Abstract
In this study sodium alginate (NaAlg) grafted acrylamide (AM)-co-acrylic acid (AA)) and nano zero-valent iron (nZVI) were synthesized by the microwave assisted and coprecipitation method, respectively. The nZVI was dispersed in NaAlg-g-(AM-co-AA) and the adsorbent was characterized by X-ray diffraction (XRD), proton nuclear magnetic resonance (1HNMR), and Fourier transform infrared spectroscopy (FTIR). In order to evaluate the effects of adsorbent dosage, contact time, pH, initial dye concentration and temperature, kinetic and thermodynamic tests were carried out on the adsorbents. The best dose of the NaAlg-g-(AM-co-AA)/nZVI with 0.5% nZVI needed to remove methylene blue (MB) dye (10 mg/L, 50 mL) was 0.2 g at 60 min. For NaAlg-g-(AM-co-AA)/nZVI to effectively remove a large portion of MB dye, pH 8.0 was ideal. To assess the adsorption data, Freundlich, Langmuir, and Dubinin-Radushkevich isotherm models were applied. The Langmuir isotherm performed best for MB adsorption, with an R2 of 0.975. The adsorption equilibrium’s kinetic process followed the pseudo-second-order model (R2=0.9988). The positive ΔGo values obtained from the thermodynamic studies showed that the adsorption processes were endothermic and non-spontaneous.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
