FOOD CHEMISTRY
·
2022
·
IF 9.231
Rui Cheng,Xuejin Mao,Jiaying Yu,Fan Liu,Lan Guo,Dongmei Luo,Yiqun Wan
In view of the molecular structure of Aristolochic acid I (AA-I) and Aristolochic acid II (AA-II), MIL-101(Fe) was selected as the sorbent to develop a dispersive solid-phase extraction (d-SPE) method for capturing the two analytes from Houttuynia cordata. The interactions between the sorbent and analytes were investigated by FT-IR, XPS and UV–Vis DRS spectra. The optimized method demonstrated good linearity with R 2 > 0.9999. The limit of detections (LODs) were 0.007 mg/L and 0.014 mg/L for AA-I and AA-II, respectively, lower than the limit stipulated by Chinese Pharmacopoeia (0.001 %, w/w). The recoveries for AA-I and AA-II were within the range of 73.3–106.4 %. The precisions of intra-day and inter-day were 0.9–5.8 % and 2.1–5.8 %, respectively. Thus, the established method demonstrated to be efficient and reliable to determine AA-I and AA-II in Houttuynia cordata.
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Analytical Methods
·
2022
·Vol. 14
·期 8
·798-805
·
IF 3.532
Hongmei Liu,Shihao Dang,Mingdeng Li,Baogui Ye
Increasing the adsorption sites and effective interactions between sorbents and the targets can improve the solid-phase extraction (SPE) efficiency. Herein, based on the advantages of MOFs and TiO2 nanotubes (TiO2 NTs), an MIL-101(Fe)@TiO2 NT composite was prepared and applied to extract non-steroidal anti-inflammatory drugs (NSAIDs) from water samples coupled with high performance liquid chromatography (HPLC). Through characterization, it was established that MIL-101(Fe) was effectively composited on the surface and inside the TiO2 nanotubes, increasing effective adsorption sites. The obtained composite material well retains the structure and functional groups of the two original materials, and while retaining the original force with the target, it achieves a synergistic effect and produces more interactions with the target. Therefore, the extraction efficiency was greatly improved. The recovery efficiency reached 97.7–105.1% with an RSD of less than 6.71%, the detection limit was 0.1–0.2 μg L−1, and the linear range was 1–200 μg L−1 with a determination coefficient of 0.9972–0.9994. Owing to the stability of the two original materials, the composite material could be recycled and reused to extract NSAIDs up to 15 times without a loss of the recovery rate. Satisfactory results were obtained when it was used to extract NSAIDs from the Yellow River. These results indicate that the synthesized MIL-101(Fe)@TiO2 NT material is a promising sorbent to extract NSAIDs at trace concentrations with high efficiency and long lifetimes.
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ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Lin Li,Hongyu Zhang,Mengdan Zhang,Ting Wang,Xiaohong Hou
MIL-88B(Fe)/cellulose microspheres (MIL-88B(Fe)/CMs) were characterized by the means of SEM, XRD, TGA and N 2 adsorption-desorption test. The composite was used as the sorbent for fully automated dispersive pipette extraction (DPX), after introducing CMs as the support, the loss of MIL-88B(Fe) in DPX was avoided. Coupled to UPLC-MS/MS, the proposed method was employed for the analysis of trace sulfonamides (SAs) in milk samples. The parameters affecting the extraction efficiency, including pH of sample solution, the rate of aspiration and dispense, amount of the adsorbent, type and volume of elution solvent were optimized. Under the optimal conditions, good linearity (r ≥ 0.9978 for five analytes), high sensitivity (limit of detection: 0.00660–0.0136 μg kg −1 ) and satisfactory recovery (69.8%–100.9%) were achieved. Furthermore, the sorbent showed desirable reusability over eight extraction cycles. Compared with other methods for the pretreatment of SAs, the proposed method showed advantages of high sensitivity, less sorbent consumption, environmental friendliness and automation, providing a promising protocol for sample preparation.
