Nanomaterials
·
2020
·Vol. 10
·期 7
·1370
·
IF 4.324
Zhenfeng Lin,Ziwei Pan,Yuhao Zhao,Lin Qian,Jingtao Shen,Kai Xia,Yongfu Guo,Zan Qu
PPy-Fe3O4/Kaolin was prepared with polypyrrole functionalized magnetic Kaolin by a simple, green, and low cost method to improve the agglomeration and low adsorption capacity of Kaolin. PPy-Fe3O4/Kaolin was employed to remove Hg2+and the results were characterized by various methods. Relevant factors, including solution pH, dosage of adsorbent, concentration (C0), and temperature (T), were optimized by Response Surface Methodology (RSM) and Central Composite Designs (CCD). The optimal results show that the importance for adsorption factors is pH >T>C0> dosage, and the optimal adsorption conditions of PPy-Fe3O4/Kaolin are pH = 7.2,T= 315 K,C0= 50 mg/L, dosage of 0.05 g/L, and the capacity is 317.1 mg/g. The adsorption process conforms to the pseudo-second-order and Langmuir models. Dubinin–Radushkevich model shows that adsorption process is spontaneous and endothermic. Moreover, the adsorption of mercury by PPy-Fe3O4/Kaolin was achieved mainly through electrostatic attraction, pore diffusion, and chelation between amino functional groups and Hg2+. PPy-Fe3O4/Kaolin has excellent reproducibility, dispersity, and chemical stability, and it is easy to be separated from solution through an external magnetic field. The experiments show that PPy-Fe3O4/Kaolin is an efficient and economical adsorbent towards mercury.Keywords:magnetic material;polypyrrole;kaolin;response surface methodology;mercury
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 4
·686
·
IF 4.324
Linlin Du,Peng Gao,Yuanli Liu,Tsuyoshi Minami,Chuanbai Yu
The removal of Cr(VI) in wastewater plays an important role in human health and environment. In this work, polypyrrole/hollow mesoporous silica particle (PPy/HMSNs) adsorbents have been newly synthesized by in-situ polymerization, which prevent the aggregation of pyrrole in the process of polymerization and exhibit highly selective and powerful adsorption ability for Cr(VI). The adsorption process was in good agreement with the quasi-second-order kinetic model and the Langmuir isotherm model. And the maximum adsorption capacity of Cr(VI) was 322 mg/g at 25 °C. Moreover, the removal rate of Cr(VI) by PPy/HMSNs was ~100% in a number of binary systems, such as Cl−/Cr(VI), NO3−/Cr(VI), SO42−/Cr(VI), Zn2+/Cr(VI), Fe3+/Cr(VI), Sn4+/Cr(VI), and Cu2+/Cr(VI). Thus, the PPy/HMSNs adsorbents have great potential for the removal of Cr(VI) in wastewater.Keywords:polypyrrole/hollow mesoporous silica particle;chromium(Cr);adsorption
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 6
·833
·
IF 4.034
Zhi Zhang,Qi Lv,Yiwang Chen,Haitao Yu,Hui Liu,Guangzhen Cui,Xiaodong Sun,Ling Li
To reduce electromagnetic pollution as well as increase the accuracy of high-precision electronic equipment, more attention has been paid to new electromagnetic wave (EMW) absorbing materials, which have the advantages of strong absorption, wide absorption bands, and a narrow thickness. In this study, a novel ternary type of the NiS2@rGO/polypyrrole (PPy) sandwich-like structured composites was synthesized via a facile two-step method, in which the hydrothermal method was used to prepare NiS2@rGO binary composites and then the in situ polymerization method was used to synthesize the PPy, which acted as the outer layer of the sandwich-like structure. The morphologies and electromagnetic absorption performance of the NiS2@rGO/PPy were measured and investigated. A sample with 6 wt% NiS2@rGO/PPy loading paraffin-composite obtained an outstanding reflection loss (RL) of −58.7 dB at 16.44 GHz under a thickness of 2.03 mm. Simultaneously, the effective electromagnetic wave absorption bandwidth for RL < −10 dB, which covered 7.04 to 18.00 GHz (10.96 GHz), was achieved by changing the thickness of the absorber from 2.0 to 3.5 mm. The results not only suggest that the NiS2@rGO/PPy composite has excellent performance in the field of EMW absorption but also prove that the novel sandwich-like structure can contribute to appropriate impedance matching through multiple relaxation and interfacial polarization processes.Keywords:graphene;polypyrrole;sandwich-like structure;electromagnetic absorption
研究领域:
材料科学
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电磁学
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 1
·166
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IF 4.324
Hui Liu,Guangzhen Cui,Ling Li,Zhi Zhang,Xuliang Lv,Xinxin Wang
