JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Lin Wang,Qiya Sun,Yicheng Dou,Zhipeng Zhang,Tingting Yan,Yongmei Li
A novel ternary recyclable Fe 3 O 4 /graphene/sulfur-doped g-C 3 N 4 (Fe 3 O 4 /GE/SCN) composite catalyst was synthesized and adopted in a visible-light driven catalytic system for the degradation of ranitidine, which is an important precursor of the emerging disinfection by-product of N-nitrosodimethylamine (NDMA). The addition of GE and Fe 3 O 4 significantly improved the interface charge transfer of SCN, increased the light collection efficiency and decreased the photogenerated charge recombination efficiency. Considering both the ranitidine removal efficiency and catalyst recovery, the Fe 3 O 4 mass fraction of 20% (20%-Fe 3 O 4 /GE/SCN) was recommended. Ranitidine (≤ 2 mg/L) was completely removed in 60 min under the conditions of an initial pH of 7.0 and a 20%-Fe 3 O 4 /GE/SCN dose of 1.0 g/L, and its degradation fitted well with the pseudo first-order kinetics model. Electron paramagnetic resonance analysis and trapping experiments confirmed that ·O 2 − , ·OH and h + participated in the degradation of ranitidine. Ranitidine was removed through the pathways of demethylation and hydroxylation based on the analysis of the detected degradation intermediates, and 57.3% of the NDMA formation potential (FP) was reduced after the reaction. The visible-light driven 20%-Fe 3 O 4 /GE/SCN catalytic technology is a promising method not only for the control of NDMA FP but also the catalyst could be recovered and reused.
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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 2
·1-10
·
IF 5.479
Wu Wenqin,Jia Mingming,Wang Zhongzheng,Zhang Wen,Zhang Qi,Liu Guozhen,Zhang Zhaowei,Li Peiwu
A method is described for the simultaneous voltammetric determination of the heavy metal ions cadmium(II), lead(II), mercury(II), zinc(II), and copper(II) using a glassy carbon electrode (GCE) modified with magnetite (Fe 3 O 4 ) nanoparticles and fluorinated multiwalled carbon nanotubes (Fe 3 O 4 /F-MWCNTs). The Fe 3 O 4 /F-MWCNT composite was synthesized by a hydrothermal method and characterized by X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, scanning electron microscopy, elemental mapping, electrochemical impedance spectroscopy, and square wave stripping voltammetry. Under the optimum conditions, the electrode displays excellent response to the ions. Figures of merit for Cd(II), Pb(II), Hg(II), Zn(II), and Cu(II), respectively, include (a) high electrochemical sensitivity (29.88, 43.50, 120.86, 47.34 and 90.31 (μA μM −1 cm −2 ), (b) well separated peaks (at −0.70, −0.53, +0.37, −1.11 and + 0.01 V vs. Ag/AgCl); (c) low limits of detection (0.014, 0.0084, 0.0039, 0.012, and 0.0053 μM); and (d) wide linear ranges (0.048–30.0, 0.028–30.0, 0.013–32.5, 0.039–32.5, and 0.017–31.5 μM). The modified GCE displays satisfying selectivity in the presence of potentially interfering other metal ions, stability for 30 days, and reproducibility of electrodes (with a relative standard deviation between 1.2 and 4.8% for n = 6). The modified GCE was applied to the determination of several heavy metal ions in (spiked) water and rice samples, and the results agreed well with data obtained by atomic fluorescence spectrometry or inductively coupled plasma-mass spectrometry. The dramatic performance probably result from the semi-ionic C-F bond on F-MWCNTs surface with a strong negative charge, the good electrical conductivity of the F-MWCNTs and Fe 3 O 4 , the synergistic interaction between Fe 3 O 4 and F-MWCNTs, and the nafion conductive membrane improving the stability of the modified layer and enhanced cation adsorption.
