EUROPEAN POLYMER JOURNAL
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2019
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IF 3.621
Jinze Wang,Lin Liu,Jie Chen,Mingxiao Deng,Xiagru Feng,Li Chen
In clinical cancer treatment, the combination therapy as new therapeutic strategy has attracted more concerns to feature stronger anticancer efficacy and fewer side effects. Herein, a kind of cationic nanoplatform was fabricated to co-deliver gene and photosensitizer based on the supramolecular interaction between β-cyclodextrin (β-CD) and tetraphenylporphyrin (TPP), in which cationic poly (L-lysine) as genes delivery was modified by β-cyclodextrin (β-CD-PLL) and PEGylated TPP was used as water soluble photosensitizer (TPP-PEG). The structures of β-CD-PLL and TPP-PEG were characterized by 1 H NMR. The host-guest recognition between β-CD-PLL and TPP-PEG was verified by DLS and TEM. In vitro data indicated that this platform showed high DNA transfection efficiency and photodynamic effect for the combination of genetic and photodynamic therapy.
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高影响因子
ELECTROCHIMICA ACTA
·
2019
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IF 5.383
Xing Yang,Yunrui Tian,Shatila Sarwar,Miaomiao Zhang,Huaiping Zhang,Jujie Luo,Xinyu Zhang
Two nanocompisitees with different morphologies of polypyrrole nanofibers/cobalt oxide (PPyNF/CoO x ) and polypyrrole nanotubes/cobalt oxide (PPyNT/CoO x ) were successfully prepared via a rapid and cost-efficient microwave approach. The micromorphology, surface chemical and crystalline structure of the resultant samples were characterized by FT-IR, XRD , SEM and XPS . Besides, electrochemical performances of the as-produced nanocompisitees with different mass ratio, microwave powers and times were further investigated as a battery-type electrode materials for supercapacitors . It was found that the maximum capacitance of PPyNF/CoO x could reached up to 270C g −1 at 1 A g −1 , as well as with good cycling stability (almost nothing capacitance loss after 1000 cycles). Compared to PPyNF/CoO x , PPyNT/CoO x , showed a lower specific capacitance of 167.5C g −1 at the same current density. Surprisingly, the specific capacitance of PPyNT/CoO x could be further increased by 166% (278.4C g −1 at 1 A g −1 ) after 1200 cycles, and the cycling stability with nearly 105% of the initial capacitance could be achieved after 4000 cycles. Moreover, the asymmetric supercapacitor device based on the PPyNF/CoO x //active carbon showed a maximum gravimetric energy density of 24.22 Wh kg −1 and power density of 6.8 kW kg −1 , testifying its enormous potential for energy storage devices.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2019
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IF 3.47
Ziguo Yuan,Xin Zhang,Qian Yao,Ying Zhang,Yao Fu
In this study, a series of catalysts including different metal oxides loading on HZSM-5(Si/Al = 25) and cobalt oxides loading on different supports were synthesized to catalyze fast pyrolysis (CFP) of biomass derived polylactic acid (PLA) to produce acetonitrile under ammonia atmosphere. Both the metal and the acid of the catalyst had a crucial influence on the yield of acetonitrile and Co/HZSM-5(25) produced most acetonitrile. Other factors that might affect the product distribution including cobalt loading, reaction temperature, resident time and NH 3 flow rate have been investigated systematically. Under the optimized CFP condition (650 ℃; resident time 2.4 s; NH 3 flow rate 80 ml/min), the carbon yield and selectivity of acetonitrile in liquid product reached 50.2% and 83.6%, respectively. The possible reaction pathway from PLA to acetonitrile was also studied and proposed. PLA firstly cracked into lactic acid through thermal decomposition and formed lactide at the same time. Then lactic acid and lactide cracked into low-molecular aldehydes, ketones and acids. These aldehydes and ketones reacted with ammonia to form imines, acids to amides, and finally to acetonitrile and small amount of proponitrile under the catalysis of Co/HZSM-5 catalyst.
