Chitosan aerogel beads production by supercritical gel drying, and their application to methylene blue adsorption

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2025-07-28 DOI:10.1016/j.supflu.2025.106731

Alessandra Zanotti, Lucia Baldino, Giuseppina Iervolino, Stefano Cardea, Ernesto Reverchon

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Abstract

Water contamination from synthetic dyes is an urgent issue often addressed by means of adsorption, which is an easy, cost-effective, and flexible unit operation employed for contaminants removal. In this work, chitosan-based highly porous adsorbents were produced through supercritical drying, featuring a regular, nanostructured, and fiber-like morphology. Methylene blue withdrawal was assessed, exploring the effect of pH, temperature, and adsorbent dosage. The optimal operating conditions were at pH= 8 and T = 25 °C, resulting in an estimated saturation capacity of 196.538 mg/g. Adopting the multi-step strategy, it was possible to reach a value of adsorption efficiency of 88.0 ± 1.1 %. Lastly, chitosan aerogels are recyclable: they retain 88.0 ± 3.2 % of the initial adsorption capacity after five adsorption cycles. Kinetic analysis proved that most of dye withdrawal takes place in the first 10 min, accessing a fast and effective process. Overall, this research aims at proving the effectiveness of nanostructured devices for water remediation, moving a step further the full exploitation of aerogels into industrial scenarios.

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超临界凝胶干燥法制备壳聚糖气凝胶微珠及其在亚甲基蓝吸附中的应用

合成染料的水污染是一个迫切的问题，通常通过吸附来解决，吸附是一种简单、经济、灵活的单元操作，用于去除污染物。在这项工作中，壳聚糖基高多孔吸附剂通过超临界干燥制备，具有规则，纳米结构和纤维状的形态。考察了pH、温度和吸附剂用量对亚甲基蓝提取效果的影响。最佳操作条件为pH= 8,T = = 25℃，估计饱和容量为196.538 mg/g。采用多步吸附策略，吸附效率可达88.0 ± 1.1 %。最后，壳聚糖气凝胶是可回收的：经过5次吸附循环后，其吸附容量仍保持在初始吸附容量的88.0 ± 3.2 %。动力学分析证明，大多数染料的提取发生在前10 min，进入一个快速有效的过程。总的来说，本研究旨在证明纳米结构设备用于水修复的有效性，进一步将气凝胶的充分利用推向工业场景。

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来源期刊

Journal of Supercritical Fluids 工程技术-工程：化工

CiteScore

7.60

自引率

10.30%

发文量

236

审稿时长

56 days

期刊介绍： The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.