Water Purification of Dyes and Hardness Salts by Ceramic Membranes Modified with Silica and Pyrocarbon

Abstract

Modification of ceramic membranes was conducted with silica, obtained from liquid glass, and pyrocarbon from carbonized polyisocyanate and sucrose at 800°C. Water from Ca²⁺ and direct scarlet dye was purified by a pressure-driven method at 0.7 and 1.1–1.2 MPa. The retention coefficient of Ca²⁺ and specific productivity of the modified membranes depending on filtration time decreased respectively from 63 to 8% and from 150 to 4.7 dm3/(m².h). For direct scarlet dye, the retention factor constitutes 99.0 and 99.9% at the specific productivity respectively 27 and 1.8 dm3(m².h).