-benzophenone from toner samples. The extraction conditions were investigated. Under the optimized conditions, a DSPE-HPLC method for the determination of benzophenone, 2,4-dihydroxybenzophenone and 2-hydroxy-4-methoxy-benzophenone was developed. The method yielded a linear calibration curve in the concentration ranges from 4.0 to 3500 μg L −1 for the three analytes in toner samples with regression coefficients ( r 2 ) of 0.9992, 0.9999 and 0.9990, respectively. Limits of detection were 1.2, 1.2 and 0.9 μg L −1 , respectively. Both the intra-day and inter-day precisions (RSDs) were <10%.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 22
·5239-5247
·
IF 3.431
Xie Lijun,Liu Shuqin,Han Zhubing,Jiang Ruifen,Zhu Fang,Xu Weiqin,Su Chengyong,Ouyang Gangfeng
The fiber coating is the key part of the solid-phase microextraction (SPME) technique, and it determines the sensitivity, selectivity, and repeatability of the analytical method. In this work, amine (NH 2 )-functionalized material of Institute Lavoisier (MIL)-53(Al) nanoparticles were successfully synthesized, characterized, and applied as the SPME fiber coating for efficient sample pretreatment owing to their unique structures and excellent adsorption properties. Under optimized conditions, the NH 2 -MIL-53(Al)-coated fiber showed good precision, low limits of detection (LODs) [0.025–0.83 ng L -1 for synthetic musks (SMs) and 0.051–0.97 ng L -1 for organochlorine pesticides (OCPs)], and good linearity. Experimental results showed that the NH 2 -MIL-53(Al) SPME coating was solvent resistant and thermostable. In addition, the extraction efficiencies of the NH 2 -MIL-53(Al) coating for SMs and OCPs were higher than those of commercially available SPME fiber coatings such as polydimethylsiloxane, polydimethylsiloxane–divinylbenzene, and polyacrylate. The reasons may be that the analytes are adsorbed on NH 2 -MIL-53(Al) primarily through π – π interactions, electron donor–electron acceptor interactions, and hydrogen bonds between the analytes and organic linkers of the material. Direct immersion (DI) SPME–gas chromatography–mass spectrometry methods based on NH 2 -MIL-53(Al) were successfully applied for the analysis of tap and river water samples. The recoveries were 80.3–115% for SMs and 77.4–117% for OCPs. These results indicate that the NH 2 -MIL-53(Al) coating may be a promising alternative to SPME coatings for the enrichment of SMs and OCPs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Tian Tian,Xuefeng Hu,Yao Huang,Huixian Du,Chao Wang,Mina Yang
The widespread utilization of fossil fuels has resulted in a significant increase in CO 2 emissions, leading to a variety of environmental issues. The photocatalytic conversion of CO 2 into fuel presents an effective solution to both the energy crisis and environmental warming. Therefore, the selection of a suitable catalyst is paramount. However, traditional photocatalysts often encounter challenges such as rapid electron-hole recombination and limited exposure of active sites. To improve these limitations, this study introduces AFM-X, a heterojunction catalyst composed of Au/Fe 3 O 4 /MIL-101(Fe)-X, which facilitates the formation of open metal sites (OMS) that enhance the effective separation of photogenerated carriers. In AFM-X, OMS function as Lewis acid sites, thereby enhancing CO 2 adsorption. The presence of Au nanoparticles (NPs) introduces additional active sites for CO 2 reduction. The synergistic effect between OMS and Au NPs increases the catalyst’s active sites, while the heterojunction construction promotes electron transfer, thereby enhancing CO 2 photocatalytic reduction efficiency. The CO generation rate of AFM-2 reached 98.8 μmol g −1 h −1 , surpassing those of FM, MIL-101(Fe), Fe 3 O 4 , and Au NPs, by 4.1, 6.3, 6.2, and 3.2 times, respectively. Furthermore, AFM-2 maintains stable performance over a 40 h cycle test. In-situ DRIFTS spectroscopy reveals that CO 2 reduction occurs through two parallel pathways. This study offers new insights into the design of composite photocatalytic materials, highlighting the effectiveness of OMS Lewis acid sites in significantly enhancing the photocatalytic reduction of CO 2 .
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2024
·Vol. 149
·期 10
·4505-4516
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IF 3
Liu Huimin,Deng Lisha,Zhao Ziheng,Sun Xiaoyan,Zhou Ru,Shu Chi-Min,Jiang Juncheng
An iron-based metal–organic framework, MIL-53(Fe), was synthesized and added as a synergist to high-density polyethylene (HDPE), and its flame-retardant effect with aluminum diethyl hypophosphite (ADP) and aluminum hypophosphite (AHP) in HDPE was investigated to further improve the flame-retardant efficiency. FTIR results showed that the ADP, AHP, and MIL-53(Fe) were successfully incorporated into the HDPE. The LOI of HDPE-3 and HDPE-7 with 0.75 mass% MIL-53(Fe) was 48.9% and 34.8% higher than that of the pure sample. The combustion grades reached V-0 and V-1. HDPE/MIL-53(Fe)/ADP exhibited more superior flame-retardant properties than HDPE/MIL-53(Fe)/AHP. A synergistic effect between ADP and both AHP and MIL-53(Fe) changes the decomposition process of HDPE. In addition, the FGI value of the composites decreased after the addition of MIL-53(Fe). MIL-53(Fe) enhances the thermal stability of HDPE composites, and improves the quality of the char residue. Experimental results show that MIL-53(Fe) can be used as a flame retardant and is a novel material in polymer flame-retardant research. The new synthetic material shown here may contribute to environmental safety.
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