| 초록 |
Forward osmosis (FO) is an emerging technology for desalination and water reuse. Finding of feasible draw solute which is the origin of the driving force for FO is one of the most important challenges of the whole research of FO system. Osmotic pressure generation and easy recycling are most required properties of draw solute. Magnetic nanoparticle (MNP) has full of promise as feasible draw solute. However, decline of osmotic performance after recycling process, caused by particle core agglomeration, is one of the main problems of MNP draw solute. To overcome the limitation of MNP draw solutes, we synthesized MNP capped with hydrophilic siloxane for draw solute. Siloxane linkages of silane ligands are considered to be a protector of particle core against agglomeration. First, to obtain the similar-size-distributed MNPs, Fe3O4/oleic acid MNPs were synthesized by thermal decomposition method. After that, oleic acid on the Fe3O4 surface were exchanged to hydrophilic silane and siloxane linkages were formed by condensation of silane during this ligand exchange reaction. Physical properties of synthesized MNPs were thoroughly characterized by TEM, DLS, SQUID, TGA, FT-IR, and osmometry. To analyze the performance of synthesized MNPs as the draw solutes, water flux and particle mean size were measured after repeating FO process. Results of this work show that Fe3O4/hydrophilic siloxane MNPs are feasible draw solute in FO system. |
