Influence of Natural Colloids on Am(III) Adsorption Onto Sediments During Batch and Stirred Flow-Through Experiments

IF 3 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Water, Air, & Soil Pollution Pub Date : 2025-02-25 DOI:10.1007/s11270-025-07812-7

Ke Chen, Jun Zhu, Qiulan Zhang, Jingli Shao, Yali Cui, Aiming Zhang, Song Yang, Kai Liu, Shouchuan Zhang, Liangjie Zhao

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引用次数: 0

Abstract

Exploring the kinetic adsorption and desorption of Americium (Am(III)) on sediments and natural colloids can effectively predict its solid–liquid distribution behavior in the environment. In this study, we used batch and stirred flow-through experiments to describe the kinetic adsorption and desorption process of Am(III) on Am(III)-sediments (AS) system and Am(III)-sediments-natural colloids (ASN) system under different conditions (such as solution pH, background electrolyte concentration, and solution injection velocity). The retention and desorption behavior of Am(III) was analyzed through adsorption distribution coefficients and breakthrough curves. The kinetic adsorption process was described using reaction and transport control models. The results showed that in the batch adsorption experiment, the presence of natural colloids significantly increased the adsorption distribution coefficient of the ASN system (249.11—2512.74 mL/g) compared to the AS system (233.05—447.29 mL/g). The retention of Am(III) in the stirred flow-through reactor in AS (70.26% - 73.64%) and ASN (74.13% - 76.25%) systems is relatively high under neutral and low flow rate conditions, which is attributed to the strong adsorption ability of dispersed and stable natural colloids and the sufficient adsorption time provided by low velocity. According to the fitted results of the models, it can be seen that physical reactions such as surface precipitation or surface complexation, as well as diffusion of the liquid surrounding the solid-phase adsorbent, dominate the kinetic adsorption process, which is time-dependent or non-equilibrium.

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间歇式和搅拌式流动实验中天然胶体对Am（III）在沉积物上吸附的影响

探索镅（Am(III)）在沉积物和天然胶体上的吸附和解吸动力学，可以有效预测其在环境中的固液分布行为。在本研究中，我们采用间歇式和搅拌式流动实验，描述了在不同条件（如溶液pH、本底电解质浓度和溶液注入速度）下，Am（III）在Am(III)-沉积物（AS）体系和Am(III)-沉积物-天然胶体（ASN）体系上的动力学吸附和解吸过程。通过吸附分布系数和突破曲线分析了Am（III）的保留和解吸行为。用反应和输运控制模型描述了吸附动力学过程。结果表明，在批量吸附实验中，天然胶体的存在显著提高了ASN体系（249.11-2512.74 mL/g）比AS体系（233.05-447.29 mL/g）的吸附分配系数。在中性和低流速条件下，AS（70.26% ~ 73.64%）和ASN（74.13% ~ 76.25%）体系中Am（III）在搅拌式反应器中的保留率较高，这是由于分散稳定的天然胶体具有较强的吸附能力，低速提供了充足的吸附时间。根据模型的拟合结果可以看出，吸附动力学过程主要是由表面沉淀或表面络合等物理反应以及固相吸附剂周围液体的扩散等物理反应主导，吸附动力学过程具有时间依赖性或非平衡性。

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

Water, Air, & Soil Pollution 环境科学-环境科学

CiteScore

4.50

自引率

6.90%

发文量

448

审稿时长

2.6 months

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. Articles should not be submitted that are of local interest only and do not advance international knowledge in environmental pollution and solutions to pollution. Articles that simply replicate known knowledge or techniques while researching a local pollution problem will normally be rejected without review. Submitted articles must have up-to-date references, employ the correct experimental replication and statistical analysis, where needed and contain a significant contribution to new knowledge. The publishing and editorial team sincerely appreciate your cooperation. Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.