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Reaction Chemistry & Engineering
·
2021
·Vol. 7
·期 1
·84-100
·
IF 4.239
Jungang Yi,Xianghui Wu,Huadong Wu,Jia Guo,Kun Wu,Linfeng Zhang
With the aim of solving the increasingly serious problem of environmental pollution and the energy crisis, in this work a novel NH2-MIL-53(Fe)/AgSCN (NMFA) composite photocatalyst was successfully prepared through a one-step chemical precipitation method. The prepared composites demonstrate an excellent photocatalytic performance for ciprofloxacin (CIP) and rhodamine B (RhB) degradation under visible-light irradiation. Within 60 min, the degradation rate for CIP and RhB reached 90% and 100%, respectively, which was 1.84/3.33 times and 1.79/2.04 times greater than that of the single NH2-MIL-53(Fe) and AgSCN samples. Furthermore, the H2 production rate of the NMFA-5 composite was 4742 μmol g−1 h−1, which was 5.25 and 17.37 times greater than that of the pure samples. Owing to the combination of NH2-MIL-53(Fe) and AgSCN, the separation and transmission efficiency of the photon-generated carriers in the composites was improved, which was demonstrated using optical characterization and a series of electrochemical characterization techniques. In addition, a possible mechanism for the excellent photocatalytic performance of the NMFA composites is discussed. The work in this paper may provide a technical reference for the application of silver modified metal organic frameworks (MOFs)-based composite photocatalysts for the treatment of environmental remediation.
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BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Xiaolin Zhong,Min Zhang,Lu'an Guo,Yongze Xie,Renfeng Luo,Wenxue Chen,Faliang Cheng,Lishi Wang
Designing a photoelectrochemical (PEC) immunosensor that can produce dual photocurrent signals which can refer to each other is a great importance but a big challenge. In this manuscript, a novel dual photocurrent signals immunosensor was constructed for the detection of α-fetoprotein (AFP). Unlike the usual method of using two composite materials to provide cathode and anode photocurrent respectively, this work applies only one compound of MIL-101 (Cr) and CdSe quantum dots (QDs). Thereinto, we found that the photocurrent polarity of MIL-101(Cr) would switch by adjusting applied voltage . And then CdSe QDs was introduced by simple ultrasound mixing to boost the dual photocurrent signals. Furthermore, in the composite of M&C, the electron transfer path between MIL-101(Cr) and CdSe QDs may switch between “Z-type” and “Ⅱ-type” by adjusting voltage. Benefiting by the dual signals, the proposed sensor can not only perform sensitively quantitative detection of α-fetoprotein (AFP), but also can intuitively estimate the accuracy and reliability of the test result by determining whether the corresponding relationship of “cathode photocurrent-analyte concentration-anode photocurrent” is established. The linear ranges of the sensing electrodes as cathode and anode are the same, both from 0.1 to 300 ng mL −1 . The limit of detection (LOD) is 0.082 ng mL −1 (S/N = 3) when it used as an anode, and the LOD is 0.054 ng mL −1 (S/N = 3) when it served as cathode. Furthermore, this sensor showed acceptable stability, reproducibility, specificity, and feasibility of detecting AFP in human serum, which has broad development prospects in the early clinical diagnosis.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 11
·1-8
·
IF 5.479
Jiang Yanxiao,Ma Pinyi,Piao Huilan,Qin Zucheng,Tao Shuo,Sun Ying,Wang Xinghua,Song Daqian
Cellulose paper was coated with the metal-organic framework MIL-101(Cr) in a chitosan matrix and utilized for thin-film microextraction (TFME). The coated paper possesses excellent extraction efficiency for the triazine herbicides atraton, desmetryn, secbumeton, prometon, ametryn, dipropetryn, and dimethametryn. High-performance liquid chromatography-tandem mass spectrometry was applied to quantify target analytes. The effects of mass ratio of MIL-101(Cr) to chitosan, sample pH value, time of adsorption and desorption, and type and volume of desorption solvent on extraction efficiency were optimized. Under the optimal conditions, the method has limits of detection between 1.5 and 22 ng·L −1 . The recoveries of triazines from spiked tap water, drinking water, lake water and river water range from 77.0 to 125.3%, with relative standard deviations of <17.4%.
Cellulose paper was modified with metal-organic framework MIL-101(Cr)/chitosan by using a simple, efficient and environmentally friendly approach. The modified cellulose paper was then used as a novel extraction phase in thin-film microextraction (TFME).
