A low-cost water hyacinth-based adsorbent for free fatty acids removal from waste cooking oil: kinetic, isotherm, and thermodynamic studies

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-03-25 DOI:10.1007/s43153-024-00449-9

Amnat Phetrungnapha, Nalinnipa Wiengnak, Kamol Maikrang

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Abstract

The pre-treatment of waste cooking oil (WCO) by removing free fatty acids (FFAs) is pivotal for biodiesel production. This study develops a low-cost, efficient adsorbent derived from water hyacinth (Eichhornia crassipes), activated with 5 M NaOH, termed WHA-H, for this purpose. Characterization through FT-IR and SEM analyses revealed that NaOH activation significantly enhanced the surface roughness and functional group availability on WHA-H, leading to improved adsorption capabilities. Nitrogen adsorption–desorption isotherms of WHA-H confirmed a complex pore structure with Type II and Type IV isotherms combination, indicating the presence of both meso- and macroporosity. Kinetic studies conformed to the pseudo-second-order model, suggesting chemisorption as the primary FFA adsorption mechanism, while isotherm data were best described by the Langmuir model, indicating monolayer coverage on a homogeneous surface. WHA-H exhibited a maximum FFA adsorption capacity (q_m) of 1666.67 mg g⁻¹. Thermodynamic parameters indicated that the adsorption process is spontaneous and exothermic, with desorption studies establishing diethyl ether as an effective solvent for WHA-H regeneration. Our study not only demonstrates WHA-H’s potential as a sustainable adsorbent for improving WCO quality but also offers an eco-friendly approach to managing the invasive water hyacinth.

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一种用于去除废弃食用油中游离脂肪酸的低成本水葫芦基吸附剂：动力学、等温线和热力学研究

通过去除游离脂肪酸（FFAs）对废弃食用油（WCO）进行预处理是生产生物柴油的关键。本研究为此开发了一种从布袋莲（Eichhornia crassipes）中提取的低成本高效吸附剂，并用 5 M NaOH 进行活化，称为 WHA-H。通过傅立叶变换红外光谱（FT-IR）和扫描电子显微镜（SEM）分析表明，NaOH 活化显著提高了 WHA-H 的表面粗糙度和官能团可用性，从而提高了吸附能力。WHA-H的氮吸附-解吸等温线证实其孔隙结构复杂，具有II型和IV型等温线组合，表明存在中孔和大孔。动力学研究符合伪二阶模型，表明化学吸附是FFA的主要吸附机制，而等温线数据则用Langmuir模型进行了最佳描述，表明在一个均匀的表面上存在单层覆盖。WHA-H 的最大 FFA 吸附容量（qm）为 1666.67 mg g-1。热力学参数表明，吸附过程是自发和放热的，解吸研究证实二乙醚是 WHA-H 再生的有效溶剂。我们的研究不仅证明了 WHA-H 作为一种可持续吸附剂在改善 WCO 质量方面的潜力，还为管理入侵性水葫芦提供了一种生态友好型方法。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.