MICROCHIMICA ACTA
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2021
·Vol. 188
·期 7
·1-14
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IF 5.833
Shi Zhaoxia,Xia Ling,Li Gongke,Hu Yufei
Based on platinum nanoparticle–embedded raspberry-liked SiO 2 , a sensitive and selective electrochemical sensor was developed for simultaneous determination of eugenol (EU) and methyleugenol (MEU). Raspberry-liked SiO 2 (RL-SiO 2 ) was characterized with open pores on the surface, which can be used as a path for utilizing the inner space fully. So, platinum nanoparticles (Pt NPs) could be embedded in the inner and outer surface of RL-SiO 2 . As a carrier, RL-SiO 2 not only avoided the agglomeration of the Pt NPs but also improved the catalytic performance. Therefore, the prepared Pt NPs@RL-SiO 2 /GCE exhibited excellent electrocatalytic activity for simultaneous determination of EU and MEU; the linearity ranges were 0.50 ~ 60 μmol/L for EU at a working potential of 0.65 V (vs. saturated calomel electrode) and 0.50 ~ 50 μmol/L for MEU at a working potential of 1.10 V; the detection limits were 0.12 μmol/L and 0.16 μmol/L ( S/N =3); and the relative standard deviations (RSDs) were 3.2% and 4.5%, respectively. In addition, Pt NPs@RL-SiO 2 /GCE was successfully applied to the analysis of fish samples; the obtained recoveries were between 92.0 and 107%. Notably, the results conducted on samples were highly consistent with those obtained from high-performance liquid chromatography. It can be concluded that the study provided a simple method for simultaneous electrochemical determination of EU and MEU in fish samples. Graphical abstract
Schematic illustration of the preparation of RL-SiO2@Pt NPs/GCE for simultaneous determination of eugenol and methyleugenol in fish samples.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Weikang Wang,Haotian Xu,Weiwei Zhao,Junde Zhao,Mengyue Jiang,Shujuan Liu,Wei Huang,Qiang Zhao
Flexible free-standing electrode with special hierarchical structure have received widespread attentions due to the increased specific surface area, shortened transport path of electrolyte ions and accelerated ion transmission. Herein, for the first time, the flexible free-standing three-dimensional (3D) flower-like polypyrrole/5,10,15,20-tetrakis(4-carboxylphenyl)porphyrin copper (II) (TF-PPy/Cu-TCPP) nanocomposite electrode with hierarchical PPy micro-flower arrays on the surface has been fabricated via the combination of electrophoretic deposition and electrochemical polymerization. The growth mechanism is involved in the following aspects. I) The wrinkled Cu-TCPP nanosheets provide abundant porous channels to facilitate the immersion of pyrrole molecules and uniform cross-linking of PPy. II) The rough surface of the PPy/Cu-TCPP composite film provides rough sites for the growth of hierarchical TF-PPy arrays under the assistance of H 2 bubbles. The collaborative advantages of 3D conductive networks and the hierarchical TF-PPy arrayed on the rough surface of electrode facilitate the fast ion/electron transport for the enhanced electrochemical performances. The corresponding TF-PPy/Cu-TCPP electrode shows an areal capacitance of 593 mF cm −2 at 0.5 mA cm −2 , which is superior to the PPy/Cu-TCPP electrode (351 mF cm −2 ) and the pristine PPy (287 mF cm −2 ). The symmetric supercapacitor exhibits the energy density of 5.94 μW h cm −2 at a highest power density of 25 μW cm −2 . This work will further enrich the valuable design concepts of flexible free-standing electrode with hierarchical structure for energy storage and conversion.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Zheng Tan,Xiangcai Ge,Guochang Wen,Bo Ge,Guina Ren
Given the problems in sewage treatment and clean water production, this study developed a solar steam generating device. Such a developed device comprised a superhydrophobic photocatalytic layer and a polypyrrole photothermal layer. To be specific, the superhydrophobic photocatalysts were capable of selectively adsorbing surface organic solvents and photodegrading dissolved pollutants, while the polypyrrole photothermal layer had a function of absorbing light energy and forming an interfacial heating layer to avoid heat loss. To improve the photodegradation ability, the photocatalyst of Bi 2 MoO 6 was added, and its crystal structure and specific surface area were investigated specifically. The photocatalyst was supported on a fabric substrate to form a bulk material, thereby avoiding the defects of poor reuse of powder catalysts. After 8 cycles, the degradation efficiency remained higher than 98 %. In addition, the fabric exhibited an excellent mechanical stability, of which the average friction coefficient remains stable. Interestingly, after the sewage treatment, the fabric could act as the substrate of photothermal devices to ensure floating. The steam production efficiency was improved by the synergistic effect of the polypyrrole photothermal layer and the fabric.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Hesong Ren,Tian Li,Huagao Wang,Zihao Guo,Tanlin Chen,Fanbin Meng
