Preparation of hydrophobic magnetic calcium carbonate and its oil removal properties

Abstract

The hydrophobic magnetic materials of HMC-1 and HMC-2 were obtained by blending synthesized Fe3O4 nanoparticles and commercial CaCO3 powder with stearic acid solution, which is used as hydrophobic modifier. HMC-2 was loaded on the PU sponge for the further improvement of the applicability. The structural properties of the two materials were detected by X-ray powder diffractometer and infrared spectrometer. Thermal stability of HMC-2 was analysed by differential scanning calorimeter. The hydrophobic properties of the samples were determined by contact angle meter. The results show that HMC-2 has more stable hydrophobic properties than HMC-1. HMC-2 exhibits more stable hydrophobic performance. The contact angle remains nearly unchanged (about 150°) after oil removal. HMC-2 shows no release of Fe(Ⅲ) ions, which has taken place during the oil removal experiment using HMC-1. PU sponge loaded with HMC-2 can remove 98% oil in 3 s. The oil removal rate remains 95%, after 20 times of repeated oil absorption. The mass ratio of oil adsorption/adsorbent is larger than 100.

Keywords

• caco3
• fe3o4
• oil removal
• magnetism