Sustainable kaolin-crosslinked kappa-carrageenan hydrogel as an efficient adsorbent for cationic dye removal from wastewater

IF 6.7 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-07-17 DOI:10.1016/j.jwpe.2025.108333

Fekri Abdulraqeb Ahmed Ali , Javed Alam , Ahmed S. Al-Fatesh , Farid Fadhillah , Badr M. Thamer , Muhammad Ali Shar , Mansour Alhoshan

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Abstract

Dissolution of biopolymers in water is indeed a challenge for water treatment applications. By developing strong 3D gels through ionic crosslinking, biopolymers can be effectively utilized for water treatment applications. In this study, a sustainable and cost-effective kaolin-crosslinked κ-carrageenan (Kln-crosslinked κCg) hydrogel was developed by crosslinking kaolin clay with the κ-carrageenan biopolymer to eliminate cationic dyes, crystal violet (CV) and methylene blue (MB), from wastewater. The developed hydrogels were characterized using XRD, FTIR, SEM, and BET techniques. The effects of dye concentration, adsorbent dosage, pH, and temperature on the adsorption process were assessed. The pseudo-second-order and Elovich models most accurately depicted the adsorption kinetics, implying that chemisorption was the predominant mechanism. The Langmuir isotherm effectively represented the experimental data, indicating monolayer adsorption with saturation capacities of 188.4 ± 5.07 mg/g for CV and 124 ± 2.21 mg/g for MB. Thermodynamic analysis showed an endothermic, spontaneous process, increasing system disorder. Additionally, the hydrogel showed high reusability, ∼70 % removal efficiency after three cycles. A multi-objective genetic algorithm II (MOGA-II) effectively optimized the adsorption parameters. The artificial neural network model, with 10 neurons, yielded good predictive results, aligning closely with experimental data. R² values were 0.9953 for CV and 0.9519 for MB.

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可持续高岭土交联卡帕-卡拉胶水凝胶对废水中阳离子染料的高效吸附剂

生物聚合物在水中的溶解确实是水处理应用中的一个挑战。通过离子交联形成强三维凝胶，生物聚合物可以有效地用于水处理应用。本研究通过高岭土与κ-卡拉胶生物聚合物的交联，制备了一种可持续、经济的高岭土交联κ-卡拉胶水凝胶（kln -交联κCg），以去除废水中的阳离子染料结晶紫（CV）和亚甲基蓝（MB）。采用XRD、FTIR、SEM、BET等技术对制备的水凝胶进行了表征。考察了染料浓度、吸附剂用量、pH和温度对吸附过程的影响。拟二阶模型和Elovich模型最准确地描述了吸附动力学，表明化学吸附是主要的吸附机理。Langmuir等温线有效地反映了实验数据，表明单层吸附的饱和容量为188.4±5.07 mg/g的CV和124±2.21 mg/g的MB。热力学分析表明，这是一个吸热自发过程，增加了系统的无序性。此外，水凝胶具有很高的可重复使用性，三次循环后的去除率为70%。多目标遗传算法（MOGA-II）有效地优化了吸附参数。具有10个神经元的人工神经网络模型产生了良好的预测结果，与实验数据非常吻合。CV和MB的R2分别为0.9953和0.9519。

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来源期刊

Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology

CiteScore

10.70

自引率

8.60%

发文量

846

审稿时长

24 days

期刊介绍： The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies