Laboratory of Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, College of Electromechanical Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, PR China.
Carbohydr Polym. 2013 Jun 5;95(1):501-7. doi: 10.1016/j.carbpol.2013.01.094. Epub 2013 Mar 4.
Graphene oxide has been used as an adsorbent in wastewater treatment. However, the dispersibility in aqueous solution and the biotoxicity to human cells of graphene oxide limits its practical application in environmental protection. In this research, a novel environmental friendly adsorbent, calcium alginate immobilized graphene oxide composites was prepared. The effects of pH, contact time, temperature and dosage on the adsorption properties of methylene blue onto calcium alginate immobilized graphene oxide composites were investigated. The equilibrium adsorption data were described by the Langmuir and Freundlich isotherms. The maximum adsorption capacity obtained from Langmuir isotherm equation was 181.81 mg/g. The pseudo-first order, pseudo-second order, and intraparticle diffusion equation were used to evaluate the kinetic data. Thermodynamic analysis of equilibriums indicated that the adsorption reaction of methylene blue onto calcium alginate immobilized graphene oxide composites was exothermic and spontaneous in nature.
氧化石墨烯已被用作废水处理中的吸附剂。然而，氧化石墨烯在水溶液中的分散性和对人体细胞的生物毒性限制了其在环境保护中的实际应用。在这项研究中，制备了一种新型的环保吸附剂，即海藻酸钙固定化氧化石墨烯复合材料。考察了 pH 值、接触时间、温度和剂量等因素对甲基蓝在海藻酸钙固定化氧化石墨烯复合材料上吸附性能的影响。用 Langmuir 和 Freundlich 等温线描述了平衡吸附数据。从 Langmuir 等温线方程得到的最大吸附容量为 181.81mg/g。用拟一级、拟二级和内扩散方程对动力学数据进行了评价。平衡的热力学分析表明，甲基蓝在海藻酸钙固定化氧化石墨烯复合材料上的吸附反应是放热和自发的。
