Khataee Alireza, Karimi Atefeh, Arefi-Oskoui Samira, Darvishi Cheshmeh Soltani Reza, Hanifehpour Younes, Soltani Behzad, Joo Sang Woo
Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
Ultrason Sonochem. 2015 Jan;22:371-81. doi: 10.1016/j.ultsonch.2014.05.023. Epub 2014 Jun 3.
Undoped and Pr-doped ZnO nanoparticles were prepared using a simple sonochemical method, and their sonocatalytic activity was investigated toward degradation of Acid Red 17 (AR17) under ultrasonic (US) irradiation. Synthesized nanoparticles were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) techniques. The extent of sonocatalytic degradation was higher compared with sonolysis alone. The decolorization efficiency of sonolysis alone, sonocatalysis with undoped ZnO and 5% Pr-doped ZnO was 24%, 46% and 100% within reaction time of 70min, respectively. Sonocatalytic degradation of AR17 increased with increasing the amount of dopant and catalyst dosage and decreasing initial dye concentration. Natural pH was favored the sonocatalytic degradation of AR17. With the addition of chloride, carbonate and sulfate as radical scavengers, the decolorization efficiency was decreased from 100% to 65%, 71% and 89% at the reaction time of 70min, respectively, indicating that the controlling mechanism of sonochemical degradation of AR17 is the free radicals (not pyrolysis). The addition of peroxydisulfate and hydrogen peroxide as enhancer improved the degradation efficiency from 79% to 85% and 93% at the reaction time of 50min, respectively. The result showed good reusability of the synthesized sonocatalyst.
采用简单的声化学方法制备了未掺杂和掺镨的ZnO纳米颗粒，并研究了它们在超声（US）辐照下对酸性红17（AR17）降解的声催化活性。通过X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和X射线光电子能谱（XPS）技术对合成的纳米颗粒进行了表征。与单独的声解相比，声催化降解程度更高。在70分钟的反应时间内，单独声解、未掺杂ZnO和5%掺镨ZnO的声催化脱色效率分别为24%、46%和100%。AR17的声催化降解随着掺杂剂用量、催化剂用量的增加以及初始染料浓度的降低而增加。自然pH值有利于AR17的声催化降解。加入氯离子、碳酸根离子和硫酸根离子作为自由基清除剂后，在70分钟的反应时间内，脱色效率分别从100%降至65%、71%和89%，这表明AR17声化学降解的控制机制是自由基（而非热解）。加入过二硫酸盐和过氧化氢作为增强剂后，在50分钟的反应时间内，降解效率分别从79%提高到85%和93%。结果表明合成的声催化剂具有良好的可重复使用性。
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