APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Chenrui Liu,Yun Liu,Zhi Dang,Shuai Zeng,Chengcheng Li
In this paper, a kind of novel core-shell structured heterogeneous photo-Fenton catalyst, boron-doped reduced graphene oxide wrapped Fe 3 O 4 (Fe 3 O 4 @B-rGO) composite, was successfully synthesized by heating the mixture of Borane-Tetrahydrofuran adduct and graphene oxide wrapped Fe 3 O 4 (Fe 3 O 4 @GO) under reflux conditions. The core-shell structure of the catalyst had been confirmed by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photo electron spectra (XPS), and electron energy loss spectrum (EELS). The experimental results for Bisphenol A (BPA) degradation demonstrated that the as-prepared catalyst exhibited much higher photo-Fenton catalytic activity than Fe 3 O 4 and reduced graphene oxide wrapped Fe 3 O 4 (Fe 3 O 4 @rGO). Additionally, Fe 3 O 4 @B-rGO with mass concentration of doped boron at 9.3% exhibited the optimum catalytic property, in which system the BPA degradation kinetic rate constant was almost 1.96 times and 1.82 times of that in the systems with Fe 3 O 4 and Fe 3 O 4 @rGO, respectively. Finally, the mechanism analyses verified that OH, O 2 − and h + were the main reaction species in this system, and photo-electron generated by boron doped reduce graphene oxide (B-rGO) can accelerate the redox between Fe(II) and Fe(III). The excellent photo-Fenton performance, stability and magnetic separation properties make it promising for the degradation of organic compounds in waste water under visible light.
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E-POLYMERS
·
2022
·Vol. 22
·期 1
·488-504
·
IF 3.074
Fangsheng Wu,Zihua Zhang,Wei Liu,Yuan Liu,Xiujuan Chen,Pingyong Liao,Qiaoying Han,Lun Song,Hong Chen,Wenbin Liu
In this study, a novel material of core–shell structured magnetic molecularly imprinted polymers (Fe 3 O 4 @SiO 2 @Au (FSA)-MIPs) was successfully prepared for the rapid and selective determination of 4-methylmethcathinone (mephedrone, 4-MMC). The adsorption capacity of FSA-MIPs is 34.7 mg·g −1 at 308 K, which is significantly higher than magnetic non-imprinted polymers profiting from the imprinting effect. The FSA-MIPs have a short equilibrium (20 min) and could be reused more than six times. Moreover, the selectivity coefficients of FSA-MIPs for 4-MMC, 3,4-dimethylmethcathinone, butylone, 4-ethylmethcathinone, acetylfentanyl, and methylene blue are 4.01, 5.65, 7.62, 12.30, and 20.87 respectively, further indicating the markedly enhanced binding selectivity of FSA-MIPs. As an adsorbent, the FSA-MIPs were successfully applied for effective extraction of 4-MMC in three human urine samples with the recovery rates ranging from 85.5–92.6%. The results confirmed that the FSA-MIPs have good prospects in the extraction and separation of synthetic cathinones, which is suitable for further application in the criminal sciences field.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Wei Li,Siyuan Cao,Xu Yin,Qi Zhang,Liankai Gu,Hongwei Zhu,Kajia Wei,Weiqing Han
Seeking efficient and facile methods for precise oxygen vacancy (Ov)-content regulation is challenging for practical application. Herein, we propose a confinement-based Ov optimization strategy, and construct Fe 3 O 4 with controllable Ov confined in S-doped mesoporous carbon (Fe 3 O 4 @SMC) catalyst to enhance nonradical oxidation of PMS. The confinement effect induced the O 2p orbitals p-band-center shift in Fe 3 O 4 @SMC, which promoted Ov formation, thus achieving 100 % BPA degradation within 9 min via an electron-transfer process (ETP) dominated nonradical pathway with a 125.8-fold higher k obs value than unconfinement catalyst. Ov content variation under confinement, triggered by tuning confined support defect level, steered nonradical transition from single-electron-activated singlet oxygen route to two-electron-transferred ETP pathway, which improved selectivity (> 95 % of electron-rich pollutants removal), adaptability and durability (10 h continuous-flow operation) of catalyst. This work paves the way for modulating Ov in iron-oxides via confinement engineering and offers new insights into the Ov-induced mechanism in confined environments.
