Pesticide Pollution Treatment by Potassium Phosphotungstate
Chlorothalonil is an efficient fungicide absorbed in organic pesticide, organic compounds but it is also easy to cause pollution of soil.
In the process of agricultural operations, the land often contains chlorothalonil which is difficult to degrade, not only the soil ecological structure is affected, but it is often washed by rainwater to enter the river or infiltrate the ground water, causing serious pollution.
In recent years, with the tungsten based photocatalyst for environmental, economic, effective and has become a new method for the treatment of organic wastewater, some scholars have found that most of the organic pesticides is easily degraded and mineralized into H2O and CO2 and other small molecules, so the photocatalytic degradation of chlorothalonil is feasible.
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Tungsten photocatalysts mainly consist of tungstate and tungsten heteropoly acids, the commonly used method is to use a combination of loading and photocatalyst to form a new composite preparation for photocatalytic work, a common load has cloth, holes, sieves, or other chemicals. Some scholars believe that phosphotungstic acid has good degradation effect on chlorothalonil, and in order to verify his opinion, potassium chloride is used to degrade phosphotungstic acid.
During the experiment, he added potassium chloride and phosphotungstic acid to 2.5:1 in proportion to H3PW12O40 water solution and stirred it to produce a white precipitate, continue to stir 10h until the precipitation is complete, centrifugal separation, washed with deionized water, white precipitate to no Cl, and then dried, baking at 300 hours, made into potassium tungstate.
Through the contrast test of two chlorothalonil solution showed that potassium phosphotungstate catalyst of chlorothalonil solution has good photocatalytic effect, not only this, have the effect of all similar pesticides, and very small amount of it. It is estimated that 1 grams of potassium phosphotungstate degradable 10L chlorothalonil solution (5mg/L), light degradation time is 4 hours, the degradation rate is 86.22%, the effect is ideal. And the use is also very convenient, that is, before the allocation of pesticides, according to the proportion of phosphorus potassium tungstate stirring can be used.
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