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Implementation of continuously electro-generated Fe3O4 nanoparticles for activation of persulfate to decompose amoxicillin antibiotic in aquatic media: UV254 and ultrasound intensification
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2018-07-23 , DOI: 10.1016/j.jenvman.2018.07.072
Fatemeh Sepyani , Reza Darvishi Cheshmeh Soltani , Sahand Jorfi , Hatam Godini , Mahdi Safari

In the present investigation, the treatment of amoxicillin (AMX)-polluted water by the activated persulfate (PS) was considered. As a novel research, continuously electro-generated magnetite (Fe3O4) nanoparticles (CEMNPs) were utilized as the activator of PS in an electrochemical medium. The PS/CEMNPs displayed a remarkable enhancement in the decomposition of AMX molecules up to 72.6% compared with lonely PS (24.8%) and CEMNPs (13.4%). On the basis of pseudo-first order reaction rate constants, the synergy percent of about 70% was achieved due to the combination of PS with CEMNPs. The adverse influence of free radical-scavenging compounds on the efficiency of the PS/CEMNPs process was in the following order: carbonate < chloride < tert-butyl alcohol < ethanol. Overall, these results proved the main role of free radical species in degrading AMX. The implementation of ultrasound (US) enhanced the performance of the PS/CEMNPs process. Nevertheless, the highest degradation efficiency of about 94% was achieved when UV254 lamp was joined the PS/CEMNPs system. Under UV254 and US irradiation, the results showed significant potential of the PS/CEMNPs process for degrading AMX antibiotic and generating low toxic effluent based on the activated sludge inhibition test. However, more time is needed to achieve the acceptable mineralization.



中文翻译:

实现连续电生成的Fe 3 O 4纳米粒子活化过硫酸盐以分解水介质中的阿莫西林抗生素:UV 254和超声增强

在本研究中,考虑了用活性过硫酸盐(PS)处理阿莫西林(AMX)污染的水。作为一项新的研究,连续电磁铁矿(Fe 3 O 4)纳米粒子(CEMNPs)被用作电化学介质中PS的活化剂。与孤独的PS(24.8%)和CEMNPs(13.4%)相比,PS / CEMNPs在AMX分子的分解中显示出显着增强,高达72.6%。在伪一级反应速率常数的基础上,由于PS与CEMNP的结合,获得了约70%的协同百分比。的自由基清除化合物上的PS / CEMNPs过程的效率的不利影响是按以下顺序:碳酸<氯化物< 丁醇<乙醇。总体而言,这些结果证明了自由基在降解AMX中的主要作用。超声(美国)的实施增强了PS / CEMNPs工艺的性能。但是,当将UV 254灯加入PS / CEMNPs系统时,可获得约94%的最高降解效率。根据活性污泥抑制试验,在UV 254和US辐射下,结果表明PS / CEMNPs工艺具有降解AMX抗生素和产生低毒废水的巨大潜力。但是,需要更多时间才能达到可接受的矿化程度。

更新日期:2018-07-23
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