Cadmium removal using Rhassoul/alginate composite beads: isotherms, kinetics, and thermodynamic study

IF 3 4区工程技术 Q3 CHEMISTRY, PHYSICAL Adsorption Pub Date : 2024-12-25 DOI:10.1007/s10450-024-00583-3

Khadija Achchatar, Sabine Valange, Abdelhak Kherbeche, Hervé Gallard, Khalid Draoui

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Abstract

Cadmium is a threat to human health and the environment. Therefore, there is a need for efficient and sustainable adsorbents to remediate cadmium-contaminated water. This study explores the effectiveness of Rhassoul clay/alginate composite beads in adsorbing cadmium from aqueous solutions, a simple, efficient, and cost-effective water treatment method. Various physicochemical factors influencing the adsorption capacity of the Rhassoul/alginate hybrid composite beads were examined, including adsorbent dosage (0.5–4.0 g/L suspension), contact time (30–360 min), pH (2–7), initial Cd²⁺ concentration (20–200 mg/L), and temperature (25–40 °C). The results revealed an adsorption capacity of 20 mg/g for non-modified Rhassoul clay, while the Rhassoul/alginate composite beads exhibited a significantly higher maximum adsorption capacity of 105 mg/g. Thermodynamic parameters (∆G°, ∆H°, and ∆S°) indicated the process was spontaneous and endothermic.

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使用藻酸盐/海藻酸盐复合微珠去除镉：等温线，动力学和热力学研究

镉对人类健康和环境构成威胁。因此，需要高效和可持续的吸附剂来修复镉污染的水。本研究探讨了一种简单、高效、经济的水处理方法——海藻酸盐/粘土复合微球吸附水中镉的效果。考察了吸附量（0.5 ~ 4.0 g/L悬浮液）、接触时间（30 ~ 360 min）、pH（2 ~ 7）、初始Cd2+浓度（20 ~ 200 mg/L）、温度（25 ~ 40℃）等理化因素对藻酸盐/藻酸盐复合微球吸附性能的影响。结果表明，未改性的藻酸根粘土的吸附量为20 mg/g，而藻酸根/藻酸根复合微球的最大吸附量为105 mg/g。热力学参数（∆G°，∆H°和∆S°）表明该过程是自发的吸热过程。图形抽象

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来源期刊

Adsorption 工程技术-工程：化工

CiteScore

8.10

自引率

3.00%

发文量

审稿时长

2.4 months

期刊介绍： The journal Adsorption provides authoritative information on adsorption and allied fields to scientists, engineers, and technologists throughout the world. The information takes the form of peer-reviewed articles, R&D notes, topical review papers, tutorial papers, book reviews, meeting announcements, and news. Coverage includes fundamental and practical aspects of adsorption: mathematics, thermodynamics, chemistry, and physics, as well as processes, applications, models engineering, and equipment design. Among the topics are Adsorbents: new materials, new synthesis techniques, characterization of structure and properties, and applications; Equilibria: novel theories or semi-empirical models, experimental data, and new measurement methods; Kinetics: new models, experimental data, and measurement methods. Processes: chemical, biochemical, environmental, and other applications, purification or bulk separation, fixed bed or moving bed systems, simulations, experiments, and design procedures.