SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Zhenming Wang,Junyu Chang,Hui Zhi,Chunsheng Li,Liang Feng
To achieve a real-time monitoring of ammonia (NH 3 ) from meat spoilage, a self-powered wireless sensing system has been fabricated, including a novel NH 3 sensor, a bluetooth module and a home-made sphere triboelectric nanogenerator (TENG). The system is self-powered and wireless, which meets up well with the demand of meat freshness monitoring, especially for the long-distance transportation. The sensor of the system is based on the polydopamine (PDA)- functionalized carbon nanotube (CNT) coated with polyaniline (PANI), showing superb sensing performance to NH 3 from 0.5 to 20 ppm, with a limit of detection of 38 ppb. And the sensor has presented outstanding anti-interference ability towards common interfering gases and exhibited outstanding stability during the experiments. The sensing system has advantages of portability, sustainability and non-pollution, making it a promising candidate of real-time monitoring application.
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Nanomaterials
·
2021
·Vol. 11
·期 12
·3434
·
IF 5.076
Haodong Zhao,Yali He,Zhihua Wang,Yanbao Zhao,Lei Sun
Emulsified oily wastewater threatens human health seriously, and traditional technologies are unable to separate emulsion containing small sized oil droplets. Currently, oil–water emulsions are usually separated by special wettability membranes, and researchers are devoted to developing membranes with excellent antifouling performance and high permeability. Herein, a novel, simple and low-cost method has been proposed for the separation of emulsion containing surfactants. Polyacrylonitrile (PAN) nanofibers were prepared via electrospinning and then coated by polydopamine (PDA) by using self-polymerization reactions in aqueous solutions. The morphology, structure and oil-in-water emulsion separation properties of the as-prepared PDA@PAN nanofibrous membrane were tested. The results show that PDA@PAN nanofibrous membrane has superhydrophilicity and almost no adhesion to crude oil in water, which exhibits excellent oil–water separation ability. The permeability and separation efficiency of n-hexane/water emulsion are up to 1570 Lm−2h−1bar−1and 96.1%, respectively. Furthermore, after 10 cycles of separation, the permeability and separation efficiency values do not decrease significantly, indicating its good recycling performance. This research develops a new method for preparing oil–water separation membrane, which can be used for efficient oil-in-water emulsion separation.Keywords:polyacrylonitrile;electrospinning;nanofibrous membrane;emulsion separation
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COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 300
·期 1
·1-10
·
IF 1.931
Jiang Binbin,Li Ranhong,He Xu,Chai Yunlong,Chai Yuxin,Wang Yan
In this study, the pyraclostrobin@polydopamine-polyurea microcapsules (Pyr@PNPMC) with anti-photolysis and sustained-release properties were prepared by interfacial polymerization based on O/W Pickering emulsion templates. The effects of water–oil ratio, stirring speed, temperature, and polydopamine nanoparticles (PDANPs) content on the preparation of microcapsules were systematically investigated. Under this condition, the encapsulation efficiency of microcapsules could reach up to 77.7%. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) images indicated that Pyr@PNPMC were prepared successfully, and the microcapsules were a regular sphere with a large number of PDANPs attached to the dense inner layer. According to the results of sustained-release and anti-photolysis experiments, the release rate of Pyr@PNPMC was slightly faster than that of the pyraclostrobin@polyurea microcapsules (Pyr@MC). Under UV light exposure for 7 h, Pyr@PNPMC still retains 83% of the active ingredient, while for Pyr@MC nearly 75% of the active ingredient had been lost.