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POLYMER BULLETIN
·
2019
·Vol. 77
·期 2
·1049-1066
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IF 1.858
Zhang Mengmeng,Yu Zehao,Yu Hongchao
Ferroferric oxide/polypyrrole (Fe 3 O 4 /PPy) composites were prepared by an in situ polymerization method. Several analysis techniques including X-ray diffraction, Fourier transform infrared spectra, thermogravimetric analysis and scanning electron microscopy are applied to analyze the structure and morphology of Fe 3 O 4 /PPy. The magnetic Fe 3 O 4 /PPy was further used as an adsorbent for removing Eosin Y, methyl orange and brilliant green from aqueous phase. The adsorption kinetics were investigated by pseudo-first-order, pseudo-second-order and intraparticle diffusion models, and the experimental data were well fitted to the pseudo-second order. The equilibrium adsorption data can be described by both the Langmuir and Freundlich isotherm models. The calculated Langmuir maximum adsorption capacities of Eosin Y, methyl orange and brilliant green at 25 °C are 212.31, 149.48 and 263.85 mg/g, respectively. Thermodynamic studies indicated that the adsorption process occurred spontaneously, in an endothermic and physisorption nature, and with increased disorder. Furthermore, the convenient magnetic separability of Fe 3 O 4 /PPy makes it a good candidate for practical application in the removal of organic dyes from polluted water.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Lu Huang,Tao Zeng,Xuyang Xu,Zhiqiao He,Jianmeng Chen,Shuang Song
Immobilized activators of persulfate (PS) with high activity and stability are highly desirable from an industrial and environmental point of view. In this work, nitrogen-doped carbon (CNx) was successfully hybridized with stainless steel (SS) derived Fe 3 O 4 to construct a SS supported CNx/Fe 3 O 4 heterogeneous catalyst (CNx/Fe 3 O 4 /SS). When used in a sulfate radical (SO 4 − )-based advanced oxidation process (SR-AOP), CNx/Fe 3 O 4 /SS displayed significantly higher activity towards the degradation of aqueous carbamazepine (CBZ) when compared to the single Fe 3 O 4 and CNx activators. The removal of CBZ had the most rapid progression, with an initial pH of 3.5, a temperature of 35 °C, an initially added PS concentration of 250 mg L −1 and an added amount of CNx/Fe 3 O 4 /SS of 0.30 g. The removal efficiency of CBZ was ∼100% after 35 min of SR-AOPs. In addition, the CNx/Fe 3 O 4 /SS catalyst was stable, as demonstrated by six successive cycling experiments. The results obtained from the electron paramagnetic resonance (EPR) spectra and radical quenching experiments indicated that both SO 4 − and HO contributed to the CBZ oxidation process. On the basis of X-ray photoelectron spectroscopy (XPS) and Fermi level analyses, it can be concluded that SO 4 − and HO originated from the Fe 3 O 4 catalyzed decomposition of aqueous PS. CNx facilitated the redox cycle of Fe(III)/Fe(II) in Fe 3 O 4 . This study demonstrated the potential application of SR-AOPs to efficiently degrade organic contaminants.
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高影响因子
RSC Advances
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2019
·Vol. 9
·期 22
·12667-12674
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IF 3.049
Mo Zhu,Ying Hao,Xun Ma,Lin Feng,Yuanxin Zhai,Yaping Ding,Guosheng Cheng
A new class of stimuli responsive drug delivery systems is emerging to establish new paradigms for enhancing therapeutic efficacy. To date, most electro-responsive systems rely on noble metal electrodes that likely cause the limitations for implantation applications. Herein, a graphene/polypyrrole composite electrode (GN–PPy–FL) was fabricated based on two-dimensional (2D) graphene (GN) film and conductive and biocompatible polypyrrole (PPy) nanoparticles loaded with a negative drug model of fluorescein sodium (FL) via chemical oxidation polymerization. The conductive composite electrode was utilized as a drug carrier to realize the electrically controlled release of the FL. The release rate from conductive nanoparticles can be controlled by the applied voltages. The study provides a multi-stimuli responsive drug release system, demonstrating the potential applications of the controlled release of various drugs, peptides or proteins.
