COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Feng Gao,Qi Qi,Xinlei Wu,Jianxing Yu,Jun Yao,Zhihai Cao,Yifang Mi,Qinmin Cui
Multifunctional cationic poly(2-(dimethylamino)-ethyl methacrylate)/Fe 3 O 4 composite nanogels (PQDMAEMA/Fe 3 O 4 CNGs) with degradable, magnetic, redox-responsive, and antibacterial properties were tailored through activators generated by electron transfer atom transfer radical polymerization in inverse miniemulsion systems. The as-prepared PQDMAEMA/Fe 3 O 4 CNGs not only inherited good superparamagnetism of Fe 3 O 4 nanoparticles but also displayed a marked redox-responsiveness (using a disulfide-containing cross-linker) and a reversible pH-dependent loading and release behavior of a model protein (bovine serum albumin). Most importantly, the PQDMAEMA/Fe 3 O 4 CNGs exhibited potent broad-spectrum antimicrobial activity towards Escherichia coli, Staphylococcus aureus, and Canidia albicans . The results reveal that the multifunctional PQDMAEMA/Fe 3 O 4 CNGs have essential promise in tackling bacterial infection and stimuli-responsive applications such as protein adsorption and separation.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 40
·19032-19042
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IF 3.591
Chengmin Hou,Hanxiao Ma,Congjun Cao,Xiaojian Ding,Jingting Duan
The composite particles (St/Fe3O4) of starch and Fe3O4 were prepared by a co-precipitation method. Then AA and HEMA were grafted and cross-linked on St/Fe3O4 by a one-step method to obtain St/Fe3O4-g-p(AA-r-HEMA). The effects of the adsorbent dosage, pH value, initial Cu(II) concentration, time and temperature on adsorption were studied. Experiments showed that St/Fe3O4-g-p(AA-r-HEMA) showed a good adsorption performance for Cu(II), with a unit adsorption capacity of 75.5 mg g−1 and a maximum removal rate of 95.0%. The adsorption process followed the Langmuir model and the pseudo-second-order kinetic model, was dominated by chemical adsorption, and belonged to single-layer adsorption. Renewable performance studies showed that after 8 adsorption cycles, 91.2% of the first adsorption effect was still retained.
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ENVIRONMENTAL MONITORING AND ASSESSMENT
·
2021
·Vol. 193
·期 4
·1-20
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IF 2.513
Wang Jinpeng,Chen Wenyuan,Zhang Ming,Zhou Runjuan,Li Jiyuan,Zhao Wei,Wang Lixian
In this paper, Eichhornia Crassipes stems were used as biomass feedstock, and Fe 2+ was used as the precursor solution to prepare Fe 3 O 4 -modified magnetic mesoporous biochar (Fe 3 O 4 @BC). By using Box-Behnken design (BBD) response surface methodology, the influences of three preparation parameters (X 1 = Fe 2+ concentration, X 2 = pyrolysis temperature and X 3 = pyrolysis time) on the adsorption of methyl orange (MO) by Fe 3 O 4 @BC were investigated, and a reliable response surface model was constructed. The results show that X 1 X 2 and X 1 X 3 have a significant influence on the adsorption of MO by Fe 3 O 4 @BC. The surface area and pore volume of Fe 3 O 4 @BC are controlled by all preparation parameters. The increase of pyrolysis time will significantly reduce the -OH on the surface of Fe 3 O 4 @BC and weaken its MO adsorption capacity. Through the numerical optimization of the constructed model, the optimal preparation parameters of Fe 3 O 4 @BC can be obtained as follows: Fe 2+ concentration = 0.27 mol/L, pyrolysis temperature = 405 °C, and pyrolysis time = 3.2 h. The adsorption experiment shows that the adsorption of Fe 3 O 4 @BC to MO is a spontaneous exothermic process, and the adsorption capacity is maximum when pH = 4. The adsorption kinetics and adsorption isotherms of Fe 3 O 4 @BC to MO conform to the pseudo-second-order kinetics and Sips model, respectively. Mechanism analysis shows that electrostatic interaction and H bond formation are the main forces for Fe 3 O 4 @BC to adsorb MO. This research not only realizes a new way of resource utilization of Eichhornia Crassipes biomass but also enriches the preparation research of magnetic biochar.
