JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2017
·Vol. 93
·期 4
·1147-1158
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IF 3.135
Chongzhuo Bao,Chen Mingxin,Guangrong Liu,Xin Jin,Qiang Huang
BACKGROUND Uniform and well-dispersed hollow microspheres of oligoaniline were synthesized by a facile and template-free method in alkaline medium. The morphology of oligoanilines was controlled from hollow to hard microspheres, by simply changing the volumes of alkaline medium. SEM, TEM, XRD, FTIR and physical adsorption of nitrogen were used to characterize the products. Hexavalent chromium ion uptake experiments were run with these aniline oligomers. RESULTS Adsorption experiments showed that the removal of chromium ions was strongly dependent on the initial pH of the solution. The pseudo-second-order kinetic and Langmuir isotherm models were well correlated with the experimental data. The adsorption of Cr(VI) and synergistic reduction to Cr(III) were confirmed by analyzing remnant chromium in the liquid and XPS detection of the exhausted adsorbent. A redox/pseudo-protonation process was suggested as the mechanism to explain the Cr(VI) removal. The adsorbed chromium ions could be desorbed by NaOH solution. The higher desorption efficiency of 96.2% was achieved by using 1.0 mol L -1 NaOH as the desorption agent. CONCLUSIONS It was observed that the hollow microsphere were the most effective adsorbent of the three adsorbents and its removal efficiency reached 99% to remove 60 mg L -1 Cr(VI). The facile fabrication, efficient removal of Cr(VI) and simple regeneration offered an option to remove Cr(VI) contamination from natural water and industrial wastewater. © 2017 Society of Chemical Industry
研究领域:
环境科学
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材料科学
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DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 17
·10394-10407
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IF 3.945
Jing Xiao,Cong Wang,Bai-Qi Feng,Tian-Yu Liu,Shao-Yi Jia,Hai-Tao Ren,Yong Liu,Song-Hai Wu,Xu Han
Although synthesis of oligoaniline (OANI) by persulfate and aniline has been investigated in the recent years, the impact of phenol on the synthesized soluble OANI is still not clear. In this study, our results indicate that phenol and pH mediate the production of the blue water-soluble OANI (OANIblue) in the reaction between sodium persulfate (SPS) and aniline under alkaline conditions, and the yields of OANIblue increase with increasing concentrations of phenol and pH values. Quenching experiments rule out the contributions of SO4˙− and ˙OH to aniline oxidation and imply that the non-radical activation of SPS is an important pathway in the formation of OANIblue. MALDI-TOF-MS analysis indicates that phenol apparently inhibits the polymerization degree of aniline in that the molecular weights of OANIblue gradually decrease from 1586.4 to 684.6 when phenol is increased from 0 to 2.0 mM. FTIR and Raman analyses confirm the structure of aniline oligomers in OANIblue and indicate that phenol inhibits the phenazine-like structure in OANIblue and facilitates the transformation of benzenoid rings to quinoid rings in the oxidation products. However, simultaneous activation of SPS by phenol and aniline is likely to occur in the reaction system with the formation of PhNH˙, as indicated by DFT calculations. The high scavenging reactivity of phenol towards both PhNH2˙+ and PhNH˙ implies that PhNH2˙+ and PhNH˙ are not the intermediates in the formation of OANIblue. DFT calculations also reveal that apart from the one-electron transfer pathway between aniline and SPS, the two-electron transfer pathway is also likely to occur in the presence of phenol, resulting in the formation of PhNH+/PhN˙˙ without producing PhNH2˙+ and PhNH˙. The produced PhNH+/PhN˙˙ intermediates then couple with aniline, PhNH+, aminophenyl sulfate and its hydrolysate to form dimers, trimers, oligomers, and eventually OANIblue. This study not only describes a novel method to prepare water-soluble OANI, but also gives new insight on the importance of phenol in the production of OANIblue.
研究领域:
化学
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材料科学
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DOI
PubMed
高影响因子
International Journal of Electrochemical Science
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2023
·
IF 1.5
Yuwei Ye,Wei Liu,Zhiyong Liu,Haichao Zhao,Liping Wang
Novel trianiline-containing sol-gel hybrid coatings were prepared by one-step electrodeposition technology on the surface of Q235 steel. The chemical component, microstructure of the as-prepared coatings were measured by FTIR, UV-vis, SEM. The effects of deposition time on the thickness, contact angle (CA) and surface roughness of coatings were investigated. The results showed that the modified silica coatings exhibited an excellent hydrophobic nature. By comparing with various deposition times (100, 300, 500, 700 s) under the deposition potential of -1.5 V, the coating under the deposition time of 500 s presented the best anti-corrosion effectiveness for bare steel substrate in 3.5 wt.% NaCl solution as verified by Tafel curves and electrochemical impedance spectroscopy (EIS).
