Sorption of an anionic surfactant from water by a calcined hydrotalcite-like sorbent

Abstract

This work evaluates the sorption potential of an hydrotalcite compound [Mg3Al(OH)8]2CO3H2O, HT, and its calcined product Mg3AlO4(OH), HT500, for sodium dodecylbenzenesulfonate, DBS, in water. The results obtained by spectrophotometric measurements show that the adsorption of DBS in HT was low, while in the HT500 the amount of DBS removed from water was very high, indicating its potential use as removal sorbent. The H-type of the adsorption isotherms and the maximum sorption capacity from Langmuir equation suggest the adsorption of anionic DBS species. X-ray diffraction patterns confirm that DBS adsorbs on HT500 by the reconstruction of the HT layered structure, suggesting the possible recyclability of the calcined sorbent.