Cobalt sulfide composites have exhibited great potential in terms of microwave absorption, owing to their low price, relatively high capacitance, and excellent electrocatalytic activity. Thus, a novel core-shell like structure comprising cobalt sulfide@polypyrrole (CoS@PPy) composite was synthesized by a facile solvothermal synthesis method and in situ polymerization. When coated by the heterostructure polypyrrole aerogel, CoS@PPy composite exhibited excellent microwave absorption properties with an optimal reflection loss (RL) of −41.8 dB at 6.96 GHz. Furthermore, the absorption bandwidth (RL< −10 dB) of 5.4 GHz could be reached at a coating thickness of 2.05 mm, probably attributing to the synergistic effect of good impedance matching, interfacial polarization, dipole polarization, and conductivity loss. Moreover, this work proposed a loss mechanism mode which probably occurred in the CoS@PPy composites. It was demonstrated that the CoS@PPy composite is a promising material in the field of electromagnetic wave absorption.Keywords:microwave absorption;CoS;PPy;core-shell structure
研究领域:
材料科学
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电磁学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2017
·Vol. 52
·期 20
·12251-12265
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IF 2.599
Li Meixiu,Ji Xuqiang,Cui Liang,Liu Jingquan
Graphene has attracted much attention and triggered extensive anti-corrosion applications due to its excellent electrochemical stability and robust barrier for molecules and ions. In this paper, a novel polypyrrole/reduced graphene oxide (PPy/rGO) nanocomposite was successfully prepared on carbon steel as an efficient protective coating for improving the anti-corrosion property. Graphene oxide (GO) was deposited onto carbon steel via potentiostatic technique, and PPy was obtained simultaneously by oxidation polymerization. Scanning cyclic voltammetry method was adopted to reduce GO into rGO to form PPy/rGO nanocomposite coating. Due to the synergistic effect of PPy and rGO, excellent anti-corrosion performance for carbon steel in simulated seawater was obtained. Impressively, the PPy/rGO-coated carbon steel showed 7.05 times higher corrosion resistance than that of bare carbon steel and revealed the excellent protection efficiency above 95.9%. The anti-corrosion mechanism of the PPy/rGO coating was also proposed. Our results suggested that the PPy/rGO composite coatings could serve as effectively protectors for anti-corrosion of seawater, therefore, they could envision potential applications in naval architecture and ocean engineering.
研究领域:
材料科学
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电化学
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海洋工程
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Lei Wang,Min Wang,Haris Muhammad,Yan Sun,Junkang Guo,Minwang Laipan
The aim of current study was to develop a new material for the fast and efficient removal of hexavalent molybdenum (Mo(VI)) from contaminated water. In this work, a novel adsorbent was synthesized through the polypyrrole intercalation modification of bentonite (PPy-BT) via in-situ chemical polymerization method for effectively removal of Mo(VI) from aqueous solution. The surface morphology and chemical composition of PPy-BT composites were investigated by X-ray diffraction, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectrometer, scanning electron microscopy techniques and X-ray photoelectron spectroscopy. PPy and BT could well resist the aggregation of each other, and therefore resulted in a loose-packed structure and good exposure of active sites. Using materials for the adsorption of Mo(VI) revealed has a maximum adsorption capacity of 100.17 mg/g at 25 °C and pH 4.0 by the Langmuir model. The adsorption kinetics and isotherm data are found to be well elucidated through pseudo-second-order and Langmuir models. Moreover, high regeneration ability (>89.3%) of PPy-BT was noted for five consecutive adsorption–desorption cycles. These findings highlight the potential of PPy-BT for practical water treatment applications. The intercalation material of PPy-BT could provide a new strategy to develop cost-effective clay-based nanomaterials for wastewater treatment.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
e-Journal of Surface Science and Nanotechnology
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2023
·Vol. 21
·期 1
·1-8
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IF 0.7
J. F. Huang,F. H. Tao,F. Y. Li,Z. Y. Cai,L. Z. Pei