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
MACROMOLECULAR RAPID COMMUNICATIONS
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2010
·Vol. 31
·期 21
·1886-1891
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IF 4.263
Wei Xiong,Hanfu Wang,Yanchun Han
Novel dendritic triblock co-oligomer (14G2A3) consisting of ester dendrons and aniline oligomer was synthesized and found to self-assemble into fibrils in THF. Studies reveal that the formation of the fibrils originates from both of the amphiphilic interactions between the ester dendrons and oligoaniline, as well as the intermolecular π-π stacking among oligoanilines. The shape effect of dendrons on molecular packing was comparatively analyzed with packing parameter against its linear analogous compound. At the same time, the driving forces that dominate the final aggregating state of the block oligomer were separately investigated using the bulky-group protecting method, which allows release of the intermolecular π-π stacking of oligoaniline in a controlled manner. Results show that both the introduction of dendrons and the intermolecular π-π stacking will increase the packing parameter of the block oligomer and, consequently, cause the self-assembly morphology to evolve step by step from micelles to vesicles and finally to fibrils. The fibrils can form complexes with SWNTs to increase solubility in THF. The effective fluorescence quenching accompanied also opens a gate for the block co-oligomer to have potential applications in organic electronic devices.
研究领域:
材料科学
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化学
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DOI
高影响因子
Soft Matter
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2011
·Vol. 7
·期 18
·8516-8524
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IF 4.457
Wei Xiong,Hanfu Wang,Yanchun Han
The synthesis and characterization of oligoaniline-containing dendron-rod-dendron dumbbell shape block oligomer (14G3A7) are presented. The unusual surface morphological evolution from fibrils to flat single-layer film and to a porous network is observed for 14G3A7 simply by oxidizing the block oligomer in solution. Based on the analysis of cryo-TEM as well as comparative studies on solution concentration and substrate properties, the series of changes in the surface morphology are explained through aniline conformational transition during oxidation. The network self-assembled from oxidized 14G3A7 contains a two dimensional close packing skeleton of aniline segment, which may find a wide range of applications in electronic sensitive devices.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Yuwei Ye,Zhiyong Liu,Wei Liu,Dawei Zhang,Haichao Zhao,Liping Wang,Xiaogang Li
This paper provided a novel coating system for Q235 steel using electrodeposited oligoaniline modified silica coating (E-M-SiO 2 ) as a pre-process coating, which was prepared by one step coelectrodeposition of a mixture of tetraethyl orthosilicate (TEOS) and N,N′-Bis(4′-(3-triethoxysilylpropylureido)-phenyl)-1,4-quinonenediimine (TSUPQD). Microstructure, contact angle, electroactivity and anticorrosion performance were investigated by FTIR, UV–vis, AFM, SEM, OCA20 contact angle analyzer, CV and CHI-660E electrochemical workstation. The CA test indicated, in comparison with pure silica and sol–gel modified silica hybrid coatings, the electrodeposited modified silica coating exhibited a super hydrophobic performance. The CV test illustrated that the special redox property of aniline trimer was maintained in these modified silica hybrid coatings. More importantly, the anticorrosion effectiveness for Q235 steel in 3.5% NaCl solution was improved by the addition of oligoaniline modified silica as the pre-process coating. By comparison, it turned out that the epoxy/E-M-SiO 2 coating system presented the lowest i corr value and the highest |Z| 0.01Hz value. The corrosion protection mechanism was the synergistic effect of super hydrophobic nature of E-M-SiO 2 pre-process coating and special catalytic capability of aniline trimer unit, which effectively restrained the permeation of corrosion medium and induced the formation of passive films consisted of α-Fe 2 O 3 and Fe 3 O 4 on the Q235 surface.
