表面活性剂(十六烷基三甲基溴化铵)辅助合成Bi_(2)MoO_(6)光催化剂协同PMS降解AO7

Surfactant(cetyl trimethyl ammonium bromide)assisted synthesis of Bi_(2)MoO_(6)photocatalyst and PMS assisted degradation of AO7

采用CTAB辅助水热法合成钼酸铋(Bi_(2)MoO_(6),BMO)微球,并将其用于活化过一硫酸盐(PMS),在可见光下降解废水中的偶氮染料金橙Ⅱ(AO7).利用X射线衍射(XRD),傅里叶红外光谱仪(FT-IR),扫描电子显微镜(SEM),X射线能谱(XPS),透射电子显微镜(TEM)和紫外-可见漫反射光谱(UV-vis)对催化剂进行了表征,并通过降解实验测试其催化性能.结果表明,合成的催化剂具有良好的吸附、催化降解AO7的性能.在中性条件下,催化剂投加量0.3 g·L^(−1),AO7浓度0.1 mmol·L^(-1),PMS浓度1 mmol·L^(−1),可以在30 min内完全降解AO7.研究了催化剂含量、pH、共存阴离子等对AO7降解效果的影响.通过自由基消除实验,探索了0.10CTAB-BMO/光/PMS体系中存在的活性物种(h^(+)、·O_(2)^(−)、^(1)O_(2)、·OH和SO_(4)·^(−))和可能的降解途径.通过5次连续去除实验,该体系仍然可以在60min内完全降解AO7.

Bismuth molybdate(Bi_(2)MoO_(6),BMO)microspheres were synthesized by CTAB-assisted hydrothermal method.The degradation of azo dye OrangeⅡ(AO7)by the BMO-activated persulfate(PMS)in wastewater under visible light was studied.The catalysts were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),X-ray energy spectrum(XPS),transmission electron microscopy(TEM)and UV-visible diffuse reflection spectroscopy(UV-vis),respectively.The catalytic performance of catalysts was tested by degradation experiments.Results show that the catalyst as prepared show a good adsorption and degradation performance for AO7.Under the neutral condition,AO7 could be completely degraded within 30min as the catalyst dosage was 0.3 g·L^(-1),AO7 concentration was 0.1 mmol·L^(-1)and PMS concentration was 1 mmol·L^(-1),respectively.The effects of catalyst content,pH and coexisting anions on the degradation of AO7 were studied.The active species(h^(+),·O_(2)^(−),^(1)O_(2),·OH和SO_(4)·^(−))and possible degradation pathways of 0.10CTAB-BMO/photo/PMS system were explored by free radical elimination experiments.The AO7 could be degraded completely by this system in 60 mins after 5 consecutive removal experiments.