| Autor: |
Sivagangi Reddy, N., Madhusudana Rao, K., Sudha Vani, T.J., Krishna Rao, K.S.V., Lee, Yong Ill |
| Zdroj: |
Desalination & Water Treatment; March 2016, Vol. 57 Issue: 14 p6503-6514, 12p |
| Abstrakt: |
AbstractIn this study, we have developed pH sensitive potential semi-IPN hydrogels which are composed from pectin, acrylamide, acrylamidoglycolic acid using N,N'-methylene-bis-acrylamide as a cross-linker. The formation and morphology of semi-IPNs were confirmed by FTIR and SEM studies. Swelling and metal ion uptake studies of the semi-IPN hydrogels were performed for Cu2+and Ni2+ions. Competitive adsorption studies were also carried out for Cu2+, Co2+, and Ni2+. Further the kinetics data were fitted with pseudo-first and pseudo-second-order kinetic models to investigate the adsorption mechanism. The equilibrium data were interpreted by the Langmuir, Freundlich, and Temkin models. The maximum adsorption capacity of semi-IPN hydrogels calculated from the Langmuir model was found to be 203.7 and 121.7 mg g−1for Cu2+and Ni2+ions, respectively. The adsorption process is described by a pseudo-second-order kinetic model. |
| Databáze: |
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