复合功能吸附树脂对双组分萘系化合物的竞争吸附研究

1-氨基 -2 -萘酚 -4 -磺酸 ( 1,2 ,4-酸 )和 2 -萘酚自不同双组分吸附体系中吸附至复合功能吸附树脂 AL -1上的吸附等温线符合 F reundlich等温模型。1,2 ,4-酸的吸附为吸热过程 ,而 2 -萘酚的吸附为放热过程。固相上的 2 -萘酚几乎不影响 1,2 ,4-酸的吸附 ,而固相上的 1,2 ,4-酸大大削弱了 2 -萘酚的吸附。两种溶质在吸附位点上的竞争为主要作用机制。

Competitive adsorption of binary naphthalene compounds onto a bi-functional polymeric adsorbent

A bi-functional polymeric adsorbent AL-1 is used to study the competitive adsorption mechanism. The adsorption isotherms for 1-amino-2-naphthol-4-sulfonic acid (1,2,4-acid) and 2-naphthol obtained from various binary adsorption environment can be well fitted by Freundlich equation, which indicates a favorable adsorption process for the studied cases. Adsorption for 1,2,4-acid is an endothermic process in comparison with that for 2-naphthol of an exothermic process. 2-naphthol molecules put a little influence on the adsorption capacity for 1,2,4-acid. However, the adsorption of 1,2,4-acid depressed that of 2-naphthol in a large extent for the stronger electrostatic interaction between 1,2,4-acid and adsorbent which causes the prior adsorption performance toward 1,2,4-acid. The predominant mechanism can be attributed to the competition for adsorption sites.;