CATALYTIC WET PEROXIDE OXIDATION PROCESS WITH NEW Fe/Cu/Zr-PILLARED CLAYS DEVELOPED FROM NATURAL CLAY DEPOSITS OF KAZAKHSTAN
Ключевые слова:natural clays; pillared clays; catalytic wet peroxide oxidation; 4-nitrophenol; wastewater.
This work deals with the development of materials based on natural clays and on pillared clays. The
modification of natural clays with zirconium, zinc and iron ions allows to increase their performance as adsorbents or
catalysts in the treatment of environmentally hazardous compounds found in wastewater. Clay-based materials were
obtained from natural clays and assessed in the treatment of wastewater using model pollutants in aqueous solutions.
The natural clays were collected from 3 different deposits of Kazakhstan and tested in the catalytic wet peroxide
oxidation (CWPO) of 4-nitrophenol (4-NP) at mild conditions (50 ºC, initial pH of 3.0, C4-NP = 5 g/L and
Cclay = 2.5 g/L). Fe/Cu/Zr-pillared clays were developed from natural clays and also assessed in the CWPO of 4-NP.
Complete removal of 4-NP was achieved after 2 h of reaction time with all pillared clays, and TOC removals up to
78 % after 8 h were reached at those conditions.