"Nanotcomposites and nanomaterials"

ZnAl layered double hydroxides for simultaneous removal of anionic and cationic organic dye pollutants
Starukh G.M.1, Budzinska V.L.2
1 Chuiko Institute of Surface Chemistry, NAS of Ukraine,
17 General Naumov Str., Kyiv 03164, Ukraine, starukh_galina@ukr.net

2 Institute of Macromolecular Chemistry, NAS of Ukraine,
Kharkiv highway, 48, Kyiv o2160, Ukraine, budzinska@meta.ua

Organic dyes are an important class of pollutants in a wastewater, and it is necessary to find a broad–spectrum adsorbent that can effectively remove different kinds of dyes. It is preferably to use naturally occurring adsorbents. Layered double hydroxides (LDH) having a positively charged layered brucite related structure is rare in nature but easy to prepare [1]. Due to their anionic exchange capacity, LDH are suitable for sorption of anionic species, but are not applicable for positively charged ones. Recently, some researchers used anionic surfactants to modify LDH’s surface properties, and then to adsorb many types of organic molecules [2]. The organic phase in the interlayer which was formed by the intercalated organic ions, acted as an adsolubilization medium, increased the affinity of LDHs for organic compounds. 
In our work we propose other approach to the removal of organic dyes from wastewater. We study the simultaneous adsorption of anionic Indigo carmine and cationic Methylene blue dyes with ZnAl LDH. The presentation of work will contain data on structure, morphology and thermal properties characterization of nanosized ZnAl LDH. The results on optimal conditions for maximal removal of and on the further utilization of the LDH–dye sludge dyes will be presented. The LDH–anionic dye–cationic dye sludge was reused as colorant filled in polyurethane films.

1.	Costantino U., Leroux F., Nocchetti M., Mousty C. in: F. Bergaya and G. Lagaly (Ed), Developments in Clay Science, Elsevier: Amsterdam, 2013, vol. 5, p: 765.
2.	Bruna F, Celis R, Real M, Cornejo J. Organo/LDH nanocomposite as an adsorbent of polycyclic aromatic hydrocarbons in water and soil–water systems // J Hazard Mater. - 2012; 225–226. P.74–80.