Synthesis, Characterization, and Evaluation of Metal-Organic Frameworks for Water Decontamination: An Integrated Experiment
Synthesis, Characterization, and Evaluation of Metal-Organic Frameworks for Water Decontamination: An Integrated Experiment
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用于水净化的金属-有机骨架的合成、表征及评价：综合实验
DOI：
10.1021/acs.jchemed.2c00115
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发表时间：
2022-06-14
影响因子：
3
通讯作者：
So, Monica C.
中科院分区：
文献类型：
--
作者：
Todd, Celia;Ceballos, Carlos Melchor;So, Monica C.
使用金属有机框架（MOFs），一种由金属阳离子和有机连接体组成的纳米多孔和结晶扩展固体材料的综合实验室经验，被开发并通过了高年级，专业水平的化学和生物化学学生。在这个实验室中，学生们被引导通过简单的溶剂热合成四种MOFs：UiO-66，UiO-66-NH 2，ZIF-8和ZIF-67。表征，特别是粉末X射线衍射（PXRD），和能量色散X射线光谱（EDXS）分别用于评估的结晶度，形态，和组成的MOFs，。然后，学生们研究了测量条件（MOF剂量，MOF表面电荷和染料抗衡离子的电荷密度）对使用合成的MOF从水溶液中去除染料的影响。通过利用傅里叶变换红外光谱（FT-IR）和紫外可见光谱，学生们确认了染料的结合，并量化了从溶液中去除的染料量。学生们发现，所有四种多孔和结晶的MOF都能从水中去除酸性橙子7和孔雀石绿色，但ZIF-67表现出最高的吸附能力，在5 mg的剂量下，每克ZIF-67可吸附30 mg的酸性橙子7。这种实验室经验允许学生应用和连接一般，有机，无机和物理化学中发现的概念，同时在材料化学不断增长的领域中引入各种仪器和实验室技术。接触这个领域可以帮助激发学生的兴趣，让他们接触到可持续发展问题和潜在的解决方案，并实施战略，以帮助解决这些挑战。
An integrated laboratory experience using metal-organic frameworks (MOFs), a nanoporous and crystalline extended solid material composed of metal cations and organic linkers, was developed and adopted for upper-division, major-level chemistry and biochemistry students. In this laboratory, students were guided through the facile solvothermal synthesis of four MOFs: UiO-66, UiO-66-NH2, ZIF-8, and ZIF-67. Characterization, specifically powder X-ray diffraction (PXRD), and energy-dispersive X-ray spectroscopy (EDXS) were used to evaluate the crystallinity, morphology, and composition of the MOFs, respectively. Students then investigated the effects of measurement conditions (MOF dosage, MOF surface charge, and charge density of dye counterions) on the removal of dyes from aqueous solutions using the synthesized MOFs. Through the utilization of Fourier-transform infrared spectroscopy (FT-IR) and UV-vis spectroscopy, students confirmed the binding of dyes and quantified the amounts of dye removed from solution. Students found that all four porous and crystalline MOFs removed acid orange 7 and malachite green from water, but ZIF-67 exhibited the highest adsorption capacity of 30 mg of acid orange 7 per gram of ZIF-67 at a dosage of 5 mg. This laboratory experience allows students to apply and connect concepts found in general, organic, inorganic, and physical chemistry while simultaneously getting introduced to various instrumentation and lab techniques within a growing field in materials chemistry. Exposure to this field can help stimulate student interest, expose them to sustainability problems and potential solutions, and implement strategies to help solve these challenges.