Valorization of Pineapple Leaf Waste for Methylene Blue Adsorption: A Comparative Study of Natural and Modified Adsorbents

IF 4.3 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

ACS Omega Pub Date : 2025-10-08 DOI:10.1021/acsomega.5c06723

Chayanit Rungrattanachai, , , Taweechai Amornsakchai, , and , Pornsawan Amornsakchai*,

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引用次数: 0

Abstract

Synthetic dyes like methylene blue (MB) are widely used in textiles and pharmaceuticals but pose environmental risks when discharged into wastewater. This study evaluates pineapple leaf biomass as a low-cost, biodegradable adsorbent for MB removal. Four materials─raw fiber (PALF), nonfibrous material (NFM), alkali-treated microfibers (PALMF), and ultrasonically treated PALMF (Ultra_PALMF)─were prepared and characterized. PALF achieved the highest adsorption capacity (53.93 mg g^–1), while NFM showed excellent reusability, retaining >96% efficiency after three cycles. Nonlinear kinetic analysis indicated that adsorption generally followed the pseudo-second-order model, though PALF was better described by the pseudo-first-order model. Equilibrium data were best represented by the Sips model, confirming the heterogeneous nature of the adsorption sites. Thermodynamic analysis confirmed a spontaneous, exothermic process. These findings highlight pineapple leaf waste as a sustainable alternative for dye removal, with NFM offering strong potential for practical reuse.

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菠萝叶废弃物对亚甲基蓝吸附的增值作用：天然和改性吸附剂的比较研究

亚甲基蓝（MB）等合成染料广泛用于纺织品和制药，但排放到废水中会造成环境风险。本研究评价菠萝叶生物量作为一种低成本、可生物降解的MB去除吸附剂。制备了原料纤维（PALF）、非纤维材料（NFM）、碱处理的微纤维（PALMF）和超声处理的微纤维（Ultra_PALMF）四种材料，并对其进行了表征。PALF的吸附量最高（53.93 mg g-1），而NFM的可重复使用性较好，经过3次循环后仍保持96%的效率。非线性动力学分析表明，吸附过程一般遵循伪二阶模型，而PALF更适合用伪一阶模型来描述。Sips模型最能代表平衡数据，证实了吸附位点的非均相性质。热力学分析证实了一个自发的放热过程。这些发现突出了菠萝叶废料作为染料去除的可持续替代品，NFM提供了强大的实际再利用潜力。

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来源期刊

ACS Omega Chemical Engineering-General Chemical Engineering

CiteScore

6.60

自引率

4.90%

发文量

3945

审稿时长

2.4 months

期刊介绍： ACS Omega is an open-access global publication for scientific articles that describe new findings in chemistry and interfacing areas of science, without any perceived evaluation of immediate impact.