nitrophenols and ferric-chloride

Fe(III) supported on resin (Fe(III)-resin) as an effective catalyst for peroxide oxidation was prepared and applied for the degradation of p-nitrophenol (PNP). Catalytic wet peroxide oxidation (CWPO) experiments with hydrogen peroxide as oxidant were performed in a batch rector with p-nitrophenol as the model pollutant. Under given conditions (PNP concentration 500 mg/L, H(2)O(2) 0.1 M, 80°C, resin dosage 0.6% g/mL), p-nitrophenol was almost completely removed, corresponding to an 84% of COD removal. It was found that the reaction temperature, oxidant concentration. and initial pH of solution significantly affected both p-nitrophenol conversion and COD removal by oxidation. It can be inferred from the experiments that Fe(III) supported on resin was an effective catalyst in the mineralization of p-nitrophenol. In an acidic environment of oxidation, the leaching test showed that there was only a slight leaching effect on the activity of catalytic oxidation. It was also confirmed by the aging test of catalysts in the oxidation.

Topics: Biological Oxygen Demand Analysis; Catalysis; Cation Exchange Resins; Chlorides; Ferric Compounds; Hydrogen Peroxide; Hydrogen-Ion Concentration; Microscopy, Electron, Scanning; Nitrophenols; Oxidation-Reduction; Surface Properties; Water Pollutants, Chemical; Water Purification

Dilute FeCl3 and Fe(NO3)3 solutions degraded parathion to paraoxon and p-nitrophenol. Initial hydrolysis products of iron appeared to have the greatest catalytic activity which decreased as these hydrolysis products aged. The Fe3+ ion was less catalytically active than its hydrolysis products for parathion degradation. pH was not a factor in parathion degradation in this study. AlCl3 solutions did not degrade parathion over a 336 hour period. DDT was stable in dilute FeCl3 and Fe(NO3)3 solutions for at least 56 days.

Topics: Chlorides; DDT; Drug Stability; Ferric Compounds; Half-Life; Hydrolysis; Iron; Nitrates; Nitrophenols; Paraoxon; Parathion