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Physical adsorption properties of Zr-organic framework material for dichromate in water(PDF)


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Physical adsorption properties of Zr-organic framework material for dichromate in water
HA Erqi1 FAN Zenglu1 LI Qing2 LI Shiqi1 WANG Ya2
1.School of Textile Science and Engineering, Xi’an Polytechnic University, Xi’an 710048, China;
2.School of Environmental and Chemical Engineering, Xi’an Polytechnic University, Xi’an 710048, China
Zr-organic framework material dichromate physical adsorption kinetics model
TS 190. 3
In order to remove highly toxic dichromate(Cr2O72-)from water, a Zr-organic framework material was synthesized by employing Zr4+with 2,2’-biquinoline-4,4’-dicarboxylic acid(H2L)under solvothermal reactions to remove Cr2O72- through physical adsorption.Crystallinity, chemical functional group, surface morphology, and thermal stability of Zr-MOF were analyzed by X-ray diffraction, fourier transform infrared spectroscopy, scanning electron microscopy, and thermogravimetric analysis, respectively.The effects of the amount of Zr-MOF, the initial mass concentration of Cr2O72- and the adsorption temperature on the adsorption efficiency were investigated. The results show that the target product Zr-MOF synthesized has good crystallinity, polyhedron, and excellent thermal stability.The adsorption amount of Zr-MOF towards Cr2O72- would decrease as the amount of adsorbent grows and increase as the initial concentration of Cr2O72- intensifies, and decrease as the ambient temperature rises. When the amount of Zr-MOF is 15 mg, the initial concentration of Cr2O72- is 20 mg/L, the adsorption temperature is 25 ℃,and thus the adsorption effect is bettter. Moreover, the physical adsorption process of Zr-MOF towards Cr2O72- in aqueous solution is more consistent with the quasi-secondary kinetic model, and its adsorption behavior is more in line with the Freundlich isotherm adsorption equation.


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Last Update: 2019-10-07