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PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2019
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IF 3.074
Yang Yu,Yanwei Li,Yanhui Li,Hengguo Wang,Qinghui Zuo,Qian Duan
In this study, a novel 1D porphyrin-based polymer, polyphenylporphyrin benzobisoxazole, namely P(PPor-BBO), was synthesized via polycondensation between 5, 15-bis(4-carboxyphenyl)-10, 20-diphenylporphyrin and 4,6-diaminoresor-cinol dihydrochloride. The P(PPor-BBO) is a 1D fully-conjugated heterocyclic aromatic polymer with co-linear and co-planar rigid backbone. Extended fully π-conjugated systems not only enhance chemical stability and lead to insolubility, but also improve photocatalytic active units and light-harvesting capability in the visible-light region . As a result, P(PPor-BBO) shows excellent photocatalytic performance for rhodamine B degradation (150 min, 98%) under visible-light irradiation. It also exhibits easy recyclability and sustainability, indicating it could be as environmentally-friendly catalyst for organic dye wastewater treatment.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 23
·14309-14319
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IF 3.442
Zhou Zekun,Shao Yun,Gao Xiang,Liu Zhitian,Zhang Qi
Nanostructures of polypyrrole with controlled uniform morphologies have been synthesized using assembled surfactant aggregates as templates. The effects of hydrophobic chain length of surfactant on particle size and electrochemical performance of polypyrrole nanospheres are systematically studied. The particle size and morphology of the nanospheres are observed by scanning electron microscope and transmission electron microscope, and at the same time, the nitrogen adsorption and desorption test of polypyrrole spheres are carried out. The results show that changing the length of hydrophobic chain of surfactant is not only an effective control of particle size and morphology, but also a significant improvement on the pore structure. With the increase in alkyl chain length, the particle size decreases, and the specific surface area and pore volume increase. The polypyrrole nanosphere prepared by long hydrophobic chain surfactant shows small impedance and high electrochemical capacity about 232 F g −1 at 1.0 A g −1 , and the results suggest that we can fabricate high specific surface area polypyrrole nanosphere which has excellent electrochemical performance by the regulation of hydrophobic chain length. Our work provides a novel synthetic strategy for the fabrication of nanospheres for the construction of high-performance supercapacitors by optimizing the hydrophobic chain length.
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JOURNAL OF POLYMER RESEARCH
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2019
·Vol. 26
·期 9
·1-11
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IF 1.53
Xiong Xiaopeng,Huo Peng,Xie Haitao
A free-standing Ni 3 S 2 @polypyrrole core-shell nanorod arrays have been successfully prepared and been directly used as supercapacitor. First, needle-like Ni 3 S 2 nanorods array was grown on Ni foam through a hydrothermal process, and was then electrochemically deposited with polypyrrole (PPy) layer. The composition, microstructure, and morphology of the obtained composite material have been studied by attenuated total reflection Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscope. Our results indicate that the needle-like Ni 3 S 2 nanorods with diameter about 200 nm and 3 μm in length have grown evenly on Ni foam, and the thickness of the coated PPy layer can be tuned by the electrodeposition time. The electrochemical properties of the obtained free-standing Ni 3 S 2 /Ni@PPy composite foam have been evaluated by a three-electrode system. Our results reveal that the composite foam with the PPy shell layer about 300 nm in thickness displays the best performance, and the area specific capacitance was measured to be over 5 times that of the Ni 3 S 2 /Ni foam to reach 55.4 mF/cm 2 . The improvement has been attributed to the unique hierarchical core-shell microstructure and to the proper amount of PPy deposition. Moreover, the electrochemical stability of the material has been checked to indicate its potential as high-performance supercapacitors.
