CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2022
·Vol. 38
·期 4
·941-948
·
IF 2.726
Shen Congcong,Chen Yuehua,Feng Beidou,Chi Hongying,Zhang Hua
An ultrasensitive electrochemical biosensor was fabricated for electroanalytical determination of ascorbic acid(AA), dopamine(DA) and uric acid(UA) individually and simultaneously based on polypyrrole hollow nanotubes loaded with Au and Fe 3 O 4 nanoparticles(NPs) uniformly(PPy@Au-Fe 3 O 4 ). The PPy@Au-Fe 3 O 4 nanotubes were synthesized in one-pot using MoO 3 nanorods as templates and the polymerization of Py, the formation of Au and Fe 3 O 4 NPs and the removel of MoO 3 templates took place stimultaneously. Electrochemical studies reveal that PPy@Au-Fe 3 O 4 modified glassy carbon electrode(GCE) possesses excellent electrocatalytic activities toward the oxidation of AA, DA and UA. Their oxidation peak currents increase linearly in the concentration ranges of 1–2000 µmol/L for AA, 0.01–25 and 25–300 µmol/L for DA and 0.1–300 µmol/L for UA. Their detection limit values( S/N =3) were calculated as 0.45, 0.0049, and 0.051 µmol/L for AA, DA and UA in the individual detection. By changing the concentrations simultaneously, the calibration curves showed linearity to 1000, 200, and 200 µmol/L with detection limit of 0.39, 0.0060, and 0.060 µmol/L for AA, DA, and UA, respectively. Finally, the obtained biosensor was successfully applied to the detection of AA, DA, and UA with satisfactory results on actual samples.
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MICROCHEMICAL JOURNAL
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2022
·
IF 5.304
Lanlan Li,Qirui Huang,Jing Xiao,Jiamin Feng,Shu Zhang,Hong Luo,Zhirong Zou,Xiaoli Xiong
Fe 3 O 4 was served as an adsorbent and photocatalyst simultaneously in this work, Bi(III) was preconcentrated by Fe 3 O 4 before its photochemical vapor generation-atomic fluorescence spectrometry (PVG-AFS) determination. The experimental conditions including the concentration of formic and acetic acid mixed solution, ultraviolet (UV) irradiation time, the concentration of Fe 3 O 4 and the interferences from the common co-existing ions were explored. The AFS intensity was enhanced slightly by the mixed acid solution (30% (v/v) acetic acid + 5% (v/v) formic acid), while a significant enhancement was observed by using Fe 3 O 4 as photocatalyst with the presence of mixed acid solution, 13-fold enhancement was obtained. The potential enhanced mechanism of Fe 3 O 4 was also discussed here. Fe 3 O 4 was decomposed in the mixed acid solution, Fe 3+ was generated and further served as a sensitizer for improving Bi(III) efficiency. Under the optimized conditions, the limit of detection (LOD) of the proposed PVG-AFS system without or with preconcentration (sample of 5 mL) were 0.44 ng/mL and 0.07 ng/mL, respectively. This PVG-AFS system was successfully applied to the determination of four water samples and their spiked samples, with good recoveries ranging from 94% to 104%, demonstrating a good accuracy and applicability.
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Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Linfa Bao,Jingjing Han,Huifang Wang,Renrong Liu,Muqing Qiu,Baowei Hu
In this study, a novel synergistic photocatalyst (Fe 3 O 4 /GO/g-C 3 N 4 composites) were constructed by chemical precipitation of Fe 3 O 4 nanoparticles on surface of GO/g-C 3 N 4 suspension. The characterization results indicated that Fe 3 O 4 /GO/g-C 3 N 4 composites exhibited high efficient separation of photogenerated electron–hole pair, narrow bandgap (∼2.38 eV) and wide absorption range. The incorporation of Fe 3 O 4 significantly increased the photocatalytic performance of GO/g-C 3 N 4 composites due to synergistic effect. More than 90% of U(VI) was photo-reduced by Fe 3 O 4 /GO/g-C 3 N 4 composites within 2 h under visible light irradiation. The trapping experiments and XPS analysis indicated that the photogenerated electrons and superoxide ( ⋅ O 2 ) radicals are responsible for U(VI) removal. These findings indicated that magnetic g-C 3 N 4 composites can be used as excellent candidates for the high efficient removal of U(VI) in actual environmental cleanup.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Zhoumei Xu,Fukai Chu,Xiaoyu Luo,Xin Jiang,Liang Cheng,Lei Song,Yanbei Hou,Weizhao Hu
In order to separate heavy-metal ions from contaminated wastewater and further realize the reutilization of waste adsorbent, magnetic composites with flowerlike structure were successfully synthesized. After the absorption of Cu2+ ions, hybrids can be used as effective coatings to enhance the fire safety of flexible polyurethane foam (FPUF) through a dip-coating method. As-fabricated metal–organic framework (MOF)-based composites exhibited a core–shell and flowerlike structure with high thermal stability. The maximum adsorption capacity for Cu2+ could reach 292.13 mg·g–1, calculated from the Langmuir isotherm model. In order to reutilize the adsorbed Cu2+ ions, the CuO-loaded MOF-derived Fe3O4@ZnO@CuO (MO) was obtained with a simple heat treatment. The effectivity of MO as a fire-safety coating for inhibiting the release of heat and toxic gases of FPUF was satisfactory. The application of this MOF-based composite will provide useful insights into the design of bifunctional materials for efficient wastewater remediation and fire-safety coatings.