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2023
·
IF 3.4
Jianmei Lv,Qiping Wu,Sanwang Li,Hanxi Yi,Feifan Xie
Bacterial infection is a leading cause of neonatal death . Ceftazidime , commonly used for neonatal infections , is often used off-label. Blood sampling limits pharmacokinetic (PK) studies in neonatal patients. The dried blood spots (DBS) are a potential matrix for microsampling. Herein, we describe an ultra-performance liquid chromatography with a photodiode array (UPLC-PDA) to determine ceftazidime in DBS from neonatal patients in support of pharmacokinetic studies. The Capitainer® device-based DBS samples containing 10 µL blood were extracted in 70% methanol/water ( v/v ) with acetaminophen as the internal standard (IS). The extraction process was carried out at 20 °C using a block bath shaker at 1000 rpm for 30 min. The extracted ceftazidime was subsequently eluted through an Acquity UPLC HSS T3 column (2.1 × 50 mm, 1.8 µm). Elution was achieved using a water (containing 0.1% trifluoroacetic acid)/acetonitrile linear gradient at a flow rate of 0.5 mL/min, and the analytical time was 3.2 min. The PDA detection wavelength was set at 259 nm. The method underwent thorough validation following the recommendation of the European Bioanalysis Forum (EBF) and the bioanalytical guideline established by the European Medicines Agency (EMA). No interfering peaks were detected at the retention times of ceftazidime and IS. The ceftazidime exhibited a quantification range spanning from 0.5 to 200 µg/mL, and the assay demonstrated good accuracy (intra/inter-assay ranging from 90.1% to 104.8%) and precision (intra/inter-assay coefficient of variations ranging from 4.8% to 11.7%). The method's applicability was demonstrated by analyzing clinical DBS samples collected from neonatal patients.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 37
·50943
·
IF 3.125
Rui Wang,Congzhen Xie,Bin Gou,Huasong Xu,Shoukang Luo,Yan Du,Jiangang Zhou,Hao Yang
Flexible nanocomposite dielectrics with high dielectric constant and discharge energy density have broad application prospects in the field of energy storage. However, dielectrics with high dielectric constant tend to have a high dielectric loss. Herein, we prepared a dielectric composite material with ultra-high discharge energy density by modifying the interface between nanoparticles and poly(vinylidene fluoride-co-hexafluoropropylene) (P[VDF-HFP]). After coating a shell of insulating amorphous SiO 2 (~7 nm) outside the barium titanate (BT), the electric field concentration and current density inside BT particles can be significantly reduced. In addition, coating the SiO 2 shell with a polydopamine (PDA) shell (~7 nm) not only enhances the interface interaction between the nanoparticles and the polymer matrix, but also can form lots of microcapacitors in the composite. As a result, an ultra-high discharge energy density of 13.78 J/cm 3 at the expense of relatively inconspicuous efficiency (~59.8%) in the BT@SiO 2 @PDA/P (VDF-HFP) with 2.5 wt% loading has been achieved under 460 kV/mm. This is mainly attributed to the increases of dielectric constant from 12.1 to 14.2 and the relatively low dielectric loss (0.086) at 100 Hz. Moreover, compared with the pure P (VDF-HFP) (400 kV/mm), the breakdown voltage of the composite with 2.5 wt% loading is surged to 460 kV/mm, which benefited from the hindrance of nanoparticles on carrier migration at low content. This work has realized a thin-film dielectric with ultra-high discharge energy density through a novel design of the nanoparticle structure, providing a theoretical direction for the development of polymer dielectric capacitors.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 28
·期 3
·3465-3474
·
IF 3.056
Bai Maojuan,Xu Chengcheng,Huang Xuanye,Yin Han,Wan Jun
CuSe as an excellent photocatalytic semiconductor material has wildly used in the field of photocatalysis. In this paper, CuSe-PDA/g-C 3 N 4 was designed and synthesized, and the photocatalytic performance of CuSe was further enhanced by the addition of polydopamine (PDA) and graphite phase carbon nitride (g-C 3 N 4 ). The as-prepared CuSe-PDA/g-C 3 N 4 was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), and elemental mapping. The specific surface area and porous characteristics of the material were also studied by N 2 adsorption-desorption isotherm, which the specific surface area were 186.6 m 2 /g and pore size were of 3.1 nm by BET data analysis. The photocatalytic conditions for the degradation of methylene blue (MB) by CuSe-PDA/g-C 3 N 4 were optimized in the experiment. The results showed that the photocatalytic performance of CuSe-PDA/g-C 3 N 4 under visible-light illumination were better than CuSe and PDA owing to the narrow band gap energy and delayed electron-hole recombination. Under the optimized conditions, the removal rate reach to 99% of 50 mg/L MB within 60 min irradiation time. Moreover, the MB removal rate was over 90% through six repeated experiments, which proved that the CuSe-PDA/g-C 3 N 4 composite nanomaterials have good stability and reusability.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 19
·50401
·
IF 2.52
Faming Yang,Chen Xiong,Yingfu Lian,Xiaojun Wang,Zhimei Wei,Shengru Long,Gang Zhang,Jie Yang
Water-in-oil emulsions separation plays a critical role in industrial wastewater treatment. Membrane technology has attracted much interest in water-in-oil emulsions separation field for its excellent separation performance and facile processing method. However, versatile membrane with better solvent-resistance is still absent in chemical industry. In this work, oxidized polyarylene sulfide sulfone (O-PASS) membrane was severed as substrate, on which a hydrophobicity surface was built via coating of octadecyltrichlorosilane (OTS). And polydopamine (PDA) layer was employed and acted as connector between OTS and O-PASS membrane due to its abundant active hydroxyl group. The maximum water contact angle was 132.6° indicating good hydrophobicity of the membrane. Finally, the OTS/PDA/O-PASS composite membranes showed good separation performance for corrosive emulsions: the rejection and flux were 93.0% and 10.0 L/m 2 h for water-in-dichloromethane emulsions, and the rejection and flux were 92.3% and 34.6 L/m 2 h for water-in-n-hexane emulsions. The OTS/PDA/O-PASS composite membrane is a new candidate membrane for water-in-oil emulsions separation. In addition, the superior performance of the composite membrane under harsh environment conditions ensures its usefulness in resistance aggressive solvent.
