Dandan Liu, Jianqiao Liu, Xiaoli Chen, YiJu Zhu, Yi Zhou, Jun Liu, Fangzhu Xiao, Guowen Peng
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引用次数: 0
摘要
放射性废液及其衍生物已逐渐成为对人类的潜在威胁。本研究以伊利石为基体，以硝酸铁为铁基供体源，用黄腐酸对吸附Eu（III）的材料进行改性，制备了fa - fe -伊利石。结果表明，fa - fe -伊利石对Eu（III）的吸附效率明显优于原料伊利石和铁柱负载伊利石（fe -伊利石）。当pH = 6，温度为298 K，时间为60 min，投加量为1.2 g/L时，铕的去除率和fa - fe -伊利石的去除率达到88.13%。吸附过程遵循准二级动力学模型和Langmuir等温线。此外，热力学参数还表明，吸附Eu（III）是一个熵递增的自发吸热过程。离子交换、静电吸附和表面官能团捕获（-COOH, -OH）在fa - fe -伊利石吸附Eu（III）中起重要作用。即使经过5次吸附-解吸循环，其去除率仍保持在75%。这些发现为放射性污染控制中Eu（III）的去除提供了新的思路。
Removal Performance and Mechanism of Eu (III) on Illite Supported by Hydroxyl Iron Pillars Modified with Fulvic Acid
Radioactive waste liquids and their derivatives have gradually become a potential threat to mankind. In this study, the FA-Fe-illite was prepared by using fulvic acid to modify the material for the adsorption of Eu(III) after with illite as the matrix and via ferric nitrate as the iron-based donor source. The results showed that the adsorption efficiency of FA-Fe-illite for Eu(III) was significantly better than that of raw illite and iron-column supported illite(Fe-illite). When the pH was 6 , the temperature was 298 K, the time was 60 minutes, and the dosage was 1.2 g/L, the removal rate of europium the removal rate of FA-Fe-illite reached 88.13%. The adsorption process followed the quasi-secondary kinetic model and Langmuir isotherm. Moreover, the thermodynamic parameters also indicated that the adsorption of Eu(III) was an entropy-increasing process with spontaneous heat absorption. Ion exchange, electrostatic adsorption, and surface functional group trapping (-COOH, -OH) played important roles in the adsorption of Eu(III) by FA-Fe-illite. Even after five adsorption-desorption cycles, the removal rate still maintained at 75%. These findings provide insights for the removal of Eu(III) in radioactive pollution control.
期刊介绍：
Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments.
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