摘要
以复合金属氧(硫)化物为非均相类Fenton催化剂,以偶氮染料甲基橙为目标污染物,考察了催化剂、双氧水用量、溶液初始pH值等因素对染料色度和CODCr去除效果的影响。结果表明,在H2O2浓度为26.6 mg/L(0.2 mL/L 30%H2O2)、催化剂用量2 g/L、溶液初始pH值6左右的条件下,反应60 min后,染料CODCr去除率达65%左右,色度去除率在90%以上。同时,我们对该复合金属氧(硫)化物催化进行了多次循环使用,结果表明,使用8次,催化剂仍具有较高的活性,CODCr去除率在60%左右。复合金属化合物作为一种新的催化剂大大提高了类Fenton反应的催化活性,而且该新型类Fenton反应能克服传统Fenton反应适用pH范围小的局限性,拓展了Fenton反应在废水处理中的应用。XRD结果表明,该催化剂为Fe2O3、Fe3O4、FeOOH和FeS2的复合物,催化剂具有较高的活性可能与该催化剂中的多种物质的协同降解作用有关。
The effects of solution pH, H202 and catalyst dose on the removal rates of CODcr and color were studied through the mixed metal oxides as heterogeneous Fenton catalyst and the Azo dye methyl orange as target pollutants. The results showed that about 90% of color removal rate and 65% of CODcr removal rate can be achieved at pH = 6 after 60 min of reaction with 0.2 mL/L H202 （30%） and 2 g/L catalyst. Moreover, the catalytic activity was slightly affected by the solution pH in a wide range of 5.0-9.0. It could maintain high aetivity with 60% CODe removal after eight times. The mixed metal oxides as a new catalyst can greatly improve the catalytic activity of Fenton-like reaction, which could overcome the limitations of traditional Fenton reaction at lower pH, and expand the application of Fenton in wastewater treatment. The catalyst was characterized by XRD and XPS. XRD and XPS results showed that the catalyst contained Fe203, Fe304, FeOOH and FeS2 complexes. The catalyst had higher activity might be associated with synergistic reaction of degradation on a variety of oxides.
出处
《浙江化工》
CAS
2013年第8期34-39,共6页
Zhejiang Chemical Industry
基金
绍兴县印染集聚区20万t/a工业废水集中深度处理与回用技术开发(Y201204)
