ACS Applied Materials & Interfaces
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2018
·
IF 8.097
Zhen Hu,Fei Lu,Yingying Liu,Lei Zhao,Long Yu,Xirong Xu,Weihao Yuan,Qian Zhang,Yudong Huang
A metal–organic framework (MOF)-mediated adsorption strategy is first developed for improving the anti-ultraviolet (UV) properties of poly(p-phenylene benzobisoxazole) (PBO) fibers. In this work, UIO-66 was successfully anchored onto the surface of PBO fibers by one-step microwave-assisted heating method. The experimental results showed an obviously enhanced surface energy (91.1%), roughness (268.4%), interfacial shear strength (49.0%), and anti-UV properties (66.7%) compared to pristine PBO fibers. The anti-UV dye (tartrazine) was further immobilized onto the surface of PBO fibers via an adsorption strategy mediated by UIO-66. Interestingly, the PBO@tartrazine fibers demonstrated superior anti-UV performance (further up to 81.5%) compared to PBO@UIO-66 fibers. The extraordinary anti-UV properties of PBO@tartrazine fibers could be rationally ascribed to the synergistic effects of UIO-66 and tartrazine molecules. Considering the diversities and functionalities of MOFs and targeted materials, our work indicates that the MOF-mediated adsorption strategy would promisingly endow PBO fibers with other desired performance and applications such as solar–thermal transition and self-healing abilities.
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高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2019
·Vol. 57
·期 12
·1333-1343
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IF 2.591
Cong Hu,Bingyang Dong,Li Liu
We report on the preparation of reduction-responsive amphiphilic block copolymers containing pendent p -nitrobenzyl carbamate ( p NBC)-caged primary amine moieties by reversible addition–fragmentation chain transfer (RAFT) radical polymerization using a poly(ethylene glycol)-based macro-RAFT agent. The block copolymers self-assembled to form micelles or vesicles in water, depending on the length of hydrophobic block. Triggered by a chemical reductant, sodium dithionite, the p NBC moieties decomposed through a cascade 1,6-elimination and decarboxylation reactions to liberate primary amine groups of the linkages, resulting in the disruption of the assemblies. The reduction sensitivity of assemblies was affected by the length of hydrophobic block and the structure of amino acid-derived linkers. Using hydrophobic dye Nile red (NR) as a model drug, the polymeric assemblies were used as nanocarriers to evaluate the potential for drug delivery. The NR-loaded nanoparticles demonstrated a reduction-triggered release profile. Moreover, the liberation of amine groups converted the reduction-responsive polymer into a pH-sensitive polymer with which an accelerated release of NR was observed by simultaneous application of reduction and pH triggers. It is expected that these reduction-responsive block copolymers can offer a new platform for intracellular drug delivery. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 1333–1343
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CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Junxiu Wang,Zhenzong Zhang,Xi Wang,Yi Shen,Yongfu Guo,Po Keung Wong,Renbi Bai
A novel p-n heterostructure photocatalyst m-Bi 2 O 4 /BiOCl was successfully synthetized through a facile ion-etching method. Via adjusting the added volume of HCl solution, a series of different ratios of composite photocatalysts were obtained. The as-prepared samples of physical, chemical and optical characteristics were examined by X-ray diffraction, scanning electron microscope, transmission electron microscope, energy dispersive X-ray spectroscopy, selected-area electron diffraction, Fourier transform infrared absorption, Raman microscope, N 2 adsorption-desorption, X-ray photoelectron spectroscopy and UV-vis spectrum technologies. The photocatalysts showed high degradation rate and complete mineralization ability for methyl orange and tetracycline solution under visible light. The reaction rate constant of m-Bi 2 O 4 /BiOCl for methyl orange was 52.28 times higher than that of BiOCl. The characterization presented a good stability of materials. Furthermore, the photocurrent response test certified that the heterostructure effectively accelerated the separation and migration of photo-generated carries. The scavenger experiments evidenced that hole (h + ) and superoxide radical (•O 2 — ) were the primary active radicals. A possible photocatalytic mechanism was proposed. This work provided an alternative photocatalyst applied to water environmental remediation.
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Energy Technology
·
2018
·Vol. 7
·期 3
·1800641
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IF 3.175
Ningzhao Shang,Shutao Gao,Xiaoyu Zhang,Shuaihua Zhang,Cheng Feng,Zhi Wang,Chun Wang
Both the surface composition and the pore texture of electrode materials have a significant effect on their electrochemical performances. Herein, a new type of nitrogen and phosphorus dual-doped hierarchically porous carbon (NP-HPC), fabricated by simultaneous pyrolysis and activation of the polyelectrolyte complex with chitosan and polyphosphoric acid as the precursor, is demonstrated. The NP-HPC has a hierarchically interconnected porous structure, high surface area (2933 m 2 g −1 ), and doping of heteroatoms. Due to its unique features, the optimal NP-HPC-800 demonstrates a high specific capacitance (289 F g −1 at 0.5 A g −1 ), excellent rate performance (238 F g −1 at 10 A g −1 ), and superior cycling stability (96% retention after 5000 cycles at 5 A g −1 ) in 6 mol L −1 of KOH. Furthermore, NP-HPC-800 shows an excellent energy density of 22.5 Wh kg −1 at a power density of 183.3 W kg −1 . The low-cost and facile fabrication process provides a feasible approach to prepare heteroatom-doped carbon materials from a biomass precursor for energy-related applications.
