Methylene blue adsorption on graphene oxide/calcium alginate composites
Methylene blue adsorption on graphene oxide/calcium alginate composites
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DOI：
10.1016/j.carbpol.2013.01.094
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发表时间：
2013-05-05
影响因子：
11.2
通讯作者：
Xia, Linhua
中科院分区：
文献类型：
--
作者：
Li, Yanhui;Du, Qiuju;Xia, Linhua
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以及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。本研究制备了一种新型环保吸附剂——海藻酸钙固定化氧化石墨烯复合材料。研究了pH、接触时间、温度和用量对海藻酸钙固定氧化石墨烯复合材料吸附亚甲基蓝性能的影响。平衡吸附数据由 Langmuir 和 Freundlich 等温线描述。由Langmuir等温方程得出的最大吸附容量为181.81 mg/g。使用准一级、准二级和颗粒内扩散方程来评估动力学数据。平衡热力学分析表明，亚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且自发的。 (c) 2013 Elsevier Ltd. 保留所有权利。
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. (c) 2013 Elsevier Ltd. All rights reserved.