Abstract
Separating materials of oil/water are widely used to deal with oil leakage and industrial oily wastewater. Herein, hydrophobic–oleophilic porous ceramics of Al2O3–ZrO2 were prepared by combustion synthesis-molding method and modified with 3-amino-propyltriethoxysilane (APTES). The effects of Al2O3–ZrO2 mole ratio, starch content and sintering temperature on permeability of porous ceramics were investigated in detail. When the molar ratio of Al2O3–ZrO2 is 1:0.15 and the amount of starch is 35 wt%, the porous ceramics with average pore diameter of about 42 nm and porosity of about 46% can be obtained after sintering at 1450 °C for 2 h. APTES was adopted to modify the porous ceramic of Al2O3–ZrO2 to construct the hydrophobic surface. The optimum conditions of modification for the Al2O3–ZrO2 ceramic were that the time was 4 h, the temperature was 70 °C and the modifier concentration was 2%. Most notably, the as-prepared hydrophobic ceramic was a rare example that adopted hydrophilic molecule to build hydrophobic material. Due to the favorable permeability and hydrophobicity, the Al2O3–ZrO2 ceramic was designed into sand core to separate oil/water mixture. The ceramic displays high separation efficiency (93%), good reuse performance (10 cycles) and super abrasion resistance (10 times).
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Acknowledgements
This work was supported by the Scientific Research Fund of Hunan Provincial Education Department (17C0948), the Opening Fund of Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), Hunan Normal University (KLCBTCMR201808) and the Opening Fund of The State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (CMEMR2019-B03).
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Xie, S., Guo, L., Zhang, M. et al. Durable hydrophobic ceramics of Al2O3–ZrO2 modified by hydrophilic silane with high oil/water separation efficiency. J Porous Mater 28, 1115–1127 (2021). https://doi.org/10.1007/s10934-021-01055-7
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DOI: https://doi.org/10.1007/s10934-021-01055-7