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首页> 外文期刊>Chemistry: A European journal >Incorporating Polyoxometalates into a Porous MOF Greatly Improves Its Selective Adsorption of Cationic Dyes**
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Incorporating Polyoxometalates into a Porous MOF Greatly Improves Its Selective Adsorption of Cationic Dyes**

机译：将多金属氧酸盐掺入多孔MOF中可极大地改善其对阳离子染料的选择性吸附**

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摘要

Various polyoxometalates (POMs) were successfully immobilized to the mesoporous coordination polymer MIL-101 resulting in a series of POM–MOF composite materials POM@MIL-101 (POM=K_4PW_(11)VO_(40), H_3PW_(12)O_(40), K_4SiW_(12)O_(40)). These materials were synthesized by a simple one-pot reaction of Keggin POMs, tetramethylammonium hydroxide (TMAH), terephthalic acid (H_2bdc), and Cr~(3+) ions. XRD, FTIR, thermogravimetric analyses (TG), inductively coupled plasma (ICP) spectrometry, and energy-dispersive X-ray spectroscopy (EDX) collectively confirmed the successful combination of POMs and the porous framework. Further, these composites POM@MIL-101 with different loading of POMs were achieved by variation of the POM dosage. Notably, the uptake capacity of MIL-101 towards organic pollutants in aqueous solution was significantly improved by immobilization of hydrophilic POMs into cages of MIL-101. An uptake capacity of 371 mgg~(-1), comparable to that of the graphene oxide sponges, and much higher than that of the commercial activated carbon, was achieved at room temperature in 5 min when dipping 20 mg PW_(11)V@MIL-101 in the methylene blue (MB) solution (100 mL of 100 mgL~(-1) MB solution). Further study revealed that the POM@MIL-101 composite materials not only exhibited a fast adsorption rate towards dye molecules, but also possessed of selective adsorption ability of the cationic dyes in wastewater. For example, the adsorption efficiency of PW_(11)V@MIL-101 (10 mg) towards MB (100 mL of 10 mgL~(-1)) could reach 98% in the initial 5 min, and it could capture MB dye molecules from the binary mixture of the MB and MO with similar size. Also, the POM@MIL-101 materials could be readily recycled and reused, and no POM leached in the dye adsorption process.
机译：各种多金属氧酸盐（POMs）成功地固定在介孔配位聚合物MIL-101上，产生了一系列POM-MOF复合材料POM @ MIL-101（POM = K_4PW_（11）VO_（40），H_3PW_（12）O_（40 ），K_4SiW_（12）O_（40））。通过Keggin POM，氢氧化四甲铵（TMAH），对苯二甲酸（H_2bdc）和Cr〜（3+）离子的简单一锅反应合成了这些材料。 XRD，FTIR，热重分析（TG），电感耦合等离子体（ICP）光谱和能量色散X射线光谱（EDX）共同证明了POM和多孔骨架的成功结合。此外，通过改变POM的用量可以得到具有不同POM负载量的这些复合材料POM @ MIL-101。值得注意的是，通过将亲水性POM固定在MIL-101的笼子中，可以显着提高MIL-101对水溶液中有机污染物的吸收能力。当在室温下浸入20 mg PW_（11）V @时，在5分钟内可达到371 mgg〜（-1）的吸收能力，与氧化石墨海绵相当，远高于商用活性炭。亚甲蓝（MB）溶液中的MIL-101（100 mL的100 mgL〜（-1）MB溶液）。进一步的研究表明，POM @ MIL-101复合材料不仅表现出对染料分子的快速吸附速率，而且还具有对废水中阳离子染料的选择性吸附能力。例如，PW_（11）V @ MIL-101（10 mg）对MB（100 mL的10 mgL〜（-1））对MB的吸附效率在开始的5分钟内可以达到98％，并且可以捕获MB染料MB和MO的二元混合物中的分子大小相似。而且，POM @ MIL-101材料可以方便地回收和再利用，并且在染料吸附过程中不会渗出POM。

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