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BIOSENSORS & BIOELECTRONICS
·
2026
·
IF 11.8
Lingsong Lu,Yingying Zhang,Bei Liu,Nuo zhou,Dao jun Yu,Ying Wang
Circular RNAs (circRNAs) represent an emerging family of noncoding transcripts defined by closed-loop architecture, which are now established as key participants in the etiology of tumorigenesis and malignant progression. While circRNAs show potential as therapeutic targets and biomarkers, the accurate detection of circRNAs remains challenging due to interference from homologous linear RNAs. In this study, an ultrasensitive method for detecting circ_0051240 based on the sulfhydrated toehold capture probe-initiator assembly-mediated hybridization chain reaction (HCR) and the CRISPR-Cas12a system was developed. The capture probe (with a toehold domain)-initiator strand duplex was ingeniously fabricated to identify the back-splice junction (BSJ) of circRNA. After magnetic enrichment and separation by the Fe 3 O 4 -Au@UIO-66-NH 2 nanocomposite, the initiator strand (H0) was delivered to trigger HCR. The HCR product dsDNA concatemers contained multiply repeated CRISPR-targetable DNA sites that were readily recognized by the CRISPR RNA (crRNA). This specific recognition and binding activated the CRISPR-Cas12a system's collateral endonuclease activity, leading to cleavage of the fluorophore-quencher (FQ) reporters and fluorescence emission at a characteristic wavelength. This design eliminated linear RNA-related interference and enhanced the detection of fluorescence intensity (FI). Under optimal conditions, the proposed HCR/CRISPR-Cas12a method exhibited a wide quantitative measurement range spanning from 45 pM up to 180 nM, achieving a notable limit of detection (LOD) of 0.03 pM. In this study, a novel circRNA sensing strategy capable of accurate and highly sensitive quantification of ovarian cancer-specific circRNA was reported. The proposed method exhibits acceptable performance when compared to present approaches.
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BIOINORGANIC CHEMISTRY AND APPLICATIONS
·
2022
·
IF 4.724
Yuqin Yang,Junjie Miao,Zhendong Yin,Weili Hao,Hongmei Shi,Ling Ma,Tiesheng Shi
Efficient extractions of trace antibiotic residues in the environment are a key factor for accurate quantification of the residues. A new nanoporous material, namely, magnetically covalent organic polymer (MCOP, Fe3O4@SiO2-NH2-COP) was synthesized in this work and was used for magnetic solid-phase extraction (MSPE). The combination of MSPE with high-performance liquid chromatography separation together with ultraviolet detection (HPLC-UV) was established as an effective method for the determination of four sulfonamide (SA) residues in surface water surrounding a cattle farm. The synthesized magnetic material was characterized by SEM, TEM, FT-IR, magnetic properties measurement system (MPMS), and nitrogen gas porosimetry. The material possessed many attractive features, such as a unique microporous structure, a larger specific surface area (137.93 m2·g−1) than bare Fe3O4 (24.84 m2·g−1), high saturation magnetization (50.5 emu·g−1), open adsorption sites, and high stability. The influencing parameters, including pH, the used amount of MCOPs, the type of eluent, adsorption solution, and desorption time, were optimized. Under the optimized conditions, the method conferred good linearity ranges (R2 ≥ 0.9990), low detection limits (S/N = 3, LOD, 0.10–0.25 μg·L−1), and satisfactory recoveries (79.7% to 92.2%). The enrichment factor (EF) for the four SAs was 34.13–38.86. The relative standard deviations of intraday (n = 5) and of interday (n = 3) were less than 4.8% and 8.9%, respectively. The equilibria between extraction and desorption for SAs could be reached within 150 s. The proposed method was sensitive and convenient for detecting SA residues in complex environmental matrices, and the successful application of the new MCOPs as an adsorbent was demonstrated.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Jianzheng Zhen,Shisong Nie,Jiahao Sun,Shiyuan Pan,Jinhui Wang,Jian Sun,Weiyang Lv,Yuyuan Yao
Developing highly efficient and stable catalysts for peroxymonosulfate (PMS) based advanced oxidation processes (AOPs) are crucial in the field of environmental remediation. In this work, a facile encapsulated-precursor pyrolysis strategy was reported to prepare a competent PMS-activation catalyst, in which uniformly distributed Fe 3 O 4 nanoparticles were firmly anchored on porous boron nitride (BN) nanosheets by N-doped carbon shell (NC layer). Taking advantage of strong metal-support interaction, the as-synthesized catalyst (BFA-500) could efficiently activate PMS to achieve 100% removal of 4-chlorophenol (4-CP) in 6 min, and the corresponding turnover frequency (TOF) value was 1–2 orders of magnitude higher than that of the benchmark homogeneous (Fe 2+ ) and nanoparticle (Fe 0 and Fe 3 O 4 ) catalysts. Moreover, the well protected encapsulated structure of BFA-500 ensured the remarkable stability that could effectively resist the interference of complex water environment, including initial pH value, various inorganic ions and actual water, and its catalytic activity remained almost unchanged in 5 use-regeneration cycles. More importantly, the generation of O 2 •- and 1 O 2 radicals for the 4-CP removal in BFA-500/PMS system was ascribed to Fe 3 O 4 boosted C–N sites containing pyridinic N, where electrons transferred from the embedded Fe 3 O 4 nanoparticles to C–N sites to secure the PMS dissociation into reactive radicals. Overall, this work provided a promising way to design desired PMS-activation catalyst toward wastewater purification.
