通过铜浸和氨基功能在铁基金属有机框架中协同增强阴离子染料的选择性吸附
Qiangshun Wu1, Muhammad Saboor Siddique2, Mi Wu3
1School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China.
The Science of the total environment
|February 29, 2024
概括
改性Fe-MOF可以选择性地吸附废水中的阴阳性染料. 铜剂和氨基功能化协同增强选择性,为染料去除和资源回收提供稳定和可回收的解决方案.
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:
- 染料污染废水带来了重大的环境和健康风险.
- 染料与废水的有效分离对于资源回收和环境保护至关重要.
- 金属有机框架 (MOF) 显示了染料吸附的潜力,但需要增强的选择性.
研究的目的:
- 为了提高Fe-MOFs对电离体染料的吸附选择性,使用金属节点注和连接体接种.
- 调查铜兴奋剂和氨基功能化对染料吸附选择性的协同效应.
- 开发一种稳定,可回收和高效的吸附剂,用于从混合染料系统中选择性去除染料.
主要方法:
- 合成经过修改的Fe-MOFs,具有不同的铜剂度和氨基功能化.
- 吸附实验以评估甲基蓝 (MB) 与甲基色 (MO) 和其他阴性染料的选择性.
- 吸附动力学,同热和热力学分析.
- 使用FT-IR和XPS进行表征以阐明吸附机制.
主要成果:
- 铜注和氨基功能化显著增加了甲蓝的选择性吸附系数 (∂MOMB).
- Fe0.6Cu0.4-BDC-NH2显示选择性增加了22.5倍,并有效地从混合系统中分离了各种阴离子染料.
- 吸附剂具有广泛的pH工作范围 (4.0-8.0),强大的抗干扰能力,以及良好的可回收性和稳定性.
- 吸附遵循伪第一阶动力学和兰木尔等温,表明均的,单层化学吸附.
结论:
- 在Fe-MOF中,Cu (II) 兴奋剂和-NH2接种的协同效应为色染料提供了高度选择性的吸附剂.
- Fe0.6Cu0.4-BDC-NH2为废水处理和资源回收提供了一个有希望的解决方案.
- 静电相互作用,键和π-π相互作用是驱动吸附过程的主要机制.
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