Preparation of Tannin-immobilized Collagen/Cellulose Bead for Pb(II) Adsorption in Aqueous Solutions

Abstract

Bayberry tannin-immobilized collagen/cellulose bio-adsorbent (BTcollagen/cellulose) was prepared via the reaction of bayberry tannin with the amino group of collagen in collagen/cellulose blends. Compared with collagen/cellulose beads without tannin, BT-collagen/cellulose had a more compact structure and higher thermal stability. Furthermore, the crystalline structure of cellulose in BT-collagen/cellulose was preserved. The adsorption properties of BT-collagen/cellulose to Pb(II) in aqueous solution were investigated and compared with those of collagen/cellulose. The adsorption of Pb(II) on both of the two bioadsorbents reached the maximum at pH near 5.5. Based on the mass content of collagen, the equilibrium adsorption capacity of BTcollagen/cellulose at 25 °C was 1.352 mmol/g, according to Langmuir isotherms, which was higher than that of collagen/cellulose (0.345 mmol/g). In kinetics studies, both of the two bio-adsorbents reached equilibrium within ~240 min, and the experimental data could be well fitted by the pseudo-second-order rate model. Nevertheless, BTcollagen/cellulose had a better reusability after three cycles of adsorption-desorption.

Regenerated Lignocellulose Beads Prepared with Wheat Straw

“…They are currently used in many advanced applications, such as chromatography, metal ion adsorption, protein immobilization, and retarded drug release (Gericke et al 2013;Luo and Zhang 2013;Zhang et al 2015). However, the production of cellulose beads is costly and not environmentally friendly, despite the fact that the raw material, cellulose, comes from cotton or is separated from lignocelluloses.…”