STUDY OF ADSORPTION OF PAPERMAKING ANIONIC TRASH MODEL BY HYDROTALCITE AND ITS CALCINED PRODUCT

摘要

Mg–Al–CO3 hydrotalcite (HT) with Mg/Al molar ratio of 2:1 was prepared by co-precipitation method, and its calcined product (CHT) was obtained by calcining at 500 °C. The adsorption kinetics and adsorption isotherms of BA by HT and CHT were analyzed, and the impacts of adsorbent dosage and adsorption temperature on equilibrium adsorption quantities were studied. The results indicated that kinetic data of the adsorption of BA by HT and CHT under an ambient temperature of 293 K could be fitted by pseudo-second-order equation well. It was found that the adsorption isotherms obeyed the Freundlich equation. The equilibrium adsorption quantities of BA by HT and CHT gradually decreased with the increase of adsorbent added. The values of thermodynamic parameter (ΔH°) indicated that the adsorption of BA was endothermic on HT and was exothermic on CHT.