@article{article_351708, title={Preparation of Al2O3 Supports for Thin Membrane Fabrication}, journal={Journal of the Turkish Chemical Society Section A: Chemistry}, volume={5}, pages={191–204}, year={2017}, DOI={10.18596/jotcsa.351708}, author={Topuz, Berna and Yurttas, Ali Semih and Altunsoy, Ali}, keywords={membrane,support,alumina,high flux,colloidal processing}, abstract={<p class="MsoNormal" style="margin-bottom:.0001pt;text-align:justify;line-height:normal;"> </p> <p class="MsoNormal" style="margin-bottom:.0001pt;text-align:justify;line-height:normal;"> <span lang="en-gb" style="font-size:10pt;font-family:Verdana;" xml:lang="en-gb"> <span class="msoIns"> <ins cite="mailto:Microsoft%20Office%20User">In this study, macroporous </ins> </span> </span> <span lang="en-gb" style="font-size:10pt;font-family:Symbol;" xml:lang="en-gb"> <span class="msoIns"> <ins cite="mailto:Microsoft%20Office%20User"> <span>a </span> </ins> </span> </span> <span lang="en-gb" style="font-size:10pt;font-family:Verdana;" xml:lang="en-gb">- </span> <span lang="en-gb" style="font-size:10pt;font-family:Verdana;" xml:lang="en-gb"> <span class="msoIns"> <ins cite="mailto:Microsoft%20Office%20User">alumina
supports were prepared by using vacuum assisted filtration </ins> </span>of <span class="msoIns"> <ins cite="mailto:Microsoft%20Office%20User">α-Al <sub>2 </sub>O <sub>3 </sub> </ins> </span>suspensions
with different particle size <span class="msoIns"> <ins cite="mailto:Microsoft%20Office%20User">. </ins> </span>
The average particle sizes of the powders are 400 and 200 nm. <span class="msoIns"> <ins cite="mailto:Microsoft%20Office%20User"> </ins> </span>The prepared supports had smooth and
uniform surface microstructure and well suited for the fabrication of thin continuous
membrane. <span style="color:#000000;"> The microstructure consists of a random
close packing of 200 nm particles led to improved surface uniformity and
roughness. </span>ZnO spheres were prepared by homogeneous precipitation and added
to the colloidal suspension to modify the support structure and increase the
support flux. <span class="msoIns"> <ins cite="mailto:Microsoft%20Office%20User">Structural parameters such as pore diameter and
tortuosity of the prepared macroporous supports were estimated by using He, N <sub>2 </sub>,
CO <sub>2 </sub> permeance measurements. </ins> </span> <span style="color:#000000;">Slight
pressure dependence in the permeance values indicated the contribution of viscous
flow to the Knudsen flow. </span> The s <span class="msoIns"> <ins cite="mailto:Microsoft%20Office%20User">upports
prepared by </ins> </span>alumina powder <span class="msoIns"> <ins cite="mailto:Microsoft%20Office%20User"> </ins> </span>with <span class="msoIns"> <ins cite="mailto:Microsoft%20Office%20User"> a larger particle size exhibited </ins> </span>He <span class="msoIns"> <ins cite="mailto:Microsoft%20Office%20User"> permeance of </ins> </span>three <span class="msoIns"> <ins cite="mailto:Microsoft%20Office%20User"> times
higher than that of </ins> </span>prepared with a smaller particle size. The
addition of ZnO resulted in the increase in He permeance value significantly
for the support prepared by 400 nm particles in size. He permeance was in a
range of 8.5-8.7x10 <sup>-6 </sup> <span style="color:#000000;"> mol/(m <sup>2 </sup>sPa)
which is very close to the desired value of 1x10 <sup>-5 </sup> mol/(m <sup>2 </sup>sPa). <span class="msoIns"> <ins cite="mailto:Microsoft%20Office%20User"> </ins> </span> </span> </span> </p>}, number={1}, publisher={Turkish Chemical Society}