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Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Xuefeng Sha,Huizhen Huang,Shiyan Sun,Hongye Huang,Qiang Huang,Ziyang He,Meiying Liu,Naigen Zhou,Xiaoyong Zhang,Yen Wei
MXene has emerged as one of the most interesting two-dimensional (2D) nanomaterials , that has been widely explored for various applications, including environmental adsorption. However, the adsorption performance of unmodified MXene is poor and surface functionalization is necessary to endow new properties and improve the adsorption performance. In this work, we reported the fabrication of MXene based bismuth oxide (MXene-PDA-Bi 6 O 7 ) composites for the first time through the mussel-inspired chemistry, which relied on the self-polymerization of dopamine to form polydopamine (PDA) films on MXene for subsequent immobilization of Bi 6 O 7 nanoparticles . The utilization of MXene-PDA-Bi 6 O 7 composites for adsorptive removal of iodide ions and the adsorption parameters on adsorption behavior were examined in details. The surface morphology, chemical structure and chemical compositions of these samples were characterized by a series of techniques. The results demonstrated that the maximum adsorption capacity of MXene-PDA-Bi 6 O 7 towards iodide ions is 64.65 mg/g, which is obviously greater than that of unmodified MXene and MXene-PDA under identical adsorption conditions. In the fabrication strategy, the PDA could be facilely coated on the MXene and provide a platform for further immobilization of the Bi 6 O 7 nanoparticles. This method is simple, easy of operation and can be occurred under benign and mild experimental conditions. Moreover, this method could also be utilized for introduction of other functional components on the MXene and thus multifunctional MXene based composites with designed properties and functions could be fabricated. We believe that this work will open a new avenue for fabrication of functional MXene based composites for environmental treatment.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 47
·49549
·
IF 2.52
Muhammad Awais Ashraf,Junfeng Wang,Baichun Wu,Penglei Cui,Baohua Xu,Xingchun Li
Extraction of lithium from high Mg 2+ /Li + ratio salt lake brine with the nanofiltration (NF) membrane is significantly challenging. Interfacial polymerization was utilized for the facile modification of NF membranes with polydopamine (PDA) and polyethylenimine (PEI) to enhance lithium separation efficiency. Comparing permeability and salts rejection (Li + and Mg 2+ ) of three NF membranes before and after PDA/PEI deposition, it was observed that separation efficiency was not only dependent on steric hindrance but also affected by Donnan exclusion mechanism. In the case of NF270 membrane after facile polymerization, due to small pore size distribution and low charge density confirmed by zeta potential measurements, Li + permeability was reached about 95% at a flux of 21.33 L·m −2 ·h −1 . Although with the DK membrane, separation factor SF Li/Mg was also increased up to 60 after modification, the pore narrowing effect significantly decreased lithium permeability and flux. Experimental results showed that facile modification not only enhanced stability and hydrophilicity but also reduced the high Mg 2+ /Li + ratio from 30 to 4.1 in single-stage separation.
