Preparation of a Porous, Sintered and Reaction-Bonded Si3N4 (SRBSN) Planar Membrane for Filtration of an Oil-in-Water Emulsion with High Flux Performance

Abstract

A porous, sintered, and reaction-bonded Si3N4 (SRBSN) planar membrane was prepared by phase-inversion tape-casting, nitridation (at 1350 °C), and sintering (at 1650 °C) of silicon slurry. The membrane was comprised of uniform rod-like β-Si3N4 crystals with a large length/diameter ratio and had high porosity and bending strength. The prepared membrane features a typical asymmetric structure with a skin layer, a sponge layer, and finger-like voids and an average pore size of 0.61 μm. A high permeation flux of 367 L m−2 h−1 and an oil rejection of 88.6% were recorded in oil-in-water emulsion separation experiments. These results suggest that SRBSN membranes have excellent potential for the treatment of oily wastewater.

Mechanical property and gas filtration behavior of porous reaction bonded Si3N4 with monodispersed PMMA as pore former

“…Porous ceramics that possess both high porosity and high strength are more advantageous. In Figure 11, the bending strength versus porosity of the specimens in this work and those reported elsewhere were illustrated 5,6,9,17–38 . The referred materials are porous PLS Si 3 N 4 , porous GPS Si 3 N 4 , porous PSRB Si 3 N 4 , porous RB Si 3 N 4 , porous Al 2 O 3, and porous SiC.…”

Gravity-Driven Separation of Oil/Water Mixture by Porous Ceramic Membranes with Desired Surface Wettability

“…On the other hand, the hydrophilicity of the ceramic membranes has traditionally made them unsuitable for the separation process where a small amount of oils needs to be removed from the water. Various materials have been used to modify ceramic membranes to make them hydrophobic and oleophilic [ 19 , 20 , 21 ]. Among these materials, fluoroalkylsilane (FAS) is mostly used as a surface coupling agent for ceramics.…”