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Removal of phosphate by fe-coordinated amino-functionalized 3D mesoporous silicates hybrid materials

Journal of Environmental Sciences 2011年第2期23卷 199-205页

作者： Jianda Zhang Zhemin Shen Zhijian Mei Shanping Li Wenhua Wang School of Environmental Science and Engineering Shanghai Jiaotong University Shanghai 200240 China School of Environmental Science and Engineering Shandong University Jinan 250100 China

Phosphate removal from aqueous waste streams is an important approach to control the eutrophication downstream bodies of water. A fe（Ⅲ） coordinated amino-functionalized silicate adsorbent for phosphate adsorption was synthesized by a post-grafting and metal cation incorporation process. The surface structure of the adsorbent was characterized by X-ray diffraction, N2 adsoropion/desoprotion technique, and Fourier transform infrared spectroscopy. The experimental results showed that the adsorption equilibrium data were well fitted to the Langmuir equation. The maximum adsorption capacity of the modified silicate material was 51.8 mg/g. The kinetic data from the adsorption of phosphate were fitted to pseudo second-order model. The phosphate adsorption was highly pH dependent and the relatively high removal of phosphate fell within the pH range 3.0-6.0. The coexistence of other anions in solutions has an adverse effect on phosphate adsorption; a decrease in adsorption capacity followed the order of exogenous anions： F^- 〉 SO4^2- 〉 NO3^- 〉 Cl^-. In addition, the adsorbed phosphate could be desorbed by NaOH solutions. This silicate adsorbent with a large adsorption capacity and relatively high selectivity could be utilized for the removal of phosphate from aqueous waste streams or in aquatic environment.

关键词： phosphate mesoporous material Fe coordinated adsorption

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