Fe3O4@NiSiO3催化剂制备及其催化芬顿氧化降解染料性能

Preparation of Fe_3O_4@NiSiO_3 Nanocatalyst and Performance of Catalytic Fenton Oxidation to Degrade Dye Wastewater

通过溶剂热法和溶胶凝胶法制备Fe_3O_4@NiSiO_3纳米催化剂,并利用TEM、XRD、VSM、BET进行表征。构建非均相芬顿氧化体系,由单因素实验得出最佳降解条件为,pH为5.5、催化剂投加量为1.00 g·L^(-1)、H_2O_2投加量为2.5%时,罗丹明B的降解率达95%以上。利用磁性分离催化剂并重复利用5次,罗丹明B降解率无明显降低,证明Fe_3O_4@NiSiO_3纳米催化剂重复利用性能良好。同时,考察了该催化剂对其他4种染料:酸性大红3R、孔雀石绿、甲基橙、亚甲基蓝的催化芬顿氧化降解性能。结果表明,孔雀石绿、罗丹明B、亚甲基蓝的降解率均达95%,但偶氮类染料降解率较低。通过对比实验进一步研究表明,Ni元素对芬顿反应起促进作用。

The Fe3O4@NiSiO3 nanoparticle was synthesized by solvothermal method and sol-gel method. It was characterized by XRD,TEM,BET and VSM. It was used as heterogeneous Fenton catalyst to degrade rhodamine B. The optimal reaction conditions are 5. 5 of pH,1. 00 g·L^-1 of catalyst dosage and 2. 5% of H2O2 dosage,the degradation efficiency of rhodamine B reached over 95%. After reusing 5 times the degradation efficiency was still stable at 95%. Acid scarlet 3R,methyl orange,methylene blue,malachite green were also used as target pollutants to study on the Fenton catalytic performance of Fe3O4@NiSiO3,the degradation efficiency of all dyes except the azo-dye reached over 95%. The Fe3O4@NiSiO3 have good magnetic separability and recycling ability. Further research showed that Ni has a promoting effect on Fenton oxidation.