Valorization of grape seed residues post-oil extraction as an adsorbent for hexavalent chromium in water. Kinetics, isotherms, thermodynamics, and techno-economic analysis

IF 8 Q1 ENERGY & FUELS

Energy nexus Pub Date : 2025-04-24 DOI:10.1016/j.nexus.2025.100437

Elvis G. Gonzales-Condori , Dalescka G. Bejar-Aramburu , Joan A. Gutierrez-Delgado , José A. Villanueva-Salas , Jonathan Gonzales-Condori , Betty M. Salazar-Pinto

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引用次数: 0

Abstract

The objective of the present research was to valorize grape seed residues post-oil extraction (GSR-POE) obtained by pressing as a potential adsorbent of Cr (VI) from simulated aqueous solutions. For this, we first compared the removal of Cr (VI) by grape seeds (GS) and GSR-POE, obtaining that GSR-POE achieves higher removal efficiency than GS. Subsequently, it was determined that, with a particle size of 75 μm of GSR-POE and pH=2, the adsorption efficiency of Cr (VI) was favored, achieving the removal of 68.76 % of a simulated aqueous solution of Cr (VI) of 100 mg/L with a GSR-POE dosage of 0.8 g/L. The kinetic study showed that the GSR-POE adsorption process best fitted the pseudo-second order model, likewise, the Langmuir isotherm best described the process resulting in a maximum adsorption capacity of 169.48 mg/g. The thermodynamic study showed that the process is endothermic and spontaneous. The mechanisms involved in the adsorption process would be chemisorption and electrostatic attraction as there is a higher adsorption at pH=2 which is lower than the point of zero charge of GSR-POE (pH_PZC= 4.95). Finally, a techno-economic analysis confirmed the economic viability and profitability of implementing a plant for GSR-POE production. In conclusion, under the conditions of this study, GSR-POE is a cost-effective and efficient adsorbent for Cr (VI) adsorption.

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葡萄籽残油萃取后作为水中六价铬吸附剂的增值研究。动力学，等温线，热力学和技术经济分析

本研究的目的是评估葡萄籽榨油后残留物（GSR-POE）作为模拟水溶液中Cr （VI）的潜在吸附剂。为此，我们首先比较了葡萄籽（GS）和GSR-POE对Cr （VI）的去除效果，发现GSR-POE对Cr （VI）的去除效果优于GS。结果表明，当GSR-POE粒径为75 μm、pH=2时，对Cr （VI）的吸附效率较高，在GSR-POE用量为0.8 g/L、Cr （VI）浓度为100 mg/L的模拟水溶液中，对Cr （VI）的去除率达到68.76%。动力学研究表明，GSR-POE吸附过程最符合拟二级模型，Langmuir等温线最能描述该过程，最大吸附量为169.48 mg/g。热力学研究表明，该过程是吸热自发的。吸附机理为化学吸附和静电吸引，pH=2时吸附量较高，低于GSR-POE的零电荷点（pHPZC= 4.95）。最后，技术经济分析证实了实施GSR-POE生产工厂的经济可行性和盈利能力。综上所述，在本研究条件下，GSR-POE是一种经济高效的吸附Cr （VI）吸附剂。

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来源期刊

Energy nexus Energy (General), Ecological Modelling, Renewable Energy, Sustainability and the Environment, Water Science and Technology, Agricultural and Biological Sciences (General)

CiteScore

7.70

自引率

0.00%

发文量

审稿时长

109 days