Plasma-catalytic degradation of anthraquinonic acid green 25 in solution by gliding arc discharge plasma in the presence of tin containing aluminophosphate molecular sieves

In this paper, the plasmacatalytic removal of an anthraquinonic dye type acid green 25 (AG 25) in aqueous solutions has been investigated in the presence of microporous tin containing aluminophosphates as catalysts under a gliding arc discharge plasma. The catalysts have been synthesised in AEL and AFI structure types by static hydrothermal crystallisation. These materials were characterised by elemental analysis, X-ray diffraction, scanning electron microscopy, N-2 adsorption measurements (BET) and Mossbauer spectroscopy. These analyses showed significant catalytic properties of these materials. The degradation process has been monitored during the experimental runs through UV/visible spectroscopy and chemical oxygen demand (COD). The results showed a good synergetic effect between the tin-containing aluminophosphate particles and the highly reactive plasma species. Moreover, it was found that these catalysts can be reused several times. Kinetics of the dye removal has also been investigated on the basis of the Langmuir-Hinshelwood (L-H) model. (C) 2014 Elsevier B.V. All rights reserved.