Zhao Mengqi, Ma Xiaoqing, Chao Yuxi, Chen Dejun, Liao Yinnian
School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830017, China.
State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, Urumqi 830017, China.
Polymers (Basel). 2022 Sep 7;14(18):3726. doi: 10.3390/polym14183726.
In this study, magnetic fly ash was prepared with fly ash and nano-magnetic FeO, obtained by co-precipitation. Then, a magnetic fly ash/polydimethylsiloxane (MFA@PDMS) sponge was prepared via simple dip-coating PDMS containing ethanol in magnetic fly ash aqueous suspension and solidifying, whereby FeO played a vital role in achieving the uniformity of the FA particle coating on the skeletons of the sponge. The presence of the PDMS matrix made the sponge super-hydrophobic with significant lubricating oil absorption capacity; notably, it took only 10 min for the material to adsorb six times its own weight of n-hexane (oil phase). Moreover, the MFA@PDMS sponge demonstrated outstanding recyclability and stability, since no decline in absorption efficiency was observed after more than eight cycles. Furthermore, the stress-strain curves of 20 compression cycles presented good overlap, i.e., the maximum stress was basically unchanged, and the sponge was restored to its original shape, indicating that it had good mechanical properties, elasticity, and fatigue resistance.
在本研究中，用粉煤灰和通过共沉淀法获得的纳米磁性FeO制备了磁性粉煤灰。然后，通过在磁性粉煤灰水悬浮液中简单浸涂含乙醇的聚二甲基硅氧烷（PDMS）并固化，制备了磁性粉煤灰/聚二甲基硅氧烷（MFA@PDMS）海绵，其中FeO在使FA颗粒在海绵骨架上均匀包覆方面起着至关重要的作用。PDMS基体的存在使海绵具有超疏水性和显著的润滑油吸收能力；值得注意的是，该材料仅需10分钟就能吸收其自身重量六倍的正己烷（油相）。此外，MFA@PDMS海绵表现出出色的可回收性和稳定性，因为在超过八次循环后未观察到吸收效率下降。此外，20次压缩循环的应力-应变曲线呈现出良好的重叠，即最大应力基本不变，并且海绵恢复到其原始形状，表明它具有良好的机械性能、弹性和抗疲劳性。
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