Low-cost ceramic membranes prepared from kaolin and quartz via tape casting using different pore formers

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics Pub Date : 2025-03-11 DOI:10.1016/j.oceram.2025.100765

Camila Silveira , Jessica Mulinari , Agenor De Noni Junior , Alan Ambrosi , Dachamir Hotza , Marco Di Luccio

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Abstract

Ceramic membranes offer high thermal, chemical, and mechanical stability, long lifespan, and high hydrophilicity. However, their high cost limits widespread use, highlighting the need for low-cost alternatives. This study evaluated kaolin and quartz for ceramic membranes production via tape casting. The influence of quartz content (10 – 50 vol%), sintering temperature (1300 or 1400 °C), and pore formers (graphite or PMMA) on membrane properties were studied. Without pore formers, open porosity and water permeance were considerably improved just by increasing quartz content. Adding PMMA or graphite more than doubled porosity at lower quartz content, increasing water permeance almost 13- and 22-fold, respectively. Membranes with ∼60 % porosity and water permeances of 1926–2646 L·m^-2·h^-1·bar^-1 were obtained at 1300 °C using graphite. This study shows that adjusting slurry composition and sintering temperature enables the production of low-cost kaolinite-based membranes with tailored properties, expanding their applications in separation processes while reducing costs and environmental impact.

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以高岭土和石英为原料，采用不同的成孔剂，通过带铸法制备低成本的陶瓷膜

陶瓷膜具有高热、化学和机械稳定性、长寿命和高亲水性。然而，它们的高成本限制了它们的广泛使用，凸显了对低成本替代品的需求。本研究评估了高岭土和石英用于带式铸造陶瓷膜的性能。研究了石英含量（10 ~ 50 vol%）、烧结温度（1300 ~ 1400℃）和成孔剂（石墨或PMMA）对膜性能的影响。在没有成孔剂的情况下，增加石英含量可以显著提高孔隙度和渗透率。在石英含量较低的情况下，添加PMMA或石墨的孔隙度增加了一倍以上，渗透率分别增加了近13倍和22倍。在1300℃下，用石墨制备的膜孔隙率为~ 60%，水渗透率为1926 ~ 2646 L·m-2·h-1·bar-1。该研究表明，调整浆料组成和烧结温度可以生产具有定制性能的低成本高岭石基膜，扩大其在分离过程中的应用，同时降低成本和环境影响。

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