Abstract
Montmorillonite (Mt) and acid modified montmorillonite (MtA) were tested as nicotine adsorbents. The samples were characterized using FT-IR spectroscopy and low temperature nitrogen physisorption. Nicotine adsorption was performed with respect to contact time, pH and initial nicotine concentration. The kinetics of adsorption obeyed the pseudo-second-order kinetics. The optimal pH values for nicotine adsorption were 6 and 9 for Mt and MtA, respectively. The isotherms related to adsorption on Mt at pH = 6 and 9 as well as for MtA at pH=6 were best fitted with Sips isotherm model, while adsorption onto MtA at pH=9 obeyed Langmuir isotherm model.
Highlights
Montmorillonite is naturally occurring, cheap and relatively abundant clay mineral that due to its adsorptive properties can be applied in environmental protection
The isotherms related to adsorption on Mt at pH = 6 and 9 as well as for MtA at pH=6 were best fitted with Sips isotherm model, while adsorption onto MtA at pH=9 obeyed Langmuir isotherm model
FT-IR spectra of nicotine, Mt and MtA are given in Fig. 1a along with the spectra of investigated adsorbents saturated with nicotine
Summary
Montmorillonite is naturally occurring, cheap and relatively abundant clay mineral that due to its adsorptive properties can be applied in environmental protection. It was reported as the adsorbent of many pollutants: inorganic [1], organic [2] including Nheterocyclic compounds [3, 4] as well as nuclear waste [5, 6]. Montmorillonite is superior as adsorbent, the obstacle to its wider application is difficulty in separation after wastewater treatment. This obstacle can be overcome by applying different sintered montmorillonite composites [7]. During sintering process radioactive nuclides in interaction with aluminosilicate montmorillonite matrix form thermodynamically sTab. structures that prevent leaching [8]
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