Positively charged microporous ceramic membrane for the removal of Titan Yellow through electrostatic adsorption

摘要

To develop a depth filter based on the electrostatic adsorption principle, positively charged microporous ceramicmembranewas prepared froma diatomaceous earth ceramic membrane. The internal surface of the highly porous ceramic membrane was coated with uniformly distributed electropositive nano-Y2O3 coating. The dye removal performance was evaluated through pressurized filtration tests using Titan Yellow aqueous solution. It showed that positively chargedmicroporous ceramicmembrane exhibited a flowrate of 421 L/(m(2).hr) under the trans-membrane pressure of 0.03 bar. Moreover it could effectively remove Titan Yellow with feed concentration of 10 mg/L between pH 3 to 8. The removal rate increased with the enhancement of the surface charge properties with a maximum rejection of 99.6%. This study provides a new and feasible method of removing organic dyes in wastewater. It is convinced that therewill be a broad market for the application of charged ceramicmembrane in the field of dye removal or recovery from industry wastewater. (C) 2016 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.