An environmentally-friendly, low-cost, high-throughput Fe 3 O 4 /fluorinated multi-walled carbon nanotube composite (Fe 3 O 4 /F-MWCNTs) modified glassy carbon electrode is described. It was applied to simultaneous electrochemical determination of Cd(II), Pb(II), Hg(II), Zn(II), and Cu(II) by square wave stripping voltammetry
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2015
·
IF 2.729
Miaomiao Tian,Yongcun Zou,Shaoyan Zhou,Tianpeng Wang,Xueju Lv,Qiong Jia
Novel magnetic adsorbents based on Fe 3 O 4 /SiO 2 /poly(acrylamide- N , N' -methylene bisacrylamide) magnetic microspheres modified with non-ionic triblock copolymer surfactant were successfully prepared as a magnetic solid phase extraction adsorbent for the determination of trace natamycin in jam samples. The adsorbent was characterized by scanning electron microscopy, transmission electron microscopy, Fourier transformed infrared spectroscopy, vibrating sample magnetometer, and X-ray diffractometer analysis, confirming that Pluronic L64 was effectively functionalized on the magnetic materials. Various experimental parameters affecting the extraction capacity were investigated including adsorbent amount, extraction time, desorption time, sample pH, and ionic strength. For recovery evaluations, the jam samples were spiked at two concentration levels of 100 and 200 μg kg −1 of natamycin and the recovery values were in the range of 78.8–93.4%. The relative standard deviations (RSD) for the recoveries were less than 3.5%. The novel magnetic solid phase extraction method provided several advantages, such as simplicity, low environmental impact, convenient extraction procedure, and short analysis time when used for natamycin analysis.
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高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Liping Jiang,Xuyang Zhou,Guyun Wei,Xiaoduo Lu,Weiping Wei,Jianhua Qiu
Polymer brushes based on poly(glycidyl methacrylate) (PGMA) have been successfully grafted from the surface of silica coated iron oxide (Fe 3 O 4 @SiO 2 ) nanoparticles via surface-initiated activators generated by electron transfer atom transfer radical polymerization (SI-AGET ATRP). The size of the nanoparticles could be adjusted from 7.3 to 9.6 nm by varying the precursor concentration of iron(III) acetylacetonate. The Fe 3 O 4 nanoparticles possessed a highly crystalline structure, and the saturation magnetization of the as-prepared magnetite was strongly related to the particle size. Furthermore, the grafted PGMA content on the magnetic nanoparticles could be controlled by varying the ligand to transition metal ratio in a N , N , N ′, N ″, N ″-pentamethyldiethylenetriamine (PMDETA)/CuBr 2 catalyst system. The maximum grafted content was 23.1% at a ratio of [PMDETA] 0 /[CuBr 2 ] 0 = 2:1.
