N-羧甲基壳聚糖/纳米TiO2复合材料的制备与性能

Preparation and Properties of Carboxymethyl Chitosan/Titanium Dioxide Composite Material

以壳聚糖、氯乙酸为主要原料合成了N-羧甲基壳聚糖,通过溶胶-凝胶法制备得到了N-羧甲基壳聚糖/纳米TiO2复合材料。利用红外（IR）、x-射线衍射（XRD）、扫描电镜（SEM）对复合材料进行了表征,并考察了复合材料对亚甲基蓝溶液、亚甲基绿溶液、1,9-二甲基亚甲基蓝的降解性能,探讨了溶液的初始浓度、pH值、复合材料掺杂比及煅烧温度等因素对降解率的影响。实验研究发现,煅烧温度为300℃、掺杂比为2∶5的复合材料在温度30℃下,对初始浓度为8 mg/L,pH=9的3种染料分子溶液的降解效果最好,降解率分别为90.62%、83.75%、95.16%。

N-carboxymethyl chitosan was prepared by using chitosan and chloroacetic acid as the main raw material,and then carboxymethyl chitosan/titanium dioxide composite materials was prepared using sol-gel technolgy.Infrared spectrum（IR）,X-ray diffraction（XRD）and Scanning Electron Microscope（SEM）techniques were used to characterize the N-carboxymethyl chitosan/titanium dioxide composite material.The photocatalysis tests of N-carboxymethyl chitosan/titanium dioxide composite materials for Methylene blue solution,methylene green solution and 1,9 dimethyl methylene blue were investigated.The results of the experiment show that：the composite material with doping ratio 2：5 and calcination temperature 300 ℃ has a very high photocatalytic activity for three solution,and the photocatalysis degradation rates of the three solution are 90.62%,83.75% and 95.16%.