石墨烯氧化物对吸附的研究:平衡,运动和热力学研究
Mehmet Fatih Önen1, Nalan Erdöl Aydin1, Osman Eksik2
1Department of Chemical Engineering, Faculty of Chemical and Metallurgical Engineering, İstanbul Technical University, İstanbul, Turkey.
Turkish journal of chemistry
|August 2, 2023
概括
石墨烯氧化物有效吸附,在pH值为6时具有最佳性能. 这项研究详细介绍了石墨烯氧化物的合成和吸附特性,以去除,强调其自发和内热性质.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 纳米技术纳米技术
背景情况:
- 氧化石墨烯是一种有前途的碳材料,具有重要的工业应用.
- 合成高纯度氧化石墨烯的高效方法对于其利用至关重要.
- 了解氧化石墨烯的吸附特性是其环境应用的关键.
研究的目的:
- 通过修改的汉默斯方法合成石墨烯氧化物.
- 为了研究石墨烯氧化物的吸附性质,以去除.
- 确定在石墨烯氧化物上吸附的最佳条件和机制.
主要方法:
- 通过修改的汉默斯方法合成石墨烯氧化物.
- 合成的氧化石墨烯的特性.
- 在不同的pH条件下进行的吸附实验.
- 分析吸附数据,使用兰迈尔等温和和伪二次运动模型.
- 吸附过程的热力学分析.
主要成果:
- 纯石墨烯氧化物已成功合成和表征.
- 对石墨烯氧化物的吸附高度依赖pH值,最大吸附发生在pH值6 (0.98 mg-1).
- 兰慕尔的吸附能力被确定为3.92 mg g-1 (R2 = 0.99).
- 吸附动力学遵循一个伪二阶模型 (R2 = 0.99).
- 热力学分析显示了自发和内热吸附过程 (ΔH° = 15.47 kJ mol-1).
结论:
- 修改后的 Hummers 方法对于生产纯氧化石墨烯是有效的.
- 石墨烯氧化物显示出从水溶液中去除的巨大潜力.
- 吸附过程由化学吸附控制,受pH值的影响,并表现出自发的内热特性.
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