硼铈共掺杂纳米TiO2光催化降解三氯杀螨醇和菊酯类农药

采用溶胶-凝胶法在钛酸丁酯水解过程引入硼酸、硝酸铈，制备具有光催化活性的硼铈共掺杂纳米二氧化钛（TiO2），经XRD、TEM、FT-IR、UV-Vis-DRS表征晶体结构，在日光灯照射下，光催化降解三氯杀螨醇、高氟氯氰菊酯、氟戊菊酯农药。结果表明：硼铈共掺杂的TiO2只有锐钛矿型，而纯的或掺铈的TiO2有含有锐钛矿型、金红石相和少量板钛矿型，UV-Vis-DRS测定结果表明硼铈共掺杂的TiO2禁带宽度变小，硼铈共掺杂的TiO2在可见光区吸光度高于掺杂铈和不掺杂的TiO2，在420nm~850nm有强的吸收；在同样光照下对三氯杀螨醇、高氟氯氰菊酯、氟戊菊酯的降解试验证明硼铈共掺杂纳米TiO2的光催化活性高于不掺杂或只掺杂铈的TiO2。

Photocatalytic Degradation of Dicofol and Pyrethrum with Boric and Cerous Co‐doped TiO2 under Light Irradiation

Boric and cerous co‐doped nano titanium dioxide (B/Ce co‐doped TiO₂) was synthesized using a sol‐gel technique, which involved the hydrolyzation of tetrabutyl titanate with the addition of boric acid and cerous nitrate. The B/Ce co‐doped TiO₂ was employed for the photocatalytic degradation of dicofol, cyfluthrin and fenvalerate under light irradiation. XRD, TEM, FT‐IR and UV‐Vis DRS methods were used to characterize the crystalline structure. Experimental results showed that only the anatase signal phase was found for B/Ce co‐doped TiO₂, but multiplicate phases, including anatase, rutile and less brookite phases, were identified both in the pure TiO₂ nanoparticles and Ce‐doped TiO₂ nanoparticles. The band gap value of B/Ce co‐doped nano TiO₂ was narrower than that of undoped nano TiO₂. Compared to undoped TiO₂, a stronger absorption in the range of 420 to 850 nm was found for B/Ce co‐doped nano TiO₂, which presented a higher photocatalytic activity in the degradation of dicofol, cyfluthrin and fenvalerate than both Ce doped nano TiO₂ and pure nano TiO₂ under the same light irradiation.