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Preparation of Ice-Templated MOF–Polymer Composite Monoliths and Their Application for Wastewater Treatment with High Capacity and Easy Recycling
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-19 00:00:00 , DOI: 10.1021/acsami.7b10872 Qingshan Fu 1, 2 , Lang Wen 1 , Lei Zhang 1 , Xuedan Chen 1 , Daniel Pun 2 , Adham Ahmed 3 , Yonghong Yang 2 , Haifei Zhang 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-19 00:00:00 , DOI: 10.1021/acsami.7b10872 Qingshan Fu 1, 2 , Lang Wen 1 , Lei Zhang 1 , Xuedan Chen 1 , Daniel Pun 2 , Adham Ahmed 3 , Yonghong Yang 2 , Haifei Zhang 2
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An ice-templating process was used to fabricate polymer/MOF monoliths, specifically chitosan/UiO-66, as adsorbents for water treatment. The ice-templated macropores enhanced mass transport, while the monoliths could be easily recovered from solution. This was demonstrated by the adsorption of methylchlorophenoxypropionic acid (MCPP, a herbicide compound) from dilute aqueous solution. To enhance the stability, the freeze-dried monoliths were treated with NaOH solution, solvent exchanged, and dried. The treated chitosan/UiO-66 monolith achieved an adsorption capacity of 34.33 mg g–1 (a maximum theoretic value of 334 mg g–1 by the Langmuir model), closer to the capacity (36.00 mg g–1) of the freshly prepared UiO-66 nanoparticles and much higher than that of the NaOH-washed UiO-66 nanoparticles (18.55 mg g–1), by performing the tests in 60 ppm MCPP solution. The composite monolith could be easily picked up using tweezers and used for recycling tests. Over 80% of the adsorption capacity was retained after three more cycles. The powder X-ray diffraction and N2 sorption studies suggested the crystalline structure of UiO-66 was destroyed during NaOH washing procedure. This, however, provides the potential to improve the adsorption capacity by developing methods to fabricate true polymer/MOF composites.
中文翻译：
冰模板MOF聚合物复合材料的制备及其在高容量易回收废水处理中的应用
使用冰模板工艺来制造聚合物/ MOF整料，特别是壳聚糖/ UiO-66，作为用于水处理的吸附剂。以冰为模板的大孔增强了物质传输，而整料可以很容易地从溶液中回收。这是通过从稀水溶液中吸附甲基氯苯氧基丙酸（MCPP，一种除草剂化合物）来证明的。为了提高稳定性，将冷冻干燥的整料用NaOH溶液处理，交换溶剂，并干燥。经过处理的壳聚糖/ UiO-66整料的吸附容量为34.33 mg g –1（Langmuir模型的最大理论值为334 mg g –1），接近该容量（36.00 mg g –1））（通过在60 ppm MCPP溶液中进行测试），并且比用NaOH洗涤过的UiO-66纳米颗粒（18.55 mg g –1）要高得多。可以使用镊子轻松拾起复合材料整料，并将其用于回收测试。再经过三个循环后，仍保留了80％以上的吸附容量。粉末X射线衍射和N 2吸附研究表明，在NaOH洗涤过程中UiO-66的晶体结构被破坏。然而，这提供了通过开发制造真实的聚合物/ MOF复合材料的方法来提高吸附能力的潜力。
更新日期：2017-09-20
中文翻译：
冰模板MOF聚合物复合材料的制备及其在高容量易回收废水处理中的应用
使用冰模板工艺来制造聚合物/ MOF整料，特别是壳聚糖/ UiO-66，作为用于水处理的吸附剂。以冰为模板的大孔增强了物质传输，而整料可以很容易地从溶液中回收。这是通过从稀水溶液中吸附甲基氯苯氧基丙酸（MCPP，一种除草剂化合物）来证明的。为了提高稳定性，将冷冻干燥的整料用NaOH溶液处理，交换溶剂，并干燥。经过处理的壳聚糖/ UiO-66整料的吸附容量为34.33 mg g –1（Langmuir模型的最大理论值为334 mg g –1），接近该容量（36.00 mg g –1））（通过在60 ppm MCPP溶液中进行测试），并且比用NaOH洗涤过的UiO-66纳米颗粒（18.55 mg g –1）要高得多。可以使用镊子轻松拾起复合材料整料，并将其用于回收测试。再经过三个循环后，仍保留了80％以上的吸附容量。粉末X射线衍射和N 2吸附研究表明，在NaOH洗涤过程中UiO-66的晶体结构被破坏。然而，这提供了通过开发制造真实的聚合物/ MOF复合材料的方法来提高吸附能力的潜力。
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