酸洗海藻酸盐碳气凝胶的制备及染料吸附特性研究

Preparation and Dye Adsorption Properties of Pickling Alginate Carbon Aerogel

本研究以海藻酸钠为原材料经过湿法纺丝、交联、碳化、酸洗四步制备碳气凝胶材料,该碳气凝胶对阳离子染料亚甲基蓝、阴离子染料甲基橙展现出良好的吸附性能。研究了吸附剂投加量、吸附时间和初始浓度对染料吸附效果的影响。实验结果表明:随着碳气凝胶投加量的增加,溶液中两种染料的去除率增加,吸附量减小;碳气凝胶对两种染料的吸附过程符合准二级动力学模型(R2 >0.999)以及Langmuir等温吸附模型,说明碳气凝胶对两种染料的吸附主要是化学吸附和单分子层吸附。碳气凝胶对亚甲基蓝、甲基橙的吸附量分别为196.38 mg/g、187.44 mg/g。

Carbon aerogels prepared with sodium alginate as raw material after wet spinning, cross linking, carbonation, pickling present excellent adsorption performance for cationic dye methylene blue and anionic dye methyl orange. The influence of adsorbent dosage, adsorption time and initial concentration during in the process of dye adsorption for carbon aerogels were explored by ad-sorption experiments. The dye removal rate was increased and the adsorption capacity was de-creased with the increase of carbon aerogel dosage. The experimental results show that the two dyes adsorption processes of carbon aerogel conform to the pseudo-secondary dynamics model (R2 >0.999) and the Langmuir model. It is indicated that the type of carbon aerogel dye adsorption was mainly chemical adsorption and monolayer adsorption. Adsorption capacity of carbon aerogel for methylene blue and methyl orange was 196.38 mg/g, 187.44 mg/g, respectively.