PAN-DCD用于染料废水的脱色研究

本文以聚丙烯腈为高分子链,用双腈双胺与聚丙烯腈大分子上的腈基改性,制得含有多种活性基团的聚合物PAN-DCD.研究了PAN-DCD对活性染料、分散染料及酸性染料废水的脱色效果,并初步探讨了其脱色机理.实验结果表明,PAN-DCD的脱色效果与染料的种类、废水的酸度以及脱色剂的用量有关.PAN-DCD对染料颜色的去除率在pH=3.0和pH=13.0时达到极大值,显示了它的两性特征.脱色机理的研究结果表明,聚合物分子中的胍胺结构与染料分子发生了化学作用,通过静电键和分子间氢键的形成以及聚集作用,将分布于水中的有色物质絮凝、沉降.

STUDY ON DECOLORATION OF THE WASTEWATER CONTAINING DYE WITH PAN-DCD

The polymer PAN-DCD containing several active groups is prepared by reaction of polyacrylonitrile with dicyandiamide.and is used to treat wastewater containing single dye. The experimental results show that the efficiency of decoloration with PAN-DCD relates to the type of dyes and depends on the pH value of wastewater and the dosages of PAN-DCD. It shows the polyampholytic properties of PAN-DCD that the color removal ratio is risen to a maxima when the pH value of wastewater is equal to either 3. 0 or 13. 0. The mechanism of decolorization reaction indicates that the chemical reaction of the dye(K-2BP) in the wastewater with cyanoguanidine in PAN-DCD structure occurs by electrostatic bonding and hydrogen bonding. The bonding and aggregation lead to flocculation and sedimentation of the dyes in wastewater.