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Kinetics and equilibrium isotherms of adsorption of Pb(II) and Cu(II) onto raw and arginine-modified montmorillonite.
- Source :
-
Advanced Powder Technology . May2019, Vol. 30 Issue 5, p1067-1078. 12p. - Publication Year :
- 2019
-
Abstract
- • Modification of Na-Mt with Arg salt is green and environmentally-friendly. • The isotherm model was well matched with the Langmuir curve. • The kinetic adsorption fitted well with the pseudo-second-order rate equation. • Arg-Mt removed 124.69 and 29.15 mg/g of Pb(II) and Cu(II) respectively. Arg-Mt, was fabricated by modifying sodium montmorillonite (Na-Mt) with Arginine monohydrochloride (Arg salt), to adsorb Pb(II) and Cu(II) in aqueous solution. The X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectrum, thermal analysis (TG/DTG), Brunauer-Emmett-Teller (BET) and Scanning electron microscope (SEM) were employed to investigate the properties of Na-Mt and Arg-Mt. The effects of the amount of modifier, pH value, the initial concentration of M(II), temperature and contact time were tested in a single adsorption system. The isotherm model was well matched with the Langmuir curve and the kinetic adsorption fitted well with the pseudo-second-order rate equation. The saturated adsorption of Pb(II) and Cu(II) by Arg-Mt were 124.69 and 29.15 mg/g, respectively, which were higher than that of Na-Mt (89.08 and 23.93 mg/g). The thermodynamic equation indicated that the adsorption process was spontaneous, endothermic, and the randomness of the samples changed a little after adsorption. The adsorption capacity of heavy metal ions in the binary co-adsorption system was poor than single adsorption system. Furthermore, the adsorbed M(II) onto Arg-Mt can hardly be dissolved under weak acidic condition (pH > 4) according to the desorption experiments. High-efficiency and low-cost make Arg-Mt to be used in the removal of heavy ions in aqueous solution. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09218831
- Volume :
- 30
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Advanced Powder Technology
- Publication Type :
- Academic Journal
- Accession number :
- 136013411
- Full Text :
- https://doi.org/10.1016/j.apt.2019.03.002