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研究了H2O2光降解动力学机理及其降解液的毒性.结果表明,光照对H2O2降解农药有显著影响,农药降解率随反应时间延长而增加.有机磷农药的H2O2光催化降解符合零级反应动力学,其反应速率常数(k)随农药浓度的增加而增大,半衰期(t0.5)延长.用生测法测定降解液残留物的毒性发现,H2O2光催化降解农药是降毒降解的.10μg/mL甲胺磷、10μg/mL毒死蜱、100μg/mL久效磷的H2O2光催化降解初始反应液处理家蚕Bombyxmori2龄幼虫的24h死亡率分别为60%、100%、100%,而12h降解液的死亡率均小于5%.黄曲条跳甲Phyllotretastriolata生物测定所得结果与家蚕结果一致.
The kinetic mechanism of photodegradation of H2O2 and the toxicity of its degradation solution were studied.The results showed that light had a significant effect on the degradation of pesticides by H2O2 and the degradation rate of pesticides increased with the reaction time.Photocatalytic degradation of organophosphorus pesticides met the zero-order reaction kinetics The reaction rate constant (k) increases with the increase of pesticide concentration and the half-life (t0.5) prolongs.The toxicity of degradants residue by bioassay method is found that degradation of pesticides by H2O2 is detoxification and degradation. The 24 h mortality of the 2nd reaction of Bombyx mori 2 instar larvae treated with 10μg / mL methamidophos, 10μg / mL chlorpyrifos and 100μg / mL monocrotophos was 60%, 100% and 100%, respectively. The 12h degradation solution Mortality were less than 5% .The results obtained by the biological assay of Phyllotretastriolata of Tribulus terrestris agree with that of silkworm.