ABSTRACT

In this work, we have reported the preparation of a flat circular ceramic membrane (53 mm diameter and 5 mm thick) by paste casting method from locally available Kashmir clay. The membrane was obtained by sintering the clay disc at 850^oC for 5 h. The raw material and the membrane were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), porosity, and pure water permeability. The XRF and XRD analysis of the clay confirmed the presence of components required for ceramic membrane preparation. Average pore size, apparent porosity, and pure water permeability of the membrane was obtained as 5.88 µm, 24.30%, and 0.9865 l.m^–2.h^–1.kPa^–1, respectively. Chemical stability was carried out by keeping the membrane in HCl (pH=1) and NaOH (pH=14) solutions for one week. The prepared membrane showed excellent chemical resistance in both the media. The overall fabrication cost of the membrane was estimated as 301 $/m². These results indicate that the clay used in this work could serve as an alternative raw material to kaolin based ceramic microfiltration membranes for cheaper use in different chemical and biochemical processes.

摘要

在这项工作中，我们报道了通过浆糊浇铸法从当地可得的克什米尔粘土中制备平坦的圆形陶瓷膜（直径53毫米，厚5毫米）。该膜是通过将黏土盘在850 ^o C烧结5 h来获得的。通过X射线荧光（XRF），X射线衍射（XRD），热重分析（TGA），傅里叶变换红外（FTIR）光谱，扫描电子显微镜（SEM），孔隙率，和纯净的水渗透性。粘土的XRF和XRD分析证实了陶瓷膜制备所需组分的存在。膜的平均孔径，表观孔隙率和纯水渗透率分别为5.88 µm，24.30％和0.9865 lm ^–2 .h ^–1 .kPa分别为^–1。通过将膜在HCl（pH = 1）和NaOH（pH = 14）溶液中放置1周来实现化学稳定性。所制备的膜在两种介质中均显示出优异的耐化学性。膜的总制造成本估计为301 $ / m ²。这些结果表明，在这项工作中使用的粘土可以作为高岭土基陶瓷微滤膜的替代原料，在不同的化学和生化过程中可以更便宜地使用。