Premium
Fabrication of α ‐Si 3 N 4 ‐nanowire/ γ ‐Y 2 Si 2 O 7 composite superhydrophobic membrane for membrane distillation
Author(s) -
Yang MingYe,
Dong BinBin,
Wang FeiHong,
Xu Xin,
Agathopoulos Simeon
Publication year - 2019
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13247
Subject(s) - materials science , membrane distillation , membrane , contact angle , composite number , fabrication , nanowire , chemical engineering , wetting , nanotechnology , nanoparticle , desalination , composite material , biology , medicine , genetics , alternative medicine , pathology , engineering
This paper reports on the successful fabrication of α ‐Si 3 N 4 ‐nanowire/Y 2 Si 2 O 7 composite membranes with superhydrophobic properties, aiming to achieve a high performance in membrane distillation. The starting powder mixture of 87 wt% γ ‐Y 2 Si 2 O 7 , 5 wt% Si, 3 wt% LiYO 2 , and 5 wt% ferrocene catalyst was dispersed in a stable suspension, and after being tape‐casted, it was sintered at 1300°C for 4 hours in order to obtain the composite membrane. α ‐Si 3 N 4 nanowires with a diameter of about 50 nm were formed, distributed uniformly on the surface and in the pores of the membrane and their presence greatly favored superhydrophobicity. After surface modification with a robust hydrophobic layer of SiNCO nanoparticles, strongly adhered to the surface of the produced membrane, a water contact angle of 153 o , was measured. Water desalination experiments, using a sweeping gas membrane distillation (SGMD) device, were conducted. High water flux of 11.91 L/m 2 /h was achieved for a 4 wt% NaCl feeding solution at 90°C. Stable water flux and rejection rates were recorded in long‐term experiments (>500 hours) using the produced superhydrophobic composite membrane.