APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Shaoqiang Cao,Hongyang Zhang,Yuanqing Song,Jianling Zhang,Haigang Yang,Long Jiang,Yi Dan
Polypyrrole/polyvinyl alcohol–titanium dioxide (PPy/PVA–TiO 2 ) composite films used as photo-catalysts were fabricated by combining TiO 2 sol with PPy/PVA solution in which PPy was synthesized by in situ polymerization of pyrrole (Py) in polyvinyl alcohol (PVA) matrix and loaded on glass. The prepared photo-catalysts were investigated by X-ray diffraction (XRD), ultraviolet–visible diffuse reflection spectroscopy (UV–vis DRS), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectra and photoluminescence (PL). The results indicate that the composites have same crystal structure as the TiO 2 and extend the optic absorption from UV region to visible light region. By detecting the variation ratio, detected by ultraviolet–vis spectroscopy, of model pollutant rhodamine B (RhB) solution in the presence of the composite films under both UV and visible light irradiation, the photo-catalytic performance of the composite films was investigated. The results show that the PPy/PVA–TiO 2 composite films show better photo-catalytic properties than TiO 2 film both under UV and visible light irradiation, and the photo-catalytic degradation of RhB follows the first-order kinetics. The effects of the composition of composite films and the concentration of RhB on the photo-catalytic performance, as well as the possible photo-catalytic mechanism, were also discussed. By photo-catalytic recycle experiments, the structure stability of the PPy/PVA–TiO 2 composite film was investigated and the results show that the photo-catalytic activity under both UV and visible light irradiation have no significant decrease after four times of recycle experiments, suggesting that the photo-catalyst film is stable during the photo-catalytic process, which was also confirmed by the XRD pattern and FT-IR spectra of the composite film before and after photo-catalytic.
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ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Wantao Liu,Yanyan Fang,Peng Xu,Yuan Lin,Xiong Yin,Guangshi Tang,Meng He
Polypyrrole/reduced graphene oxide (PPy/RGO) composites on the rigid and plastic conducting substrates were fabricated via a facile two-step electrochemical process at low temperature. The polypyrrole/graphene oxide (PPy/GO) composites were first prepared on the substrate with electrochemical polymerization method, and the PPy/RGO composites were subsequently obtained by electrochemically reducing the PPy/GO. The resultant PPy/GO and PPy/RGO composites were porous, in contrast to the dense and flat pristine PPy films. The cyclic voltammetry measurement revealed that resultant composites exhibited a superior catalytic performance for triiodide reduction in the order of PPy/RGO > PPy/GO > PPy. The catalytic activity of PPy/RGO was comparable to that of Pt counter electrode (CE). Under the optimal conditions, an energy conversion efficiency of 6.45% was obtained for a rigid PPy/RGO-based dye-sensitized solar cell, which is 90% of that for a thermally deposited Pt-based device (7.14%). A plastic counter electrode was fabricated by depositing PPy/RGO composites on the plastic ITO/PEN substrate, and then an all-plastic device was assembled and exhibited an energy conversion efficiency of 4.25%, comparable to that of the counterpart using a sputtered-Pt CE (4.83%) on a plastic substrate. These results demonstrated that electrochemical synthesis is a facile low-temperature method to fabricate high-performance RGO/polymer composite-based CEs for plastic DSCs.
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高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Xuemei Yao,Li Chen,Xiaofei Chen,Zhe Zhang,Hui Zheng,Chaoliang He,Jingping Zhang,Xuesi Chen
For drug delivery systems, the most important factors are biocompatibility and stability. To achieve excellent biocompatibility, learning from naturally occurring systems may be the best choice. Herein, a series of pH-sensitive metallo-supramolecular nanogels (MSNs) were prepared by the metallo-supramolecular coordinated interaction between histidine and iron-meso-tetraphenylporphin, which mimicks the way that hemoglobin carries oxygen. With the excellent biocompatibility and special supramolecular pH sensitivity, MSNs had been exploited to load and release anticancer drug doxorubicin (DOX). In vitro drug release profiles showed that only a small amount of the loaded DOX was released in PBS solution at pH 7.4, while up to about 80% of the loaded DOX could be quickly released at pH 5.3 due to the pH-dependent disassembly of MSNs. Confocal laser scanning microscopy (CLSM) and flow cytometry were used to verify the cellular uptake and intracellular drug release behaviors of DOX-loaded MSNs toward MCF-7. Efficient cellular proliferation inhibition against MCF-7 and HeLa cells was also observed by a 3-(4,5-dimethyl-thiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay. These features suggested that MSNs could be of great potential as intelligent drug delivery systems.
