Effective dye removal is of crucial importance for the well-being of the environment and human health, and hydrogels are top-players for this goal. In this work, hydrogels of polyacrylamide grafted onto chitosan, cross-linked with N,N′-methylenebisacrylamide, were synthesized by conventional (CM) and microwave-assisted methods (MWM). The products were characterized by Fourier transform infrared spectroscopy, elemental analysis, scanning electron microscopy and swelling capacity. The developed hydrogels were evaluated as an adsorbent for the azo dye Acid Blue 113. MWM provided higher yield of the product with reduced reaction time when compared to the CM. The dye removal efficiency by MWM was slightly lower than that observed by CM, but MWM showed a much higher maximum adsorption capacity than the conventional one. The adsorption behavior of conventional and MW hydrogels followed the Langmuir and Freundlich models, respectively. The MW hydrogel presented the best characteristics to be used as an adsorbent of the AB 113 dye.

有效去除染料对于环境和人类健康至关重要，而水凝胶是实现这一目标的首要因素。在这项工作中，接枝到壳聚糖上的聚丙烯酰胺水凝胶与N，N交联通过常规（CM）和微波辅助方法（MWM）合成了′-亚甲基双丙烯酰胺。通过傅里叶变换红外光谱，元素分析，扫描电子显微镜和溶胀能力对产物进行表征。已开发的水凝胶被评估为偶氮染料酸性蓝113的吸附剂。与CM相比，MWM可提供更高的产物收率并缩短了反应时间。MWM的染料去除效率略低于CM，但MWM的最大吸附能力比常规方法高得多。常规和中性水凝胶的吸附行为分别遵循Langmuir和Freundlich模型。MW水凝胶具有最佳性能，可用作AB 113染料的吸附剂。