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高稳定性锆基金属有机框架材料对水中酸性有机染料的吸附行为

Adsorption Behavior of High Stable Zr-Based MOFs for the Removal of Acid Organic Dye from Water.

作者信息

Zhang Ke-Deng, Tsai Fang-Chang, Ma Ning, Xia Yue, Liu Huan-Li, Zhan Xue-Qing, Yu Xiao-Yan, Zeng Xiang-Zhe, Jiang Tao, Shi Dean, Chang Chang-Jung

机构信息

Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China.

Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan.

出版信息

Materials (Basel). 2017 Feb 20;10(2):205. doi: 10.3390/ma10020205.

DOI:10.3390/ma10020205
PMID:28772564
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5459129/
Abstract

Zirconium based metal organic frameworks (Zr-MOFs) have become popular in engineering studies due to their high mechanical stability, thermostability and chemical stability. In our work, by using a theoretical kinetic adsorption isotherm, we can exert MOFs to an acid dye adsorption process, experimentally exploring the adsorption of MOFs, their external behavior and internal mechanism. The results indicate their spontaneous and endothermic nature, and the maximum adsorption capacity of this material for acid orange 7 (AO7) could be up to 358 mg·g at 318 K, estimated by the Langmuir isotherm model. This is ascribed to the presence of an open active metal site that significantly intensified the adsorption, by majorly increasing the interaction strength with the adsorbates. Additionally, the enhanced π delocalization and suitable pore size of UiO-66 gave rise to the highest host-guest interaction, which further improves both the adsorption capacity and separation selectivity at low concentrations. Furthermore, the stability of UiO-66 was actually verified for the first time, through comparing the structure of the samples before and after adsorption mainly by Powder X-ray diffraction and thermal gravimetric analysis.

摘要

基于锆的金属有机框架材料（Zr-MOFs）因其高机械稳定性、热稳定性和化学稳定性而在工程研究中受到广泛关注。在我们的工作中，通过使用理论动力学吸附等温线，我们可以将MOFs应用于酸性染料吸附过程，通过实验探索MOFs的吸附性能、外部行为和内部机制。结果表明其具有自发吸热性质，根据朗缪尔等温线模型估计，该材料在318 K时对酸性橙7（AO7）的最大吸附容量可达358 mg·g 。这归因于存在开放的活性金属位点，该位点通过主要增加与吸附质的相互作用强度，显著增强了吸附作用。此外，UiO-66增强的π离域和合适的孔径导致了最高的主客体相互作用，这进一步提高了低浓度下的吸附容量和分离选择性。此外，通过主要利用粉末X射线衍射和热重分析比较吸附前后样品的结构，首次实际验证了UiO-66的稳定性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24ad/5459129/2a9e2c138816/materials-10-00205-g007.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24ad/5459129/2a9e2c138816/materials-10-00205-g007.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24ad/5459129/2a9e2c138816/materials-10-00205-g007.jpg

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