无定形TiO_2纳米颗粒的制备及紫外光降解废水中的铬(Ⅵ)  

Preparation of Amorphous TiO_2 Nanoparticle and Its Activity on Removing Cr(Ⅵ)Ion of Waste Water under UV Irradiation

作　　者：姚文华[1] 秦云[1] 姜丽[1] 

机构地区：[1]保山学院资源环境学院,云南保山678000

出　　处：《湖北农业科学》2016年第5期1125-1128,共4页Hubei Agricultural Sciences

基　　金：保山学院校级课题项目(14B1019)

摘　　要：以重铬酸钾溶液为模拟废水,无定形Ti O2纳米颗粒为催化剂,用500 W高压汞灯作为光源照射样品,探讨光照时间、溶液p H、催化剂用量对铬(Ⅵ)离子去除率的影响。结果表明,在光照时间为3.0 h,催化剂用量为1.0 g/L,p H 2的条件下,催化剂有很高的光催化活性,铬(Ⅵ)离子的去除率高达98.95%。尤为值得注意的是,在中性条件下,无定形Ti O2纳米颗粒也显示了优越的光催化活性,铬(Ⅵ)离子的去除率达到了98.75%,与强酸性条件下的活性相当。这可能是光催化还原反应历程和导带、价带电位协同作用的结果。The effects of illumination time, p H values, catalyst dosage on photo-catalytic removing of Cr（Ⅵ） were studied using waste water containing dichromate as research system, amorphous Ti O2 nanoparticle as catalyst, high-voltage mercury lamp（500 W） as irradiation light. The results indicated that Cr（Ⅵ） could be photo-catalytic removed well, the removing rate of Cr（Ⅵ） ion reached 98.95% when irradiation light was 3 h, catalyst dosage was 1 g / L, p H was 2. It was worth noting that under neutral conditions, amorphous Ti O2 nanoparticle also showed higher photocatalytic activity, the removing rate of Cr（Ⅵ）ion reached 98.75%, and was about the same as under the strong acidic conditions. This might be attributed to the synergies effects of photocatalytic reduction mechanism, conduction band potential and valence band potential.

关 键 词：无定形 纳米Ti O2 光催化去除 铬(Ⅵ)离子 废水 

分 类 号：X52[环境科学与工程—环境工程]