通过连接体工程效应调整La-MOF的微观结构,以增强酸盐吸附
Qinqin He1, Hongjun Zhao1, Zedong Teng2
1Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China.
Journal of environmental management
|January 26, 2024
概括
在金属有机框架 (MOF) 中选择有机配体会影响酸盐吸附. 在La-MOF中,较大的孔径增强了吸附,其中的机制包括化学沉和内部球体复合.
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:
- 金属有机框架 (MOF) 的合成涉及选择有机配体,这影响了它们的吸附性能.
- 从水中去除酸盐对于防止缩至关重要.
研究的目的:
- 合成和表征四种以为基础的MOF (La-MOFs) 与不同的有机配体用于酸盐吸附.
- 确定La-MOFs的结构性质与它们的酸盐吸附效率之间的关系.
- 阐明吸附机制和共存离子对酸盐去除的影响.
主要方法:
- 四种La-MOF (La-SA,La-FA,La-TA,La-OA) 的溶热合成,具有不同的有机配体.
- 在各种条件下评估酸盐吸附能力和吸附率.
- 分析结构性质,包括平均孔径.
- 研究共存的离子效应 (碳酸盐和二碳酸盐) 和pH的影响.
- 使用FT-IR,XRD,XPS和XANES进行表征,以确定吸附机制.
主要成果:
- 酸盐吸附能力和吸附率按照以下顺序进行:La-SA > La-FA > La-TA > La-OA.
- 平均孔径与吸附能力正相关 (R2 = 0.86).
- 在La-SA,La-FA和La-TA上酸盐吸附被碳酸盐和二碳酸盐离子抑制,主要是由于pH值的变化.
- 在碳酸盐和碳酸盐的存在下,La-OA表现出增强的酸盐吸附,特别是在性条件下.
- 吸附机制涉及静电吸引,化学沉和内部球体复合,后两个占主导地位.
- XPS分析表明,酸盐吸附主要在La-FA和La-OA上形成LaPO4,而La-SA和La-TA则形成LaPO4·xH2O晶体和内部球体复合体.
结论:
- 结构性质,特别是平均孔径,显著影响La-MOFs的酸盐吸附性能.
- 碳酸盐和二碳酸盐离子的存在可以抑制或增强酸盐吸附,这取决于特定的La-MOF结构和溶液pH值.
- 化学沉和内部球体复合是这些La-MOF吸附酸盐的主要机制.
- 这项研究提供了对MOF合理设计的见解,以有效地去除酸盐,考虑到材料形态和可调性质.
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