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Analytical Methods
·
2023
·Vol. 15
·期 36
·4758-4766
·
IF 3.1
Qiang Wang,Yulin Nie,Zhibin Wu,Yuan Yang
We developed an approach of magnetic dispersive solid-phase extraction (MSPE) based on magnetic graphene nanocomposite rGO/Fe3O4 for the determination of trace Sb(III) and Sb(V) using inductively coupled plasma mass spectrometry (ICP-MS). Scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR) were used to characterize the sorbent. The adsorption behavior of Sb(III) and Sb(V) on rGO/Fe3O4 was investigated. The results showed that the adsorption capacity of Sb(V) was nearly zero at pH = 9, while Sb(III) could be well adsorbed on rGO/Fe3O4. The magnetic SPE parameters including pH, adsorbent dosage, eluent type, and volume were optimized. The detection limit of Sb(III) under ideal conditions was 6 ng L−1, and the relative standard deviation was 7.6% (c = 1 g L−1, n = 7). The technique was used to identify Sb(III) at trace levels in environmental water samples, and its validity was examined by recovery experiments and the examination of an approved reference material.
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Journal of Analytical Methods in Chemistry
·
2021
·
IF 2.193
Ling Yu,Guiquan Guo,Jun Zhao,Linnan Zhao,Aiqing Xia,Xu He,Cuijuan Xing,Lili Dong,Fang Wang
A fast method based on Fe3O4 magnetic nanoparticles (Fe3O4 MNPs) modified QuEChERS integrated to dispersive liquid-liquid microextraction (DLLME) coupled with gas chromatography-mass spectrometry was established for the determination of 8 organochlorine pesticides (OCPs) in green leafy vegetables. The factors involved in the purification by QuEChERS and concentration by DLLME were optimized. In the QuEChERS process, Fe3O4 MNPs were used as a new impurity adsorbent after the sample extraction procedure by acetonitrile, which achieved phase separation rapidly. Carbon black was used as an alternative to costly graphitized carbon black without affecting the recovery. In the process of DLLME, 1 mL of the extract obtained by QuEChERS was used as the dispersive solvent, 40 μL of chloroform was used as the extractive solvent, and 4 mL of water was added. Making them mix well, then the dispersed liquid-liquid microextraction concentration was subsequently carried out. The enrichment factors of 8 OCPs ranged from 22.8 to 36.6. The recoveries of the proposed method ranged from 78.6% to 107.7%, and the relative standard deviations were not more than 7.5%. The limits of detection and limits of quantification were 0.15–0.32 μg/kg and 0.45–0.96 μg/kg, respectively. The method has been successfully applied to the determination of OCPs in green leafy vegetable samples.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2020
·
IF 3.004
Xiangrong Wu,Beibei Qiu,Yanan Chen,Yuqiong Shi,Jinhua Zhu,Xiuhua Liu,Dongbao Zhao
In this work, α-glucosidase was immobilized on a type of nanoscaled magnetic materials Fe 3 O 4 @ZIF-67 to construct a biomicroreactor for rapid screening α-glucosidase inhibitors. The parameters that affected the immobilization efficiency were investigated. Under optimal conditions, the amount of α-glucosidase loaded was up to 79.07 μg·mg −1 . Then, the enzyme biomicroreactor was immobilized by an external magnetic field in a tube connecting HPLC and micro-injection pump at both ends to form a magnetic online screening system. The screening flow rate and eluent organic solvent ratio during the screening process were optimized. XinYang MaoJian crude tea extract was tested to verify this online screening method, and three inhibitors (catechin, epigallocatechin gallate and epicatechin gallate) were fished by this magnetic online screening system. Based on the classical p NPG method, the inhibitory activities on α-glucosidase were further verified and studied. Compared with the traditional ligand fishing methods, the screening method established in this work can integrate screening, elution and analysis. It can simply, efficiently and directly screen and identify potential α-glucosidase inhibitors from natural sources. This method was expected to provide an effective basis for accelerating the development of new hypoglycemic drugs.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Zhi-Chao Xiao,Yan Li,Cheng-Lu Liang,Yang Liu,Rui-Ying Bao,Ming-Bo Yang,Wei Yang
