The formation of nickel(II) chloride ammine complexes in the pores of modified fibers of cellulose cloth

Abstract

A sorbent was synthesized as a cellulose cloth, the fibers of which have nanopores with walls made of cellulose chains and ethanol cyclams. The formation of (NH₄)₂[NiL(NH₃)₂Cl₂] complexes where L^2– is the CH–(O^–)–CH–(O^–) glucopyranose group was established by chemical analysis and IR and UV/Vis spectroscopy. Using small-angle X-ray scattering and measurement of the partial free space and adsorption capacity, the complex formation in the [Ni(NH₃)₆]Cl₂ concentration range of up to 0.43 mol/L was found to occur in nanopores with the sorption constant K_sorb = 15.8. The limiting content of the complexes is 2.63 mmol/g and their effective radius is 0.45 nm. In the concentration range of 0.43–0.91 mol/L, the complexation occurs on the fiber surface, K_sorb = 1.85. The effective radius of the complexes is 0.5 nm.