Catalytic-Competition Effects of Humic Substances on Photolytic Ozonation of Organic Compounds
Peyton, GR; Gee, CS; Bandy, J; Maloney, SW
| HERO ID | 4933343 |
|---|---|
| In Press | No |
| Year | 1989 |
| Title | Catalytic-Competition Effects of Humic Substances on Photolytic Ozonation of Organic Compounds |
| Authors | Peyton, GR; Gee, CS; Bandy, J; Maloney, SW |
| Abstract | During the treatment of organic compounds in water with free-radical processes such as photolytic ozonation, humic substances are expected to compete with the target compound for hydroxyl radicals. Experimental studies were performed on the competitive effect of macromolecular humic substances during photolytic ozonation and H2O2-UV treatment of a model pollutant compound. None of the humic substances interfered as effectively with the photolytic ozonation of diethyl malonate as was expected from an estimate of the hydroxyl radical reaction rate constant based on the molecular weight of the humic substances and from the competitive behavior of polyethylene glycols in a similar molecular weight range. The apparent noncompetitive behavior of the humic substances implies the production of secondary species that catalyze the generation of additional hydroxyl radical from ozone and thus counteract the competitive effect. (See also W90-01491) (Author 's abstract) |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | Water pollution treatment; Ozonation; Humic acids; Organic compounds; Free radicals; Kinetics |