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Petroleum Science
·
2023
·
IF 5.6
Bo-Long Jiang,Dong-Xu Zhang,Dan-Dan Yuan,Yan-Guang Chen,Tian-Zhen Hao,Hua Song
Oxidative desulfurization from fuel oil is one of the important methods for deep desulfurization. The development of efficient oxidative desulfurization catalysts is crucial for improving the desulfurization performance. Successful encapsulation of phosphotungstic acid (HPW) and ionic liquid (BMImBr) inside the mesoporous cages of MIL-101(Cr) was accomplished through a combination of “bottle around ship” and “ship in bottle” methods. The obtained BMImPW@MIL-101(Cr) composite was characterized by XRD, FTIR, BET, SEM, XPS and ICP methods. Results indicated that the BMImPW@MIL-101(Cr) composites with PW 3− loading of 23.1–50.7 wt% were obtained, demonstrating that the “bottle around ship” method is beneficial to make full use of nanocages of MIL-101(Cr) to obtain expected high loading of active PW 3 − . The BMImPW@MIL-101(Cr) exhibits excellent reusability with no evidence of leaching of active PW 3 − and BMIm + , and well-preserved structure after successive cycles of regeneration and reuse. The significantly improved stability of BMImPW@MIL-101(Cr) as compared to HPW@MIL-101(Cr) is possibly because the leaching of the active PW 3 − − sites can be greatly suppressed by forming large size of BMImPW owing to introduction of BMIm + cation. The BMImPW@MIL-101(Cr) exhibited excellent catalytic activity for solvent free oxidative desulfurization of refractory sulfides. The enhanced oxidative desulfurization activity as compared to HPW@MIL-101(Cr) can be explained by the intimate contact of sulfides with active PW 3 − sites owing the strong attraction of BMIm + cation with the sulfides.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Boyuan Tu,Kaifu Yu,Dengjiang Fu,Li Zhou,Ruixiang Wang,Xinying Jiang,Huanhuan Liu,Xin Cao,Xiang Gong,Rong He,Yongjian Tang,Tao Chen,Wenkun Zhu
Photo-assist uranium extraction from fluorine-containing uranium wastewater by building semiconductor-plasma material heterostructure is a forward-looking strategy, which not only effectively accelerates F-U separation via the LSPR effect but also impacts the intensity of binding between U (VI) and site. Here, we developed an amino-rich Ag-NWs/NH 2 -MIL-125(Ti) (AgNW/N-M(Ti)) hybrid nanowires with LSPR effect for photo-assist uranium extraction. Accordingly, the AgNW/N-M(Ti) hybrid nanowires presented 90.4% removal efficiency for U(VI) without a sacrificial agent at the U: F molar ratio of 1:20. By virtue of In-situ KPFM, we identify hot electrons generated over AgNW were transferred to amino-rich N-M(Ti) to efficiently reduce the U(VI) adsorbed on the N-M(Ti), which effectively enhances the excellent uranium removal performance of AgNW/N-M(Ti) hybrid nanowires. This strategy may open a paradigm for the development of advanced heterojunctions with the LSPR effect as catalysts for photo-assisted uranium extraction from fluorine-containing uranium wastewater.
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ANALYTICAL SCIENCES
·
2023
·Vol. 39
·期 6
·925-933
·
IF 1.6
Tang Tingfan,Li Xiaohui,Zhu Jiaqing,Huang Wenyi,Cheng Hao,Feng Jun
In this paper, a polymer monolithic column based on poly (Butyl methacrylate-co-ethylene glycol dimethacrylate) (poly (BMA-co-EDGMA)) doped with MIL-53(Al) metal–organic framework (MOF) was prepared using an in situ polymerization method. The characteristics of MIL-53(Al)-polymer monolithic column were studied through scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FT-IR), energy-dispersive spectroscopy (EDS), X-ray powder diffractometry (XRD), and nitrogen adsorption experiment. Due to its large surface area, the prepared MIL-53(Al)-polymer monolithic column has good permeability and high extraction efficiency. Using MIL-53(Al)-polymer monolithic column for solid-phase microextraction (SPME), coupled to pressurized capillary electrochromatography (pCEC), a method for the determination of trace chlorogenic acid and ferulic acid in sugarcane was established. Under optimized conditions, chlorogenic acid and ferulic acid have a good linear relationship ( r ≥ 0.9965) within the concentration range of 50.0–500 µg/mL, the detection limit is 0.017 µg/mL, and the relative standard deviation (RSD) is less than 3.2%. The spike recoveries of chlorogenic acid and ferulic acid were 96.5% and 96.7%, respectively. The results indicate that the method is sensitive, practical, and convenient. It has been successfully applied to the separation and detection of trace organic phenolic compounds in sugarcane samples. Graphical abstract
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LANGMUIR