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EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2014
·Vol. 238
·期 5
·889-894
·
IF 1.387
Zhu Jinghui,Li Chunyan,Liu Shaopu,Liu Zhongfang,Yang Jidong,Tian Jing,Hu Xiaoli
A non-diazotization-coupling reaction-based colorimetric method was developed and validated for the determination of nitrite in tap water and milk samples. Under acidic condition, nitrite could selectively react with pyrrole, resulting in the emerging of a new absorption peak at 509 nm and a distinct color change from clear to red, with which the concentration of nitrite can be determined indirectly. Excellent linear range was achieved from 0.72 to 40.0 μmol L −1 with a detection limit of 0.22 μmol L −1 . The detection limit was lower than or comparable to most of the recently published methods. The experimental conditions were optimized, and effects of coexisting substances were evaluated, and the results showed excellent priority since a certain amount of other anions, including SO 3
− , SeO 3
− and other acid radicals, would not interfere with the measurement. We highlighted the simplicity and efficiency of this method as no diazotization-coupling procedure and toxic aniline were involved. Determination of nitrite in tap water and milk samples was performed.
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ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Lihuan Xu,Fang Yang,Chang Su,Lvlv Ji,Cheng Zhang
Two 2,2,6,6-tetramethylpiperidinyl-N-oxy (TEMPO) contained polypyrrole (PPy) derivatives with the different side-chain length were synthesized by esterification of 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl free radial with pyrrole butyric acid and pyrrole caproic acid. Then the homopolymers of 4-(3-(Pyrrol-1-yl)butyryloxy)-2,2,6,6-tetramethylpiperidin-1-yloxy (PPy-B-TEMPO) and 4-(3-(Pyrrol-1-yl)hexanoyloxy)-2,2,6,6-tetramethylpiperidin-1-yloxy (PPy-C-TEMPO) were prepared by chemical oxidative polymerization. The structure, morphology, electrochemical properties of prepared polymers were characterized by fourier transform infrared spectroscopy (FTIR), ultraviolet visible spectroscopy (UV-vis), scanning electron microscopy (SEM), cyclic voltammograms (CV) and electrochemical impedance spectra (EIS), respectively. Also, the charge-discharge properties of the prepared polymers were studied by galvanostatic charge-discharge testing. The results demonstrated that the as-synthesized nitroxide radical polymers showed a reversible two-electron redox reaction process in the potential limits of 2.5–3.0 V and 3.4–3.8 V vs Li/Li + , respectively. Under our experimental conditions, PPy only presented the discharge capacity of 16.5 mAh·g −1 at 20 mA·g −1 between 2.5 and 4.2 V, while PPy-B-TEMPO with the short side-chain linked to TEMPO groups exhibited an initial discharge capacity of up to 86.5 mAh·g −1 with two well-defined plateaus. Furthermore, the PPy-C-TEMPO with the longer linking side-chain even displayed a discharge capacity of 115 mAh·g −1 . These superior electrochemical performances were ascribed to the flexible linking side-chain and the introduction of stable conductive PPy main chain, which benefits the improvement of charge carrier transportation in the aggregated polymer bulk.
