**Acknowledgements**

This study was financed by the European project "DYES4EVER" (Use of cyclodextrins for treatment of wastewater in textile industry to recover and reuse textile dyes, LIFE12 ENV/ ES/000309) within the LIFE+ 2012 "Environment Policy and Governance project application" program. We gratefully acknowledge the skilful technical assistance of Mr. Sergio Nuzzo and the precious collaboration of Dr. Maria Josefa Yáñez (Catholic University San Antonio of Murcia, Spain) for SEM measurements.
