Abstract
Highly porous cellulose microbeads with porosity of more than 90% were successfully prepared via a facile dissolution and subsequent regeneration of cellulose in H2SO4/Na2SO4 coagulation bath. Effects of coagulation temperature, H2SO4, and Na2SO4 concentration on the microstructure, average diameter, porosity, specific surface area, and mechanical property of formed cellulose beads were investigated systematically. In view of the high porosity and specific area, the cellulose beads were used as adsorbents for dye removal. The results revealed that the porous cellulose beads exhibited high adsorption performance with maximum adsorption capacity of 48.80 mg/g for cationic dye methylene blue. Besides, the porous cellulose beads also presented a potential in practical application and its adsorption capacity for methylene blue still retained 29.43 mg/g after six adsorption-desorption cycles.
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