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ANALYST
·
2022
·Vol. 147
·期 9
·1815-1823
·
IF 5.227
Yue Wang,Cheng Cheng,Ruofei Ma,Zhangrun Xu,Yukihiro Ozaki
Visualization of signaling molecules in single living cells is crucial for understanding cellular metabolism and physiology, which can provide valuable insights into early diagnoses and treatments of diseases. Highly sensitive in situ monitoring of intracellular analytes released from single living cells by virtue of label-free nanosensors is urgently needed, which can avoid interferences from molecular labeling. Here, we proposed an ultrasensitive strategy for in situ imaging of intracellular H2O2 in single living cancer cells by surface-enhanced Raman scattering (SERS) spectroscopy with the utilization of label-free Fe3O4@Ag core–satellite nanoparticles (NPs). The Fe3O4@Ag NPs can efficiently and selectively catalyze the oxidation of the peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H2O2. Additionally, they exhibit excellent SERS activity that allows for in situ monitoring of intracellular H2O2 in living cells through establishing the correlation between the H2O2 level and the SERS intensity of the catalytic oxidation product of TMB. The H2O2 concentration is revealed through the SERS intensity of oxidized TMB with a good linear response in a wide range from 1 fM to 1 mM. Moreover, the intracellular H2O2 level in live cancer cells and imaging of the distribution of H2O2 inside single cells can be achieved by using such a label-free nanosensor based strategy. Our work demonstrates that the label-free Fe3O4@Ag NP-based SERS imaging and quantification strategy is a promising and powerful approach to assess intracellular H2O2 in living cells and allows us to monitor single-cell signaling molecules with nanoscale resolution.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaobing Yang,Junjie Pan,Jiapeng Hu,Shengyun Zhao,Kejun Cheng
During the planting, storage, or feeding stages, foodstuffs can be easily polluted by mycotoxins such as aflatoxin B 1 , patulin and zearalenone, which are produced by pathogenic microorganisms. Therefore, the removal of these mycotoxins constitutes an active area of research. Herein, we used an Fe/Zn metal–organic framework (MOF) as a precursor to fabricate a novel La–ZnFe 2 O 4 @Fe 3 O 4 @carbon magnetic hybrid composite via a simple absorption–pyrolysis method and explored its photocatalytic performance in the degradation of aflatoxin B 1 , patulin, and zearalenone. La–ZnFe 2 O 4 @Fe 3 O 4 @carbon can effectively degrade 98.37% of aflatoxin B 1 , outperforming Fe 3 O 4 @carbon (69.57%) and ZnFe 2 O 4 @Fe 3 O 4 @carbon (91.39%). Moreover, La–ZnFe 2 O 4 @Fe 3 O 4 @carbon exhibits superior stability and excellent photocatalytic activity for the degradation of patulin (97.35%) and zearalenone (98.52%). Transient photocurrent response measurements reveal that the La doping and the combination with ZnFe 2 O 4 highly promote the separation of photoinduced electron–hole pairs on Fe 3 O 4 @carbon. An electron spin resonance analysis suggests that · OH and · O 2 − are the main active radicals during the photodegradation process. Thus, a plausible photodegradation pathway for the degradation of mycotoxins produced by pathogenic microorganisms is proposed.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zelin Shan,Fang Ma,Minghan Xu,Xiaoqing Shan,Lianbin Shan,Chongwei Cui,Haijuan Guo
Improving the yield of reactive oxygen species and inhibiting the recombination of photogenerated e - and h + have been reliable strategies to accelerate the rate-limiting step for nano photocatalytic materials. A novel magnetic Fe 3 O 4 @La-BiFeO 3 composite with variable molar ratios was successfully synthesized via a facile hydrothermal method for the photo-Fenton-like degradation of norfloxacin (NOR) under visible light irradiation. The comprehensive characterization of the crystal phase purity, morphological structure and elemental composition of the catalyst confirmed the formation of a heterojunction structure between Fe 3 O 4 and La-BiFeO 3 . The effects of the composite molar ratio, initial pH, catalyst addition, and H 2 O 2 concentration on the degradation efficiency were investigated. 20% Fe 3 O 4 @La-BiFeO 3 showed the best catalytic activity with 93.8% removal of NOR after 60 min of reaction and the pseudo-first-order rate constant was 0.05952 min −1 , attributed to the synergistic interaction of the photocatalytic and Fenton-like processes. The excellent stability and recyclability of the catalyst ensured the catalytic reactions continued to occur efficiently. The appropriate amount of Fe 3 O 4 reduced the band gap of the catalyst, and the introduction of a weak magnetic field accelerated the transfer of electrons between interfaces, effectively restrained the recombination of photogenerated e - /h + and directly enhanced the yield of ·OH and O 2 · - . This work not only realized the preparation of a heterogeneous photo-Fenton-like catalyst with high application potential for the degradation of antibiotics, but also provided new prospects for designing efficient catalysts on the basis of theoretical guidance.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Hongpeng Wang,You Zhou,Hongna Xing,Xianfeng Yang,Yan Zong,Juan Feng,Xiuhong Zhu,Zhenhua Shi,Xinghua Li,Xinliang Zheng
