纳米TiO2的低温制备及光催化降解有机磷农药

Low temperature preparation of nano-TiO2 and photocatalytic degradation of organic phosphorus pesticides

以TiCl4为钛源,苯甲醇、叔丁醇或异丙醚为氧供体,采用非水溶胶凝胶法低温制备纳米TiO2粉末。XRD、TEM及比表面积测试结果表明:以苯甲醇为氧供体,在50℃下制备的样品具有较好的锐钛矿结晶度,比表面积为110.67m2/g,粒径为30~50nm。以毒死蜱和乐果为目标降解物,研究所制备的纳米TiO2的光催化性能。以苯甲醇为氧供体制备的样品,其光催化活性与DegussaP25商品TiO2相当,反应140min毒死蜱和乐果的消失率分别为92.4%和75.7%,降解率分别为52.1%和42.7%。

Nano-TiO2 powder was prepared by nonhydrolytic sol-gel method at low temperature using benzyl alcohol, tert-butyl alcohol or isopropyl ether as oxygen donor and TiCl4 as titanium source. The results of XRD, TEM and specific surface area test showed that, the sample prepared at 50 ℃ with benzyl alcohol as oxygen donor showed good anatase crystallinity, which characterized by 110.67 m2/g of specific surface area and 30 - 50 nm of particle size. Taking chlorpyrifos and dimethoate as objective degradation products, the photocatalytic performance of the prepared nano-TiO2 was studied. The photocatalytic activity of the samples prepared with benzyl alcohol as oxygen donor was similar to that of the sold TiO2 Degussa P25, the elimination rates of chlorpyrifos and dimethoate were 92.4% and 75.7% respectively after 140 min of reaction, the degradation rates were 52.1% and 42.7% respectively.