锚定金属离子-螯合物的介孔硅除磷性能研究

采用3种介孔硅分子筛制备了锚定金属离子-螯合物的介孔硅吸附剂。系统研究了硅分子筛、螯合剂、金属离子和吸附时间等因素对吸附剂磷吸附性能的影响。结果表明,硅分子筛、螯合物和金属离子对吸附剂的磷吸附性能有显著的影响,其对介孔硅吸附剂磷吸附量影响的顺序分别为:SBA15>MCM41>MCM48,Fe-SH-MCM41<

Phosphorus Removal Performance of Meso-porous Silica Anchored with Cationic Metal-chelate Complexes

This paper intends to develop new adsorbents for removing phosphorus from water in water eutrophication control.Meso-porous silica adsorbents anchored with cationic metal-chelate complexes were prepared at the laboratory using three kinds of meso-porous molecular sieves.Factors,such as the chelating agent,silica sieves,metal ions and adsorption time,which might influence phosphorus adsorption of the adsorbents were systemically investigated.The results showed that there were three factors that played important roles in the phosphorus-adsorption,i.e.,silica sieves,chelating agent and metal ions;and the chelating agent anchored with metal ion greatly improved the phosphorous adsorption ability,the adsorption capacity Fe-2N-SBA 15 dramatically was increased to 49.77 mg/g from 5.4 mg/g of SBA15.With regard to adsorption kinetics,the isotherm experimental results showed that the meso-porous silica adsorbents anchored with cationic metal-chelate complexes were excellent in phosphorus removing with very rapid adsorption rate and high adsorption capacity.The adsorbent Fe-2N-MCM41 was able to remove phosphorus from the aqueous solution from the initial 50 mg/L to 9.8 mg/L within one minute.