Fe3O4@NiSiO3催化剂制备及其催化芬顿氧化降解染料性能研究

通过溶剂热法和溶胶凝胶法制备Fe₃O₄@NiSiO₃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,由单因素实验得出在最佳降解条件为, pH值为5.5、催化剂投加量为1.00 g.L_-1、H₂O₂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Fe₃O₄@NiSiO₃纳米催化剂重复利用性能良好。同时,考察了该催化剂对其它四种染料：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。

Preparation of Fe3O4@NiSiO3 Nanocatalyst and Study on Performance of Catalytic Fenton Oxidation to Degradation Dye Wastewater

The Fe₃O₄@NiSiO₃ nanoparticle was synthesized by solvothermal method and sol-gel method. It was characterized by XRD, TEM, BET and VSM. We used it 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@NiSiO_3,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.