石墨烯氧化物/醋酸纤维素复合材料对水溶液中阳离子染料的吸附去除。
Adsorptive Removal of Cationic Dye from Aqueous Solution by Graphene Oxide/Cellulose Acetate Composite.
机构信息
State Key Laboratory of Biopolysaccharide Fibers and Ecological Textiles, Qingdao University, Qingdao 266071, China.
Shandong University & Rice Joint Center for Carbon Nanomaterials, Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan 250061, China.
出版信息
J Nanosci Nanotechnol. 2019 Aug 1;19(8):4535-4542. doi: 10.1166/jnn.2019.16632.
The application of graphene oxide in water treatment is facing a rigorous challenge of how to separate nanoadsorbents from aqueous solution using conventional methods after adsorption. Herein, a new type of easily separated composite was fabricated using cellulose acetate (CA) crosslinked with graphene oxide (CAGO) and a simple vacuum freeze-drying method. The CAGO composites were subject to SEM, FTIR, TGA, and BET characterizations. The adsorption performance of the adsorbent for the removal of methylene blue (MB) was evaluated through investigating the experimental parameters such as initial dye concentration, temperature, adsorbent dose, contact time, and solution pH. The Langmuir and Freundlich isotherm models were applied to fit the equilibrium data. The maximum adsorption capacity of methylene blue onto the CAGO-4 composite was 374.53 mg/g at 323 K. The kinetic data showed a good determination with pseudo-second-order equation. Thermodynamic analysis indicated that the adsorption was an endothermic and spontaneous process.
氧化石墨烯在水处理中的应用面临着一个严峻的挑战，即在吸附后如何使用传统方法从水溶液中分离纳米吸附剂。在此，使用氧化石墨烯（GO）交联的醋酸纤维素（CA）和简单的真空冷冻干燥法制备了一种新型的易于分离的复合材料。对 CAGO 复合材料进行了 SEM、FTIR、TGA 和 BET 表征。通过考察初始染料浓度、温度、吸附剂剂量、接触时间和溶液 pH 等实验参数，评估了吸附剂对亚甲基蓝（MB）去除的吸附性能。采用 Langmuir 和 Freundlich 等温模型拟合平衡数据。在 323 K 时，CAGO-4 复合材料对亚甲基蓝的最大吸附容量为 374.53 mg/g。动力学数据与准二级方程具有良好的相关性。热力学分析表明，吸附是一个吸热和自发的过程。
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