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Adsorption Isotherm Performance of Zr-Mn Binary Oxide for Efficient Removal of Antibiotics Tetracycline


Affiliations
1 Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
 

Zr-Mn binary oxide was prepared by a simple co-precipitation method, in which Mn(II) was tentatively used to prepare a precursor solution. Then the prepared Zr-Mn binary oxide was used for the adsorptive removal of tetracycline (TC). Effect of molar ratio of Zr/Mn, adsorbent dose and solution pH was investigated. The Zr-Mn binary oxide with a presumed molar ratio of Zr/Mn at 2:1 had a better adsorption performance. The removal efficiency of TC (15 mg/L) at a dose of 10 mg achieved as much as 97.4%, which demonstrated an excellent adsorption capability of Zr-Mn binary oxide. Acidic and near-neutral solution pH conditions were favourable for the uptake of TC. Freundlich model described the adsorption isotherm better than Langmuir model, indicating a heterogeneous surface of the prepared adsorbent. Using Langmuir model, the calculated maximal adsorption capacities for TC achieved 129.5 mg/g at 298 K. Thermodynamic analysis indicated that the changes of enthalpy and entropy of the adsorption processes were 206.32 KJ mol-1 and 752.0 J mol-1 k-1, respectively. The negative value of Gibbs free energy change and the positive value of enthalpy also indicated that the adsorption process is spontaneous and endothermic.

Keywords

Zr-Mn Binary Oxide, Tetracycline, Adsorption, Isotherm.
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  • Adsorption Isotherm Performance of Zr-Mn Binary Oxide for Efficient Removal of Antibiotics Tetracycline

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Authors

Gangfu Song
Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
Wei Li
Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
Jingrong Zhai
Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
Shulei Sun
Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
Yalin Li
Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
Guoting Li
Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China

Abstract


Zr-Mn binary oxide was prepared by a simple co-precipitation method, in which Mn(II) was tentatively used to prepare a precursor solution. Then the prepared Zr-Mn binary oxide was used for the adsorptive removal of tetracycline (TC). Effect of molar ratio of Zr/Mn, adsorbent dose and solution pH was investigated. The Zr-Mn binary oxide with a presumed molar ratio of Zr/Mn at 2:1 had a better adsorption performance. The removal efficiency of TC (15 mg/L) at a dose of 10 mg achieved as much as 97.4%, which demonstrated an excellent adsorption capability of Zr-Mn binary oxide. Acidic and near-neutral solution pH conditions were favourable for the uptake of TC. Freundlich model described the adsorption isotherm better than Langmuir model, indicating a heterogeneous surface of the prepared adsorbent. Using Langmuir model, the calculated maximal adsorption capacities for TC achieved 129.5 mg/g at 298 K. Thermodynamic analysis indicated that the changes of enthalpy and entropy of the adsorption processes were 206.32 KJ mol-1 and 752.0 J mol-1 k-1, respectively. The negative value of Gibbs free energy change and the positive value of enthalpy also indicated that the adsorption process is spontaneous and endothermic.

Keywords


Zr-Mn Binary Oxide, Tetracycline, Adsorption, Isotherm.

References