| FORMULA | Naphthalene-1-(O-CO-NH-Me) |
| METHOD |
The problem of pesticides in aqueous systems has been a focus of authors. They have been investigating an electrochemical version of the Fenton reaction for degrading water-soluble pesticides, such as atrazine and carbaryl. In the future, farmers might use a flow-through system in the farmyard to treat water contaminated when, say, they rinse their spray applicators. In the Fenton reaction, ferrous ion reacts with hydrogen peroxide, producing ferric ion, hydroxyl ion, and hydroxyl radical: Fe2+ + H2O2 j Fe3+ + OH–+ OH "Hydroxyl radicals react with everything. "They're good at breaking compounds down." In the classic Fenton reaction, ferrous sulfate is the usual starting material. Over the past decade, an electrochemical Fenton method, in which the source of the ferrous ion is a sacrificial iron anode, has been shown by a number of research groups to degrade a variety of pesticides. Controlling the current controls the rate of production of Fe2+. A drawback, however, is that the reaction tends to be slow. It runs best at acidic pH. but the cathode reaction in the electrochemical method produces hydroxyl ions as water is reduced, raising the pH of the system. Author`s group has addressed that difficulty by using two half cells, a method the researchers call anodic Fenton treatment. Hydrogen peroxide is continually pumped into the anodic half cell, which contains an iron plate immersed in aqueous solution of the pesticide to be degraded. The other half cell consists of an inert graphite cathode in water. The half cells are connected by a salt bridge or--in more recent work at Uni. -- an ion-exchange membrane. YOU GET ALL the efficiency of electrochemical delivery of Fe2+ at the right pH for the Fenton to occur. Authors have modeled the kinetics for the anodic Fenton method. "The model gives us rate parameters," she says. "We expect to use it as a probe for the reaction rates of hyroxyl radical with all kinds of pesticides." |
| UPDATE | 09.02 |
| AUTHOR | This data is not available for free |
| LITERATURE REF. | This data is not available for free |
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