Title
Preparation and adsorption studies of phosphorylated cellulose microspheres
Authors
DANA M. SUFLET IRINA POPESCU and IRINA M. PELIN

Received November 1, 2015
Published Volume 51 Issue 1-2 January-February
Keywords cellulose phosphate, microspheres, adsorption kinetics

Abstract
New anionic microspheres based on monobasic cellulose phosphate were obtained by chemical cross-linking with epichlorohydrin, using the water-in-oil inverse emulsion technique. SEM and FTIR spectroscopy were used to analyse the morphology and chemical structure of the microspheres. The main characteristics, such as the wrack density, swelling degree, and the exchange capacity, were investigated. These new anionic microspheres could be used as potential adsorption materials. In this respect, the adsorption capacity of methylene blue and rhodamine 6G taken as models was studied. The Langmuir model fitted the adsorption data better than the Freundlich model. Moreover, the kinetic adsorption data were in close agreement with the pseudo-second order kinetic model, which supported the assumption that dye adsorption occurs by physical interactions. Intra-particle and Boyd’s models suggested that the intra-particle diffusion was not only a rate-controlling process, but also the film diffusion process played some role in the adsorption on the monobasic cellulose phosphate microspheres.