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Enhanced photodegradation of acid orange 61 by the novel hetero-junction CoFe2O4/AgCl
Optical Materials ( IF 3.9 ) Pub Date : 2021-09-14 , DOI: 10.1016/j.optmat.2021.111576
Billal Brahimi 1 , Elhadj Mekatel 1 , Mounir Mellal 1 , Oussama Baaloudj 2 , Razika Brahimi 3 , Asma Hemmi 1 , Mohamed Trari 3 , Mohamed Belmedani 1
Affiliation  

The objective of this study is to enhance the elimination of the textile dye Acid Orange (AO61) using the novel hetero-junction (CoFe2O4/AgCl), which was synthesized by the nitrate route at a different mass ratio. Before starting the photodegradation study, it is important to characterize the semiconductor. For that, the phase of the nanoparticles was identified by X-ray diffraction (XRD), and the morphology was investigated by scanning electron micrograph (SEM-EDS). The optical proprieties were analyzed using UV-VIS diffusion reflectance spectroscopy (DRS), an optical bandgap of 1.46 eV was found. For the electrochemical characterization, it was applied to determine the type of semiconductor as well as establish the energy diagram, a flat band of 0.3 VSCE corresponded to an p-type semiconductor has been determined. For the photodegradation of the orange acid dye, some operating parameters such as the mass ratio of CoFe2O4/AgCl, the catalyst dose, the pH of the solution and initial AO61 concentration were optimized. 25%/75% mass ratio of CoFe2O4/AgCl, catalyst dose of 1.25 g/L, pH ∼6 and 10 mg/L initial concentration were found as optimal conditions for the degradation performance under visible light with an efficiency of 98% within only 90 min. Different models were used to model the AO61 photodegradation, the kinetics were found in compliance with Hinshelwood Langmuir. Also, the photodegradation was tested under different sources of irradiation, a complete photodegradation was obtained for high concentration OA61 solution (50 mg/L) under solar irradiation within 90 min, which is much faster compared to other irradiation sources. In the final step, the mechanism of the AO61 photodegradation was studied and O2•- was found to be the main active radicals in the photocatalytic process.



中文翻译:

新型异质结 CoFe2O4/AgCl 增强光降解酸性橙 61

本研究的目的是使用新型异质结 (CoFe 2 O 4 /AgCl)来增强纺织染料酸性橙 (AO61) 的消除,该异质结是通过硝酸盐途径以不同质量比合成的。在开始光降解研究之前,对半导体进行表征很重要。为此,通过 X 射线衍射 (XRD) 鉴定纳米颗粒的相,并通过扫描电子显微照片 (SEM-EDS) 研究形貌。使用 UV-VIS 扩散反射光谱 (DRS) 分析光学特性,发现光学带隙为 1.46 eV。对于电化学表征,它用于确定半导体的类型以及建立能量图,0.3 V SCE的平坦带对应于p型半导体已确定。针对橙色酸性染料的光降解,优化了CoFe 2 O 4 /AgCl质量比、催化剂用量、溶液pH值和AO61初始浓度等操作参数。25%/75% CoFe 2 O 4质量比/AgCl、催化剂剂量为 1.25 g/L、pH ~6 和 10 mg/L 初始浓度被认为是可见光下降解性能的最佳条件,仅在 90 分钟内降解效率为 98%。使用不同的模型来模拟 AO61 光降解,发现动力学符合 Hinshelwood Langmuir。此外,在不同照射源下测试了光降解,高浓度OA61溶液(50mg / L)在太阳照射下在90分钟内获得了完全的光降解,与其他照射源相比要快得多。在最后一步,研究了AO61 光降解的机理,发现O 2 •-是光催化过程中的主要活性自由基。

更新日期:2021-09-15
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