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Construction of lanthanum modified MOFs graphene oxide composite membrane for high selective phosphorus recovery and water purification.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-15 , DOI: 10.1016/j.jcis.2020.01.031 Ning Wei 1 , Xudong Zheng 2 , Qiao Li 1 , Chenxia Gong 1 , Hongxiang Ou 2 , Zhongyu Li 2
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-15 , DOI: 10.1016/j.jcis.2020.01.031 Ning Wei 1 , Xudong Zheng 2 , Qiao Li 1 , Chenxia Gong 1 , Hongxiang Ou 2 , Zhongyu Li 2
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Metal organic framework materials (MOFs) are kinds of hybrid materials with intra-molecular pores formed by self-assembly of organic ligands and metal ions through coordination bonds. In the paper, a type of MOFs named as [Zn(μ-L)(μ-1,3-dpp)](mof-1), using Zn2+ as metal ions, 4,4'-oxybis(benzoic acid) and 1,3-di(4-pyridyl)propane as organic ligands was synthesized. The rare earth element lanthanum, which has specific adsorption for phosphorus, is intercalated into mof-1 by the impregnation method in order to remove phosphorus-containing wastewater. In order to optimize the nano-sized La-mof-1 materials to facilitate separation, we prepared a membrane by blending MOFs materials with graphene oxide (GO) by pressure application. The addition of GO not only facilitates the separation of materials, but also has excellent removal ability for water purification. After a series of structural characterization, the adsorption properties of materials were tested. The experimental results showed that the total phosphorus in the water can get to the maximum adsorption capacity when pH = 4.0. It can be viewed in thermodynamic studies that increasing the temperature favors the adsorption reaction. Increasing the temperature to the 318 K, the equilibrium adsorption capacity of the membrane to total phosphorus in the water reached 139.51 mg/g. The adsorption removal rate of total phosphorus can reach 100% when its concentration is lower than 100 mg/L. This highlights the advantages of intercalating lanthanum into MOFs. The penetration curve was drawn by dynamic adsorption experiments to understand the mass transfer mechanism of La-mof-1GO membrane. Since GO also has a large specific surface area, it is another excellent adsorption material. Experimental data showed that compared with the original water sample, the removal rate of COD in the water reached 73.9%.
中文翻译：
镧改性MOFs氧化石墨烯复合膜的构建，可实现高选择性的磷回收和水净化。
金属有机骨架材料（MOF）是具有分子内孔的杂化材料，这些分子是通过有机配体和金属离子通过配位键自组装而形成的。在本文中，一种类型的MOF名为[Zn（μ-L）（μ-1,3-dpp）]（mof-1），使用Zn2 +作为金属离子，4,4'-氧双（苯甲酸）和合成了1，3-二（4-吡啶基）丙烷作为有机配体。通过浸渍法将对磷具有特定吸附力的稀土元素镧插入到mof-1中，以去除含磷废水。为了优化La-mof-1纳米材料以促进分离，我们通过加压将MOFs材料与氧化石墨烯（GO）混合来制备膜。GO的添加不仅促进了物料的分离，而且具有优异的净水去除能力。经过一系列的结构表征，测试了材料的吸附性能。实验结果表明，pH = 4.0时，水中的总磷可达到最大吸附量。在热力学研究中可以看出，升高温度有利于吸附反应。将温度提高到318 K，膜对水中总磷的平衡吸附能力达到139.51 mg / g。当其浓度低于100 mg / L时，总磷的吸附去除率可达到100％。这突出了将镧嵌入MOF的优势。通过动态吸附实验绘制渗透曲线，以了解La-mof-1GO膜的传质机理。由于GO还具有较大的比表面积，因此它是另一种出色的吸附材料。实验数据表明，与原始水样相比，水中COD的去除率达到73.9％。
更新日期：2020-01-15
中文翻译：
镧改性MOFs氧化石墨烯复合膜的构建，可实现高选择性的磷回收和水净化。
金属有机骨架材料（MOF）是具有分子内孔的杂化材料，这些分子是通过有机配体和金属离子通过配位键自组装而形成的。在本文中，一种类型的MOF名为[Zn（μ-L）（μ-1,3-dpp）]（mof-1），使用Zn2 +作为金属离子，4,4'-氧双（苯甲酸）和合成了1，3-二（4-吡啶基）丙烷作为有机配体。通过浸渍法将对磷具有特定吸附力的稀土元素镧插入到mof-1中，以去除含磷废水。为了优化La-mof-1纳米材料以促进分离，我们通过加压将MOFs材料与氧化石墨烯（GO）混合来制备膜。GO的添加不仅促进了物料的分离，而且具有优异的净水去除能力。经过一系列的结构表征，测试了材料的吸附性能。实验结果表明，pH = 4.0时，水中的总磷可达到最大吸附量。在热力学研究中可以看出，升高温度有利于吸附反应。将温度提高到318 K，膜对水中总磷的平衡吸附能力达到139.51 mg / g。当其浓度低于100 mg / L时，总磷的吸附去除率可达到100％。这突出了将镧嵌入MOF的优势。通过动态吸附实验绘制渗透曲线，以了解La-mof-1GO膜的传质机理。由于GO还具有较大的比表面积，因此它是另一种出色的吸附材料。实验数据表明，与原始水样相比，水中COD的去除率达到73.9％。
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