Omidi Sakineh, Kakanejadifard Ali
Faculty of Science, Department of Chemistry, Lorestan University Khorramabad Iran
RSC Adv. 2018 Mar 28;8(22):12179-12189. doi: 10.1039/c8ra00510a. eCollection 2018 Mar 26.
A simple approach was utilized to synthesize graphene/chitosan-based hydrogel using glutaraldehyde as crosslinking agent in room temperature. The composite aerogel was used for removal of cationic and anionic dyes from aqueous solution. It showed high adsorption capacity towards Congo red as an anionic dye. Adsorption experiments were performed based on various parameters, such as initial Congo red concentration, solution pH and contact time. The kinetics data were analyzed using four different models and the pseudo-second-order model best described the adsorption of Congo red aerogel. The Equilibrium adsorption isotherm data indicated that equilibrium data were fitted to the Langmuir isotherm. The maximum dye adsorption capacity calculated from the Langmuir isotherm equation was 384.62 mg g. Moreover, the aerogel was stable and easily recovered, and adsorption capacity was about 100% of the initial saturation adsorption capacity after being used three times.
采用一种简单的方法，以戊二醛为交联剂，在室温下合成了石墨烯/壳聚糖基水凝胶。该复合气凝胶用于从水溶液中去除阳离子和阴离子染料。它对作为阴离子染料的刚果红表现出高吸附容量。基于各种参数进行了吸附实验，如刚果红初始浓度、溶液pH值和接触时间。使用四种不同模型分析动力学数据，准二级模型最能描述刚果红气凝胶的吸附过程。平衡吸附等温线数据表明平衡数据符合朗缪尔等温线。由朗缪尔等温线方程计算出的最大染料吸附容量为384.62 mg/g。此外，该气凝胶稳定且易于回收，使用三次后吸附容量约为初始饱和吸附容量的100%。
