疏水磁性碳酸钙的制备及其除油特性

Preparation of hydrophobic magnetic calcium carbonate and its oil removal properties

以硬脂酸为疏水改性剂,将其与Fe_(3)O_(4)纳米颗粒和市售CaCO_(3)共混,分别以不同的原料质量比,制备疏水磁性碳酸钙HMC-1和HMC-2,并将HMC-2负载在PU海绵上用以提高其实用性能。采用X射线粉末衍射仪、红外光谱仪、差示扫描量热仪、接触角/表界面张力测量仪对合成样品的物相、表面有机官能团、热稳定性及疏水性能进行系列表征分析。结果表明,HMC-2比HMC-1,具有更稳定的疏水性能,除油前后水接触角基本保持不变,约为150°,除油后该材料没有出现类似HMC-1的铁渗出现象。将HMC-2负载在PU海绵上后,改性PU海绵在3 s内可去除98%的油,重复吸油20次仍能达到95%以上的除油率,吸油倍率(吸附油质量/吸附剂质量)大于100。

The hydrophobic magnetic materials of HMC-1 and HMC-2 were obtained by blending synthesized Fe_(3)O_(4) nanoparticles and commercial CaCO_(3) 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.