Polypyrrole (PPy)/CuBi2O4 nanosheets (NSs) were prepared by an in situ polymerization process and the NS-modified glassy carbon electrode (GCE) for electrochemical determination of benzoic acid was studied. The structure, morphology, and functional groups of the PPy/CuBi2O4-NSs were analyzed by X-ray diffraction, transmission electron microscopy (TEM), high-resolution TEM, and Fourier transform infrared spectroscopy. The obtained NSs contain a tetragonal CuBi2O4 phase, and nanoscale PPy particles attach to the surface of the NSs. The electrochemical responses of the PPy/CuBi2O4-NS-modified GCE in 0.1 M KCl solution with benzoic acid were investigated by the cyclic voltammetry (CV) and electrochemical impedance spectroscopy. An irreversible CV peak is located at −0.84 V on the PPy/CuBi2O4-NS-modified GCE in 2 mM benzoic acid and 0.1 M KCl solution. The intensities of the CV peaks show linear variation with increasing the scan rate and concentration of benzoic acid. The linear range is 0.001−2 mM with a detection limit of 0.52 μM. The PPy/CuBi2O4-NS-modified GCE shows high stability and reproducibility. The prepared PPy/CuBi2O4-NSs have great promise in the electrochemical detection of benzoic acid.
研究领域:
材料科学
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分析化学
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DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
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2013
·Vol. 35
·期 5
·574-578
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IF 4.929
Jingwen Liao,Haobo Pan,Chengyun Ning,Guoxin Tan,Zhengnan Zhou,Junqi Chen,Shishu Huang
In this article, taurine, one of the small biomolecules associated with bone metabolism, is firstly utilized to induce the fabrication of nano-architectured conducting polypyrrole (NCPPy) on biomedical titanium in diverse pH values of phosphate buffer solution (PBS). Accordingly, the possible mechanism for the fabrication of NCPPy is proposed, which is dependent on the states of polytaurine from the polymerization of taurine, i.e., the inability of forming polytaurine and unordered restricted space results in taurine-incorporated and polytaurine-incorporated tightly packed nanoparticles (pH 6.2 and 8.0), respectively, and however, ordered restricted space constructed by polytaurine chains induces the fabrication of polytaurine-incorporated nanopillars (pH 6.8) and polytaurine-incorporated nanowire networks (pH 7.4).
研究领域:
生物医学工程
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材料科学
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骨科
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DOI
PubMed
高影响因子
Applied Sciences-Basel
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2020
·Vol. 10
·期 6
·1985
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IF 2.474
Jialu Zhang,Hao Xu,Jie Guo,Tianchi Chen,Hongtao Liu
To facilitate the recycling and reuse of cigarette filters and oil/water separation, a superhydrophobic cigarette filter was made by coating with dodecanethiol-modified polypyrrole (Ppy) particles by a dip-coating method. SEM, FTIR, and XPS were used to analyze the surface morphology and chemical compositions. The as-prepared superhydrophobic cigarette filter can realize wettability alteration via changing the ammonium persulfate (APS) concentration from 0.15 mol/L to 3 mol/L, and the contact angle increased from 0° on the original cigarette filter to 155° with a sliding angle of 5°. The superhydrophobic cigarette filter could effectively separate various oils and organic solvents. The separation efficiency was 98.8% and the separation stability was good. Furthermore, the as-prepared superhydrophobic cigarette filter had a large oil absorption range and could absorb different oils and organic solvents, including petroleum ether, engine oil, vegetable oil, n-hexane, and chloroform, with maximum absorption capacities ranging from 9.4 g/g to 22.7 g/g. According to the above results, we believe that the as-prepared superhydrophobic cigarette filter should have great potential in the recovery of solid waste and high-efficiency oil/water separation.Keywords:polypyrrole;superhydrophobicity;oil/water separation;cigarette filter
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ENERGY & FUELS
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2022
·
IF 4.654
Guodong Zhang,Weiqiang Cao,Haixia Zhang,Ying Hou,Junjie Guo