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APPLIED CATALYSIS A-GENERAL
·
2013
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IF 3.41
Wei Zhai,Fengqiang Sun,Wei Chen,Zizhao Pan,Lihe Zhang,Shaohua Li,Shuilan Feng,Yiyi Liao,Weishan Li
Octahedral Cu 2 O particles were prepared on an indium-tin oxide glass via electrodeposition and were employed in the catalytic degradation of p -nitrophenol in the presence of H 2 O 2 . Under irradiation of a warm visible-light source, tungsten halogen lamp, Cu 2 O particles not only acted as a photocatalyst, but might also act as a thermal-catalyst to induce the decomposition of H 2 O 2 and produce O 2 at higher temperatures. The photogenerated electrons and holes could react with H 2 O 2 , O 2 , and H 2 O to produce abundant OH radicals, resulting in the effective oxidation of p -nitrophenol. High-performance liquid chromatography measurements of degradation intermediates showed that p -nitrophenol was first decomposed into hydroquinone and benzoquinone and then mineralized. The degradation efficiency was dependent on electrodeposition time, light intensity, H 2 O 2 amount, and solution temperature. This catalyst could be easily recycled and used in the efficient degradation of other phenolic compounds.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2012
·
IF 5.625
Weiming Wu,Linrui Wen,Lijuan Shen,Ruowen Liang,Rusheng Yuan,Ling Wu
Photoreduction of 4-nitroaniline to p -phenylenediamine over TiO 2 , ZnO, PbBi 2 Nb 2 O 9 and CdS photocatalysts in the presence of CH 3 OH was investigated under light irradiation ( hv ≥ band gap) upon purging with N 2 . Compared with PbBi 2 Nb 2 O 9 and CdS, TiO 2 and ZnO showed photocatalytic activities for the photoreduction of 4-nitroaniline. Electron spin resonance analysis results revealed that a methanol radical could be detected in the present of TiO 2 and ZnO. Its formation was attributed to the reaction between the hydroxyl radical and CH 3 OH molecule. The species had strong reductive ability, and therefore could reduce 4-nitroaniline to p -phenylenediamine. Other alcohols (C 2 H 5 OH and i -C 3 H 7 OH) were also found to be efficient additives for the photoreduction of 4-nitroaniline. The results of the 2 H-labeled experiments indicated that the p -phenylenediamine formation was formed by the hydrogen transfer reaction between the 4-nitroaniline and H 2 O molecules. A mechanism was proposed to explain the photoreduction of 4-nitroaniline to p -phenylenediamine in the present alcohols.
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MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 7
·1323-1328
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IF 3.741
Ran Gu,Chen Chuanning,Gu Chuan
A glassy carbon electrode was modified with a nanocomposite prepared from poly(p-aminobenzene sulfonic acid), multi-walled carbon nanotubes and chitosan to obtain a differential pulse voltammetric sensor for serotonin that is remarkably stable and displays enhanced current response. Its peak current (at 0.38 V vs. Ag/AgCl) varied linearly with the concentration of serotonin in the 0.1–100 μM range, and the detection limit is 80 nM (at an S/N of 3). The sensor was successfully applied to the determination of serotonin in (spiked) human blood serum.
An electrode modified with MWCNTs, chitosan and poly(p-aminobenzene sulfonate) gives significantly enhanced signals for serotonin and improves its oxidation peak current as shown in plot (d) due to improved direct electron transfer.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2015
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IF 2.037
Chunlin Li,Qinbo Wang,Binwei Shen,Zhenhua Xiong,Chuxiong Chen
The mole fraction solubilities of 5,10,15,20-tetraphenylporphyrin (TPP) and 5,10,15,20-tetra(p-chlorophenyl)porphyrin (p-ClTPP) in binary system N,N-dimethylformamide (DMF) + water solvent mixtures were measured at atmospheric pressure by using the static method. The temperature and effects of mole fraction of DMF in the solvent mixtures on solubility were studied. The results show that the solubilities of TPP and p-ClTPP increase with the increasing temperature for a certain solvent composition, and the solubilities show a maximum in pure DMF, then the solubilities decrease when the water was added to the system. The experimental data were correlated with modified Apelblat equation. The solubilities calculated by the model were in good agreement with experimental observations. Thermodynamic parameters such as dissolution enthalpy, isobaric heat capacity and Gibbs energy were obtained from the solubility data by using the Clark–Glew equation together with the modified Apelblat equation. The result demonstrated that the dissolving process of TPP and p-ClTPP in DMF + water solvent mixtures is endothermic and not spontaneous.