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ANALYST
·
2013
·Vol. 138
·期 20
·5949-5955
·
IF 3.969
Min Cui,Su Liu,Wenjing Lian,Jie Li,Wei Xu,Jiadong Huang
In this study, we developed a novel molecularly-imprinted electrochemical sensor based on a glassy carbon electrode (GCE) decorated by graphene–Prussian blue (GR–PB) composites for the selective and sensitive determination of butylated hydroxyanisole (BHA). The molecularly-imprinted polymers (MIPs) were synthesized by BHA and pyrrole as the template molecule and functional monomer, respectively. Also, the MIPs were assembled on the surface of the GR–PB/GCE by electropolymerization. The sensor was characterized by cyclic voltammetry (CV), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and chronoamperometry. It was confirmed that the synergistic effects of GR and PB could improve the electrochemical response and the sensitivity of the sensor. The linear range of the sensor was from 9 × 10−8 mol L−1 to 7 × 10−5 mol L−1, with a limit of detection (LOD) of 7.63 × 10−8 mol L−1 (S/N = 3). The proposed sensor displayed high selectivity, excellent stability and good reproducibility for the determination of BHA. It was successfully applied to the determination of BHA in real samples.
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Nanoscale
·
2013
·Vol. 5
·期 18
·8703-8710
·
IF 6.233
Fang Deng,Lujuan Min,Xubiao Luo,Shaolin Wu,Shenglian Luo
Conductive polypyrrole–polyaniline/TiO2 nanocomposites (PPy–PANI/TiO2) were prepared by in situ oxidative copolymerization of pyrrole and aniline monomers in the presence of TiO2. For comparison studies, polypyrrole/TiO2 (PPy/TiO2) and polyaniline/TiO2 (PANI/TiO2) were also prepared. The samples were characterized by X-ray diffraction, transmission electron microscopy, UV-vis diffuse reflectance spectroscopy, zeta potential analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis and photocurrent tests. In contrast to PPy/TiO2 and PANI/TiO2, PPy–PANI/TiO2 exhibits obvious absorption in the visible-light range, and is much superior to PPy/TiO2 and PANI/TiO2 in thermal stability. It is found that PPy–PANI/TiO2 performs well in the visible-light photocatalytic degradation of 4-nitrophenol. The optimized pyrrole : aniline : TiO2 molar ratio for best performance is 0.75 : 0.25 : 100. The efficacy of PPy–PANI/TiO2 is attributed to its conductivity, conjugated structure, as well as to the synergy amidst polypyrrole, polyaniline and TiO2.
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高影响因子
Nanoscale
·
2013
·Vol. 5
·期 19
·9150-9155
·
IF 6.233
Yi Sui,Jinghai Liu,Yuewei Zhang,Xike Tian,Wei Chen
Developing new methods to improve the photocatalytic activity of graphitic carbon nitride (g-C3N4) for hydrogen (H2) evolution has attracted intensive research interests. Here, we report that the g-C3N4 exhibits photocatalytic activity for H2 evolution from pure water. And, the activity is dramatically improved by loading highly dispersed conductive polymer nanoparticles. The H2 evolution rate increases up to 50 times for g-C3N4 with 1.5 wt% polypyrrole (PPy) nanoparticles on the surface. The reaction proceeding in a pure water system excludes the need for sacrificial agents. The role of the highly conductive PPy in enhancing H2 evolution is as a surface junction to increase the number of photoinduced electrons, and to facilitate electron transfer to the interface.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2014
·Vol. 20
·期 37
·11826-11834
·
IF 5.696
Yang Wang,Yun Xiao,Ruikang Tang
Graphical Undercover double agent : Spindle-like polypyrrole hollow nanocapsules (PPy HNCs) can load and deliver anticancer drugs with high efficiencies; meanwhile, the polypyrrole (PPy) shells are an excellent agent for organic photothermal therapy (see figure; DOX=doxorubicin). Two cancer therapy methods were successfully combined to significantly improve the effect of tumor therapy in vitro and in vivo. The monodispersed spindle-like polypyrrole hollow nanocapsules (PPy HNCs) as the multifunctional platforms for combining chemotherapy with photothermal therapy for cancer cells are reported. Whereas the hollow cavity of nanocapsules can be used to load the anticancer drug (i.e., doxorubicin) for chemotherapy, the PPy shells can convert NIR light into heat for photothermal therapy. The release of the drug from the spindle-like PPy HNCs is pH-sensitive and near-infrared (NIR) light-enhanced. More importantly, the spindle-like PPy HNCs can penetrate cells more rapidly and efficiently in comparison with the spherical PPy HNCs. Both in vitro and in vivo experiments demonstrated that the combination of DOX-loaded spindle-like PPy HNCs and NIR light provide a highly effective and feasible chemo-photothermal therapy cancer method with a synergistic effect. Owing to their high photothermal conversion efficiency, large hollow cavity, and good biocompatibility, the spindle-like PPy HNCs could be used as a promising new cancer drug-nanocarrier and photothermal agent for localized tumorous chemo-photothermal therapy.