Polypyrrole (PPy) has great potential for applications as a supercapacitor electrode owing to its excellent pseudocapacitance. However, the large volume changes during the rapid charge and discharge process lead to damage to the structure, which is the main obstacle to practical applications. Here, the core–shell structure composite composed of magnetic ferroferric oxide (Fe3O4) nanoparticles and PPy was prepared by solution polymerization. In the Fe3O4/PPy composite, Fe3O4 nanoparticles play the role of reaction template, which can be arranged in a line under a magnetic field, thereby starting the adhesion polymerization of PPy to form a stable core–shell structure with excellent capacitance. The as-synthesized Fe3O4/PPy electrode presents a significantly enhanced specific capacitance of 697 F g–1 at 1.0 A g–1. In particular, the as-synthesized Fe3O4/PPy composite achieved a high energy density of 96.8 Wh kg–1 at 500 W kg–1. This study paves a way to develop materials with high electrochemical performance and may promote the practical application of high-capacity energy storage materials.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Materials Today Communications
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2025
·
IF 4.5
Rui Zhao,Wenbo Jia,Yuxia Shi,Xianhan Shao,Hankun Wang,Tingxi Li,Mingliang Ma,Wenhui Zheng,Yong Ma
In the face of 5 G technology's rapid growth and expansion, the need for advanced electromagnetic wave absorbing materials continues to increase due to their critical role in mitigating interference and ensuring efficient system operations. These materials are essential for effectively reducing signal interference, which, in turn, enhances signal quality and improves the overall performance of communication systems. In this work, ternary core-shell SiO 2 /NiCo 2 O 4 nanosheets/polypyrrole (PPy) (SNCP) fibers have been fabricated using electrospinning and self-assembly methods, achieving outstanding electromagnetic wave absorption performances. At 1.66 mm thickness, the minimum reflection loss (RL min ) reaches −59.87 dB, while at 1.92 mm, the effective absorption bandwidth (EAB) is 5.94 GHz. Additionally, radar cross-section (RCS) simulation outcomes manifest that SNCP exhibits excellent electromagnetic wave attenuation capabilities, with a maximum RCS reduction of 16.27 dB m². The outstanding electromagnetic wave absorption performance is a result of the dielectric properties provided by the SiO 2 fibers matrix, the magnetic properties of the NiCo 2 O 4 nanosheets, the weak conductivity of the PPy shell, and the synergistic interactions and structural effects of the ternary composite. This research offers significant insights into designing and optimizing ternary electromagnetic wave absorbing materials.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Yun Xue,Xingan Feng,Jiadong Wang,Jianzhang Gao,Lijun Zhang,Qi Chen,Fuqiu Ma,Yongde Yan
The immobilization of uranium in nuclear wastewater is of paramount importance for environmental and human health. However, there is a paucity of research on the immobilization of uranium in alkaline wastewater, particularly with regards to the application of novel electrodes. This article presents the utilization of an electrochemically polymerized polypyrrole stainless steel (PPy-SUS304) electrode for the effective electrochemical deposition and removal of uranium from alkaline wastewater containing uranium. According to the electrodeposition results, the uranium deposition efficiency of the novel electrode reached 96.82 %, with a uranium deposition rate of 0.048 mg U/(h·cm 2 ) and a charge efficiency of 0.055 mg U/C. These findings demonstrate the successful electrochemical reduction of UO 2 (CO 3 ) 3 4- in alkaline uranium-containing wastewater using the novel electrode, resulting in improved charge deposition efficiency. The electrode surface products were investigated using scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDS), and X-Ray Photoelectron Spectroscopy (XPS). The SEM and EDS results demonstrate the formation of a uniform PPy film on the surface of SUS304. In addition, the White light interferometer (WLI) test reveals that the PPy-SUS304 electrode exhibits increased roughness compared to the SUS304 electrode. The XPS results revealed that the electrode surface products of PPy-SUS304 were actually U compounds constituted of U(IV) oxides or hydroxides. This study provides a new perspective for the development of novel electrodes to suppress side reactions and efficiently recover uranium from alkaline uranium-containing wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）