期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 185, 期 1, 页码 382-391出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2010.08.128
关键词
Phosphate pollution mitigation; Mesoporous; Sorbents
资金
- EPA [2009-PhD-ET-15, 2006-PhD-ET-12]
- Environmental Protection Agency Ireland (EPA) [2006-PhD-ET-12, 2009-PhD-ET-15] Funding Source: Environmental Protection Agency Ireland (EPA)
In this study, the application of ordered mesoporous silica (OMS) doped with various metal oxides (Zr, Ti, Fe and Al) were studied for the removal of (ortho) phosphate ions from water by adsorption. The materials were characterized by means of N(2) physisorption (BET), powder X-ray diffraction (PXRD) and transmission electron microscopy (TEM). The doped materials had surface areas between 600 and 700 m(2) g(-1) and exhibited pore sizes of 44-64 angstrom. Phosphate adsorption was determined by measurement of the aqueous concentration of orthophosphate using ultraviolet-visible (UV-vis) spectroscopy before and after extraction. The effects of different metal oxide loading ratios, initial concentration of phosphate solution, temperature and pH effects on the efficiency of phosphate removal were investigated. The doped mesoporous materials were effective adsorbents of orthophosphate and up to 100% removal was observed under appropriate conditions. 'Back extracting' the phosphate from the doped silica (following water treatment) was also investigated and shown to have little adverse effect on the adsorbent. (C) 2010 Elsevier B.V. All rights reserved.
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