Research uncovers the mechanism of memory effect of lamellar double hydroxides (LDH).
Synthetic dyes are in constant use in a wide variety of industries, from textile to cosmetics. Both the production and use of these substances can lead to environmental problems if they are not properly degraded or removed from industrial effluents. Among the many physical, chemical or biological processes that can be used for the treatment of such wastes, the adsorption processes are noteworthy for combining low cost and high removal rates.
R. M. M. Santos et al.  used the LNLS facilities to investigate the properties of lamellar double hydroxides (LDH), a family of anionic clays with high adsorption capacity, for the removal of synthetic dyes.