二氧化钛催化臭氧化对有机物的去除效能及载体的影响(英文)

Removal efficiency of organic compounds in TiO_2 catalytic ozonation using different supports

制备了负载于不同载体上的纳米二氧化钛催化剂并将其应用于催化臭氧化工艺,研究了催化臭氧化松花江水过程中有机物的去除与变化。经GC-MS检测,松花江原水中含有50种有机物,大部分为酯类。经单独臭氧氧化之后,水中仍剩余36种有机物,单独臭氧化对有机物总峰面积的去除率为23.5%。纳米二氧化钛催化臭氧化工艺能够大幅提高对有机物的去除效率,特别是对酸和酯类物质的去除。二氧化钛的催化能力在一定程度上受载体的影响,用沸石作载体时的催化臭氧化效果要优于用硅胶和陶粒作载体。以二氧化钛/沸石为催化剂时,催化臭氧化处理后水中仅残留20种有机物,对有机物总峰面积的去除率也高达62.5%。

Nano-TiO2 loaded on different supports was prepared and used as the catalyst in catalytic ozonation process.Removal and transformation of organic compounds in Songhua River water by the catalytic ozonation was investigated.50 species of organic compounds were detected in the raw Songhua River water using GC-MS,and most of them were esters.After treated by ozonation,36 species of organic compounds were remained in the water and the removal efficiency of the total peak area was 23.5%.Catalytic ozonation using nano-TiO2 as the catalyst could improve the removal of organic compounds greatly,especially the removal of acid and ester compounds.Catalytic ability of TiO2 was affected by the supports to some extent,and using Zeolite as the support was better than using Silica-gel and Ceramic.Only 20 species of organic compounds were remained after treated by TiO2/Zeolite catalytic ozonation,and the removal efficiency of the total peak area was 62.5%.