Abstract
Layered double hydroxides (LDHs) are excellent adsorbent for removal of organic and inorganic contaminates from water and wastewater. In this aspect, extrudates of LDHs are of great importance for water/wastewater treatment through fixed-bed column operations. The present study reports preparation of biopolymer modified LDH extrudates by one-pot co-precipitation and extrusion method for their effective application in column-based water/wastewater treatment systems. The microstructural properties of the LDH extrudates were studied by thermogravimetric analysis (TGA), X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FT-IR), scanning electron microscopy (SEM) and nitrogen adsorption-desorption analysis. The adsorption performance of the prepared LDH extrudates was studied through batch system and fixed-bed column experiments for the adsorption of acid orange II dye in aqueous medium. The adsorbent extrudates are found to be stable between a solution pH of 5 and 10. The adsorption kinetics followed a pseudo-second order kinetic model. These LDH-starch-cellulose extrudates found to be user friendly adsorbent for column-based water purification systems.
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