We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Adsorption Behavior of Solvent-Free Microwave Assisted Nanosilica-Functionalized Carboxylic Acids for the Removal of Cobalt (II) from Water.
- Authors
Mahmoud, Mohamed E.; Yakout, Amr A.; Elserw, Mahmoud I. A.; Osman, Maher M.
- Abstract
Nanosilica (NSi) was functionalized by oxalic acid (NSi-Ox) and tartaric acid (NSi-Tar) using solvent-free microwave-assisted approach. The two surface-modified NSi sorbents were characterized by Fourier transform infrared, scanning electron microscopy, transmission electron microscopy, and thermal gravimetric analysis. NSi-Ox and NSi-Tar sorbents were examined for the removal of Co(II) from aqueous solutions by the batch adsorption technique. Removal of Co(II) was carried out at different controlling parameters such as pH, contact time, sorbent mass, and interfering ions. The maximum Co(II) uptake values were identified as 733.3 and 1026.7 μmol g−1 for NSi-Ox and NSi-Tar, respectively, and these were higher than the identified value by NSi sorbent (440 μmol g−1). This trend is mainly due to the surface functionalization with several active groups. The adsorption isotherms were evaluated using Langmuir and Freundlich models and the results were better fitted to the Langmuir model ( R2 = 0.983 and 0.989 for NSi-Ox and NSi-Tar, respectively). Kinetic studies were performed and the experimental data were found in good agreement with the pseudo-second-order model. The thermodynamic parameters were also determined. The potential applications of NSi sorbents for removal of Co(II) from drinking tap water and sea water samples were successfully achieved using microcolumn studies.
- Subjects
ADSORPTION (Biology); CARBOXYLIC acids; COBALT; OXALIC acid; TARTARIC acid; WASTEWATER treatment
- Publication
CLEAN: Soil, Air, Water, 2016, Vol 44, Issue 8, p1011
- ISSN
1863-0650
- Publication type
Article
- DOI
10.1002/clen.201500012