纳米TiO2光催化降解有机磷农药的研究

通过实验,探讨了用纳米TiO2光催化处理有机磷农药模拟废水和实际应用的有机磷农药的可行性.实验表明,以测定不同时间PO43-的浓度来衡量有机磷的降解率,并以此来衡量有机磷农药及其中间产物降解的程度是合理的.光催化降解甲胺磷和水胺硫磷的结果,显示了有机磷农药的降解率与其结构有关.实际应用的有机磷农药也可用光催化降解.

Study on photocatalytic degradation of organophosphorous pesticides with TiO2 nanometre powder

The photocatalytic degradation of organophosphorous pesticides and commercial organophosphorous pesticides by TiO2 nanometre powder was studied in this paper. It is showed that the degradation efficiency of methamidophos indicating by PO43-is better than indicating by methamidophos. This method is not only convenient but also showing the degree of complete degradation of organophosphorous pesticides and intermediates. It is showed that the degradation efficiency of organophosphorous pesticides is related to their structure by the photocatalytic degradation of methamidophos and isocarbophos. The order of photocatalytic degrada-tion of commercial organophosphorous pesticides is not coincident with that of pure organophosphorous pesticides, because the commercial organophosphorous pesticides contain a large mount of solvents. It is proved by the result of photocatalytic degradation of pure methamidophos and commercial methamidophos.