CAJ | 학술논문

以钛酸四丁酯[CH3(CH_2)3O]4Ti]为钛源,硝酸铁[Fe(NO_3)_3·9H_2O]为改性剂,采用溶胶-凝胶法合成了掺铁纳米TiO_2催化剂.纳米TiO_2的最佳掺铁量为0.05%,最佳煅烧温度为500℃.采用X射线衍射、热重-差热、紫外-可见光谱对其结构进行了表征.结果表明,500℃时煅烧的掺铁0.05%的TiO_2为锐钛矿型,晶粒粒径为17.5 nm,其光谱吸收边带发生了红移,吸收强度增大.对50 mg/L氧化乐果溶液的光催化降解实验表明,当光催化剂的最佳用量为0.2 g/L、溶液pH为8.6时,250 W高压汞灯照射2.5 h,乐果的降解率达到了85.23%,降解反应符合一级动力学方程.
이태산사정지[CH3(CH_2)3O]4Ti]위태원,초산철[Fe(NO_3)_3·9H_2O]위개성제,채용용효-응효법합성료참철납미TiO_2최화제.납미TiO_2적최가참철량위0.05%,최가단소온도위500℃.채용X사선연사、열중-차열、자외-가견광보대기결구진행료표정.결과표명,500℃시단소적참철0.05%적TiO_2위예태광형,정립립경위17.5 nm,기광보흡수변대발생료홍이,흡수강도증대.대50 mg/L양화악과용액적광최화강해실험표명,당광최화제적최가용량위0.2 g/L、용액pH위8.6시,250 W고압홍등조사2.5 h,악과적강해솔체도료85.23%,강해반응부합일급동역학방정.
Titanium dioxide sol was synthesized by sol-gel method with adulteration of Fe(NO_3)_3·9H_2O. The samples were characterized by XRD, DTA-TG and UV-Vis. The results show that the diameter of particles is 17.5 nm and pure anatase. From the UV-Vis spectra the absorption edge of iron-doped titania has a red shift and the absorption intensities are increased. The degradation rate of omethoate reaches 85.23% when the dosage of photocatalyst is optimally 0.2 g/L, pH=8.6 and 2.5 h illumination with high-voltage mercury lamp. The photocatalytic degradation kinetics follows the pseudo-first order reaction.