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Qiutong Chen,Sihan Rong,Yao Cen,Guanhong Xu,Zhen Xie,Jing Yang,Yong Sun,Qin Hu,Fangdi Wei
Since the sensitivity of the sensing platform using carbon dots (CDs) alone is poor, the development of sensors based on the combination of CDs with other nanomaterials has attracted considerable interest. In this paper, a novel and facile method was established using CDs and Fe 3 O 4 nanoplates (NPs) for the determination of hyaluronidase (HAase) activity. Fe 3 O 4 NPs were introduced to quench the fluorescence of CDs through inner filter effect (IFE) for the first time. The negatively charged HA could bind to the positively charged Fe 3 O 4 NPs via electrostatic attraction to form HA/Fe 3 O 4 NPs complex, resulting in the weakening of the IFE between Fe 3 O 4 NPs and CDs. Hence, the fluorescence of CDs was recovered. With the presence of HAase, HA was hydrolyzed into small fragments which were unable to interact with Fe 3 O 4 NPs. Thus, the fluorescence of CDs was “turn-off” again by Fe 3 O 4 NPs. The activity of HAase was determined in a range of 0.0040−0.12 U mL −1 with a limit of detection of 0.0016 U mL −1 . Both the CDs and Fe 3 O 4 NPs were label-free, low-cost and eco-friendly, making the detection system simple and economical. The proposed method provides a new way of designing new sensing platform.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2021
·
IF 7.963
Changsong Li,Yijing Li,Qiang Li,Junling Duan,Juying Hou,Qin Hou,Shiyun Ai,Houshen Li,Yuechao Yang
Phosphates and organophosphorus cause environmental pollution , and excessive phosphate leads to water eutrophication . Glyphosate , an organophosphorus herbicide, harms the environment and human health. In this study, regenerable magnetic AL/Fe 3 O 4 /La(OH) 3 adsorbents were developed by modifying Fe 3 O 4 and La(OH) 3 on aminated lignin (AL) for phosphate and glyphosate removal. The adsorption capacity for phosphate and glyphosate reached 60.36 mg g −1 and 83.87 mg g −1 when the initial concentrations were 150 mg L −1 and 250 mg L −1 , respectively. The thermodynamic data showed that adsorption is a spontaneous and endothermic process. Adsorption can be applied at pH values ranging from 3 to 11 and is more suitable under acidic conditions. Fe 3 O 4 and La(OH) 3 both enhanced the adsorption capacities of phosphate and glyphosate. Phosphate and glyphosate compete slightly when coexisting in the adsorption process at low concentrations. Due to the magnetic properties of Fe 3 O 4 , the adsorbents can be separated rapidly and effectively with an external magnetic field. 89% adsorption capacity remained after four adsorption-desorption recycles. Thus, AL/Fe 3 O 4 /La(OH) 3 shows potential for phosphate and glyphosate removal as an effective and reusable adsorbent.
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PubMed
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 26
·2974-2980
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IF 2.896
Xinze Wu,Yifei Cao,Bin Sun,Huaixia Chen,Xueping Dang,Xiaolan Liu,Youhong Ai
In this study, magnetic Fe3O4@SiO2@β-cyclodextrin copolymerized microparticles were synthesized and applied for the extraction of methyl parathion and fenthion in lettuce samples followed by HPLC-UV detection. The magnetic β-cyclodextrin copolymerized microparticles were prepared by dispersion polymerization with acryloyl β-cyclodextrin as the functional monomer and ethylene glycol dimethyacrylate as the crosslinker. The composite magnetic microparticles were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, magnetic measurement, and thermogravimetric analysis, and used as the adsorbent of magnetic solid-phase extraction (MSPE) for methyl parathion and fenthion. The extraction conditions including sample pH and ionic strength, desorption solvent type and volume, and adsorption and desorption times were optimized. Under the optimal extraction conditions, an MSPE-HPLC-UV method was developed for the detection of methyl parathion and fenthion in lettuce. Wide linear ranges of 1.0–200 μg kg−1 (R2 = 0.9998) for methyl parathion and 1.5–200 μg kg−1 (R2 = 0.9978) for fenthion were obtained and the limits of detection were 0.3 μg kg−1 for methyl parathion and 0.5 μg kg−1 for fenthion in lettuce, respectively. The proposed method was applied for the determination of methyl parathion and fenthion in lettuce with satisfactory recoveries between 89.2–101.2%, and relative standard deviations were less than 9.1%. Thus, the MSPE-HPLC-UV method has high accuracy and sensitivity for the analysis of methyl parathion and fenthion in lettuce samples.