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高影响因子
PROGRESS IN ORGANIC COATINGS
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2019
·
IF 3.42
Yuhua Dong,Ming Gong,Dong Huang,Jie Gao,Qiong Zhou
Raspberry-like polydopamine@polypyrrole nanoparticles were synthesized by in situ chemical oxidative polymerization. Morphology was observed by scanning electron microscopy, and photothermal conversion performance was investigated. A shape memory coating with self-healing ability was prepared based on a thermo-responsive shape memory epoxy resin that utilized polydopamine@polypyrrole nanoparticles as the photothermal agent. Damage to the coating was healed via 808 nm near infrared light. The healing performance was evaluated by comparing the macroscopic morphologies of the scratched and healed coatings via optical microscopy. Linear sweep voltammetry was used to assess the recovery of the coating’s barrier properties. The results confirmed that the coating had self-healing ability based on the photothermal conversion effect of the polydopamine@polypyrrole nanoparticles.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Mingzhu Yu,Lina Wu,Jiaona Miao,Wei Wei,Anran Liu,Songqin Liu
We developed a new electrochemical sensor based on TiO 2 and polypyrrole (PPy) molecularly imprinted polymer (MIP) nanocomposites for the high selective detection of p-nonylphenol in food samples, which is considered as a kind of endocrine disrupting chemical and harmful to human health. With p-nonylphenol as template molecules, the molecularly imprinted polymer was synthesized by the chemical oxidative polymerization of pyrrole and deposited on the surface of TiO 2 nanoparticles to form partially encapsulated PPy@TiO 2 nanocomposites, denoted as NP-PPy@TiO 2 MIP. p-Nonylphenol was bound in the PPy matrix through hydrogen bond and π-π interaction between p-nonylphenol and PPy skeleton. NP-PPy@TiO 2 MIP nanocomposites were modified onto glassy carbon electrode (GCE) and p-nonylphenol molecules were excluded from PPy layers by potentiostatic sweeping at the potential of 1.3 V. The as-prepared electrochemical sensor obtained a large amount of micro cavities in PPy layer which could specially recognize and combine target molecules p-nonylphenol. After special adsorption of p-nonylphenol from samples, p-nonylphenol embedded in the PPy layer exhibited a strong differential pulse voltammetry (DPV) response at 0.56 V, which can be used for the detection of p-nonylphenol with a linearly proportional concentration range of 1.0 × 10 −8 to 8 × 10 −5 mol/L and a detection limit of 3.91 × 10 −9 mol/L. The good stability, reproducibility and specificity of the resulting MIP electrochemical sensor are demonstrated. It might open a new window for investigation of selectively electrochemical sensing of small organic molecules from their analogues with the molecular imprinting technique.
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PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Ying Sun,Shuhang Ren,Yucui Hou,Kai Zhang,Weize Wu
In this work, we demonstrate an innovative strategy for efficient and sustainable absorption of NO in a series of ionic liquids (ILs) containing amine groups and azole groups. The results show that the ILs have low viscosities and high performance for NO absorption. For instance, [TEPA][Im] had a high absorption capacity of 6.79 mol NO per mol IL at 30 °C and ambient pressure. The absorbed NO was easily released by heat treatment, and the regenerated IL had significant reversibility. The results of 1H NMR, UV spectra, and FT-IR spectra of ILs before and after NO absorption indicated that the absorption of NO in the [TEPA][Im] mainly resulted from a chemical interaction. NO interacts with not only the secondary amine groups in the cation but also N-imidazole in the anion through the formation of NONOate, indicating [TEPA][Im] is a dual functional IL. By introducing this efficient and reversible absorption of NO by ILs, our work broadens the method of NO capture.
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危险品化学品经营许可证（带存储）