Selective adsorption of cationic dye by κ-carrageenan-potato starch bio-hydrogel: Kinetics, isotherm, and thermodynamic studies

IF 7.7 1区化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY

International Journal of Biological Macromolecules Pub Date : 2024-10-09 DOI:10.1016/j.ijbiomac.2024.136377

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Abstract

An eco-friendly κ-carrageenan/potato starch bio-hydrogel is designed for the efficient removal of methylene blue (MB) dye from water. The incorporation of potato starch was successfully confirmed through XRD, FT-IR, and SEM analysis, while TGA highlighted the hydrogel's thermal stability. Batch adsorption experiments demonstrated excellent MB removal efficiency, with a maximum adsorption capacity of 116.1 mg/g under optimal conditions (initial dye concentration: 100 mg/L, contact time: 180 min, temperature: 20 °C, adsorbent dosage: 1.6 g/L, and pH: 11). FT-IR analysis indicated that electrostatic interactions and hydrogen bonding primarily govern the adsorption process. The adsorption followed pseudo-second-order kinetics and fitted well with the Langmuir isotherm model. Thermodynamic studies revealed that the adsorption was exothermic and spontaneous. A key feature of this bio hydrogel is its selective affinity for the cationic dye MB, in a mixture with Acid Orange (AO) and other cationic dyes (Rhodamine B (Rh B) and crystal violet (CV)). The adsorbent also demonstrated impressive reusability, maintaining 93 % of its efficiency after five cycles, highlighting its potential for sustainable and cost-effective water treatment.

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κ-卡拉胶-马铃薯淀粉生物水凝胶对阳离子染料的选择性吸附：动力学、等温线和热力学研究。

设计了一种环保型κ-卡拉胶/马铃薯淀粉生物水凝胶，用于高效去除水中的亚甲基蓝（MB）染料。通过 XRD、FT-IR 和 SEM 分析，成功确认了马铃薯淀粉的加入，而 TGA 则突出了水凝胶的热稳定性。批量吸附实验表明，水凝胶具有出色的甲基溴去除效率，在最佳条件下（初始染料浓度：100 毫克/升，接触时间：180 分钟），最大吸附容量为 116.1 毫克/克：初始染料浓度：100 毫克/升，接触时间：180 分钟，温度：20 °C，吸附剂用量：1.6 克/升，pH 值：0.5：1.6 克/升，pH 值：11）。傅立叶变换红外分析表明，吸附过程主要受静电作用和氢键作用的影响。吸附过程遵循伪二阶动力学，与 Langmuir 等温线模型非常吻合。热力学研究表明，吸附是放热和自发的。这种生物水凝胶的一个主要特点是它对与酸性橙（AO）和其他阳离子染料（罗丹明 B（Rh B）和水晶紫（CV））混合的阳离子染料 MB 具有选择性亲和力。这种吸附剂还表现出令人印象深刻的可重复使用性，在循环使用五次后仍能保持 93% 的效率，突出了其在可持续和具有成本效益的水处理方面的潜力。

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来源期刊

International Journal of Biological Macromolecules 生物-生化与分子生物学

CiteScore

13.70

自引率

9.80%

发文量

2728

审稿时长

64 days

期刊介绍： The International Journal of Biological Macromolecules is a well-established international journal dedicated to research on the chemical and biological aspects of natural macromolecules. Focusing on proteins, macromolecular carbohydrates, glycoproteins, proteoglycans, lignins, biological poly-acids, and nucleic acids, the journal presents the latest findings in molecular structure, properties, biological activities, interactions, modifications, and functional properties. Papers must offer new and novel insights, encompassing related model systems, structural conformational studies, theoretical developments, and analytical techniques. Each paper is required to primarily focus on at least one named biological macromolecule, reflected in the title, abstract, and text.