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高影响因子
TALANTA
·
2020
·
IF 5.339
Yaofang Fan,Yanming Liu,Qihui Zhou,Hao Du,Xueyang Zhao,Fei Ye,Huimin Zhao
Fluorescence resonance energy transfer , a promising method for in situ imaging of miRNA in living cells, has intrinsic limitation on sensitivity and selectivity . Herein, a fluorescent amplification strategy based on catalyzed hairpin assembly indirectly covalent on Fe 3 O 4 @C nanoparticles via short single-stranded DNA was investigated for cellular miRNA detection in living cells, integrating non-enzyme target-active releasing for amplifying the signal output, highly quenching efficiency of Fe 3 O 4 @C nanoparticles with low background, ssDNA assisted fluorescent group-fueled chain releasing from Fe 3 O 4 @C nanoparticles with enhanced fluorescence response. The designed platform exhibits highly sensitive in a wide linear concentration range of 0.450 pM–190 pM and is highly specific for miRNA-20a detection with the ability of discriminating one mistake base. Additionally, the CHA-Fe 3 O 4 @C was successfully applied in imaging visualization of miRNA-20a in the living cell. The strategy provides a promising bioassay approach for clinical research.
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高影响因子
Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Yi Cui,Dongao Zhang,Kelin Shen,Siqing Nie,Meiying Liu,Hongye Huang,Fengjie Deng,Naigen Zhou,Xiaoyong Zhang,Yen Wei
MXene has emerged as one of the most interest two-dimensional layered materials that has been extensively explored for various applications. In this work, a novel biomimetic method has been developed for the first time to fabricate Ti 3 C 2 MXene based magnetic Fe 3 O 4 composites that relied on the self-polymerization of dopamine and subsequent mild temperature pyrolysis. We demonstrated that many organic dyes could be rapidly degraded by the MXene-MNPs composites through Fenton reaction with extremely high efficiency. The degradation efficiency could be greater than 97 % under the optimized experimental conditions. Moreover, the catalysts displayed a good recyclable property after five continuous cycles. Electron paramagnetic resonance analysis and quenching results indicated that both OH and O 2 − were the reactive species and involved in the degradation process. Owing to the universality and mild reaction conditions of mussel-inspired biomimetic method, many other multifunctional composites with great research interest could also be fabricated. We also believe that this work will provide some new insights for fabrication of highly efficient catalysts for advanced oxidation processes and exploring the critical roles of polydopamine in advanced oxidation procedures.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Linfeng Bai,Kezhu Xu,Wanquan Jiang,Min Sang,Qunling Fang,Shouhu Xuan,Xinglong Gong
Advanced nanocatalysts integrating with high activity and recyclability is one of the most important issues in heterogeneous catalysis. Magnetic hierarchical nanostructures comprising noble metal nanocrystals confined within a protecting penetrable shell will be favored as an efficient candidate toward robust catalytic reactions. This work reports a proof-of-concept magnetic separable nanocatalyst with the polydopamine (PDA)-confined-Au-nanocrystals assembled on the hierarchical surface of Fe 3 O 4 @SiO 2 @γ-AlOOH microflower (Fe 3 O 4 @SiO 2 @γ-AlOOH@Au/PDA). Because of the high surface area of γ-AlOOH hierarchical nanoarchitectures, the loading capacity and dispersity of Au nanocrystals are both improved. These magnetic microflowers present excellent catalytic efficiency and cycling performance in reduction of 4-nitrophenol to 4-aminophenol, which can be ascribed to the superior structure of catalyst. After 9 cycles, the activity of Fe 3 O 4 @SiO 2 @γ-AlOOH@Au/PDA maintains as high as 97.3% due to the protection of PDA shell. In comparison to the spherical Fe 3 O 4 @SiO 2 @Au/PDA, the as-prepared Fe 3 O 4 @SiO 2 @γ-AlOOH@Au/PDA microflowers exhibit quicker catalytic dynamic. The concept of hierarchical nanostructure and penetrable PDA protective layer will be instructive for fabricating high-performance nanocatalysts.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 35
·16718-16729
·
IF 3.553
Wang Chen,Wen Hao,Guo Hailing,Wang Xueyan,Shen Yuhua,Xie Anjian
A novel ferroferric oxide (Fe 3 O 4 )@void@zinc oxide (ZnO) nanocomposite was constructed through a template-assisted selective etching method. The experiment results showed that the magnetic saturation value of nanocomposite could reach to 44.07 emu g −1 , indicating the favorable magnetic targeting function. The presence of the void endowed the nanocomposite with high drug doxorubicin (DOX) loading capacity (85.65 μg mg −1 ). The pH-sensitive drug release was realized due to the gating effect of ZnO, and the DOX release rates were 92.7%, 60.8% and 23.4% at the pH values of 5.0, 6.5 and 7.4, respectively (37 °C). Besides, the Fe 3 O 4 @void@ZnO-DOX exhibited desirable antitumor effects attributed to their cellular uptake and above advantages. Therefore, the Fe 3 O 4 @void@ZnO nanocomposite may serve as a promising drug carrier in cancer therapy and other biomedical applications.
