Comparative and Equilibrium Studies on Anionic and Cationic Dyes Removal by Nano-Alumina-Doped Catechol Formaldehyde Composite

摘要

Nano-alumina-doped catechol formaldehyde polymeric composite was prepared,characterized,and applied as an adsorbent for the removal of an anionic dye Congo red(CR)and a cationic dye SafraninO(SF),by adsorption process especially from aqueous solutions.Characterizations such as particle size distribution,zeta potential,BET,FTIR,and FESEM-EDAX were carried out for the adsorbent prepared.All experiments were conducted at the batch condition to study the effects of initial dye concentration(CR: 30-90 mg/L and SF: 10-50 mg/L),pH(2-11),temperature(25-55℃),and adsorbent dosage(0.05-0.3 g)on dye removal.The isotherm models(Langmuir,Freundlich,and Temkin)were analyzed for this adsorption work.The kinetic data obtained were analyzed by the pseudo-first-order,pseudo-second-order,Bangham,and Chien-Clayton equations.Dyes adsorption data were well fitted with the Freundlich isotherm equilibrium model and the pseudo-second-order kinetic model.Study results suggested that the nano-alumina-polymeric composite could be an effective adsorbent for anionic dye rather than cationic dye.