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THERMOCHIMICA ACTA
·
2013
·
IF 1.989
Yanfang Liu,Jie Zhang,Chunyan Liao,Junfeng Zheng,Shasha Zhao,Mingtao Run
A copolymer of p -aminobenzonitrile type benzoxazine (BA-pabn) and diglycidyl ether of bisphenol-A (DGEBA) was prepared. With rising DGEBA content, the peak temperature of the differential scanning calorimetry curve for polymerization of BA-pabn/DGEBA blend shifts to higher value, and the roughness of the fracture surface of the BA-pabn/DGEBA copolymer increases. In the glassy state, the storage modulus of the copolymer initially tends to increase with rising DGEBA content over pure polybenzoxazine (PBA-pabn), but decreases when DGEBA content reaches to 50 wt%. The copolymer exhibits a single glass transition temperature lower than that of PBA-pabn. The onset weight loss temperature of the copolymer is higher than that of PBA-pabn, but the char yield at 800 °C is lower.
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高影响因子
TRIBOLOGY INTERNATIONAL
·
2015
·
IF 1.936
Changqing Miao,Lei Zhang,Ke Zheng,Yuanchen Cui,Shengmao Zhang,Laigui Yu,Pingyu Zhang
Ploy( p -methoxyphenol), denoted as PMOP, was synthesized via an enzymatic polymerization method with p -methoxyphenol as the monomer . The corrosion resistance , tribological properties and thermal stability of as-synthesized PMOP were examined. The antioxidation behavior of as-synthesized PMOP as an antioxidant in ester oils was evaluated by rotary oxygen bomb test and pressurized differential scanning calorimetry . It was found that PMOP exhibits excellent antioxidation ability at 150 °C and 210 °C in various base oils. Besides, PMOP has much better antioxidation ability in synthetic ester oil like di-iso-octyl sebacate than several commonly used commercial hindered phenolic antioxidants.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Lei Li,Yujie Feng,Youzhi Liu,Bing Wei,Jiaxin Guo,Weizhou Jiao,Zhaohan Zhang,Qiaoling Zhang
In this study, titanium dioxide (TiO 2 ) nanoparticles were surface-modified with salicylic acid (SA) and arginine (Arg) using an environmentally friendly and convenient method, and the bonding structure, surface properties and degradation efficiency of p-nitrophenol (PNP) were investigated. X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FT-IR), water contact angle (WCA) measurements, ζ-potentiometric analysis, UV/visible diffuse reflectance spectroscopy (UV–vis DRS), and thermogravimetric analysis (TGA) were performed to evaluate the modification effect. The degradation rates were determined by high-performance liquid chromatography (HPLC). The results show that bidentate or bridging bonds are most likely formed between SA/Arg and TiO 2 surface. Surface modification with SA, Arg, or both can improve the lipophilic properties and decrease the zeta potential, and also result in a red shift of the absorption wavelength. TiO 2 nanoparticles modified by Arg or both SA and Arg show a large specific surface area and pore volume. Further, degradation experiments under visible light show that Arg modification is most efficient. This simple and versatile synthetic method to produce TiO 2 nanoparticles surface-modified with various organic capping agents can be used for novel multifunctional photocatalysts as required for various applications in energy saving and environmental protection.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Fangwei Pan,Rongjun Qu,Xinhua Jia,Changmei Sun,Hushan Sun,Kai An,Yinglei Mu,Chunnuan Ji,Ping Yin,Ying Zhang
Poly( p -phenylene terephthalamide) (PPTA) coated multi-walled carbon nanotubes (PPTA-MWNTs) showed an enhancement effect on the yield strength and Young’s modulus of PVC composite films, but no improvement in toughness. In this paper, MWNTs were covalently and non-covalently coated by N -epoxypropyl PPTA (PPTA-ECH) to prepare PPTA-ECH-MWNTs-NH 2 -x and PPTA-ECH-MWNTs-x, which were used as additives to reinforce PVC composite films. It was found that the maximum yield strength, Young’s modulus, and toughness of PPTA-ECH-MWNTs-NH 2 -x/PVC composite films increased by 227.84%, 201.56%, and 589.96%, respectively, in comparison to pure PVC, while those of PPTA-ECH-MWNTs-x/PVC composite films increased by 215.08%, 153.13%, and 540.81%, respectively. The maximum yield strength, maximum Young’s modulus, and maximum toughness of both PPTA-ECH-MWNTs-NH 2 -x/PVC and PPTA-ECH-MWNTs-x/PVC showed significant improvement as compared to PPTA-MWNTs/PVC composite film and PPTA-MWNTs-NH 2 /PVC. This indicates that N -epoxypropyl PPTA covalently and non-covalently coated MWNTs are promising additives for reinforcing PVC.
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