Removal of nitrate using amine-grafted and magnetized mesoporous silica material, SBA-15 = Removal of nitrate using amine-grafted and magnetized mesoporous silica material, SBA-15

다국어 초록 (Multilingual Abstract)

Mesoporous silica materials such as SBA-15 and MCM-48 have been used in removing nitrates from water bodies. Because of their chemical stability, their adsorption capacities for nitrates are not so high. In most adsorption applications, the important factors are not only their high adsorption capacity but also the reusability of adsorbent materials. Therefore the pristine silica materials are amine-grafted and magnetized to overcome these limitations. In this work, P123, poly(ethylene glycol)- block-poly(propylene glycol)-block-poly(ethylene glycol), was used as a structure directing agent and TEOS, tetraethyl orthosilicate, was used as a silica source for the synthesis of SBA-15. The magnetization of SBA-15 was carried out by introducing 0.5 g of SBA-15 into a solution of 1.34 g Fe(NO3)3ㆍ9H2O and methanol, drying the mixture in an oven at 85°C and then slowly reacting the resultant powder with propionic acid at 105°C. The final product was thermally treated with a rate of 1°C/min to 300°C and then kept it for 5 hr. It was proven that the final silica material is a good recyclable adsorbent for removing and recovering nitrates from water streams.