Use of synthetic clay for Removal of Diclofenac Anti-inflammatory

Abstract

The removal of diclofenac by sorption on a synthetic hydrotalcite and on its calcined product was investigated. The solid [Mg-Al-CO₃], prepared by cooprecipitation at constant pH, its calcined mixed oxide was obtained; both solid were characterized by X-ray diffraction and infrared spectroscopy (FTIR). The interaction of these materials with diclofenac shows that the kinetics of sorption was fast and followed the second order model. The effects on the diclofenac concentration, sorbent concentration and temperature were studied. The sorption capacity of the calcined hydrotalcite was close to 1.9 mmole g^-1, which represents only 66% of the AEC, but at the concentrations measured that amount represents up 95% of the diclofenac present in solution in the case of HT-C. This suggests that, particularly HT-C could to constitute interesting adsorbent for the removal of diclofenac. Recycling by restitution and calcination-rebuilding should support the recovery of this pollutant.

Keywords

• Calcined hydrotalcite, diclofenac, sorption capacity, desorption

References

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