It is of great significance to find high-efficiency microwave absorbing materials with corrosion resistance to improve the environmental adaptability and survivability of military targets in harsh chemical environment. Corrosion will lead to the degradation of its microwave absorption performance, and hinder its further application in the actual environment. Herein, a new strategy of chiral small molecule soft-template was proposed for the synthesis of superhelical chiral polypyrrole nanofibers, which can be developed as a promising high-performance anticorrosive microwave absorber. The helical polypyrrole nanofibers (HPPy) were found to enhance impedance matching and electromagnetic wave attenuation ability due to the enhanced dielectric loss and additional magnetic loss from electromagnetic cross-polarization induced by supramolecular chirality. The optimal HPPy shows excellent microwave absorption performance with two reflection loss peaks of − 44.5 dB and − 11.9 dB respectively, which can extend the effective absorption bandwidth up to 5.4 GHz at a loading of only 6 wt%. Furthermore, the correspongding HPPy-EP coatings can give a long-term remarkable corrosion protection capability (96.83%) after 21 days of immersion in corrosive mediumin due to their spatial barrier effect and the passivation effect. The superhelical chiral polypyrrole could open new avenues toward excellent anticorrosive microwave absorption, especially in marine environment.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Shizhu Song,Qi Li,Lifang Zhang,Yanqing Wang,Xiaojuan Liu
Here, N -doped hollow carbon sphere (NHCS)-supported (1 1 1)-plane-engineered sub-5-nm Pt (Pt-NHCS) catalysts regulated precisely by imidazolium ionic liquids were synthesized successfully and used to catalyze oxygen reduction. The (1 1 1)-plane engineered Pt nanocrystals with a diameter of 4.5 ± 0.5 nm were homogeneously deposited on the 3-dimensional spherical nanoshells. The resulting Pt nanocrystals anchored on the carbon skeleton exhibit a stable configuration in both alkaline and acid electrolytes with the help of imidazolium cations and pyrolysis. Among all as-prepared catalysts, the optimized Pt-NHCS shows remarkable long-term durability. Specifically, Pt-NHCS maintains 95.3% of the original current density after 10,000 potential cycles, while Pt/C benchmarks exhibit a retention of 78.5%. Accelerated durability test results indicate that Pt-NHCS exhibits a high efficiency of 96 % in comparison with initial current density, while a value of 86% for Pt/C. Density functional theory calculations demonstrate that reactive Pt(1 1 1) planes with well-defined Schottky defects and vacancies adsorb and activate oxygen molecule rapidly while desorbing the reaction intermediates.
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Nano Energy
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2021
·
IF 17.881
Jintao Zhang,Sanming Hu,Zhijun Shi,Yifei Wang,Yanqiang Lei,Jing Han,Yao Xiong,Jia Sun,Li Zheng,Qijun Sun,Guang Yang,Zhong Lin Wang
Environment issues calls for eco-friendly, recyclable, and biodegradable natural materials for the extensive application of distributed energy harvesting triboelectric nanogenerators (TENGs) and wearable self-powered interfaces. Biocompatible bacterial cellulose (BC) with high crystallinity , good mechanical properties and distinctive porous network is ready to construct biodegradable and eco-friendly TENGs. Here, we develop an eco-friendly and recyclable all-cellulose energy-harvesting and interactive device based on sandwich-structured BC-TENG. It is composed of pure BC and conductive BC precipitated with conducting and reinforced nanomaterials as friction layers and electrodes, respectively. Degradation experiments are conducted in this work to demonstrate the active materials can be completely degraded within 8 h under the condition of cellulolytic enzyme . We have also carefully investigated the output performances of the prepared all-cellulose TENG, which shows a maximum open-circuit voltage of 29 V, short-circuit current of 0.6 μA, and output power at 3 μW. The all-cellulose TENG is readily utilized to power commercial electronics and functionalize as a wearable sewing interface to control an electronic piano. This work provides an efficient route to preparing all-cellulose energy-harvesting and interactive device with good biodegradability, which is of great importance in eco-friendly electronics, bio-adaptive human-machine interfaces and intelligent biomimetic functional devices.
