Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 565, Issue -, Pages 337-344Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.01.031
Keywords
Metal organic frameworks; Graphene oxide; Lanthanum; Phosphorus recovery; Water purification
Categories
Funding
- National Natural Science Foundation of China [21808018, 21876015, 21878026]
- Natural Science Research Project of Jiangsu Province [18KJB610002]
- Basic Research on the Application of Changzhou [CJ20180055]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX18_2620]
- Jiangsu Provincial Graduate Research and Practice Innovation Program [SJCX17_0711]
- 333 Project of Jiangsu Province [BRA2018323]
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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(mu-L)(mu-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 MOF5 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%. (C) 2020 Elsevier Inc. All rights reserved.
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