交联壳聚糖对偶氮染料的脱色研究
关键词：壳聚糖；改性；膜；偶氮染料；吸附
Study on Sorption of Azo Dyes by Crosslinked Chitosan Membrane
Abstract：Printing and dyeing wastewater is a kind of industry wastewater to be hardly treated with the characteristics of high chroma and changeful colour.The industrialized way is acombinative method with flocculation and biology.So flocculantion plays an important partin dealing with . Chitosan had good flocculating effect to many kinds of dyes because ofits special molecular structure. Under the condition of different dye concentration, PH，salt content and temperatures , adopting the spectrophotometrically to measure adsorb after the concentratiaon of the dye , the authors got the best condition of adsorbing the chitosan for acid dye .The results show that under the condition of fixedly the dye concentration and physical volume,the amount of devotion of the chitosan the adsorb was the best under the glutaric dialdehyde of 0.6 mL,PH was worth to 6,temperature for indoor temperature,time of absorb 1.5.Solution PH and degree of cross linking have great influence on the adsorption, but have very little influence of NaCl concentration and temperature on adsorption.The complex structure of dyes, the decolorization effect is poor.The result would be made use of the chitosan to treat the printing dye the waste water to provide the certain theories basis.This paper studied the synthesis of modified chitosan andits application in printing and dyeing wastewater.
Key words：Chitosan ; Modifying ; Membrane ; Azo Dyes ; Adsorption
目 录
摘 要 1
Abstract 1
引言 2
1. 实验材料与仪器 3
1.1实验材料 3
1.2实验仪器 3
2．实验方法 3
2.1实验所采用的偶氮染料 3
2.1.1 甲基橙 3
2.1.2 酸性大红 4
2.2偶氮染料溶液标准曲线的绘制 4
2.2.1 酸性大红溶液标准曲线的绘制 4
2.2.2 甲基橙溶液标准曲线的绘制 5
2.3实验所需标准溶液的配制 5
2.4壳聚糖膜的制备 6
2.5交联壳聚糖膜的制备 6
2.6偶氮染料脱色试验 6
2.6.1 交联度对偶氮染料吸附作用的影响 6
2.6.2 时间对偶氮染料吸附作用的影响 6
2.6.3 温度对偶氮染料吸附作用的影响 7
2.6.4 PH对偶氮染料吸附作用的影响 7
2.6.5 盐浓度对偶氮染料吸附作用的影响 7
3. 结与讨论 7
参考文献 10
致谢 13
交联壳聚糖对偶氮染料的脱色研究 引言
日益严重的印染废水污染已经成为制约我国经济建设和影响人民生活的显著问题，因此得到人们的普遍关注。染料废水由于其高COD、高色度、有机成分复杂、微生物降解程度低等诸多特点，一直是工业废水处理中的一大难题。治理染料废水行之有效的途径是：先通过物理化学方法进行预处理脱色，去除生物毒性大、色度高的染料分子，提高废水的可生化性，然后通过后续生化处理，达到综合治理的目的。其中作为染料废水预处理的物理化学处理是十分关键的。在物理处理法中应用最多的是吸附法，目前工业上使用较多的吸附剂是粒状活性炭、活性硅藻土和树脂。研究表明，活性炭是大部分染料的最好吸附剂，但其再生困难，使用成本高。美国、日本等发达国家已经开始研究利用壳聚糖作为絮凝剂进行污染废水的净化处理[1~2]，达到了高效而经济地消除印染废水的污染。而我国仍采用无机盐及无机高分子絮凝剂等传统方法进行处理，方法在一定程度上对解决我国现实印染废水污染问题上与世界前沿的发展水平很难同步。