Fenton试剂ZnFe_2O_4光催化剂的合成及催化降解有机染料废水性质的研究

Synthesis of Fenton Reagent of ZnFe_2O_4 Photocatalyst and Study of Its Performance of Catalytic Degradation of Organic Dye in Wastewater

通过水热法制备了纳米ZnFe2O4,研究了合成条件对其结构、形貌和光催化性质的影响。确定了当金属离子与聚乙二醇(PEG)的摩尔比为1∶3、水热温度为200℃时ZnFe2O4的颗粒尺寸小,分散均匀,光催化性能最好(99.75%)。研究了双氧水加入量、紫外光等条件对光催化性质的影响并发现,2mL H2O2以及254nm紫外光照射下ZnFe2O4的光催化效果较高。通过研究光催化降解机理发现,ZnFe2O4在紫外光-双氧水共同存在的条件下,三者相互协同作用迅速产生.OH,氧化分解有机染料,达到迅速光催化降解的目的。

The nano-ZnFe2O4 was prepared by hydrothermal method. The effect of the synthetic conditions on the structure, morphology and the properties of photocatalytic degradation was studied. It was determined that when the molar ratio of cationic ions and PEG was 1 ： 3 and the calcination temperature was 200 ℃, the size of ZnFe2 04 particles was the smallest,dispersal was homogeneous and ZnFe2 04 showed the best photoeatalytic performance（99. 75%）. The higher photocatalytie performance of ZnFe2 04 was obtained under the condition of adding 2 mL H2 02 and irradiation by 254 nm ultraviolet. It was found that · OH was produced rapidly by synergistic reaction of ZnFe2 04-UV-H2 02 to oxidize and de- grade the organic dye.