低有机碳含量表层土中Fe_2O_3对γ-666光解的催化作用

Effect of Fe_2O_3 on Photodegradation of γ-666 in Surface Soils with Low Amount of Organic Substance

考察 5种低有机碳含量天然土中Fe2 O3 光催化降解γ 666的光解动力学 ,γ 666的光解符合准一级动力学方程 .从所得的γ 666光解动力学常数可知 ,随Fe2 O3 质量分数从 0 4 0 %增加到 5 4 0 % ,γ 666的一级光解动力学常数也增大 ,且两者的线性相关系数为 0 95 2 ,其在 5种天然土中的半衰期随Fe2 O3 含量的增加依次为1 33 3h ,82 5h ,4 4 1h ,2 8 5h ,2 0 4h 由此可见 ,低有机碳含量天然土中Fe2 O3对γ

The photodegradation of γ 666 on surface soils with low amount of organic substance was studied. The results showed that photodegradation rate of γ 666 was fitted for pseudo one order kinetics. The constants of photodegradation rates increased from 0 0052h -1 to 0 0340h -1 with the increase of Fe 2O 3 contents between 0 40% and 5 40% in soils. These results showed that Fe\-2O\-3 in soils with low amount of organic substance had remarkable catalysis on photodegradation of γ 666.