α与β构型壳聚糖对Fe(Ⅲ)鳌合差异及对染料的吸附研究

Differences of chelating performance between α and β chitosan for Fe(Ⅲ) and the adsorption on dye pollutant

以α及β两种构型的壳聚糖为研究对象,考察了其对Fe3+的鳌合性能差异,并制备了两种构型的壳聚糖-Fe(III)络合物吸附材料,用于染料污染物的吸附处理。研究结果表明,β-壳聚糖因分子链相互平行而分子间相互作用较弱,更易结合Fe3+,制得的壳聚糖-Fe(III)络合物吸附材料具有较好吸附性能,对于浓度为20 mg/L的染料污染物,5 min内即可达到吸附平衡,吸附容量可达578.88 mg/g。

α-chitosan and β-chitosan were selected as the research objects and their binding properties with Fe3 ＋were investigated. Additionally,chitosan-Fe（III） complexes with different configurations ofα-chitosan and β-chitosan were also prepared as adsorption material for the removal of dye contaminants. The results showed that the β-chitosan-Fe（III） complexes have better adsorption performance than α-structure because of the weaker interaction between molecular chains of β-chitosan. For dye contaminants with concentration of 20 mg/L,the adsorption equilibrium can be achieved within 5 min and the maximum adsorption capacity was 578. 88 mg/g according to the fitting of Langmuir-Freundlich adsorption model.