纳米Ni/Fe双金属催化降解盐酸环丙沙星的研究

Study on Degradation of Ciprofloxacin by Nanoscale Ni/Fe Particle

用液相还原法制备纳米Ni/Fe双金属,通过比表面分析仪(BET)、X射线衍射分析仪(XRD)、透射电镜(TEM)对其进行了表征.研究结果表明,制备的纳米金属颗粒直径在10～20 nm,比表面积为68 m2/g.纳米Ni/Fe投加量为0.43 g/L,盐酸环丙沙星的初始质量浓度为30 mg/L,初始pH为7的降解效果最好,催化反应60 min后,降解率达83.3%.在最佳反应条件下,纳米Ni/Fe、纳米零价铁和商业铁粉的降解效率顺序为:纳米Ni/Fe双金属>纳米零价铁>商业铁粉.纳米Ni/Fe双金属对盐酸环丙沙星的降解反应近似符合一级动力学方程.

The nano -Ni/Fe particle was prepared by a liquid- reduction process and was characterized by BET, XRD and TEM. Results showed that the diameter of the particles was between 10 - 20 nm, the specific surface area of nanoscale Ni/Fe was 68 m2/g. The effects of degradation of CPFX were studied, The degrada nano -Ni/Fe dosage, initial concentration, initial pH and time on tion of CPFX between nano - Ni/Fe, nano - Fe0 and Fe0 was also compared. The results indicated that after 60min, the degradation ratio of CPFX reached 83.3% under the condi- tions of nano - Ni/Fe dosage at 0. 43 g/L, CPFX concentration at 30 mg/L and initial pH value at 7. At the opti- mized conditions, the order of degradation ratio between nano - Ni/Fe, nano - Fe0 and Fe0 is ： nano - Ni/Fe 〉 nano -Fe0 〉 Fe0. Kinetics study showed that the degradation of CPFX by nano - Ni/Fe could be approximately de- scribed with the pseudo -first -order kinetic model.