Carbon Nanotube Modified Sepiolite Porous Ceramics for High-efficient Oil/Water Separation

Abstract

To efficiently recovery oil from oil/water mixed liquid, fibrous sepiolite, polyethylene powder and nickel nitrate was respectively used as raw mateials, carbon source and pore-forming agents, and catalyst precursor to prepare carbon nanotubes (CNTs) modified sepiolite porous ceramics by freeze-drying/catalytic pyrolysis method, and the effects of solid content and pyrolysing temperature on the morphology of the modified porous ceramics were studied. The water contact angle and oil-water separation performance in severly environment such as acid (pH=1), alkali (pH=14), and high (373 K) and low temperature (77 K) were also characterized. The results showed that when the concentration of catalyst precursor solution was 0.5 mol/L, the solid content of sepiolite was 15wt%, the catalytic pyrolysis temperature was 973 K, and the soaking time was 2 h, the as-prepared CNTs modified porous ceramics possessed superhydrophobic/superlipophilic nature, and their maximum adsorption capacity for diesel, paraffin oil, vegetable oil, and vacuum pump oil is respectively 15.7, 20.8, 23 and 25 times of their own weight. The oil flux during the

Porous SiC Ceramic Matrix Composite Reinforced by SiC Nanowires with High Strength and Low Thermal Conductivity

“…The addition of the reinforcing phase can improve the strength of porous ceramic, but the strength of porous ceramic is more sensitive to pore size. Staggered one-dimensional nanowires are expected to build many nanopores, and toughen effect can be realized by reducing the size of the pore [17][18][19] . The low thermal conductivity of air fills the pores and the small size of pores causes less damage to mechanical strength, which makes it a better insulation effect, and possibly existing SiCNWs-pullout is expected to improve the brittleness [20] .…”