二苯基甲烷二异氰酸酯改性β-环糊精吸附性能

Adsorption behavior of β-cyclodextrin modified with diphenyl methane diisocyanate

以二苯基甲烷二异氰酸酯(MD I)为交联剂、对β-环糊精(-βCD)进行修饰改性,制得吸附剂二苯基甲烷二异氰酸酯-β-环糊精(MD I--βCD),并用于吸附处理苯酚废水。采用红外光谱(IR)及扫描电镜(SEM)对交联产物进行表征,结果发现,所得的交联产物即为目标产物。考察了振荡时间、溶液pH值,吸附温度、聚合物MD I-β-CD用量以及苯酚溶液初始质量浓度对苯酚吸附性能的影响。结果表明:温度20℃,振荡时间40 m in,pH值3—7,聚合物用量40 mg/mL,吸附质量比能达到18.1 mg/g。该吸附剂具有吸附能力强、无二次污染、环境友好等优点,在处理酚类废水领域发挥重要作用。

The adsorbent,diphenyl methane diisocyanate-β-cyclodextrin（MDI-β-CD） synthesized by the modification of β-cyclodextrin（β-CD） with crosslinking reagent diphenyl methane diisocyanate（MDI）,was used in the treatment of phenol-containing wastewater.Infrared spectroscopy（IR）,scanning electron microscopy（SEM） techniques were used to characterize the cross-linked polymer.The results suggest that the final product is target product.The influence of adsorption conditions of adsorption time,pH value of solution,adsorption temperature,the amount of cross-linked polymer and initial phenol mass concentration on adoption capacity were investigated.The results indicate that the adsorption capacity（mass ratio） is up to 18.1 mg/g with the amount of cross-linked polymer of 40 mg/mL in 40 min,the initial phenol mass concentration 200 mg/L,wastewater pH 3-7,and temperature 20 ℃.It has more excellences such as strong phenol adsorption,no secondary pollution,environment-friendly and plays an important role in the treatment of phenol-containing wastewater.