·
2018
·
IF 3.789
S. Y. Chong,T. T. Wang,L. C. Cheng,H. Y. Lv,M. Ji
A novel heterogeneous catalyst, the ionic liquid (IL) of 1-butyl-3-methylimidazolium acetate (BmimOAc) immobilized on MIL-101-NH2, denoted as IL(OAc–)-MIL-101-NH2, was prepared by the “ship-in-a-bottle” strategy. The IL of BmimOAc was prepared in the MIL-101-NH2 nanocages primordially, in which the condensation product of MIL-101-NH2’s amine group with 1,1′-carbonyldiimidazole (CDI) reacted with 1-bromo butane, and then the intermediate exchanged with potassium acetate. The structure and physicochemical properties of IL(OAc–)-MIL-101-NH2 were characterized by powder X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, DRS UV–vis, nitrogen adsorption–desorption, and elemental analysis. The results indicated that BmimOAc was anchored in the MIL-101-NH2 skeleton via the acylamino group and confined in the nanocages in the form of a single molecule. The composite material of IL(OAc–)-MIL-101-NH2 exhibited excellent catalytic activity and catalytically synthesized 3-aryl-2-oxazolone in an excellent yield of 92%. It can be reused up to six times without noteworthy loss of its activity and demonstrated distinct size-selective property for substrates. It was conjectured that the diffusion kinetics of reactants could be controlled by the aperture size of the metal–organic framework support.
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TALANTA
·
2018
·
IF 4.244
Qian Luan,Xin Xiong,Ning Gan,Yuting Cao,Tianhua Li,Dazhen Wu,Youren Dong,Futao Hu
An ultrasensitive colorimetric aptasensor was developed for antibiotics detection, with chloramphenicol (CAP) as model target, using DNAzyme labeled Fe-MIL-88-Pt as novel peroxidase mimic signal tags and target-triggered circular strand-displacement polymerization (CSDP) for signal amplification. The system consists of two components which can partially hybridize with each other: one is capture probe which was formed through immobilizing hairpin DNA containing aptamer sequence on magnetic beads (MB-cDNA), another is signal tag which was constructed through labeling single strand DNAzyme (G-quadruplex/Hemin) which can partially hybrid with cDNA on platinum nanoparticles functionalized Fe-MIL-88 (MIL-88-Pt-DNAzyme). All components of MIL-88, Pt and DNAzyme in the tag can act as peroxidase mimic to triply catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by H 2 O 2 into a blue-colored oxidized TMB (oxTMB) for the colorimetric readout. Thus distinctive signal can be observed by naked eye even in presence of 0.02 nM tags. In the presence of target and primer, cDNA loop can open to form cDNA/CAP intermediates, enabling primer to hybridize with the exposed sequences of the cDNA, which initiated target assisted CSDP recycles. Then numerous signal tags were released into supernatant to catalyze TMB for color development. There was a liner relationship between the absorbance and the concentration of CAP in the range of 0.1 pM (0.0323 pg/mL) to 1000 pM (323 pg/mL) with the detection limit of 0.03 pM (0.0097 pg/mL). The ultra-high sensitivity was ascribed to the multiplex catalytic activities from the tags and CSDP based signal amplification. Furthermore, this method can produce signals being observed by naked eye to facilitate in-situ detection and be further extended to detect other antibiotics in food just by simply replacing cDNA on the sensing system.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Ruowen Liang,Fenfen Jing,Guiyang Yan,Ling Wu
Visible-light-initiated organic transformations have received much attention because of low cost, relative safety, and environmental friendliness. In this work, a series of CdS-decorated MIL-68(Fe) nanocomposites (CdS-M68 NCs) have been prepared via a facile room-temperature photodeposition technique in a controlled manner. Importantly, the CdS-M68 NCs exhibit remarkably enhanced photoactivity toward selective reduction of 4-nitroaniline (4-NA) to p -phenylenediamine (PPD) in water under visible light irradiation (λ ≥ 420 nm) as compared to bare CdS and MIL-68(Fe), giving a 4-NA conversion of ∼100% after irradiation for 8 min. The significantly enhanced photoactivity is attributed to the integrated factors of the effective transportation of the photogenerated electron-hole pairs and the enhanced visible light absorption intensity. Combining with trapping experiments and ESR analysis, it could be revealed that the photoexcited electrons and CO 2− radicals should be the main active species in the present system. In addition, a possible photocatalytic reduction mechanism has been investigated.
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