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bce ›› 2017, Vol. 51 ›› Issue (1): 39-43.doi: 10.3969/j.issn.1673-5854.2017.01.007

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Adsorption and Controlled Release of Gatifloxacin by Coconut Shell Activated Carbon

ZHANG Jiaqiang, TAN fei, XIAO Linlong, HUANG Biao   

  1. Adsorption and Controlled Release of Gatifloxacin by Coconut Shell Activated Carbon
  • Received:2016-03-24 Online:2017-01-30 Published:2017-01-23

Abstract: The adsorption and controlled release of gatifloxacin(GTFX) from aqueous solution by coconut shell activated carbon were studied. The adsorption isotherms were measured at different temperatures. The standard changes of free energy, enthalpy and entropy in adsorption processes were calculated from the Freundlich equation. And the adsorption of GTFX was in accord with Freundlich equation. The ΔH of absorption was -1.7374kJ/mol, which demonstrated that the absorption was an exothermic process, and ΔH with less than 20kJ/mol indicated that the adsorption process was mostly physical adsorption. Meanwhile, Gibbs free energy(ΔG) was determined to be less than zero. This indicated that the adsorption was a spontaneous process. The results indicated that the value of ΔS was the main driving force of adsorption. Compared with the original activated carbon, the controlled release capacity of nitrate modified sample increased and that of ammonia water modified sample decreased. The different activated carbon controlled release processes marched with Higuchi equation.

Key words: adsorption, activated carbon, thermodynamics, gatifloxacin, controlled release

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