Polyamidoamine-Based Hydrogel for Removal of Blue and Red Dyes from Wastewater

7/2/2018 12:00:00 AM

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Authors:Vito Rizzi, Federica Fiorini, Giuseppe Lamanna, Jennifer Gubitosa, Eko Adi Prasetyanto, Paola Fini, Fiorenza Fanelli, Angelo Nacci, Luisa DeCola, Pinalysa Cosma

Publication date: June 2018

Advanced Sustainable Systems

Volume:  2 (6), 1-13

Link: https://onlinelibrary.wiley.com/toc/23667486/2018/2/6

 

 

One of the major problems related to the use of dyes in industrial applications is their elimination from the water or soil and eventually their recovery and reu- tilization. In this context, a new biocompatible material, previously considered suitable for biomedical applications, is presented for the first time, as an inno- vative adsorbent material for wastewater treatment.  A polyamidoamine-based hydrogel, prepared by Michael-type polyaddition in water, is used for efficiently adsorbing two anionic toxic textile dyes from aqueous solutions. Several para- meters affecting the adsorption process, such as the pH of solutions containing dyes, the amount of hydrogel and dyes, and the effect of temperature, are inves- tigated. Moreover, the hydrogel dehydration and swollen conditions by using dye water solution are studied by Thermo-Gravimetry  (TG) and Differential Scanning Calorimetry (DSC) analyses, finding that the dehydration temperature plays a relevant role in determining the subsequent adsorbing behavior. The material characterization shows that the adsorption process can be attributed to a combination of electrostatic attraction and intermolecular interactions between hydrogel functional groups and the dye molecules. Visible absorption spectroscopy and Fourier Transform InfraRed-Attenuated Total Reflectance (FTIR-ATR) support the findings. The kinetics of the dye adsorption process are also evaluated, together with the adsorption isotherms.