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高影响因子
TETRAHEDRON
·
2014
·
IF 2.817
Junchao Xu,Leiming Zhu,Qiusheng Wang,Lintao Zeng,Xichao Hu,Boqiao Fu,Zhe Sun
A series of meso -C 6 F 5 BODIYs have been successfully synthesized and characterized. Some of them displayed excellent spectroscopic properties, such as relatively large Stokes shift , high fluorescence quantum yield , far-red or near infrared region (NIR) emission, and good photostability. In particular, the dye functionalized with oligo(ethylene glycol) ether-phenyl groups at the 3,5-position of BODIPY core became water-soluble and its emission located in the NIR region with large Stokes shift. Time-dependent density functional theory calculations were conducted to understand the structure–optical properties relationship. Furthermore, cell staining tests demonstrated that the meso -C 6 F 5 BODPY derivative with oligo(ethylene glycol) ether-phenyl group was membrane permeable and selectively stained cytosol in living cells.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2014
·Vol. 18
·期 10
·2743-2753
·
IF 2.234
Li Meng,Jiang Li-Qing,Lin Lin,Li Yong-Feng,Yu Ding-Ling,Cui Li-Li,He Xing-Quan
A novel high-performance non-noble metal electrocatalyst for the oxygen reduction reaction (ORR) was fabricated by anchoring cobalt tetraferrocenylporphyrin (CoFcP) onto poly(sodium- p -styrenesulfonate) modified graphene (PSS-Gr) through solvothermally assisted π–π assembling method. The morphology of the assembled composite was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The interactions between CoFcP moieties and graphene sheets were confirmed by UV–Vis absorption spectroscopy and X-ray photoelectron spectroscopy. The electrocatalytic properties of the CoFcP/PSS-Gr catalyst towards the oxygen reduction reaction were assessed using rotating disk electrode (RDE) and rotating ring-disk electrode (RRDE) measurements in both alkaline and acidic media. In addition, cyclic voltammetry and chronoamperometric measurements were utilized to evaluate the catalytic activity and stability of the CoFcP/PSS-Gr composite in alkaline solution. The results showed that CoFcP supported on graphene exhibited an outstanding electrocatalytic performance towards the ORR comparable with commercial Pt/C catalyst in alkaline media, such as high onset potential (0.889 V vs. reversible hydrogen electrode, RHE), half wave potential (0.789 V vs. RHE), better tolerance to methanol, excellent stability (84.1 %, retention after 10000 s), and efficient four-electron pathway. Moreover, the proposed hybrid presented excellent catalytic activity in terms of onset potential (0.72 V vs. RHE) and high-electron transfer number compared with Pt/C in acidic media.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2014
·
IF 2.045
Jun Chen,Xiaoqin Hong,Qingdong Xie,Diankai Li,Qianfeng Zhang
Polypyrrole-sepiolite nanofibers were prepared by in situ chemical oxidation polymerization in the presence of sepiolite. The nanostructure of PPy-sepiolite nanofibers was confirmed by field-emission scanning electron microscopy. The adsorption of Cr(VI) onto the PPy-sepiolite nanofibers was highly pH dependent and the adsorption kinetics followed the pseudo-second-order model. The Langmuir isothermal model well described the adsorption isotherm data and the maximum adsorption capacity increased with the increase of temperature. The maximum adsorption capacity of the PPy-sepiolite nanofibers for Cr(VI) was up to 302 mg·g–1 at 25 °C. Thermodynamic investigation indicated that the adsorption process is spontaneous and endothermic. Desorption experiment showed PPy-sepiolite can be regenerated and reused for four consecutive cycles without obvious loss of its removal efficiency. The excellent adsorption characteristic of PPy-sepiolite will render it a highly efficient and economically viable adsorbent for Cr(VI) removal.
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