Study on the regularity of Se(IV) adsorption by bentonite from different regions

IF 0.4 4区工程技术 Q4 NUCLEAR SCIENCE & TECHNOLOGY

Kerntechnik Pub Date : 2023-08-02 DOI:10.1515/kern-2023-0025

Qifeng Jiang, Weigang Liu, Yuxin Liao, Haonan Li, Junhan Li, Jiahui Feng, Zimin Zhang, Yuzhen Sun, Yuxin Chen, Jiachen Guo, X. Su, R. Hua

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Abstract

Abstract Bentonite exhibits obvious geological characteristics in different areas, and its chemical composition varies. To investigate the impact of these variations on the adsorption of Se(IV), the chemical structures and elemental contents of three types of bentonites were characterized using FTIR and XR. By conducting a series of experiments and fitting the results with the kinetic adsorption model and the isothermal adsorption model, it was discovered that bentonite exhibits diverse adsorption modes for Se(IV). In acidic environments, the adsorption mode primarily involves forming an outer-sphere complex, whereas in neutral and alkaline environments, the primary mode is to form an inner-sphere complex. Zhi-Shin bentonite, which has low alumina content and high iron oxide content, demonstrates poor adsorption effectiveness on Se(IV) at low temperatures (less than 45 °C), but exhibits good adsorption effectiveness at high temperatures (more than 50 °C). Conversely, bentonite with high alumina content and low iron oxide content demonstrates the opposite effect. Furthermore, for bentonite with high iron oxide content, Se(IV) will form more inner-sphere complexes with iron oxide, and the adsorption behavior is not easily affected by changes in ionic strength and pH.

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不同地区膨润土对Se(IV)的吸附规律研究

膨润土在不同地区具有明显的地质特征，其化学成分也各不相同。为了研究这些变化对Se(IV)吸附的影响，利用FTIR和XR对三种膨润土的化学结构和元素含量进行了表征。通过一系列实验，并与动力学吸附模型和等温吸附模型拟合，发现膨润土对Se(IV)具有多种吸附模式。在酸性环境中，吸附模式主要是形成外球配合物，而在中性和碱性环境中，主要是形成内球配合物。直新膨润土氧化铝含量低，氧化铁含量高，在低温(小于45 °C)下对Se(IV)的吸附效果较差，在高温(大于50 °C)下吸附效果较好。相反，高氧化铝含量和低氧化铁含量的膨润土表现出相反的效果。此外，对于氧化铁含量高的膨润土，Se(IV)会与氧化铁形成更多的球内配合物，并且吸附行为不易受离子强度和pH变化的影响。

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

Kerntechnik 工程技术-核科学技术

CiteScore

0.90

自引率

20.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Kerntechnik is an independent journal for nuclear engineering (including design, operation, safety and economics of nuclear power stations, research reactors and simulators), energy systems, radiation (ionizing radiation in industry, medicine and research) and radiological protection (biological effects of ionizing radiation, the system of protection for occupational, medical and public exposures, the assessment of doses, operational protection and safety programs, management of radioactive wastes, decommissioning and regulatory requirements).