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ANALYTICA CHIMICA ACTA
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2021
·
IF 6.558
Jiayang Zhang,Xueping Dang,Jiahuan Dai,Yuling Hu,Huaixia Chen
An electrochemical assistance solid-phase microextraction (EA-SPME) was developed based on amino functionalized multi-walled carbon nanotube/polypyrrole (MWCNTs-NH 2 /PPy) composite coating. It was applied for the extraction of eight phenols in food contact material, including 2-chlorophenol, o-cresol, m-cresol, 2,4-dichlorophenol, 4- tert -butylphenol, 4-chlorophenol, 4-tertoctylphenol and alpha-naphthol. MWCNTs-NH 2 /PPy coating was characterized by scanning electron microscopy, transmission electron microscope , X-ray energy spectrometer, X-ray diffraction, Fourier transform infrared and thermogravimetric analysis . The adsorption mechanism of phenols on the composite coatings was investigated. The coating modified steel-wire as an extraction fiber has good electroconductibility, reproducibility and long service life. A determination method for the eight phenols was established by EA-SPME coupled with gas chromatography-flame ionization detection. Under the optimal experimental conditions (extraction temperature: 40 °C; extraction time: 30 min; stirring rate: 600 rpm; NaCl concentration: 0.15 g mL −1 ; desorption temperature: 250 °C and desorption time: 4 min), the detection linear range was 0.005–50 μg L −1 ( R 2 >0.99), and the detection limit was 0.001–0.1 μg L −1 (S/N = 3). For the quintuple analysis of 50 μg L −1 phenols, the single fiber RSDs were 2.2–12.4%, and the fiber-to-fiber RSDs were 1.9–10.5%. The method was used to detect the migration quantity of the eight phenols from five canned packaging materials, which showed satisfactory recovery 87.3–118.9%.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Hui He,Yuexin Wang,Juan Li,Shanliang Jiang,Subhan Sidra,Wenxue Gong,Ying Tang,Yang Hu,Rule Wei,Dongxiao Yang,Xuesheng Li,Zhongxing Zhao
High light adsorption and fast charge separation are crucial for photo-Fenton catalytic activity of MOFs. Herein, bottom-up design was proposed to fabricate polypyrrole (PPy C ) nanowires in MIL-88B(Fe) cages as photo-Fenton catalyst for Sulfamethoxazole (SMX) efficient degradation. Pyrrole was prior anchored into MIL-88B(Fe) cluster via Fe-N coordination, and then the additional monomer pyrrole was further triggered bottom-up polymerization in confined cages of MIL-88B(Fe) and formed PPy C @Py-MIL(Fe) composite. These PPy C nanowires were dispersed in Py-MIL(Fe) cages and tightly connected with MOFs clusters via Fe-N bonding. Characterization proved that: (1) Interfacial Fe-N can significantly promote the efficient electron transport from PPy C nanowires to Py-MIL(Fe), enhance optical absorption property, and construct strong Lewis acidic sites and ligand vacancies in PPy C @Py-MIL(Fe). (2) The confined PPy C nanowire via Fe-N connection remarkably promote photo-generated electron-hole separation, Fe 2+ |Fe 3+ redox ability of MOF, and improved photo-electric corrosion ability. As a result, it significantly enhanced the photo-Fenton catalytic performance for SMX degradation. Catalytic oxidation was attributed to the generation of ‧OH species that oxidized 93% SMX in 60 min, showing ultra-rapid degradation and TOC removal rates of 33.7 min −1 ·mg·g −1 and 8.68 min −1 ·mg·g −1 respectively, which was about 4–220 times higher than those reported state-of-the-art catalysts. Additionally, the PPy C @Py-MIL(Fe) catalyst showed minimal loss in catalytic activity even after recycling for 10 times, exhibiting good recycling stability compared to many MOFs. Systematic analysis shown that in-situ anchored growth of polypyrrole in confined porous cages of MOF can effectively enhance the catalytic activity and stability of MIL-88B(Fe), and has great development potential applications for photo-Fenton catalytic degradation of organic pollutants.
