Chemical Engineering Department, Federal University of Santa Maria, UFSM, Roraima Avenue, 1000, 97105-900 Santa Maria, RS, Brazil.
Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Goncalves 9500, 91501-970 Porto Alegre, RS, Brazil.
Int J Biol Macromol. 2021 May 15;179:366-376. doi: 10.1016/j.ijbiomac.2021.02.179. Epub 2021 Feb 27.
A new alternative aerogel was prepared from low-cost chitin and psyllium biopolymers to adsorb crystal violet (CV) dye from liquid media and possibly treat effluents containing other dyes. The aerogel was characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM), which demonstrated that aerogel has a typical structure of amorphous materials and presented a randomly interconnected porous structure that resembles an open pore network. 2.5 g L of aerogel was able to remove 86.00% of CV from solutions, and the natural pH of the CV solution was considered the more adequate for adsorption. The pseudo-second-order (PSO) model satisfactorily described the adsorption kinetics, and the Freundlich model was suitable to represent the adsorption equilibrium. The maximum experimental capacity achieved was 227.11 mg g, which indicates that aerogel is very efficient and competitive with several adsorbents. Tests using a simulated effluent showed that aerogel has excellent potential to treat real colored effluents.
一种新型的气凝胶是由低成本的壳聚糖和芦丁生物聚合物制备的，用于从液体介质中吸附结晶紫 (CV) 染料，并可能处理含有其他染料的废水。气凝胶的特性通过 X 射线衍射 (XRD)、傅里叶变换红外光谱 (FTIR) 和扫描电子显微镜 (SEM) 进行了表征，结果表明气凝胶具有典型的无定形材料结构，并呈现出一种随机互联的多孔结构，类似于开放的孔网络。2.5 g/L 的气凝胶能够从溶液中去除 86.00%的 CV，并且 CV 溶液的自然 pH 值被认为更适合吸附。准二级 (PSO) 模型很好地描述了吸附动力学，而 Freundlich 模型适合表示吸附平衡。实验达到的最大容量为 227.11 mg/g，这表明气凝胶非常高效，与几种吸附剂具有竞争力。使用模拟废水进行的测试表明，气凝胶具有处理实际有色废水的巨大潜力。
