电位法研究外加盐对壳聚糖树脂吸附苯甲酸的影响

利用电位法，跟踪观察交联壳聚糖树脂在不同环境体系吸附低浓度苯甲酸的行为，结合盐效应理论讨论了在三元体系(酸 水 盐)中，LiCl、NaCl、KCl、LiBr、NaBr、KBr、MgCl2、CaCl2、SrCl29种外加盐对交联壳聚糖树脂吸附苯甲酸吸附速率的影响．利用固一液界面吸附动力学方程，求取了表观速率常数(kt)．实验结果表明，交联壳聚糖树脂在三元体系中吸附苯甲酸，外加盐起盐析作用，使得其表观速率常数(kt)随着外加盐浓度的增大而增大．

THE EFFECT OF EXTERNAL- ADDED SALTS ON ADSORPTION OF BENZOIC ACID BY CHITOSAN RESIN WITH POTENTIOMETRIC METHOD

The behavior of adsorption of low concentration of benzoic acid by crosslinked chi-tosan resin in different circumstance systems is followed by potentionmetric method. With the salt effect theory, the influence of external- added salts (Lid, NaCl, KCl, LiBr, NaBr, KBr, MgCl2, CaCl2, SrCl2) concentration on adsorption rate of benzoic acid by crosslinked chitosan resin in trinal system (acid + water + salt) is discussed. The apparent adsorption rate constant (ki) is calculated by the solid - liquid interface dynamics equation. The experimental results show that the adsorption of benzoic acid in trinal system by crosslinked chitosan resin, the addition of salts serve as salting-out, the apparent adsorption rate constant(kt) is increased according with the concentration of external - added salts increased.