Transformation of Polyconjugation Systems as a Factor of Enhancing the Sorption Activity of Peat upon Its Modification with Phosphoric Acid and Organic Acids

摘要

The treatment of peat with the solutions of phosphoric, citric, and oxalic acids in concentrations of 10~(-4) and 10~(-2) mol/1 at solid phase to liquid ratios of 1 : 2.5 and 1 : 5 increased the absorption of ammonia by 6.4-39.7%. The absorption of ammonia was higher than the concentration of doping ion-exchange groups by a factor of 5-2000. With the use of EPR and IR spectroscopy, it was found that this phenomenon was caused by the transformation of polyconjugation systems as a result of the interaction of acids with the organic matrix of peat by a macrocoordination mechanism, which also improved the technological characteristics of the resulting sorbents. The absence of the destruction of organic matter with the use of low concentrations of weak acids makes it possible to use these sorbents after operation in gas-purifying equipment as organic fertilizers enriched in nitrogen.