Fe Doped Nano-titanium Dioxide On The Catalytic Properties Of The Organophosphorus Pesticides

Organophosphorus pesticides wastewater was characterized as high concentration of organic matter, high toxicity for biotic systems, biorecalcitrant, so it is always a difficult mission for wastewater disposal. Photocatalysis as an advanced oxidation processes is a very promising methods for its high oxidant power, no secondary pollution, and no selectivity when completely mineralizing varies pollutants to inorganic ions.Since the iron is cheap , plentiful, we use Fe³⁺ to modify TiO₂ and first use it to rearch treatment of Organophosphorus pesticides.The titanium dioxide sol was synthesized by sol-gel method with adulteration of Fe(NO₃)₃·9H₂O.The experimental results showed that titanium treated at 500℃and doped 0.05% had the best photocatalytic activity, The properties of the samples are characterized by means of XRD, DTA-TGA and UV-Vis.The particle size is 17.5 nm and pure anatase.from the UV-Vis the absorption edge of the iron-doped titania has a red shift and the sample also has a absorption than the puretitanic in the visible region.From the result of photocatalytic activity of low concentration omethoate. we have conclusion below:after 2h UV irradiation photocatalytic activity of Fe- TiO₂ is higher 18% than that of pure TiO₂. the prime dosage of photocatalytic is 0.2g/L, the prime pH is 8.6, the prime accession H₂O₂ is 120 Mmol/L,the removal rate of Organophosphorus pesticides is 81%,85.2%,98.91%.When treatment of higher concentration omethoate of 400mg/L, the result is :when the prime dosage of photocatalytic is 1.5g/L, it removal rate of organophosphorus pesticides,COD and TOC is 85.75%,89.24% and 89.81% respectly. when the prime pH is 8.2, it removal rate of Organophosphorus pesticides,COD and TOC is 87.55%,91.27% and 91.1% respectly. hen the prime accession H₂O₂ is 2ml/L, it removal rate of omethoate pesticides,COD and TOC is 98.8%,98.43% and 99.32% respectly.The paper rearch repeat useful and after two use the removal rate is stabilization.Finally The kinetic equation, expressed by the omethoate degradation, is given. The photocatalytic degradation kinetics followed pseudo-first order reaction.