磷钼酸铋光催化降解亚甲基蓝

Photocatalytic Degradation of Methylene Blue by Phosphomolybdate Bismuth

采用微波固相法,以硝酸铋、钼酸铵、磷酸二氢铵为原料合成了磷钼酸铋,用FT-IR、XRD、PL等对磷钼酸铋的结构和电子-空穴对的复合性能进行表征。在紫外光下降解亚甲基蓝为研究对象,考查磷钼酸铋光催化剂的光照时间、催化剂用量、亚甲基蓝初始浓度、亚甲基蓝初始酸度等因素对亚甲基蓝降解的影响。实验结果表明:合成的磷钼酸铋具有Keggin结构,通过降低光生电子和空穴的复合几率,提高催化剂的光催化活性。在紫外光照射时间60min,催化剂用量为0.6g,亚甲基蓝溶液初始浓度为20mg/L,溶液的pH值为5时,亚甲基蓝降解率可达98.4%。

It was synthesized by microwave solid-phase phosphomolybdate bismuth with bismuth nitrate, ammonimn molybdate, ammonium dihydrogen phosphate as raw material. Using FT-IR, XRD and PL were characterized. The structure and the compositionality of electronic-hole were characterized by means of FT-IR, XRD and PL. The methylene blue solution was degraded under the ultraviolet light. Degradation effects of the methylene blue were investigated hy illumination time, catalyst dosage, initial concentration of methylene blue and the initial acidity of methylene blue on the phosphomolybdate bismuth photocatalyst. The experimental results show that the phosphomolybdate bismuth was Keggin-type structure, and lower electronic-hole composite, and then improve the photocatalytic activity of the catalyst. Degradation rate couht reach 98.4% when the uv irradiation time was 60min, catalyst dosage was 0.6g, methylene blue solution of the initial concentration was 20rag/L, the solution pH valuewas 5.