调整 UiO-66 框架中的缺陷密度以增强 Pb(II) 吸附,Langmuir

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调整 UiO-66 框架中的缺陷密度以增强 Pb(II) 吸附
Langmuir ( IF 3.7 ) Pub Date : 2021-11-12 , DOI: 10.1021/acs.langmuir.1c02032
Shafqat Ali ₁ , Zareen Zuhra ₁ , Yasir Abbas ₂ , Yufei Shu ₁ , Muhammad Ahmad ₃ , Zhongying Wang ₁

Affiliation

金属有机框架的缺陷工程为将其特征调整到特定应用提供了潜在的前景。在此，通过改变连接体的浓度和反应的合成温度合成了两个系列的有缺陷的 UiO-66 骨架。这些有缺陷的材料显着提高了从废水中去除 Pb(II) 的能力。这种缺陷工程策略不仅创造了额外的活性位点、更多的开放框架和增强的孔隙率，而且暴露了更多的氧基团，作为吸附位点以改善 Pb(II) 吸附。缺陷程度、纹理特征和 Pb(II) 去除性能之间的关系被成功开发为概念验证，突出了缺陷工程在重金属修复中的重要性。为了研究动力学和吸附等温线，我们分别进行了受吸附物时间和浓度影响的吸附实验。对于材料的实用性，还检查了最重要的参数，如 pH 值、温度、吸附剂浓度、选择性和可回收性以及模拟的天然地表水。该研究为研究人员设计其他先进的缺陷材料以通过调整缺陷工程来增强吸附性能提供了线索。和可回收性以及模拟的天然地表水也进行了检查。该研究为研究人员设计其他先进的缺陷材料以通过调整缺陷工程来增强吸附性能提供了线索。和可回收性以及模拟的天然地表水也进行了检查。该研究为研究人员设计其他先进的缺陷材料以通过调整缺陷工程来增强吸附性能提供了线索。

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Tailoring Defect Density in UiO-66 Frameworks for Enhanced Pb(II) Adsorption

Defect engineering of metal organic frameworks offers potential prospects for tuning their features toward particular applications. Herein, two series of defective UiO-66 frameworks were synthesized via changing the concentration of the linker and synthetic temperature of the reaction. These defective materials showed a significant improvement in the capability of Pb(II) removal from wastewater. This strategy for defect engineering not only created additional active sites, more open framework, and enhanced porosity but also exposed more oxygen groups, which served as the adsorption sites to improve Pb(II) adsorption. A relationship among degree of defects, texture features, and performances for Pb(II) removal was successfully developed as a proof-of-concept, highlighting the importance of defect engineering in heavy metal remediation. To investigate the kinetic and adsorption isotherms, we performed adsorption experiments influenced by the time and concentration of the adsorbate, respectively. For the practicality of the materials, the most significant parameters such as pH, temperature, adsorbent concentration, selectivity, and recyclability as well as simulated natural surface water were also examined. This study provides a clue for the researchers to design other advanced defective materials for the enhancement of adsorption performance by tuning the defect engineering.

更新日期：2021-11-23

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