The performance of iron-silicate-based biochar as a sorbent material towards 133Ba retention from radioactive liquid waste

IF 1.4 3区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR
Sara S. Mahrous, Muhammad S. Mansy, Maha A. Youssef
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Abstract

The application of Phalaris seed peel (PSP) for the production of biochar involves the pyrolysis process in an N2 environment, resulting in the creation of a cost-effective sorbent. Two distinct modifications were conducted on the existing biochar (BC), employing just silicate (BC/SiO2) and in combination with iron-silicate (BC/SiO2/Fe). Several analytical methods were used to look at the modified biochar’s physical and chemical properties. These included scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis-differential thermal analysis (TGA-DTA), and surface area analysis. Based on the initial investigations, it has been revealed that the use of silica and iron as the second modification is a more suitable approach for effectively retaining 133Ba from liquid radioactive waste streams. The investigation of sorption kinetics and isotherms was conducted to enhance our understanding of the process. The Langmuir isotherm model demonstrates the most optimal correlation for sorption, yielding a maximum sorption capacity (Q max) of 31 mg/g. Furthermore, an evaluation was performed on the BC/SiO2/Fe sorbent material by subjecting it to a mixture of simulated radioactive liquid waste, which included 133Ba, 60Co, and 137Cs.The experimental results indicate that BC/SiO2/Fe exhibits a comparatively higher sorption capacity for 133Ba when compared to 60Co and 137Cs as competing ions.
硅酸铁基生物炭作为吸附材料从放射性液体废物中截留 133Ba 的性能
应用法桐种子皮(PSP)生产生物炭涉及在氮气环境中的热解过程,从而产生一种具有成本效益的吸附剂。对现有的生物炭(BC)进行了两种不同的改良,一种是只使用硅酸盐(BC/SiO2),另一种是结合使用硅酸铁(BC/SiO2/Fe)。我们使用了几种分析方法来研究改性生物炭的物理和化学特性。这些方法包括扫描电子显微镜 (SEM)、能量色散 X 射线光谱 (EDX)、X 射线衍射 (XRD)、傅立叶变换红外光谱 (FTIR)、热重分析-差热分析 (TGA-DTA) 和表面积分析。初步研究表明,使用二氧化硅和铁作为第二种改性剂是一种更适合从液态放射性废物流中有效截留 133Ba 的方法。为了加深对这一过程的理解,我们对吸附动力学和等温线进行了研究。朗缪尔等温线模型显示了最理想的吸附相关性,得出的最大吸附容量(Q max)为 31 毫克/克。实验结果表明,与作为竞争离子的 60Co 和 137Cs 相比,BC/SiO2/Fe 对 133Ba 的吸附能力相对较高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Radiochimica Acta
Radiochimica Acta 化学-核科学技术
CiteScore
2.90
自引率
16.70%
发文量
78
审稿时长
6 months
期刊介绍: Radiochimica Acta publishes manuscripts encompassing chemical aspects of nuclear science and technology.
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