通过系统的修改来调整飞的结构性质,以进行增强的甲蓝去除:实验和计算调查
Zeynep Rana Çınar1, Sezer Eski1, Büşra Sekizkardeş1,2,3
1Department of Materials Science and Technology, Faculty of Science, Turkish-German University, Sahinkaya Cad., Beykoz, Istanbul 34820, Turkey.
Langmuir : the ACS journal of surfaces and colloids
|December 26, 2025
概括
这项研究优化了煤炭飞灰 (FA) 通过洗,酸处理和烧焦进行甲基蓝 (MB) 吸附. 修改后的FA显示了显著增强的MB吸收和可重复使用性,提供了新的应用.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 表面化学 表面化学
背景情况:
- 煤炭飞灰 (FA) 是一个巨大的工业副产品,其潜力未得到充分利用.
- 开发具有成本效益的吸附剂对于环境修复至关重要.
- 表面特性决定了吸附剂的性能.
研究的目的:
- 系统地修改煤炭飞灰 (FA),以提高其对污染物的吸附能力.
- 为了研究连续洗水,HCl消化和化对FA特性的影响.
- 优化FA用于甲基蓝 (MB) 吸附,并探索其可重复使用性.
主要方法:
- 顺序处理FA:水洗,HCl消化 (2-6M),烧焦 (500-900°C).
- 使用吸附-脱附等热法,光谱学和显微镜对改性FA进行表征.
- 用MB进行吸附实验,动力和异温建模 (伪二阶,Langmuir).
- 密度函数理论 (DFT) 的计算,以了解MB的结合机制.
主要成果:
- 优化的FA (PFA-6M-C700) 实现了MB的Langmuir最大吸附能力 (qmax) 为11.0 mg/g.
- 修改后的FA显示平衡时的MB吸收比原始FA高9倍.
- 增强的吸附与增加的表面积,毛孔大小和表面化学变化 (状相,减少碳) 相关.
- 吸附遵循伪二阶动力学;兰慕尔模型适合PFA-6M-C700.
- 在8个循环后,PFA-6M-C700保持了82%的容量,表明了良好的重复使用性.
- DFT证实了在具有特定O,OH和Al配置的SiO2表面上MB的最佳结合.
结论:
- 系统性修改显著提高了FA对MB的吸附性能.
- 优化的FA吸附剂是有效的,可重复使用,并提供可持续的解决方案.
- 开发的修改策略可转移到其他应用,如催化和建筑材料.
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