Ionically cross-linked chitosan-oxalate/Al2O3 nanocomposite for highly efficient removal of eosin y dye: adsorption isotherm, kinetic, thermodynamic, and process optimization using BBD-RSM

IF 3.4 4区工程技术 Q2 POLYMER SCIENCE

Macromolecular Research Pub Date : 2025-05-07 DOI:10.1007/s13233-025-00403-9

Ahmed Saud Abdulhameed, Rima Heider Al Omari, Sultan Althahban, Yosef Jazaa, Mahmoud Abualhaija, Sameer Algburi

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Abstract

Herein, an ionically cross-linked chitosan-oxalate/Al₂O₃ (CHS-OXA/Al₂O₃) mesoporous nanocomposite was prepared by modifying the natural macromolecular biopolymer (chitosan, CHS) with a metal oxide nanomaterial (aluminum oxide, Al₂O₃ nanoparticles) and then using an ionic cross-linking method with oxalate (OXA). The physicochemical properties of CHS-OXA/Al₂O₃ have been comprehensively analyzed using methods like FTIR, XRD, BET, pH_pzc, and FESEM-EDX. Box–Behnken design (BBD) was adopted to analyze the efficacy of CHS-OXA/Al₂O₃ in eliminating eosin y (EOY) dye from an aqueous solution. The study included many aspects that influence the adsorption process, including the quantity of CHS-OXA/Al₂O₃ (ranging from 0.01 to 0.07 g), the duration of the process (10–40 min), and the pH level (ranging from 4 to 10). The highest EOY decolorization (98.4%) was attained at a pH of 4, a dosage of 0.053 g CHS-OXA/Al₂O₃, and a removal time of 39.6 min. The equilibrium behavior of EOY on CHS-OXA/Al₂O₃ matched well with the Freundlich isotherm. The kinetics data of EOY adsorption by CHS-OXA/Al₂O₃ were well characterized using a pseudo-first-order model. The computed enthalpy ΔH° was endothermic (13.04 kJ/mol), the entropy ΔS° was positive (0.066 kJ/molK), and Gibb's free energy ΔG° was negative (6.83–8.85 kJ/mol) according to the thermodynamic studies, confirming that the adsorption process is spontaneous. The CHS-OXA/Al₂O₃ material possesses an adsorption ability of 378.6 mg/g. This work showcases the outstanding capacity of CHS-OXA/Al₂O₃ as a very effective adsorbent for eliminating synthetic dyes from wastewater.

Graphical abstract

A chitosan-based nanocomposite of ionically crosslinked chitosan-oxalate/Al₂O₃ nanoparticles was synthesized. The chitosan-based nanocomposite exhibited high efficiency in removing eosin Y dye from water. Adsorption mechanisms included electrostatic attraction, hydrogen bonding, and n-π interactions

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离子交联壳聚糖-草酸盐/Al2O3纳米复合材料高效去除伊红y染料：吸附等温线、动力学、热力学和BBD-RSM工艺优化

本文采用金属氧化物纳米材料（氧化铝，Al2O3纳米颗粒）对天然高分子生物聚合物（壳聚糖，CHS）进行改性，再与草酸盐（OXA）进行离子交联，制备了离子交联壳聚糖-草酸盐/Al2O3 （CHS-OXA/Al2O3）介孔纳米复合材料。采用FTIR、XRD、BET、pHpzc、FESEM-EDX等方法对CHS-OXA/Al2O3的理化性质进行了综合分析。采用Box-Behnken设计（BBD）分析了CHS-OXA/Al2O3去除水溶液中伊红y （EOY）染料的效果。研究包括影响吸附过程的许多方面，包括CHS-OXA/Al2O3的量（范围从0.01到0.07 g），过程持续时间（10 - 40 min）和pH值（范围从4到10）。在pH = 4、CHS-OXA/Al2O3用量为0.053 g、去除时间为39.6 min的条件下，EOY脱色率最高（98.4%）。EOY在CHS-OXA/Al2O3上的平衡行为符合Freundlich等温线。用拟一阶模型对CHS-OXA/Al2O3吸附EOY的动力学数据进行了表征。热力学研究结果表明，吸附焓ΔH°为吸热焓（13.04 kJ/mol），熵ΔS°为正（0.066 kJ/mol），吉布自由能ΔG°为负（6.83 ~ 8.85 kJ/mol），表明吸附过程是自发的。CHS-OXA/Al2O3材料的吸附能力为378.6 mg/g。这项工作展示了CHS-OXA/Al2O3作为一种非常有效的吸附剂从废水中去除合成染料的杰出能力。合成了一种基于壳聚糖的离子交联草酸壳聚糖/氧化铝纳米复合材料。壳聚糖基纳米复合材料对水中的伊红Y染料具有较好的去除效果。吸附机制包括静电吸引、氢键和n-π相互作用

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来源期刊

Macromolecular Research 工程技术-高分子科学

CiteScore

4.70

自引率

8.30%

发文量

100

审稿时长

1.3 months

期刊介绍： Original research on all aspects of polymer science, engineering and technology, including nanotechnology Presents original research articles on all aspects of polymer science, engineering and technology Coverage extends to such topics as nanotechnology, biotechnology and information technology The English-language journal of the Polymer Society of Korea Macromolecular Research is a scientific journal published monthly by the Polymer Society of Korea. Macromolecular Research publishes original researches on all aspects of polymer science, engineering, and technology as well as new emerging technologies using polymeric materials including nanotechnology, biotechnology, and information technology in forms of Articles, Communications, Notes, Reviews, and Feature articles.