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Molecular Catalysis
·
2017
·
IF 0
Xueliang Cui,Yunfeng Zheng,Meng Tian,Zhengping Dong
In this study, magnetic SiO 2 @Fe 3 O 4 @m-MnO 2 microspheres with uniform morphology and mesoporous MnO 2 shell were successfully prepared. The MnO 2 sheets structured mesoporous shell could provide a large specific surface area, thereby increasing the catalytically active sites. Thus, magnetic SiO 2 @Fe 3 O 4 @m-MnO 2 microspheres were used as a catalyst support. Palladium nanoparticles (Pd NPs) were successfully anchored with high dispersion on SiO 2 @Fe 3 O 4 @m-MnO 2 surface, successfully obtained Pd(6%)/SiO 2 @Fe 3 O 4 @m-MnO 2 nanocatalyst with a Pd weight percentage of 6%. The obtained nanocatalyst was employed in the hydrodechlorination of highly toxic 2,4-dichlorophenol and catalytic reduction of the widely used nitroaromatics and organic dyes under ambient conditions. In these catalytic reactions, the Pd(6%)/SiO 2 @Fe 3 O 4 @m-MnO 2 nanocatalyst with large and accessible pore surface area exhibited excellent catalytic activity as compared to other noble metal supported catalysts. The Pd(6%)/SiO 2 @Fe 3 O 4 @m-MnO 2 nanocatalyst could also be easily and conveniently recovered from the reaction mixture by using an external magnet, attributed to its magnetism, thus preventing the catalyst loss. Moreover, it could also be reused for at least six times without significant decrease in the catalytic activity, indicating its excellent reusability and stability. This study provides a useful platform and a new perspective for fabricating mesoporous MnO 2 microspheres based noble metals modified catalysts for environmental catalysis.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Jiaxin Lu,Yizhan Qiu,Luxi Zhang,Jiancheng Wang,Chunmei Li,Pan Wang,Lianhai Ren
Biodegradable plastic bags (BPBs), meant for eco-friendly, often inadequately degrade in compost, leading to microplastic pollution. In this study, the effect of Fenton-like reaction with Fe 3 O 4 nanoparticles (NMs) on the plastisphere microorganisms' evolution and the BPBs' aging mechanism was revealed by co-composting of food waste with BPBs for 40 days. The establishment of the Fenton-like reaction was confirmed, with the addition of Fenton-like reagent treatments resulting in an increase of 57.67% and 37.75% in H 2 O 2 levels during the composting, compared to the control group. Moreover, the structural characterization reveals that increasing oxygen content continuously generates reactive free radicals on the surface, leading to the formation of oxidative cavities. This process results in random chain-breaking, significantly reducing molecular weights by 39.27% and 38.81%, thus showcasing a deep-seated transformation in the plastic's molecular structure. Furthermore, the microbial network suggested that the Fenton-like reaction enriched plastisphere keystone species , thus accelerating the BPBs' aging. Additionally, the Fenton-like reaction improved compost maturity and reduced greenhouse gas emissions . These results reveal the bio-chemical mechanisms of BPBs aging and random chain-breaking by the Fenton-like reaction, under alternating oxidative/anoxic conditions of composting and provide a new insight to resolve the BPBs' pollutions.
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高影响因子
POLYMER
·
2024
·
IF 4.1
Xiang Dong,Zhiyu Sun,De-long Li,Qiancheng Duan,Yan Ma,Song Liu
As epoxy resin (EP) is widely used in the microelectronic field, it is essential to improve its electromagnetic wave (EMW) absorption and flame retardancy simultaneously. In this work, we synthesized a novel nanohybrid, RMN (Fe 3 O 4 /NHS@M(OH)(OCH 3 )@rGO (M = Co, Ni)), with petal-shaped anisotropic interfaces, by using graphene oxide as the core and the 2D nanosheets M(OH)(OCH 3 ) (M = Co, Ni) as the petal, with nickel hydroxystannate and ferrite as further modifications. The RMN combines carbon-based materials, ferrites and conductors, and represents the petal-like structure with rich nondirectional interfaces. The results show that EP composite containing 25 wt% RMN represented excellent EMW absorption, with a minimum reflection loss of −55.79 dB (with 7.4 mm thickness at 3.1 GHz). Moreover, the EP composite with 15 wt% RMN (EP/RMN700-3) had the lowest peak heat release rate of 470.9 kW m −2 , which was 69.7 % lower than pure EP, showing a significantly improving in flame retardant. The thermal conductivity efficiency of EP/RMN700-3 increased to 128.4 % compared with the pure EP, which effectively reduces fire risk caused by heat accumulation. This study provides a valuable solution to overcome the challenges of EMW absorption and flame retardant for EP in the microelectronic materials field.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 9
·1-9
·
IF 5.705
Gou Dan,Xie Guoming,Li Yuxia,Zhang Xin,Chen Hui
The authors describe an electrochemical immunoassay for ultrasensitive determination of the Mycobacterium tuberculosis (MTb) secretory protein MPT64 which is an antigen for early diagnosis of infection with MTb . Protein G was used to immobilize antibodies against MPT64 on a gold electrode. Graphene oxide with its large surface area was used as a carrier to anchor magnetite (Fe 3 O 4 ) and platinum (Pt) nanoparticles. The nanocomposite of type GO@Fe 3 O 4 @Pt was used as a signal reporter with excellent catalytic activity and recyclability. The nanocomposite exhibits peroxidase-like activity for hydrogen peroxide, best at −0.25 V (vs. Ag/AgCl). It works over a wide range of pH values (2–10) and temperatures (25–65 °C). Further signal amplification strategy was accomplished by rolling circle amplification. This voltammetric assay has a linear response to the logarithm of MPT64 concentration in the range from 5.0 fg·mL −1 to 1.0 ng·mL −1 and a detection limit of 0.34 fg·mL −1 (at a signal to noise ratio of 3, for n = 10). The assay can be completed within 4 h. It was successfully applied to the determination of MPT64 in spiked serum samples. Conceivably, the assay has a large potential in providing laboratory evidence for rapid diagnosis of MTb infection.
