Removal of Pb2+ ions from aqueous solution by P(HEA/IA) hydrogels
| Autor: | Antić Katarina M., Babić Marija M., Vuković Jovana S., Onjia Antonije E., Filipović Jovanka M., Tomić Simonida Lj. |
|---|---|
| Jazyk: | English<br />Serbian |
| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Hemijska Industrija, Vol 70, Iss 6, Pp 695-705 (2016) |
| Druh dokumentu: | article |
| ISSN: | 0367-598X 2217-7426 |
| DOI: | 10.2298/HEMIND151225006A |
| Popis: | A series of poly(2-hydroxyethyl acrylate-co-itaconic acid), P(HEA/IA), hydrogels with different HEA/IA ratio, were synthesized using free radical crosslinking/copolymerization and investigated as sorbents for Pb2+ ions from aqueous solutions. Hydrogels were characterized using DMA, FTIR, DSC, SEM and AFM. The adsorption was found to be highly dependent on hydrogel composition, solution pH, sorbent weight, ionic strength and contact time. Five isotherm models, Langmuir, Freundlich, Redlich-Peterson, Temkin and Dubinin-Radushkevich, were applied to the sorption data. The best fit was obtained with Redlich-Peterson isotherm. The separation factor, RL, value indicated favorable sorption for Pb2+ ions. The maximum sorption capacities were 392.2 and 409.8 mg/g for P(HEA/2IA) and P(HEA/10IA), respectively. Kinetic data showed best fit with pseudo-second-order model. Thermodynamic studies revealed that the reaction was exothermic and proceeds with a decrease in entropy. Moreover, P(HEA/IA) hydrogel showed the most pronounced sorption toward Pb2+ ions from environment containing Cu2+, Zn2+, Cd2+, Ni2+ and Co2+ ions. Sorption/desorption experiments, showed that the P(HEA/IA) hydrogels could be reused without significant loss of the initial properties even after three adsorption-desorption cycles. [Projekat Ministarstva nauke Republike Srbije, br. 172015 i br. 172062] |
| Databáze: | Directory of Open Access Journals |
| Externí odkaz: |
|