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. GRAPHICAL ABSTRACT

中文翻译：

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致孔剂类型和焙烧温度对低成本高岭土微滤膜性能的影响

摘要目前的工作重点是开发和表征来自西喀麦隆高岭土、木薯淀粉和牛骨灰的低成本平板微滤陶瓷膜作为成孔剂，以及成孔剂对膜性能影响的比较研究。之所以选择这些材料，是因为它们在该国的丰富性和有益的特性。致孔剂的比例从 0% (CM0) 到 20% 不等，所有样品均在 1000o-1150oC 下处理；不含致孔剂 (CM0) 的膜给出了良好的结果。线性收缩率和重量损失值分别<7% 和<30%。SEM 照片显示，所有样品在 1150oC 下都形成了晶间接触，因此材料致密化更为重要。在 1150oC 时，孔隙率在 31% 到 52% 之间变化，弯曲强度从 1 增加。07 至 7.79 兆帕。含有牛骨灰的样品有助于改善膜的微观结构、机械和耐腐蚀性。通过 CM04 和 CM34 的过滤测试给出的浊度抑制因子分别为 97.70% 和 99.26%。果断地，通过使用木薯淀粉和牛骨灰作为致孔剂可以开发出良好且低成本的微滤陶瓷膜。图形概要