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Ji X.,Huanhu Hospital | Ji X.,Tianjin Cerebral Vascular and Neural Degenerative Disease Key Laboratory | Song Y.,Tianjin University | Han J.,Huanhu Hospital | And 8 more authors.
Journal of Colloid and Interface Science | Year: 2017

A green approach for the preparation of a stable reduced graphene oxide (RGO) suspension from graphene oxide (GO) has been developed. This method uses L-serine (L-Ser) as the reductant and yellow dextrin (YD) as the stabilizing agent. X-ray photoelectron spectroscopy, UV–vis spectroscopy, X-ray diffraction and thermogravimetric analyses showed that L-Ser can efficiently reduce GO at a comparatively low temperature, and that the YD adsorbed onto the RGO facilitating the formation of a stable RGO aqueous suspension. Since L-Ser and YD are natural environmentally friendly materials, this approach provides a green method to produce stable RGO from GO on a large scale. Sodium salicylate (SS) which has an aromatic structure was loaded onto the RGO through π-π interactions and a maximum loading capacity of 44.6 mg/g was obtained. The release of the loaded SS can be controlled by adjusting the solution pH, and a 74.8% release was reached after 70 h at pH 7.4. The release profile of SS could be further controlled by incorporating it into RGO Dispersed carboxylated chitosan films. © 2016


Zhang Y.,Huanhu Hospital | Zhang Y.,Tianjin Cerebral Vascular and Neural Degenerative Disease Key Laboratory | Yan W.,Huanhu Hospital | Yan W.,Tianjin Cerebral Vascular and Neural Degenerative Disease Key Laboratory | And 4 more authors.
RSC Advances | Year: 2014

A facile and efficient approach was developed to synthesize Ag/Cu@Fe 3O4 hybrid nanoparticles using l-lysine as a linker. The morphology, composition and crystal structure of the prepared Ag/Cu@Fe 3O4 hybrid nanoparticles were characterized by Fourier Transform infrared spectroscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy and powder X-ray diffraction. The magnetic properties of the nanoparticles were determined with a vibrating sample magnetometer. The catalytic activity of the Ag/Cu@Fe3O4 hybrid nanoparticles for the reduction of 4-nitrophenol was also studied. The Ag/Cu@Fe3O4 hybrid nanoparticles are efficient catalysts and can easily be recovered from the reaction system because of their magnetic properties. In addition the Ag/Cu@Fe3O4 catalyst had good reusability. This cost effective and recyclable catalyst provides a new material for use in environmental protection applications. © the Partner Organisations 2014.


Zhang Y.,Huanhu Hospital | Zhang Y.,Tianjin Cerebral Vascular and Neural Degenerative Disease Key Laboratory | Gao C.,State Oceanic Administration | Zhao W.,Huanhu Hospital | And 11 more authors.
RSC Advances | Year: 2014

Porous chitosan/gelatin (CS/Gel) foams with ordered porous structures were prepared by a unidirectional freeze-drying method. The CS/Gel foams had ordered porous structures with high porosities. The porosity of the foam depended on the concentration of the CS/Gel preparation solution and the CS/Gel ratio. The CS/Gel concentration affected the compressive strength of the porous CS/Gel foams and higher concentrations resulted in better strength. The CS/Gel ratio affected both the compressive strength and the degradation rate of the CS/Gel foam. Low CS/Gel ratios resulted in foams with higher compressive strength and higher degradation rates. The CS/Gel foams had a high adsorption capacity for aqueous Pb2+ and Co2+ ions and fetal bovine serum. In addition, gentamicin loaded CS/Gel foams had different release rates which depended on the composition and porous structure of the foams. The CS/Gel foams should be useful as scaffolds for cell cultures or drug releasing implants. This journal is © the Partner Organisations 2014.


Zhang Y.,Huanhu Hospital | Zhang Y.,Tianjin Cerebral Vascular and Neural Degenerative Disease Key Laboratory | Yan W.,Huanhu Hospital | Yan W.,Tianjin Cerebral Vascular and Neural Degenerative Disease Key Laboratory | And 7 more authors.
Carbohydrate Polymers | Year: 2015

Ordered porous zeolite/chitosan (Zel/Chi) monoliths were prepared by a unidirectional freeze-drying method, and their properties and structures were characterized by various instrumental methods. The metal ion adsorption and the drug release performance of the porous Zel/Chi monoliths were also studied. The release rate of cefalexin from drug-loaded Zel/Chi monoliths depended on the composition and porous structure of the monoliths. The metal ion adsorption capacity of the Zel/Chi monoliths was related to the concentration of the metal ions, the adsorption time and the Zel/Chi ratio. An experimentally maximum adsorption of 89 mg/g was achieved for Cu2+ ions. The Zel/Chi monoliths with adsorbed Cu2+ ions effectively catalyzed the reduction of 4-nitrophenol to 4-aminophenol and had good recyclability. They were easily recovered by simply removing them from the reaction system and rinsing them with water. © 2014, Elsevier Ltd. All rights reserved.

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