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Frontiers in Bioengineering and Biotechnology
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2021
·
IF 5.89
Bao Jianfeng,Guo Shuangshuang,Zu Xiangyang,Zhuang Yuchuan,Fan Dandan,Zhang Yong,Shi Yupeng,Ji Zhenyu,Cheng Jingliang,Pang Xin
Photothermal/magnetothermal-based hyperthermia cancer therapy techniques have been widely investigated, and associated nanotechnology-assisted treatments have shown promising clinical potentials. However, each method has some limitations, which have impeded extensive applications. For example, the penetration ability of the photothermal is not satisfactory, while the heating efficiency of the magnetothermal is very poor. In this study, a novel magnetite vortex nanoring nanoparticle-coated with polypyrrole (denoted as nanoring Fe3O4@PPy-PEG) was first synthesized and well-characterized. By combining photothermal and magnetothermal effects, the performance of the dual-enhanced hyperthermia was significantly improved, and was thoroughly examined in this study. Benefiting from the magnetite vortex nanoring and polypyrrole, Fe3O4@PPy-PEG showed excellent hyperthermia effects (SAR = 1,648 Wg–1) when simultaneously exposed to the alternating magnetic field (300 kHz, 45 A) and near-infrared (808 nm, 1 W cm–2) laser. What is more, nanoring Fe3O4@PPy-PEG showed a much faster heating rate, which can further augment the antitumor effect by incurring vascular disorder. Besides, Fe3O4@PPy-PEG exhibited a high transverse relaxation rate [60.61 mM–1 S–1 (Fe)] at a very low B0 field (0.35 T) and good photoacoustic effect. We believe that the results obtained herein can significantly promote the development of multifunctional nanoparticle-mediated magnetic and photo induced efficient hyperthermia therapy.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2021
·Vol. 168
·期 7
·077521
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IF 4.316
Rongqian Meng,Jianke Tang,Xiaojun Wu,Shengjian Zhang,Xin Wang,Qiaoling Li,Riya Jin
A molecularly imprinted polymer (MIP) with 3D worm-like nanorod structures was constructed by cyclic voltammetry (CV) polymerization, using 3,4-ethylenedioxythiophene (EDOT) and pyrrole (Py) as bifunctional monomers, and rutin as the template on a glassy carbon electrode (GCE). The optimum polymerization conditions of MIP were obtained by the orthogonal test. The range analysis suggested that the potential range was the most influential factor. Compared with MIP/1.5 and MIP/1.9, the MIP films prepared in the potential range of 0–1.7 V (MIP/1.7) had better current response to rutin, faster charge transfer rate and higher doping levels by differential pulse voltammetry (DPV), Chronocoulometry and X-ray photoelectron spectroscopy (XPS) analysis. Rutin could be detected in the concentration range of 0.5 nM to 1 μM, and 5 to 50 μM with the low detection limit as 0.24 nM (S/N = 3). Moreover, MIP/1.7 exhibited 3-fold increase current response toward rutin by DPV when compared with the corresponding non-imprinted polymer (NIP), revealing the success of the imprinting. This sensor also exhibited high selectivity, good long-term stability, and acceptable reproducibility. The rutin content in Flos Sophorae Immaturus (FSI) was 25.37% with good accuracy.
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JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 8
·1-10
·
IF 3.097
Xing Jianyu,Dang Wenwen,Li Jingchang,Huang Jumei,Bai Bo,Zheng Dan,Zhang Xiao
Stimuli-responsive controlled release system is an effective way to increase the efficiency of agrochemicals and reduce environmental pollution. In this work, a novel polypyrrole@gelatin/poly (acrylic acid) (PPy@Gel/PAA x ) hydrogel with a semi-interpenetrating network structure was synthesized by gelatin, polypyrrole (PPy) and acrylic acid (AA). The structure and property of the hydrogel were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, ultraviolet–visible spectroscopy and infrared imaging. The efficiency of the controlled release system was systematically studied by using carbendazim as a template drug. The results indicated that PPy@Gel/PAA x not only has outstanding light-sensitive property, but also has good water retention performance. Therein, PPy used as a light-sensitive component, could convert the absorbed light energy into heat energy. This kind of photothermal conversion could lead to helix-coil structural transition of gelatin which promotes the release of carbendazim by changing the pore diameter of the hydrogel. Consequently, excellent controlled-release capacity and water retention performance enable PPy@Gel/PAA x hydrogel to be a potential candidate in agricultural application.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Xinwen Huang,Anhua Jiang,Xiaoqiang Jin,Hangdi Yu,Yirong Zhang,Shasha Xia,Zongjian Liu,Geshan Zhang,Dionysios D. Dionysiou
Nitrogen-doped hollow carbon (N-HC) nanospheres were fabricated by in-situ pyrrole polymerization on the hard template of ferroferric oxide nanospheres followed by acid treatment and calcination . The morphology, microstructure, surface composition and electroactivity for triclosan detection of as-prepared N-HC nanospheres were investigated. These N-HC nanospheres own single or double shells (shell thickness ≈ 20 nm, average diameter ≈ 250 nm). X-ray photoelectron spectroscopy measurement shows that the doped nitrogen in N-HC nanospheres is mainly graphitic and pyridinic nitrogen. N-HC nanospheres modified glassy carbon electrode (GCE) exhibits excellent electrochemical activity for electrooxidation of triclosan, resulting in the high efficiency for triclosan detection. The detection limit of triclosan is 30 nM and the limit of quantification is 100 nM, while a good linear response is obtained from 0.09 to 20 μM under the optimal detection conditions. In addition, the N-HC nanospheres decorated GCE shows great stability, reproducibility, and applicability for triclosan detection in real waters, including tap water , lake water, and river water from Hangzhou, China. The wide linear range and lower cost of N-HC based sensor synthesized in this work point to promising properties for further study and testing for potential practical application in water environment.
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危险品化学品经营许可证（带存储）