title: Preparation and application of cellulose triacetate microspheres.
abstract: Cellulose triacetate was prepared via reacting of a mixture of acetic anhydride and acetic acid containing sulfuric acid as catalyst with ramie fiber obtained from a biomass of ramie. The cellulose triacetate with a degree of substitution (DS) 2.93 of the ramie fiber was obtained. The honeycomb-like cellulose triacetate microspheres with an average diameter of 14 microm were made from the cellulose triacetate solution. The optimum conditions for preparing the microspheres were determined as cellulose triacetate/dichloromethane ratio 1:7 (w/w), and 0.75% sodium dodecylsulfonate. The cellulose triacetate microspheres were characterized using FT-IR, NMR, XRD, and SEM. Application of the microspheres as an adsorbent for removing disperse dyes in water was investigated under the temperatures from 15 to 50 degrees C, pHs from 4 to 9, and the weight of cellulose triacetate microspheres from 0.03 to 0.09 g. The cellulose triacetate microspheres exhibited a 16.5mg/g capability to remove DR dye from water at 50 degrees C and pH 7.
authors.affiliation: School of Chemistry & Materials Science, Shaanxi Normal University, Xi'an 710062, PR China.
authors.forename: Xiushan
authors.initials: X
authors.lastname: Fan
authors.forename: Zhao-Tie
authors.initials: ZT
authors.lastname: Liu
authors.forename: Zhong-Wen
authors.initials: ZW
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D002482:Cellulose / Q000031:analogs & derivatives / Q000138:chemical synthesis; D004396:Coloring Agents / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D008863:Microspheres; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D004396:Coloring Agents; D014874:Water Pollutants, Chemical; D002482:Cellulose; C024671:cellulose triacetate