水杨醛改性壳聚糖对氯酚的吸附性能

李海虹;张文君

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科技导报 ›› 2010, Vol. 28 ›› Issue (14) : 101-104.

研究论文

水杨醛改性壳聚糖对氯酚的吸附性能

李海虹;张文君

作者信息 -

淮海工学院化学工程学院，江苏连云港 222005

Salicylaldehyde-modified Chitosan's Property of Adsorption to Chlorophenols Compounds

Author information -

摘要

为了更有效解决有机污染物2,4-二氯酚对水资源污染的严重问题，对水杨醛改性壳聚糖的合成和改性壳聚糖吸附2,4-二氯酚的性能进行了研究，并对比了改性壳聚糖与未改性壳聚糖的吸附能力。介绍了改性壳聚糖的合成方法，对改性壳聚糖（CTS）产物的结构用红外光谱法进行表征，并利用紫外光谱法研究其对2,4-二氯苯酚的吸附性能。考察了pH值、时间、酚浓度等因素对吸附性能的影响。结果表明，经水杨醛改性后的壳聚糖对2,4-二氯苯酚具有更良好的吸附性能；改性壳聚糖在吸附时间2h以上，溶液pH值为5时的吸附效果最好；吸附符合Langmuir吸附等温方程；吸附动力学符合Lagergren二级吸附速率方程。

Abstract

Waste water with phenol is very harmful to the health of human beings. In order to effectively solve the serious problem of 2,4-dichlorophenol's pollution to water resources, the salicylaldehyde-modified chitosan's synthesis and its property of adsorption to 2,4-dichlorophenol are studied. A comparison of the adsorption ability between the modified chitosan and the un-modified chitosan is made. The synthesis method of salicylaldehyde-modified chitosan is discussed. The structure of the modified chitosan is characterized by FT-IR. The adsorption of 2,4-dichlorophenol by the modified chitosan is investigated by the UV spectrum method. The effects of pH value, time and concentration of phenol on adsorption property are analyzed. It is shown that the modified chitosan has better adsorption property than the un-modified chitosan. The adsorption ability is improved from 26.8mg/g of the un-modified chitosan to 38.7mg/g of the modified chitosan. The modified chitosan has the best adsorption effect when the adsorption time is above 2h and pH value of the solution is 5. With the increase of the concentration of phenol, the adsorption capacity is increased near linearly. After 50 minutes, the adsorption capacity of the modified chitosan approaches almost saturation. When the mass of the modified chitosan is above 0.5g, the adsorption capacity reaches the maximum. The adsorption property fits well with the Langmuir isotherm adsorption equation. The adsorption kinetics fits well with the second-order dynamic model.