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Wei K.,South China University of Technology | Wei K.,National Engineering Research Center for Human Tissue Restoration and Function Reconstruction | Shu L.,South China University of Technology | Shu L.,National Engineering Research Center for Human Tissue Restoration and Function Reconstruction | And 6 more authors.
Chinese Journal of Chemistry | Year: 2011

Highly ordered amino-functionalized hexagonal mesoporous silica (HMS-NH2) had been synthesized successfully by co-condensation. The resultant materials were characterized by means of XRD, TEM, FT-IR, N 2 ad-desorption and 29Si NMR to confirm the ordered mesoporous structure and the functionalization of the amino groups. The sample was employed as a Pb2+adsorbent in aqueous solutions at room temperature. Both Lagergren's first order kinetic model and Lagergren's second order kinetic model were used to describe the adsorption data. It was found that the pseudo second order model fitted the sorption kinetic data better than the pseudo first order model. According to the information analyzed from AAS, HMS-NH2 had a Pb2+adsorption amount of over 90.7 mg·g-1, showing a promising application for the treatment of wastewater containing Pb2+ions. Highly ordered amino-functionalized hexagonal mesoporous silica (HMS-NH2) has been synthesized successfully by co-condensation, and its adsorption behavior for Pb 2+ions has been studied and discussed. Copyright © 2011 SIOC, CAS, Shanghai & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Wang Q.,South China University of Technology | Wang Q.,National Engineering Research Center for Human Tissue Restoration and Function Reconstruction | Wang Q.,South China Normal University | Ren L.,South China University of Technology | And 13 more authors.
Journal of Applied Polymer Science | Year: 2013

This study presented the synthesis and characterization of glucosamine (GlcN) modified poly (ethylene glycol) (PEG) hydrogels. The chemical structure was characterized by Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (1H NMR) spectroscopy. The morphology of hydrogels was observed by scanning electron microscopy (SEM). The results indicated that GlcN was successfully incorporated into PEG hydrogel network. Moreover, the data of the swelling ratio showed that the ratio of GlcN-modified PEG hydrogels was lower than that of pure poly(ethylene glycol) diacrylated (PEGDA). Biocompatibility of unreacted GlcN monomer and GlcN-modified hydrogels was also evaluated in vitro. Compared with glucosamine hydrochloride, 2 and 5 mM N-acroloyl-glucosamine monomer exhibited no toxicity against bone marrow stromal cells (BMSCs), while with the concentration increased to 10 mM, cell viability appeared to decrease. However, when BMSCs were encapsulated in GlcN-modified hydrogels via photopolymerization method, cells remained vigorous viability. Metabolic activity of the encapsulated cells demonstrated GlcN-modified hydrogels was favorable for cell proliferation. Compared with free GlcN, covalent binding GlcN showed lower cytotoxicity and higher cell proliferation properties. As a result, GlcN-modified PEGDA hydrogels could be used as safe and injectable cell carriers for in situ tissue engineering applications. © 2012 Wiley Periodicals, Inc. Source

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