Akintayo Cecilia O, Aremu Omolola H, Igboama Wilfred N, Nelana Simphiwe M, Ayanda Olushola S
Nanoscience Research Unit, Department of Industrial Chemistry, Federal University Oye Ekiti, P.M.B 373, Oye Ekiti 362001, Nigeria.
Department of Physics, Federal University Oye Ekiti, P.M.B 373, Oye Ekiti 362001, Nigeria.
Materials (Basel). 2021 Sep 2;14(17):5012. doi: 10.3390/ma14175012.
In this study, the use of ultra-violet (UV) light with or without iron oxide nanoparticles (IONPs) for the degradation of synthetic petroleum wastewater was investigated. The IONPs was synthesised by sodium borohydride reduction of ferric chloride solution and was characterised by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectrometry (FTIR), x-ray fluorescence spectrophotometry (XRF), and energy dispersive spectroscopy (EDS). The amount of degradation was evaluated by chemical oxygen demand (COD) determination. Experimental results show that the COD removal from synthetic petroleum wastewater by IONPs/UV system was more effective than they were independently. The combination of UV light at a wavelength of 254 nm, pH of 8, and 1.0 g of IONPs resulted in COD removal from 10.5% up to 95.5%. The photocatalytic degradation of synthetic petroleum wastewater is about 1.3-2.0 times faster in comparison to UV light only. The removal of COD from synthetic petroleum wastewater by UV light and IONPs follows the pseudo-first-order kinetic model with rate constant ranging from 0.0133 min to 0.0269 min. Consequently, this study has shown that the use of UV light in the presence of IONPs is favourable and effective for the removal of organic pollutants from petroleum refinery wastewater.
在本研究中，研究了使用紫外线（UV）光以及添加或不添加氧化铁纳米颗粒（IONPs）对合成石油废水进行降解的情况。通过硼氢化钠还原氯化铁溶液合成了IONPs，并通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）、X射线荧光分光光度法（XRF）和能量色散光谱（EDS）对其进行了表征。通过化学需氧量（COD）测定来评估降解量。实验结果表明，IONPs/UV系统对合成石油废水的COD去除效果比单独使用UV光或IONPs更有效。波长为254nm的紫外光、pH值为8以及1.0g IONPs的组合使得COD去除率从10.5%提高到了95.5%。与仅使用紫外光相比，合成石油废水的光催化降解速度快约1.3 - 2.0倍。紫外光和IONPs对合成石油废水的COD去除遵循准一级动力学模型，速率常数范围为0.0133 min⁻¹至0.0269 min⁻¹。因此，本研究表明，在IONPs存在的情况下使用紫外光有利于且有效地去除炼油废水中的有机污染物。
