Preparation Of Novel Zno-Np@Zn-Mof-74 Composites For Simultaneous Removal Of Copper And Tetracycline From Aqueous Solution
SEPARATION AND PURIFICATION TECHNOLOGY(2021)
Abstract
In this study, layered porous ZnO microspheres, instead of traditional zinc ions, were used to obtain a composite of nano-ZnO and a metal organic framework (Zn-MOF-74), namely ZnO-NP@Zn-MOF-74. Compared with the traditional Zn-MOF-74, the ZnO-NP@Zn-MOF-74 showed better removal performances for both copper (Cu) and tetracycline (TC) due to its smaller size and good affinities of the loaded nano-ZnO. Batch experiments showed that the simultaneous removal of Cu and TC by the ZnO-NP@Zn-MOF-74 was rapid and pH-dependent. The removal efficiencies of both Cu and TC increased rapidly during the first 10 min and could reach equilibriums within 2 h. The maximum sorption capacities of Cu and TC on the ZnO-NP@Zn-MOF-74 derived from the Langmuir model were 106.27 and 137.17 mg.g(-1), respectively. The removal mechanisms for Cu and TC involved surface complexation, pi-pi stacking, ion exchange, and electrostatic interaction. In addition, the formation of the ZnO-NP@Zn-MOF-74-Cu-TC complex on the surface of the ZnO-NP@Zn-MOF-74 improved the removal of both TC and Cu. Given the above results, the ZnO-NP@Zn-MOF-74 has great application prospects for the treatment of Cu and TC polluted water.
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Key words
Removal, Copper, Tetracycline, ZnO, Metal organic framework
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