An electrochemical biosensor was developed for rapid detection of Mycobacterium tuberculosis secretory protein MPT64. The detection signal was synergistically amplified by GO@Fe 3 O 4 @Pt and rolling circle amplification. Phi29: phi29 DNA polymerase; BSA: bovine serum albumin; GO: graphene oxide.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2012
·
IF 4.98
Xiaoyan Wang,Zuoming Zhou,Guohua Jing
Magnetic poly(styrene–glycidyl methacrylate) porous microspheres (MPPM) with high magnetic contents were prepared by surfactant reverse micelles and emulsion polymerization of monomers, in which the well-dispersed Fe 3 O 4 nanoparticles were modified by polyethylene glycol (PEG) and oleic acid (OA) respectively. The characterizations showed that both of the OA–MPPM and the PEG–MPPM were ferromagnetic, however, the OA–MPPM was used to immobilize the bacteria for more advantages. Therefore, the effects of monomer ratio, surfactant, crosslinker and amount of Fe 3 O 4 on the structure, morphology and magnetic contents of the OA–MPPM were investigated. Then, the OA–MPPM was utilized to immobilize Klebsiella sp. FD-3, an iron-reducing bacterium for Fe(III)EDTA reduction applied in NO x removal. Compared with free bacteria, the immobilized FD-3 showed a better tolerance to the unbeneficial pH and temperature conditions.
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Analytical Methods
·
2021
·Vol. 13
·期 25
·2804-2811
·
IF 2.896
Feng Qin,Shujuan Wang,Mingxia Gao,Xiangmin Zhang
The highly effective detection of pathogens in complex biological samples is an attractive and critical topic of study. Bacitracin is a novel broad-spectrum antimicrobial peptide to enrich bacteria via interactions with the membrane surface of the different bacterial cells. In this study, for the first time, bacitracin was immobilized on the surface of Fe3O4@PDA magnetic nanoparticles for the enrichment of Staphylococcus aureus (G+) and Klebsiella pneumoniae (G−). Combined with matrix-assisted laser desorption ionization time-of-flight mass spectrometry, a rapid and sensitive detection method for these two bacteria was developed. In this method, the detectable concentration of bacteria was decreased by 2–3 orders of magnitude in unenriched samples. The enrichment and identification can be completed in one hour. All these results demonstrated that the bacitracin-functionalized magnetic composite has potential for use in the large-scale enrichment and isolation of target pathogens from complex biological samples, opening a new avenue for the rapid and sensitive detection of pathogens.
