Application of XPS method in the research into Ni ion-modified montmorillonite as a SO2 sorbent

A series of montmorillonites with adsorbed nickel ions was prepared through adsorption of nitrates from water solutions; there were four methods adopted. The surface of the sample under modification was investigated with the method of argon adsorption and XPS (X-ray photoelectron spectroscopy). SO2 was investigated on nickel-modified montmorillonites. Nickel cations were adsorbed on the montmorillonite surface as Ni2+ in Ni(OH)(2) or NiO. Montmorillonite - after nickel adsorption - adsorbs SO2 physically. An addition of Mont-Ni to hard coal in a ratio 1:500 reduces SO2 emissions in the combustion process by 75-85%. Waste bentonite can be utilized for reducing SO2 emissions after processing. (C) 2011 Elsevier B.V. All rights reserved.