纳米Ag/TiO2对溴虫腈的光催化降解

用紫外杀菌灯为光源,Ag/TiO2,SDS/Ag/TiO2和TiO2作光催化剂对悬浮液中溴虫腈进行光催化降解,并采用高效液相色谱、液-质联用仪和紫外-可见分光光度计对降解过程浓度变化进行分析。研究结果表明:在100mL混合中性溶液中,当溴虫腈质量浓度为100mg/L、催化剂质量浓度为1.0g/L、温度为室温条件下,溴虫腈5h的降解率分别为78%,65%和55%(空白实验为32%)。用上述3种催化剂为光降解源和空白实验制备4种纳米农药水乳剂,于玻璃上涂膜后在相同条件下进行太阳光降解实验,各制剂中溴虫腈降解率分别为62%,53%,34%和13%;在酸性条件下,溴虫腈分子和催化剂的吸附及氢键的形成十分有利,这有利于溴虫腈的降解;紫外光、太阳光下溴虫腈分解的主要中间产物为氯苯,其他中间产物含量较少。

Photocatalytic degradation of chorfenapyr on nano-Ag/TiO2

The photocatalytic degradation of chorfenapyr in solution was carried out with Ag/TiO2,SDS/Ag/TiO2 and TiO2 as photocatalyst during the irradiation of UV-bacteridal lamb and they were analyzed using HPLC,LS-MS and UV-vis spectrophotometer for the concentrations of degraded process.The results indicate that the degradation rates of chorfenapyr(100 mg/L) are 78%,65% and 55% respectively after 5 h irradiation when the dosage of photocatalyst is 1.0 g/L.The degradation rate is 32% in the blank test.Four kinds of pesticide nanoemulsions were prepared by Ag/TiO2,SDS/Ag/TiO2,TiO2 and blankness.The solar degradation experiments of chorfenapyr were carried out under the same condition after painting four kinds pesticide nanoemulsion films on glass surface.The degradation rates of chlorfenapyr are 62%,53%,34% and 13%,respectively.The quantitative calculation of chlorfenapyr indicates that it is beneficial to the absorbance of chlorfenapyr on photocatalyst and the formation of hydrogen bond in the acidic condition,which benefits the degradation of chlorfenapyr.The main intermediate product of chorfenapyr in the photodegradation is chlorobenzene,and there exists only a few other intermediate products.