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- Title
Nano-ZnO-loaded poly (acrylamide-co-itaconic acid) hydrogel as adsorbent for effective removal of iron from contaminated water.
- Authors
Sharma, Neeraj; Tiwari, Alka
- Abstract
The present research focuses on the adsorptive efficiency of nano-ZnO-loaded poly (acrylamide-co-itaconic acid) hydrogel for iron removal from synthetic as well as contaminated water by batch and column adsorption techniques. The influence of pH, contact time, adsorbent dose, temperature, and metal ion concentration on the sensitivity of the removal process was inspected. The copolymer was synthesized and nano-ZnO particles were incorporated within the polymeric matrix by in situ technique. The size, structure, and coating of nano-ZnO particles were characterized by TEM, SEM, Fourier transform infrared spectroscopy, and AFM analysis, respectively. The sorption data were analyzed and fitted to linearized adsorption isotherm of the Langmuir, Freundlich, and Temkin equations, respectively. Equilibrium data fitted very well to the Freundlich model. The kinetics of sorption was analyzed using pseudo-first-order and pseudo-second-order kinetic models. Kinetic parameters, rate constants, equilibrium sorption capacities, and related correlation coefficients for each kinetic model were calculated. Different thermodynamic parameters, i.e. ΔG°, ΔH° and ΔS° were also evaluated which proved the sorption to be feasible, spontaneous, and exothermic in nature. This hydrogel has been found to be an efficient adsorbent for iron removal from water (>99% removal) and could be regenerated efficiently for further experiments.
- Subjects
ZINC oxide; NANOPARTICLES; HYDROGELS; ITACONIC acid; FOURIER transform infrared spectroscopy
- Publication
Desalination & Water Treatment, 2016, Vol 57, Issue 14, p6463
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2015.1005158