For lithium ion batteries (LIBs), a high cell capacity, which requires both a high capacity and a high loading mass of active materials, is crucial for practical application. However, how to fabricate efficient anodes with high cell capacity and high areal capacity remains a challenge. To solve this issue, we design a structure of porous building block composed of multi-functional carbon integrated rGO-Fe 3 O 4 @C composites. The carbon shell of Fe 3 O 4 @C derived from polydopamine (PDA) acts as an artificial solid electrolyte interface (SEI) film to avoid the excessive SEI formation, within which there are sufficient lithium ion diffusion pathways derived from the spaces between Fe 3 O 4 nanocrystals. The carbon derived from the in-situ polymerized polyacrylamide and rGO act as a glue to integrate the as-obtained Fe 3 O 4 @C composites to form the porous building blocks. Due to the compact stacking of building blocks, the composite electrode achieves a high active material loading mass of 5.94 mg (5.25 mg cm −2 ), while maintains a satisfying capacity (685 mAh g −1 after the 100th cycle at 0.5 A g −1 ) and good rate performance (440 mAh g −1 at 3 C). Therefore, a high cell capacity (4.02 mAh) and a high areal capacity (3.6 mAh cm −2 ) at 2.62 mA cm −2 in a single CR2032 coin cell are achieved.
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MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Zhiwen Xu,Xinkai Fan,Qiaoying Ma,Biao Tang,Zhiwei Lu,Junjun Zhang,Guangquan Mo,Jiaping Ye,Jianshan Ye
In this work, based on a Fe 3 O 4 /multiwalled carbon nanotube/laser scribed graphene composites functionalized with chitosan modified glassy carbon electrode (Fe 3 O 4 /MWCNTs/LSG/CS/GCE), a highly active, sensitive, facile and low-cost electrochemical sensor was fabricated to determine cadmium (Cd 2+ ) and lead (Pb 2+ ) simultaneously using square wave anodic stripping voltammetry (SWASV). This novel nanocomposite possessed a significantly large specific area, remarkably high conductivity and excellent absorption ability. By in situ plating bismuth film, this constructed sensor proved favorable electrochemical response with a wide linear range from 1 to 200 μg L −1 , and an ultralow detection limit of 0.1 and 0.07 μg L −1 for Cd 2+ and Pb 2+ (S/N = 3), respectively. Furthermore, excellent repeatability, reproducibility, stability, and reliable practical applicability were achieved in the constructed sensor. Finally, the prepared sensor is believed to provide promising applications in the electrochemical determination of heavy metal ions .
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2018
·Vol. 99
·期 6
·2818-2825
·
IF 2.379
Yangying Sun,Tian Fu,Shuxian Chen,Zhen Wu,Yuxing Guo,Daodong Pan,Ning Gan
Background A novel colorimetric immunosensor was developed for the simple, sensitive and selective detection of ractopamine (RAC) based on using β -cyclodextrin-modified Fe 3 O 4 particles (Fe 3 O 4 @ β -CD) as capture probes and complex platinum colloid nanoparticles (PtNPs-PV) composed of platinum colloid nanoparticles (PtNPs) and polymerase chelate PowerVision (PV) as signal probes. Results PtNPs-PV double catalyzed the chromogenic substrate 3,3′-diaminobenzidine (DAB), which induced changes in the color of DAB and chromogenic absorbance. Incubation temperature, pH and incubation time were systematically optimized and, under optimum conditions, the measured absorbance values showed a linear relationship with the RAC concentrations in the range 0.03–8.1 ng mL −1 . The detection limit was 0.01 ng mL −1 . The sensor exhibited high sensitivity and specificity, as demonstrated by testing structurally similar organic compounds such as salbutamol, clenbuterol and dopamine. The practicality of the developed colorimetric immunosensor was supported by the successful detection of RAC in pork samples with recovery ranging from 94.00% to 106.00%. Conclusion We designed a novel sandwich-type noncompetitive colorimetric immunoassay for the detection of trace levels of RAC in pork. The proposed method can also be used for the detection of toxins in food products via PtNPs-PV amplification. © 2018 Society of Chemical Industry
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