摘要
以TiO2作为光催化氧化剂降解有机磷农药乐果,用磷钼蓝分光光度法测定降解后乐果溶液中的磷酸根浓度。研究有机磷农药乐果在不同时间、温度和TiO2质量浓度条件下的降解。不同温度下,向质量浓度为100mg/L的乐果中加入不同质量浓度的TiO2光催化剂(调至pH=7.0),测定乐果的降解量。结果表明,乐果降解的适宜时间为6h,适宜TiO2质量浓度为1000mg/L,适宜降解温度为30℃。本文为TiO2对乐果光催化降解影响的进一步研究提供了参考。
The paper presents the author＇ s finding of the influence of the TiO2 photocatalyfic degradation on the organophosphorus pesticide rogor. To be sure, the concentration of phosphate, which measures with colorimetry, denotes the degradation of rogor. The results of our research show that the increase of illumination time and TiO2 mass concentration tends to accelerate the degradation rate noticeably. Besides, the illumination time and TiO2 concentration also serve the primary factors exerting influence on the degradation. To be exact, when the mass concentration of the rogor solution is 100.0 mg· L^- 1, the degradation rate would be relatively high for a given period of time, say, 6 hours. However, the degradation rate tends to drop with the testing time prolonging. When the mass concentration of TiO2 is going up from 600 mg· L^- 1 to 1 000 mg· L^- 1, the degradation rate of rogor is comparatively high; however, it would debase when the mass concentration of TiO2 is going up from 1 000 mg· L^- 1 to 6 000 mg· L^- 1. Furthermore, the rate would be relatively high at a given temperature, say, 30 ℃. Thus, a series of experimental investigation data gained through our research has proven the prime time of the photocatalytic degradation of organophosphorus pesticide of rogor by using fixed TiO2 at the mass ：concentration of 100.0 mg·L^- 1 （pH = 7.0） is 6 h , with the prime mass concentration of TiO2 is 1 000 mg· L^- 1, and the prime temperature being 30℃ .
出处
《安全与环境学报》
CAS
CSCD
2008年第3期82-84,共3页
Journal of Safety and Environment
基金
国家自然科学基金项目(20576004)
关键词
环境工程学
有机磷农药
乐果
光催化
降解
TIO2
environmental engineering
organophosphorus pesticide
rotor
photocatalysis
degradation
TiO2
