磁悬浮型硫氮共掺杂二氧化钛光催化剂降解甲基橙的研究

Preparation and photocatalysis of magnetically separated chromium and sulfur co-doped TiO_2 for degradation of methyl orange

以粉煤灰浮选出的磁性空心微珠为载体,以钛酸四丁酯为原料,以硫脲为添加剂,采用溶胶-凝胶-低温烧结法制备了可磁性分离回收的悬浮型硫氮共掺杂Ti O2复合光催化剂,研究了催化剂对甲基橙的光催化活性。结果显示,在可见光为光源的条件下,催化剂对甲基橙具有良好的光降解功效,在p H=6.3、催化剂用量为2 g/L、甲基橙初始质量浓度为10 mg/L的条件下,光照1.5 h后,降解率达到93%。催化剂可通过磁铁进行液固分离回收,干燥活化后对甲基橙的降解率仍在80%以上。

The novel chromium and sulfur co-doped TiO2( M-Cr/S /TiO2) photocatalyst were prepared by sol-gel method at low calcination temperature based on magnetical hollow fly ash micro-sphere. The catalyst on the photocatalytic activities of methyl orange. The results showed that catalyst exhibited good photocatalytic activity for photocatalytic decomposition of methyl orange in the condition of p H was 6. 3,the dosage of catalyst was 2 g / L,and the mass concentration of methyl orange was 10 mg / L. After illumination1. 5 h,the degradation efficiency up to 93%. The catalyst can be recovered by liquid-solid separation magnet,the degradation efficiency was still above 80%.