Selective removal of heavy metals by Zr-based MOFs in wastewater: New acid and amino functionalization strategy
Selective removal of heavy metals by Zr-based MOFs in wastewater: New acid and amino functionalization strategy
复制标题
锆基 MOF 选择性去除废水中的重金属：新的酸和氨基功能化策略
DOI：
10.1016/j.jes.2021.10.010
复制
发表时间：
2022-02-02
影响因子：
6.9
通讯作者：
Lu, Wenying
中科院分区：
文献类型：
--
作者：
Chen, Ping;Wang, Yalan;Lu, Wenying
锆基金属有机骨架材料（MOFs）是近年来发展起来的一种用于治理重金属污染的新型材料，其主要应用于六价铬（Cr 6+）等污染物对周围生态系统的破坏和对人类健康的威胁。这类MOF稳定性好，制备方便，但存在吸附容量低的缺点，限制了其广泛应用。为此，制备了新型甲酸和氨基改性的M0 F，称为Form 110 -66-NH 2。由于甲酸的改性，其比表面积、孔径和晶粒尺寸得到有效扩大，对Cr 6+的吸附能力显著增强。在最佳条件下，Form-UiO-66-NH 2表现出优异的吸附容量（338.98 mg/g），比未改性的锆基MOF和大多数其他吸附剂报道的吸附容量高出10倍。通过光电性能和pH值的研究，证实了Form-UiO-66-NH 2对Cr 6+的吸附机理为静电吸附。改性后的Form-UiO_（66）-NH_2对Cr ~（6+）吸附能力的提高归因于其比表面积的增大和表面电荷的增加。本研究揭示了一个重要的发现，Form-UiO-66-NH 2阐明了在含有有毒重金属离子和常见非金属水质因子的混合废水中对Cr（6+）的选择性吸附。该研究为提高锆基MOF吸附剂的吸附能力提供了新的酸和氨基官能化前景，同时证明了它们对目标污染物吸附的相关性。(C)2022中国科学院生态环境科学研究中心由爱思唯尔公司出版
Zr-based metal-organic frameworks (MOFs) have been developed in recent years to treat heavy metals, e.g. hexavalent chromium Cr6+ pollution, which damages the surrounding ecosystem and threaten human health. This kind of MOF is stable and convenient to prepare, but has the disadvantage of low adsorption capacity, limiting its wide application. To this end, a novel formic acid and amino modified MOFs were prepared, referred to as FormUiO-66-NH2. Due to the modification of formic acid, its specific surface area, pore size, and crystal size were effectively expanded, and the adsorption capacity of Cr6+ was significantly enhanced. Under optimal conditions, Form-UiO-66-NH2 exhibited an excellent adsorption capacity (338.98 mg/g), similar to 10 times higher than that reported for unmodified Zr-based MOFs and most other adsorbents. An in-depth study on the photoelectronic properties and pH confirmed that the adsorption mechanism of Form-UiO-66-NH2 to Cr6+ was electrostatic adsorption. After modification, the improvement of Cr6+ adsorption capacity by Form-UiO66-NH2 was attributed to the expansion of its specific surface area and the increase in its surface charge. The present study revealed an important finding that Form-UiO-66-NH2 elucidated selective adsorption to Cr(6+ )in mixed wastewater containing toxic heavy metal ions and common nonmetallic water quality factors. This research provided a new acid and amino functionalization perspective for improving the adsorption capacity of Zr-based MOF adsorbents while simultaneously demonstrating their pertinence to target contaminant adsorption. (C) 2022 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.