纳米铁酸镍的制备及可见光催化性能研究

Preparation of Nano NiFe2O4and Their Catalytic Properties under Visible Light Irradiation

利用水热法制备了纳米铁酸镍,表征了其微观结构和光谱性能,并以罗丹明B溶液作为目标污染物,研究了铁酸镍催化剂的可见光催化性能。结果表明:所制备铁酸镍的微观形貌为由直径200-300 nm左右的类似球形小颗粒组成的大颗粒,平均粒径为95.60 nm,在紫外-可见光谱区均有较强的光吸收。光催化过程中催化剂的适宜用量为0.05 g,少量H2O2的加入有助于提高罗丹明B溶液的降解率。催化剂用量为0.05 g,加入0.4 mL 30%的H2O2,降解50 mL 20 mg/L罗丹明B溶液,模拟太阳光照射240 min后降解率能够达到99.2%。在实际太阳光照射下,240 min后罗丹明B溶液的降解率可以达到85.2%。

NiFe2O4 nanoparticles were prepared by hydrothermal method, and their microstructures and spectral properties were characterized using various modem instrumental analysis techniques. Visible light induced photocatalytic activity of the samples was studied using Rhodamine B （Rh B）solution as the target pollutant. Results indicated that NiFe2O4 samples were composed of like-nanospheres with diameters about 200-300 nm and average crystallite size 95.60 nm, which showed relatively strong absorption in UV-visible spectral region. The proper dosage of the catalyst was 0.05 g and addition of H2O2 was helpful to the degradation of dye. Degradation rate of Rh B of 50 mL 20 mg/L could reach 99.2% with the synergistic action of NiFe2O4 0.05 g, 30% H2O2 0.4 mL and simulated sunlight irradiation 240 min. The degradation rate of Rh B solution was 85.2% under irradiation of actual sunlight for 240 min.