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Journal of Water Process Engineering
·
2023
·
IF 7
Yi-Meng Sun,Chang Li,Yi-Hung Liu
1 Activating graphite electrodes to improve the selectivity of a 2-electron oxygen reduction reaction (ORR) and enhance heterogeneous Fenton catalyst loading is an effective method for restoring the water environment. Herein, the structures and properties of CO 2 -activated graphite felt (GF-CO 2 ), which achieves effective etching at high temperatures in CO 2 atmosphere, are evaluated. Oxygen-containing functional groups and defects are formed on the surface of GF-CO 2 , which improved the electrochemical behavior of GF, producing 2.86 times greater H 2 O 2 accumulation in an hour than GF-Raw. Using GFs as the anode in air-cathode fuel cells, GF@Fe 3 O 4 composites are fabricated in situ from acid mine drainage (AMD). The application of GF-CO 2 @Fe 3 O 4 as an electro-Fenton (E-Fenton) cathode exhibited efficient removal (98.8 %) and mineralizing (80.4 %) of chloroquine (CLQ) in 40 min and 240 min, respectively. Since it is favorable to enhance Fenton oxidation activities, the efficiency enhancement is attributed to the higher H 2 O 2 electrogeneration efficiency and metal content of the prepared GF-CO 2 @Fe 3 O 4 composite. The heterogeneous E-Fenton systems equipped with the GF-CO 2 @Fe 3 O 4 composite can be operated in a wide pH range and eliminate various organic pollutants . Thus, CO 2 activation of GF is a promising strategy to improve the efficiency of heterogeneous E-Fenton catalyst of GF@Fe 3 O 4 cathodes fabricated from AMD . This technology provides an environmentally friendly approach to restoring accessibility to fresh, clean water in an era where water scarcity threatens the water supply.
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高影响因子
MOLECULAR PHARMACEUTICS
·
2026
·
IF 4.9
Weiyang Lv,Zihan Wang,Chunxin Huang,Xing Li,Lianjie Bai,Xiaotong Wang,Huilin Liu,Yunna Song,Bowen Liu,Xiaomei Ning
Abstract This study aimed to investigate the therapeutic efficacy and underlying mechanisms of paclitaxel (PTX)-loaded magnetic iron oxide nanomicrobubbles (PTX@Fe3O4 NMBs) combined with ultrasound therapy in breast cancer xenograft models. The PTX@Fe3O4 NMBs were synthesised using a modified microfluidic approach and characterised for size, stability and drug loading. Female BALB/c nude mice bearing MCF-7 xenografts were randomly divided into five groups: control, free PTX (TPL), blank NMBs with ultrasound (TPL + US), targeted NMBs with ultrasound (TLUM + US) and combination therapy with ultrasound (FA-TLUM + US). Tumour growth was monitored for 21 days. Contrast-enhanced ultrasound imaging was performed to evaluate tumour perfusion. Apoptotic mechanisms were assessed through quantitative real-time polymerase chain reaction (PCR) and Western blotting. The PTX@Fe3O4 NMBs showed a mean diameter of 186 ± 15 nm, a polydispersity index value of 0.118, a zeta potential of −21.3 ± 2.1 mV, drug encapsulation of 85.4% ± 3.2% and loading capacity of 8.6% ± 0.4% (w/w), with ≤5% drug leakage over 14 days at 4°C. The FA-TLUM + US group achieved the highest tumour growth inhibition rate of 78.6%, significantly superior to other treatment groups (p < 0.001). Contrast-enhanced ultrasound imaging demonstrated enhanced signal intensity and prolonged retention time in targeted NMB groups. Quantitative PCR analysis revealed significant upregulation of pro-apoptotic genes (Bax increased 5.0-fold, caspase-3 increased 4.2-fold) and downregulation of anti-apoptotic genes (Bcl-2 decreased by 76%, survivin decreased by 72%) in the combination therapy group. The PTX@Fe3O4 NMBs combined with ultrasound therapy demonstrated potent antitumour efficacy through enhanced drug delivery and activation of mitochondrial apoptotic pathways, representing a promising theranostic platform for breast cancer treatment.
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