甲壳素对碱性橙Ⅱ染料吸附条件及机理的研究

Study on adsorption conditions and mechanism of chitin on basic orange Ⅱ

研究了pH对初加工甲壳素(A)和商品甲壳素(B)吸附性能的影响,通过加入电解质NaCl和表面活性剂十二烷基硫酸钠(SDS)探究了p H影响甲壳素吸附性能的原因,并对吸附机理做了初步探讨。结果表明:甲壳素A和甲壳素B在pH 4.0时对碱性橙Ⅱ吸附效果最佳;加入0.1 mol/L NaCl后,在低pH条件下会对甲壳素与碱性橙Ⅱ之间的静电作用产生一定影响;加入0.01 mol/L SDS后,甲壳素A的吸附效果不受pH的影响,而pH对甲壳素B吸附效果的影响基本不变。静电吸引、氢键和疏水作用是甲壳素吸附碱性橙Ⅱ的几种作用力,随着pH的改变,其主要作用力会发生变化。

The effect of pH on the adsorption performance of primary processed chitin( A) and commercial chitin( B) were studied. The reason of p H affecting the adsorption performance of chitin was investigated by adding electrolyte( NaCl) and surfactants( SDS),and the adsorption mechanism was preminarily discussed.The results showed that chitin A and chitin B presented the best adsorption capacity for basic orange Ⅱ at pH4. 0. In the presence of 0. 1 mol/L NaCl,effect on the electrostatic interaction between the chitins and basic orange Ⅱ was observed at low pH. Upon adding 0. 01 mol/L SDS,chitin A displayed no pH dependence on the adsorption of basic orange Ⅱ,while the adsorption capacity of chitin B for the dye was still p H dependent.Electrostatic attraction,hydrogen bonding and hydrophobic interaction were the forces involved in the adsorption of chitin for basic orange II,the main force varied with different pH values.