疏水性可见光响应型纳米CuO/TiO_2催化降解高浓度硝基苯

Degradation of high concentration nitrobenzene using hydrophobic nano-CuO/TiO_2 under visible light

采用十二烷基硫酸钠(SDS)对纳米CuO/Ti O2光催化剂进行疏水改性,并在可见光的照射下,研究了疏水性CuO/Ti O2对硝基苯降解的影响因素。实验表明:SDS-CuO/Ti O2催化剂具备完整的锐钛矿和CuO晶体衍射峰;SDS负载量变化对催化剂的紫外可见吸收性能没有影响;催化剂表面的疏水位主要是长链烷基。各影响因素的最佳水平分别是:SDS负载量2.3 g.(2.5 g Ti O2)-1,初始浓度400～500 mg.L-1,催化剂用量0.2g.L-1,pH9,H2O2添加量6 ml.L-1。最佳条件下硝基苯2 h降解率为80%,4 h降解率为93%。

Hydrophobic CuO/TiO2 was prepared from nano-CuO/TiO2 and sodium dodecyl sulfate （SDS）. The influences on photocatalytic degradation of nitrobenzene using these catalysts under visible light irradiation were investigated. Characterization of the catalyst showed that SDS-CuO/TiO2 photocatalysts had complete diffraction peaks of anatase and CuO crystalloids, its UV-Vis absorption performances had nothing to do with the variations of SDS loadings, and hydrophobic sites on the catalysts surfaces were mostly long chain alkyls. Experiments indicated six factors having influence on the degradation of nitrobenzene and their best levels were determined respectively. SDS loading was 2.3g·（2.5g TiO2）^-1 Initial concentration of nitrobenzene ranged from 400-500 mg·L^-1. Dosage of catalysts and H2O2 were 0.2g·L^-1 and 6 ml·L^-1, respectively, pH was 9. Under these conditions, nitrobenzene degradation ratio was about 80% after irradiation for 2h and 93% for 4h.