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
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 19
·8138-8147
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IF 3.288
Yanyan Wang,Xiaoteng Jia,Meihua Zhu,Xincai Liu,Danming Chao
With the rise of portable and wearable electronic devices, it is becoming increasingly important to develop energy storage devices that can display their working status. In this article, an electrochromic supercapacitor was developed based on electroactive tetraaniline-sulfanilic acid polysiloxane (TASA) and versatile Prussian blue (PB). The electrode was prepared through electrochemistry-assisted hydrolytic crosslinking reaction coupled with electrochemical deposition. The as-synthesized electrochromic TASA/PB electrodes exhibit high electrochromic performances with high optical contrast, acceptable coloration efficiency of 92.7 cm2 C−1, and good switching durability. It also exhibits specific capacitances as high as 273.4 F g−1 at the current density of 0.25 A g−1. The charge storage level (charged/discharged state) of the electrochromic supercapacitor based on TASA/PB electrode switches from green to blue, demonstrating the potential applications in energy storage and electrochromism for smart windows.
研究领域:
材料科学
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电化学
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能源存储
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DOI
高影响因子
ELECTROCHIMICA ACTA
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2020
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IF 6.215
Apparao Thota,Qiguan Wang,Pan Liu,Zengyun Jian
Carbon-based nanomaterials have been regarded as an important kind of electrode material for supercapacitors , but suffered from their low energy densities. To achieve high electrochemical performance, here a novel graphene/oligomer polyaniline composite is proposed. We prepare tetraaniline/reduced graphene oxide (RGO) (TAG-2) hybrid nanocomposite from N phenyl-p-phenylenediamine and graphene oxide in acidic media. Based on the high specific surface area, the as-synthesized TAG-2 hybrid composite can be used as a supporting substrate to synthesize Pt nanocatalyst for the methanol oxidation reaction in aqueous media. The TAG-2 hybrid composite and Pt/TAG-2 nanocatalyst are characterized by FT–IR, UV–vis absorption spectroscopy, XRD, XPS , SEM, EDX, TEM , conductivity, and cyclic voltammetry . The electrochemical properties of the TAG-2, tetraaniline (TANI), and RGO materials are thoroughly investigated by using cyclic voltammetry (CV) and charging-discharging techniques in 2 M H 2 SO 4 electrolyte solution . TANI and RGO show specific capacitance around 547 F/g and 213.5 F/g @1 A/g, respectively, while the achieved TAG-2 composite shows higher specific capacitance (958.2 F/g @0.1 A/g and 825.5 F/g @1 A/g) and superior rate capability than TANI and RGO. Based on the higher surface area and excellent penetration of ion electrolyte in TAG-2, the Pt/TAG-2 nanocatalyst shows better catalytic activity than commercial Pt/C towards methanol oxidation.
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
EUROPEAN POLYMER JOURNAL
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2020
·
IF 3.862
Yanyan Wang,Xiaoteng Jia,Erik B. Berda,Jiaxin Zhao,Xincai Liu,Danming Chao
Multicolor electrochromic polymers have attracted great attention and interest owing to their potential applications in multicolor displays, intelligent electronic devices, and smart visualized sensors. Herein, we prepared new electrochromic polysiloxanes by chemically coupling oligoaniline groups with cathodically colouring viologen and/or anodically colouring phenothiazine groups, respectively. Due to the combined effect and synergistic effect of paired anodically colouring oligoaniline and cathodically colouring viologen, the resulting polysiloxane exhibits multicolor electrochromic behavior switching from purple to transparent grey, to light green, finally to blue. As the oligoaniline units coupled with anodically colouring phenothiazine groups, the resultant polysiloxane also demonstrates multicolor electrochromic behavior changing from transparent grey to light green, to gray-blue, to brown and finally black purple. Furthermore, good switching durability has also been revealed during the electrochromic measurements, because of their robust network molecular structure and covalent bonding to the substrate.
