Copper Absorption by Glass Derived Hydroxyapatite Scaffolds Prepared by Dipping with Polymer Foam

Gu, Dong Lin; Ou, Hai Peng; Wang, Jiao Jiao; Rüssel, Christian; Liang, Wen

doi:10.4028/www.scientific.net/AMM.275-277.2333

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Copper Absorption by Glass Derived Hydroxyapatite Scaffolds Prepared by Dipping with Polymer Foam

Abstract:

Sodium calcium borate glass derived hydroxyapatite (G-HAP) scaffolds were prepared by dipping with polymer foam. The effects of glasses and ethyl-cellulose (EC) content on the porosity and compressive strength of the scaffolds were studied. The effects of different initial pH value and ions concentration on adsorption performance of copper ions in aqueous solutions were also investigated. The results showed that G-HAP scaffolds could immobilize copper ions in solution effectively. The mechanism of G-HAP scaffolds in immobilizing Cu2+ ions from aqueous solutions was investigated by the X-ray diffraction, Infrared Spectra and Scanning electron microscopy-Energy Dispersive Spectrometer.

Info:

Periodical:

Applied Mechanics and Materials (Volumes 275-277)

Main Theme:

Applied Mechanics and Materials I

Edited by:

Guangfan Li and Chaohe Chen

Pages:

2333-2337

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.275-277.2333

Citation:

D. L. Gu et al., "Copper Absorption by Glass Derived Hydroxyapatite Scaffolds Prepared by Dipping with Polymer Foam", Applied Mechanics and Materials, Vols. 275-277, pp. 2333-2337, 2013

Online since:

January 2013

Authors:

Dong Lin Gu, Hai Peng Ou, Jiao Jiao Wang, Christian Rüssel, Wen Liang

Keywords:

Adsorption, Cu²⁺, Glass Derived Hydroxyapatite (G-HAP) Scaffolds

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Paper TitlePages

Adsorption of Ag⁺ from Aqueous Solutions by Rice Husk

Authors: Xiao Qing Luo, Xiao Yan Lin, Xue Gang Luo, An Kai Luo, Xuan Liang

Abstract: This paper reports the feasibility of using rice husk to remove Ag+ from synthetic wastewater. Effect of various adsorption parameters, namely, pH, adsorbent dose, initial silver concentration and contact time has been studied in batch systems. The results indicated that rice husk offered high removal efficiency, fast adsorption rate and high uptake capacity for Ag+ ions. The equilibrium was attained within 20 min and the maximum removal efficiency at 11g/L rice husk and at pH 2 was found to be 99.76%. The kinetic data was fitted well to pseudo-second order model. The isotherm adsorption data was well described by the Langmuir isotherm model and the maximum uptake capacity of Ag+ ions onto rice husk was found to be 42.43 mg/g.

Synthesis of Strontium Substituted Hydroxyapatite through Different Precipitation Routes

Authors: Liga Stipniece, Kristine Salma-Ancane, Dagnija Loca, Sintija Pastare

Abstract: The aim of this work was to evaluate the effect of precursor materials used in the synthesis on the Sr incorporation levels into the hydroxyapatite (HAp) lattice and to characterize the synthesis products. HAp powders containing various amounts of Sr were synthesized through three different precipitation routes. In all cases, the as-synthesized products were found to be pure HAp. However, atomic absorption spectrometry analysis showed that by reacting orthophosphoric acid with calcium hydroxide and strontium hydroxide, as well as by reacting diammonium hydrogen phosphate with calcium nitrate tetrahydrate and strontium nitrate a significant proportion of the Sr added, did not substitute into the HAp lattice. X-ray diffraction analysis revealed that the effect of substituting relatively high amounts (up to 3.69 ± 0.37 wt.%) of Sr into the HAp lattice was to decrease the cristallinity. Brunauer-Emmett-Teller (nitrogen absorption) analysis showed that the incorporation of Sr reduced particle sizes of the precipitated HAp products. Contrary, scanning electron microscopy revealed that the incorporation of Sr increased length of the precipitated needle-like particles.

Hydroxyapatite Nanoparticles: Synthesis by Sonochemical Method and Assessment of Processing Parameters via Experimental Design

Authors: Lívia Fernandes Cóta, Karla Patricia Macedo Licona, Juliana do Nascimento Lunz, Alexandre Antunes Ribeiro, Lizette Morejón Alonso, Marize Varella de Oliveira, Luiz Carlos Pereira

Abstract: Hydroxyapatite (HAp) has been synthesized by different techniques, and sonochemical methods have shown to be useful in the HAp nanopartcicles production for biomedical applications such as bone graft substitute. In addition, experimental design is an appropriate tool for planning and evaluating a study to meet specified objectives. Then, this work aimed to synthesize HAp nanosized powders by a sonochemical method and assess the processing parameters via experimental design, in order to obtain dense samples. HAp nanopowders were characterized by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscope/Field Emission Gun (SEM/FEG). For densification analysis, HAp samples were processed with different parameters, such as: compaction pressure (200 or 400 MPa), sintering temperature (900 or 1100°C), sintering heating rate (2 or 20 °C/min), and sintering time (2 or 4 hours). The samples were analyzed by SEM/FEG, whereas the linear shrinkage and density were considered the response variables for the experimental design. The results indicated that the sonochemical method successfully produced HAp nanoparticles with sphere-like morphology. Further, the experimental design showed that sintering temperature was the variable that most influenced the densification of samples.

896

Characterization of Porous Hyaluronan/β-TCP Scaffolds Prepared through Heterogeneous Crosslinking

Authors: Rui Min Zhao, Xian Ya Xue, You Fa Wang

Abstract: Porous Hyaluronan/β-tricalcium phosphate composite scaffolds were synthesized through lyophilizing and subsequent heterogeneous crosslinking method. The morphology of the composite scaffolds were investigated by scanning electron microscopy (SEM). The swelling behavior, mechanical property, degradation behavior and cell adhesion ability of samples were also studied. The results revealed that hyaluronan mainly contributed to the polymer matrix and water adsorption, whereas β-TCP acted as a reinforcement to strengthen the porous structure, while too much β-TCP would make the structure collapse. The pose size of obtained scaffolds ranges from100μm to 200μm and the porosity decreased with the increase of β-TCP content. The degradation behavior and cell adhesion test indicated that increasing hyaluronan concentration can effectively improve the degradability of scaffolds and the incorporation of β-TCP improved the cell adhesion performance. Thus a simple way to prepare hyaluronan-based composite scaffolds was provided, which could be potentially used as an tissue engineering material.