超声结合TiO2纳米颗粒对罗丹明B的降解效率  

The degradation efficiency of rhodamine B by the combination of ultrasound and TiO 2 nanoparticle

作　　者：郝长春[1] 宋寿健 张庆 张香港 孙润广[1] HAO Changchun;SONG Shoujian;ZHANG Qing;ZHANG Xianggang;SUN Runguang(School of Physics and Information Technology,Shaanxi Normal University,Xi′an 710119,Shaanxi,China)

机构地区：[1]陕西师范大学物理学与信息技术学院,陕西西安710119

出　　处：《陕西师范大学学报（自然科学版）》2020年第3期89-95,124,共8页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：国家自然科学基金(11874039)。

摘　　要：通过溶胶-凝胶法与热处理相结合合成了纳米TiO 2颗粒,利用能量色散X射线光谱(EDS)、X射线衍射(XRD)和扫描电子显微镜(SEM)对纳米固体颗粒进行了表征,研究了纳米颗粒与超声-机械搅拌相结合的方法对罗丹明B的降解效率。结果表明:纳米颗粒为反应提供了更多的空化气泡的成核位置,搅拌使降解过程更加剧烈,纳米颗粒与超声-机械搅拌均对降解效率有着显著影响。最终优化的反应条件:转速为500 r/min、频率为40 kHz、功率为300 W、pH值为7、罗丹明B的初始浓度为20 mg/L和TiO 2的添加量为500 mg/L。在最佳条件下,罗丹明B的最大降解率为98.6%。The TiO 2 nanoparticles were successfully synthesized through simple the combination of the sol-gel method and heat treatment.Nano-solid particles were verified by energy dispersive X-ray spectroscopy(EDS),X-ray diffractometry(XRD)and scanning electron microscopy(SEM).The degradation efficiency of rhodamine B was investigated by the combination of nano-solid particles and agitation under ultrasonic radiation.Then,the effects of different factors on the degradation efficiency of rhodamine B were studied in this reaction system.Moreover,the added air bubbles into the solution and physical adsorption of nano-solid particles which can affect the degradation efficiency were investigated.The results show that both nanoparticles and ultrasonic-mechanical stirring have significant effects on the degradation efficiency.Nano-solid particles provide more nucleation sites of cavitation bubbles for the reaction,agitation makes the degradation process more intense.The optimum reaction conditions were as follows:speed of 500 r/min,frequency of 40 kHz,power of 300 W,pH value of 7,initial concentration of rhodamine B of 20 mg/L and addition of titanium dioxide of 500 mg/L.Under optimum conditions,the most degradation rate of rhodamine B was 98.6%.

关 键 词：溶胶-凝胶法 超声催化降解 TIO 2纳米颗粒 罗丹明B 机械搅拌 

分 类 号：O426.4[理学—声学]