研究领域:
材料科学
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化学工程
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显示技术
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DOI
高影响因子
SYNTHETIC METALS
·
2017
·
IF 2.435
Yuwei Ye,Dawei Zhang,Zhiyong Liu,Wei Liu,Haichao Zhao,Liping Wang,Xiaogang Li
Novel electroactive silica-based hybrid coatings were synthesized on the surface of Q235 low carbon steel via one-step electrodeposition and were analyzed by FTIR, UV-vis, SEM, OCA20 contact angle (CA) analyzer and CHI-660E electrochemical workstation, respectively. The CA test indicated, in comparison with bare Q235 substrate, the silica hybrid material modified by N, N'-Bis(4′-(3-triethoxysilylpropylureido)-phenyl)-1,4- quinonenediimine (TSUPQD) exhibited an excellent hydrophobic properties. More importantly, the deposition potential significantly affected the corrosion resistance of TSUPQD modified silica hybrid material. By comparing with various deposition potentials (−1.1, −1.3, −1.5, −1.7 V) under the deposition time of 500 s, the coating prepared under the potential of −1.5 V presented the best anti-corrosion performance for Q235 steel in 3.5 wt.% NaCl solution. The XRD and SEM analysis of corrosion product beneath the hybrid coatings showed that the redox catalytic capability of aniline trimer unit induced the Q235 substrate to form the passive films which mainly consisted of α-Fe 2 O 3 and Fe 3 O 4 .
研究领域:
材料科学
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电化学
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表面工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Hao Lu,Shengtao Zhang,Weihua Li,Yanan Cui,Tao Yang
As a vital derivative of graphene, graphene oxide (GO) is widely applied in various fields, such as transparent electrodes, solar cells, energy storage, and corrosion protection due to the large specific surface area and abundant active sites. However, compared with graphene, the application of GO has been less reported in metal corrosion protection field. Therefore, in our study, 3-aminobenzenesulfonic acid was selected to combine with oligoanilines to fabricate the GO-based sulfonated oligoanilines coatings for marine corrosion protection application. The obtained composite coatings were covered on the surface of Q235 steel, which is one of the most important structural marine materials. Fourier transform infrared spectra were utilized to prove the existence of different bonds and functional groups of aniline trimer and sulfonated aniline trimer (SAT). Scanning electron microscopy was applied to verify the combination of GO and SAT. What’s more, transmission electron microscopy was applied to observe the surface appearance of the obtained GO–SAT composite material. Besides, the results of electrochemical measurements performed in 3.5 wt % NaCl solution showed excellent corrosion-protective properties of GO/SAT-coated epoxy resin with a dosage of 10 mg of GO compared with the pure epoxy resin. Moreover, the enhancement of surface hydrophobic property, to some extent, is in favor of preventing the absorption of corrosive medium and water molecules revealed by contact angle test. The addition of GO can make the diffusion pathway of the corrosive medium longer and more circuitous, while SAT has displayed excellent solvent solubility while maintaining corrosion-protective properties similar to those of polyanilines so that the corrosion-protective properties of the modified coatings improve significantly due to the synergistically enhanced corrosion protection of GO and SAT.
研究领域:
材料科学
·
腐蚀与防护
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DOI
高影响因子
Journal of Functional Biomaterials
·
2023
·Vol. 14
·期 4
·185
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IF 4.8
Yinglong Zhang,Jiajing Tang,Wei Fang,Qing Zhao,Xiaoyu Lei,Jinzheng Zhang,Jieqiong Chen,Yubao Li,Yi Zuo
Processibility and biodegradability of conductive polymers are major concerns when they are applied to tissue regeneration. This study synthesizes dissolvable and conductive aniline trimer-based polyurethane copolymers (DCPU) and processes them into scaffolds by using electrospinning with different patterns (random, oriented, and latticed). The effects of topographic cue changes on electrical signal transmission and further regulation of cell behaviors concerning bone tissue are researched. Results show that DCPU fibrous scaffolds possessed good hydrophilicity, swelling capacity, elasticity, and fast biodegradability in enzymatic liquid. In addition, the conductivity and efficiency of electrical signal transmission can be tuned by changing the surface’s topological structure. Among them, oriented DCPU scaffolds (DCPU-O) showed the best conductivity with the lowest ionic resistance value. Furthermore, the viability and proliferation results of bone mesenchymal stem cells (BMSCs) demonstrate a significant increase on three DCPU scaffolds compared to AT-free scaffolds (DPU-R). Especially, DCPU-O scaffolds exhibit superior abilities to promote cell proliferation because of their unique surface topography and excellent electroactivity. Concurrently, the DCPU-O scaffolds can synergistically promote osteogenic differentiation in terms of osteogenic differentiation and gene expression levels when combined with electrical stimulation. Together, these results suggest a promising use of DCPU-O fibrous scaffolds in the application of tissue regeneration.Keywords:oligoaniline;conductive polyurethane;fibrous scaffolds;electrical and topographical cues;tissue regeneration
研究领域:
材料科学
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生物医学工程
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组织工程
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）