自掺杂改性Bi_4O_5X_2(X=Br,I)异质结催化剂的合成及在油田废液处理上的应用

通过调控原料中五水硝酸铋和卤源的比例制备了自掺杂改性Bi_4O_5X_2(X=Br, I)光催化材料,Bi_4O_5X_2(X=Br,I)光催化性能得到明显提升.分别用X射线衍射仪分析催化剂的晶体结构、环境扫描电子显微镜观测催化剂的形貌、紫外可见漫反射分光光度仪测试催化剂的光吸收性能、 ST-MP-9全自动比表面积测试仪测试催化剂的比表面积.通过测定光降解油田污染物丙烯酰胺的吸光度值和化学需氧量(COD)值的变化研究了催化剂的催化活性.结果表明,经过5 h的紫外可见光光降解反应,Bi_4O_5Br_2-Bi2.6降解丙烯酰胺的性能最好,降解率达到58.2%、 COD值降低87.1%.

Self-doped Synthesis of the Bi4O5X2 (X=Br, I) Heterojunction Catalysts and Application in Degradation Oil Field Waste

The Bi₄O₅X₂ (X=Br, I) photocatalysts were modified by the element self-doped that controlling the molar ratio of bismuth nitrate pentahydrate and halide source. X-ray diffraction analyzed the crystal phase(DRS) of photocatalyst, environmental scanning electron microscope observed morphology(SEM) of photocatalyst, UV-vis diffuse reflectance spectroscopy (DRS) analyzed optical absorption properties of photocatalyst, the specific surface area of the photocatalyst were tested by the ST-MP-9 automatic specific surface area tester. The photocatalytic activity of photocatalysts were evaluated by degradation the acrylamide, which measured the change value of absorbance and COD. Under UV-visible irradiation 5 h, the result showed that Bi₄O₅Br₂-Bi2.6 exhibited excellent photocatalytic activity, the degradation acrylamide rate was 58.2% and the COD value was reduced by 87.1%.