Department of Chemistry, Supercritical Fluid Centre and Materials Section, University College Cork, Cork, Ireland.
J Hazard Mater. 2011 Jan 15;185(1):382-91. doi: 10.1016/j.jhazmat.2010.08.128. Epub 2010 Sep 18.
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 Å. 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.
在这项研究中，通过吸附研究了掺杂不同金属氧化物（Zr、Ti、Fe 和 Al）的有序介孔硅（OMS）在水中去除（邻位）磷酸盐离子的应用。采用氮气物理吸附（BET）、粉末 X 射线衍射（PXRD）和透射电子显微镜（TEM）对材料进行了表征。掺杂材料的比表面积在 600 到 700 m(2)g(-1)之间，表现出 44-64 Å 的孔径。通过在提取前后使用紫外可见（UV-vis）光谱测量水溶液中磷酸盐的浓度来确定磷酸盐的吸附。考察了不同金属氧化物负载比、磷酸盐溶液初始浓度、温度和 pH 值对磷酸盐去除效率的影响。掺杂介孔材料是有效吸附剂，在适当的条件下，可达到 100%的去除率。还研究了从掺杂硅酸钠中“反萃取”（水处理后）磷酸盐，结果表明对吸附剂几乎没有不利影响。