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Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Yinghao Xue,Ping Xiang,Yuzhu Jiang,Huilan Lian,Jingyu Mo,Mengying Li
Excessive phosphate in surface water can spur the growth of organism, which put a threat on the bio-safety of drinking water. Different from previous study, sodium acetate (NaAc) was used as modification agent of Fe 3 O 4 , then the magnetic Fe 3 O 4 @ZIF-67 composites with a non-core-shell sturture were synthesized. According to ZIF-67 loading and phosphate adsorption of synthesized Fe 3 O 4 @ZIF-67, the Fe 3 O 4 @ZIF-67 composites with a Co 2+ /Fe 3 O 4 molar ratio of 1:2 was taken into further evaluation. Fe 3 O 4 @ZIF-67 composites exhibited satisfactory adsorption performance and easy magnetic recovery, and the sorption capacity reached 116.59 mg P/g within 180 min (C 0 = 20 mg P/L, 298 K). The maximum adsorption capacity of phosphate was obtained at the neutral pH, and not significantly interfered with ions of K + , Mg 2+ , NO 3 − and SO 4 2- . Remarkably, Fe 3 O 4 @ZIF-67 described enhanced phosphate adsorption ability in the presence of Ca 2+ . To investigate the role of Ca 2+ , two modes (preloading and addition) of Ca 2+ dosing were examined and the improved adsorptive performance could be owing to the synergistic eff ;ect of adsorption and Ca-P micro-precipitation on the surface of Fe 3 O 4 @ZIF-67. During the regeneration process, the performance of desorbent was evaluated by phosphate releasing and secondary adsorption, and the absence or presence of Ca 2+ would have a significant impact on the selection of desorption solution.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Zhaojian Gao,Shuai Zhou,Yingmei Zhou,Hongri Wan,Cai Zhang,Bing Yao,Teng Chen
In this work, a feasible collaborative design method for preparing magnetic superhydrophobic PU-PDA-Fe 3 O 4 -Ag sponge was proposed. Inspired by mussels, polydopamine (PDA) was used as a bio-glue to adhere Fe 3 O 4 , Ag nanoparticles and octadecylamine to the skeleton of the PU sponge. Under the synergistic effect, Fe 3 O 4 , Ag nanoparticles and octadecylamine endowed the PU sponge with magnetic response properties, antibacterial activity and superhydrophobic surface. The obtained superhydrophobic PU-PDA-Fe 3 O 4 -Ag sponge showed high absorption capacity for various oils and organic solvents with up to 22.9–52.0 times its own weight, which possessed a comparable or relatively high adsorption capacity compared with other reported superhydrophobic PU sponges. Due to the magnetic properties and good elasticity of the obtained PU sponge, the adsorbed oil can be quickly circulated through magnetic recovery and mechanical extrusion. After 20 absorption-desorption cycles, the adsorption capacity of the modified sponge remained above 90.9 % of the initial value, and under negative pressure, the sponge can be used as a filter for continuous separation of light oil and heavy oil from water. In addition, the surface-modified PU sponge also shows excellent oil-in-water emulsion degreasing performance, and the separation efficiency of toluene in water can reach 96.4%. Interestingly, the resulting PU sponges exhibited antibacterial activity with the action of Ag nanoparticles, indicating their potential environmental adaptability and durability in bacteria-contaminated oil/water mixture. The multifunctional characteristics of the modified polyurethane sponge prepared in this study have great potential for the practical application of oil spill treatment.
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危险品化学品经营许可证（带存储）