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DESALINATION
·
2024
·
IF 8.3
Chao Wang,Yangbo Qiu,Chenglin Zhang,Feng Li,Long-Fei Ren,Jiahui Shao
Membrane wetting, scaling and low flux are challenging obstacles for membrane distillation (MD). However, the lack of advanced membranes capable of achieving both high flux and high wetting/scaling resistance constrains MD potential applications. Herein, a dense Janus membrane (JM) was facilely developed by co-depositing a dense PVA/PDA layer on a highly porous PTFE substrate to overcome this dilemma and systematically compared with omniphobic PTFE substrates with varied pore sizes for the first time. Results showed that, unlike flux-resistance “trade-off” observed for PTFE substrates, dense JM effectively resisted 0.4 mM SDS at a high flux of 56.8 LMH and retarded membrane scaling by 20 mM oversaturated gypsum. Robust wetting resistance was primarily attributed to the sieving effect of the sub-nanometer surface layer, which greatly protected substrate from SDS adsorption and feed intrusion, and was less affected by severe surface concentration polarization and relatively low substrate LEP than PTFE substrates. Strongly polar PVA/PDA layer provided a much more thermodynamically unfavorable continuous interface for gypsum adhesion than PTFE substrates, which played a key role in determining anti-scaling behavior. In contrast, gypsum still tended to rapidly cause membrane scaling in stagnant zones within PTFE substrates when flux was increased. This study shall provide new insights in designing high-performance membranes for robust hypersaline wastewater treatment, and highlighting dense JMs with a macroporous substrate and a highly hydrophilic dense surface layer as ideal alternatives.
研究领域:
材料科学
·
化学工程
·
环境工程
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NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 14
·12212-12221
·
IF 3.201
Yukun Sun,Dongyun Li,Hui Yang,Xingzhong Guo
Fe3O4@polydopamine@polyamidoamine (Fe3O4@PDA@PAMAM) core–shell nanocomposites were successfully fabricated through a monodispersed Fe3O4 nanoflower synthesis, PDA modification and PAMAM grafting. The as-prepared single Fe3O4@PDA@PAMAM nanocomposite possesses a high relevant saturation magnetization (Ms) (30.25 emu g−1), while the coercivity (Hc) (10.85 Oe) and retentivity (Mr) (0.9062 emu g−1) were extremely low. The obtained Fe3O4@PDA@PAMAM has an adsorption capacity as high as 97.18 mg g−1 for Cu(II), and the adsorption process is in conformity with pseudo-second-order kinetics and the Langmuir isotherm model. Moreover, the effect of pH and thermodynamics of the adsorption process is also discussed briefly.
研究领域:
材料科学
·
环境科学
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高影响因子
BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Shuang Yin,Zhanfang Ma
Sensitivity amplification strategies in electrochemical immunoassays are mainly limited by redox signal leaking, degradation of catalytic activity caused by layers of decoration and the large hindrance effect caused by immunoprobes. Herein, we developed an innovative sensitivity amplification strategy based on the self-sacrificial label-assisted electroactivity conversion of a sensing interface, utilizing Fe 3+ -loaded polydopamine (Fe 3+ -PDA) nanoparticles as the self-sacrificial labels, which can be decomposed under acidic conditions and release Fe 3+ . When the assembled sensing interface was immersed in a prussian blue (PB) precursor solution (a mixed solution of 0.1 M KCl, 0.1M HCl and 1 mM K 3 Fe(CN) 6 ), the as-formed sandwich-type structure was destroyed due to the decomposition of Fe 3+ -PDA caused by HCl in PB precursor solution, resulting in the reduce of interface resistance. The released Fe 3+ reacted with the PB precursor solution and triggered the growth of electroactive PB nanoparticles (PB NPs) on the sensing interface. Assisted by self-sacrificial Fe 3+ -PDA, the sensing interface was converted from electrochemically inactive to electroactive with a strong redox signal, high catalytic activity, and decreased interface resistance. The PB NPs can catalyse H 2 O 2 to amplify the redox signal, thus improving sensitivity. The redox signal and catalysts were generated in the final assembly step, which can avoid signal leaking and decreases of catalytic activity caused by layers of decoration. The decomposition of Fe 3+ -PDA can eliminate the large hindrance effect of the immunoprobe. Ultrasensitive quantification of carbohydrate antigen 125 (CA 125) was realized with a detection range from 0.00001 to 1000 U mL −1 and detection limit of 0.25 × 10 −6 U mL −1 .
研究领域:
生物医学工程
·
分析化学
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