Optimizing impedance matching and boosting interfacial polarization by constructing hierarchical magnetic/dielectric heterostructures is a promising strategy to acquire high-performance microwave absorption. Herein, 3D flower-like core-shell Fe 3 O 4 @2H-MoS 2 architectures were constructed, in which magnetic Fe 3 O 4 submicrospheres are uniformly coated by 2H-MoS 2 nanosheets . Compared to bare Fe 3 O 4 and 2H-MoS 2 , the hierarchical Fe 3 O 4 @2H-MoS 2 heterostructures show boosting microwave absorption, which is related to the content of Fe 3 O 4 submicrospheres. When the thickness is only 1.9 mm, the Fe 3 O 4 @2H-MoS 2 heterostructures display an optimal reflection loss (RL) of −50 dB at 13.2 GHz and effective absorption bandwidth (EAB, RL ≤ −10 dB) of 4.2 GHz (11.4–15.6 GHz). Besides, an EAB can be achieved in 14.6–18.0 GHz with an ultrathin thickness of 1.5 mm. The superior microwave absorption of Fe 3 O 4 @2H-MoS 2 heterostructures is mainly originated from two aspects. First, the combination of magnetic Fe 3 O 4 and semi-conducting 2H-MoS 2 can induce better impedance matching in comparison with the bare Fe 3 O 4 and 2H-MoS 2 . Second, the embedded Fe 3 O 4 core can greatly boost the complex permittivity and dielectric loss of 2H-MoS 2 , leading to improved microwave attenuation capacity. The boosting dielectric loss is primarily due to the unique interfacial polarization, induced by the special core-shell hierarchical architectures. This work suggests that optimizing impedance matching and boosting interfacial polarization are effective strategies to improve the microwave absorption of 2H-MoS 2 , which can be realized by loading magnetic nanostructures and designing 3D hierarchical heterostructures.
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Nanomaterials
·
2021
·Vol. 11
·期 11
·3038
·
IF 5.076
Tao Shi,Zhiheng Zheng,Huan Liu,Dezhen Wu,Xiaodong Wang
Electromagnetic (EM) and infrared (IR) stealth play an important role in the development of military technology and the defense industry. This study focused on developing a new type of multifunctional composite film based on polyimide (PI)/graphene/Fe3O4hybrid aerogel and polyethylene glycol (PEG) as a phase change material (PCM) for EM and IR bi-stealth applications. The composite films were successfully fabricated by constructing a series of PI-based hybrid aerogels containing different contents of graphene nanosheets and Fe3O4nanoparticles through prepolymerizaton, film casting, freeze-drying, and thermal imidization, followed by loading molten PEG through vacuum impregnation. The construction of PI/graphene/Fe3O4hybrid aerogel films provides a robust, flexible, and microwave-absorption-functionalized support material for PEG. The resultant multifunctional composite films not only exhibit high microwave absorption effectiveness across a broad frequency range, but also show a good ability to implement thermal management and temperature regulation under a high latent-heat capacity of over 158 J/g. Most of all, the multifunctional composite films present a wideband absorption capability at 7.0–16.5 GHz and a minimum reflection loss of −38.5 dB. This results in excellent EM and IR bi-stealth performance through the effective wideband microwave absorption of graphene/Fe3O4component and the thermal buffer of PEG. This study offers a new strategy for the design and development of high-performance and lightweight EM–IR bi-stealth materials to meet the requirement of stealth and camouflage applications in military equipment and defense engineering.Keywords:electromagnetic and infrared bi-stealth;phase change material;polyimide-based aerogels;graphene/Fe3O4hybrid;thermal regulation;microwave absorption
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高影响因子
FOOD CHEMISTRY
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2021
·
IF 7.514
Qingyi Wei,Peiyao Zhang,Hongbin Pu,Da-Wen Sun
Trace amounts of 17 β -estradiol (E2) in food and the environment poses a threat to human health, which has created the demand for sensitive analytical methods to detect E2. In this study, a novel fluorescent aptasensor was developed for sensitive detection of E2 based on double-chain hybridization between carbon quantum dots-labelled with E2 aptamer (CQDs-aptamer) and Fe 3 O 4 nanoparticles modified by complementary DNA (Fe 3 O 4 -cDNA). Under the optimal conditions, the aptasensor displayed a good linear range of 10 -11 –10 -6 M for E2 with the coefficient of determination (R 2 ) of 0.996, and a low detection limit of 3.48 × 10 -12 M was obtained. Besides, the aptasensor showed high selectivity and good reproducibility for E2 detection, which was successfully applied to the sensitive detection of E2 in milk as compared with tap water and lake water with satisfactory recoveries from 85.21% to 114.80%, suggesting the great significance of this aptasensor for detecting food contaminants in the food industry.
