| Effect of Porogenic Agent Type and Firing Temperatures
on Properties of Low-Cost Microfiltration Membranes
from Kaolin |
Mouafon Mohamed,a Njoya Dayirou,a,* Hajjaji Mohamed,b Njoya André,c Lecomte-Nana Gisèle Laured
and Njopwouo Daniela
Pages : 1-12
DOI : 10.1080/0371750X.2019.1692695 |
| Abstract |
| The present work is focused on the development and characterization of low-cost flat
microfiltration ceramic membranes from West Cameroonian kaolin, cassava starch
and bovine bone ash as pore-forming agents, and comparative study of porogens’
influence on membranes properties. These materials were chosen due to their
abundance in the country and their beneficial properties. The proportion of porogens
varied from 0% (CM0) to 20% and all samples were treated at 1000o-1150oC; membranes
without porogenic agent (CM0) gave good results. Linear shrinkage and weight loss
values were <7% and <30%, respectively. SEM pictures revealed that inter-granular
contacts were formed at 1150oC for all the samples and thus materials densification
was more important. Porosity varied between 31% and 52% at 1150oC, and flexural
strength increased from 1.07 to 7.79 MPa. Samples containing bovine bone ash
contributed to the improvement of membrane microstructure, mechanical and
corrosion resistance. Filtration tests through CM04 and CM34 gave turbidity rejection
factors of 97.70% and 99.26%, respectively. Decisively, good and low-cost
microfiltration ceramic membrane can be developed by using cassava starch and
bovine bone ash as porogenic agents.
[Keywords: Kaolin, Bovine bone, Cassava starch, Ceramic membranes, Filtration test] |
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