Efficient Capture and Effective Sensing of Cr2O72– from Water Using a Zirconium Metal–Organic Framework,Inorganic Chemistry

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Efficient Capture and Effective Sensing of Cr2O72– from Water Using a Zirconium Metal–Organic Framework
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1021/acs.inorgchem.7b02327
Zu-Jin Lin _{1,

2} , He-Qi Zheng ₁ , Huan-Yu Zheng ₁ , Li-Ping Lin ₁ , Qin Xin ₁ , Rong Cao ₂

Affiliation

Highly efficient decontamination of heavily toxic Cr₂O₇^2– from water remains a serious task for public health and ecosystem protection. An easily regenerative and reused sorbent with suitable porosity may address this task. Herein, a series of water-stable and ecofriendly metal–organic frameworks (MOFs) with large surface areas were assessed for their ability to adsorb and separate Cr₂O₇^2– from aqueous solutions. Among these tested MOFs, NU-1000 shows an extraordinary capability to efficiently capture (within 3 min) Cr₂O₇^2– with a sorption capacity of up to 76.8 mg/g, which is the largest one for the neutral MOF-based Cr₂O₇^2– sorbents. NU-1000 also shows remarkable selectivity for Cr₂O₇^2– capture and can effectively reduce the Cr(VI) concentration from 24 ppm to 60 ppb, which is below the acceptable limit for the drinking water standard (100 ppb by the U.S. Environmental Protection Agency). Moreover, this adsorbent can be easily regenerated by Soxhlet extraction with an acidic methanol solution (2.5 M HCl) and can be reused at least three times without a significant loss of it adsorption ability. More intriguingly, NU-1000 can also serve as an efficient photoluminescent probe for the selective detection of Cr₂O₇^2– in aqueous media. The Cr₂O₇^2– detection limit is as low as 1.8 μM, and the linear range is from 1.8 to 340 μM. Our work shows that NU-1000 is a unique material combining both efficient sorption and exceptional fluorescent sensing of Cr₂O₇^2– in aqueous media.

中文翻译：

使用锆金属-有机框架有效捕获和有效传感水中的Cr ₂ O ₇^2–

从水中对高毒的Cr ₂ O ₇^2–进行高效去污仍然是公共卫生和生态系统保护的一项艰巨任务。具有适当孔隙率的易于再生和再利用的吸附剂可以解决此任务。在此，评估了一系列具有大表面积的水稳定性好且生态友好的金属有机框架（MOF）从水溶液中吸附和分离Cr ₂ O ₇^2–的能力。在这些经过测试的MOF中，NU-1000具有非凡的能力（3分钟内）有效捕获Cr ₂ O ₇^2–，吸附量高达76.8 mg / g，这是中性基于MOF的Cr的最大吸附量。_2个O ₇^{2 –}吸附剂。NU-1000还显示出对Cr ₂ O ₇^2–捕获的显着选择性，并且可以有效地将Cr（VI）的浓度从24 ppm降低到60 ppb，这低于饮用水标准的可接受极限（美国环境标准为100 ppb）。保护局）。此外，该吸附剂可以通过用酸性甲醇溶液（2.5 M HCl）进行索氏提取而容易地再生，并且可以重复使用至少3次而不会显着降低其吸附能力。更有趣的是，NU-1000还可作为一种高效的光致发光探针，用于选择性检测水性介质中的Cr ₂ O ₇^2–。铬₂ O ₇^{2 –}检测限低至1.8μM，线性范围为1.8至340μM。我们的工作表明，NU-1000是一种独特的材料，结合了在水性介质中对Cr ₂ O ₇^2–的有效吸附和出色的荧光感应。

更新日期：2017-11-07

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