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Frontiers in Chemistry
·
2021
·
IF 5.221
Fang Danruo,Jin Hansong,Huang Xiulin,Shi Yongxin,Liu Zeyu,Ben Suqin
Non-small cell lung cancer (NSCLC) is considered to be a principal cause of cancer death across the world, and nanomedicine has provided promising alternatives for the treatment of NSCLC in recent years. Photothermal therapy (PTT) and chemodynamic therapy (CDT) have represented novel therapeutic modalities for cancer treatment with excellent performance. The purpose of this research was to evaluate the effects of PPy@Fe3O4 nanoparticles (NPs) on inhibiting growth and metastasis of NSCLC by combination of PTT and CDT. In this study, we synthesized PPy@Fe3O4 NPs through a very facile electrostatic absorption method. And we detected reactive oxygen species production, cell apoptosis, migration and protein expression in different groups of A549 cells and established xenograft models to evaluate the effects of PPy@Fe3O4 NPs for inhibiting the growth of NSCLC. The results showed that the PPy@Fe3O4 NPs had negligible cytotoxicity and could efficiently inhibit the cell growth and metastasis of NSCLC in vitro. In addition, the PPy@Fe3O4 NPs decreased tumor volume and growth in vivo and endowed their excellent MRI capability of observing the location and size of tumor. To sum up, our study displayed that the PPy@Fe3O4 NPs had significant synergistic effects of PTT and CDT, and had good biocompatibility and safety in vivo and in vitro. The PPy@Fe3O4 NPs may be an effective drug platform for the treatment of NSCLC.
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高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Zhihui Chen,Jun Yao,Bo Ma,Bang Liu,Jonghyok Kim,Hao Li,Xiaozhe Zhu,Chenchen Zhao,Meseret Amde
The presence of chlorophenols in water and wastewater is considered a serious environmental issue . To eliminate these micropollutants, biodegradation of chlorophenols using enzyme-nanoparticle conjugated biocatalyst, is proposed as an economical and eco-friendly method. Herein, amino-functionalized superparamagnetic Fe 3 O 4 @SiO 2 –NH 2 nanoparticles with core-shell structure were constructed as a promising carrier for immobilization of laccase from Trametes versicolor . Compared with free laccase, Fe 3 O 4 @SiO 2 –NH 2 -Laccase displayed remarkable outcomes in all major areas such as temperature and storage stabilities, and tolerance to organic solvents and metal ions . The biocatalytic performance and reusability of Fe 3 O 4 @SiO 2 –NH 2 -Laccase were evaluated for the degradation of 2,4-dichlorophenol (2,4-DCP) and 2,4,6-trichlorophenol (2,4,6-TCP) in repeated cycles. Even after 10 successive reuses, the degradation rate of 2,4-DCP and 2,4,6-TCP were found to be 54.9% and 68.7%, respectively. The influences of solution pH, initial chlorophenol concentration, and temperature on the degradation rate of these two chlorophenols were evaluated. The degradation intermediate products including dimers, trimers , and tetramers of 2,4-DCP and 2,4,6-TCP were identified. Release of chloride ions was observed during the enzymatic degradation of these two chlorophenols. Based on the determination of intermediate products and released chloride ions, the degradation pathway that was involved in dehydrogenation , reactive radical intermediates formation, dechlorination , self-coupling and oligomers/polymers formation was proposed. The toxicity of these two chlorophenols and their intermediates was substantially reduced during the enzymatic degradation. The results of this study might present an alternative clean biotechnology for the remediation of 2,4-DCP and 2,4,6-TCP contaminated water matrices.
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