{"title":"From waste to resource: Production and characterization of eggshell adsorbent for glyphosate removal by adsorption","authors":"Mirian Cristina Enderle , Patricia Grzybowski , Magda Alana Pompelli Manica , Gabriel Tochetto , Gean Delise Leal Pasquali , Leandro Bassani , Aniela Pinto Kempka , Adriana Dervanoski , Cleuzir da Luz","doi":"10.1016/j.jwpe.2025.107464","DOIUrl":null,"url":null,"abstract":"<div><div>This study developed and characterized an adsorbent from egg processing waste from the agro-industry and applied it to remove glyphosate in aqueous solutions. Using a factorial design, optimal synthesis conditions were determined, with the waste being calcined at 883 °C for 43 min. The mesoporous adsorbent exhibited a surface area of 0.001 m<sup>2</sup> g<sup>−1</sup>, a pore volume of 0.002 cm<sup>3</sup> g<sup>−1</sup>, and an average pore diameter of 40 Å. Chemical characterization revealed a high calcium oxide content, while hydroxyl, amine, alcohol, and phenol functional groups were found on the surface. Equilibrium was achieved after 240 min, with the pseudo-second-order model best describing the experimental data. The isotherm models that fit the experimental data were the Sips model at 25–45 ± 2 °C. The highest adsorption capacity observed was 25.69 mg g<sup>−1</sup> (45 °C). Thermodynamic parameters indicated that the adsorption process was endothermic, spontaneous, and favorable for glyphosate. The adsorption mechanism occurred through ligand exchange and electromagnetic interaction, where the <img>OH anions of the adsorbent interacted with the phosphonate group in glyphosate.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"72 ","pages":"Article 107464"},"PeriodicalIF":6.7000,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of water process engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214714425005367","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/3/13 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
This study developed and characterized an adsorbent from egg processing waste from the agro-industry and applied it to remove glyphosate in aqueous solutions. Using a factorial design, optimal synthesis conditions were determined, with the waste being calcined at 883 °C for 43 min. The mesoporous adsorbent exhibited a surface area of 0.001 m2 g−1, a pore volume of 0.002 cm3 g−1, and an average pore diameter of 40 Å. Chemical characterization revealed a high calcium oxide content, while hydroxyl, amine, alcohol, and phenol functional groups were found on the surface. Equilibrium was achieved after 240 min, with the pseudo-second-order model best describing the experimental data. The isotherm models that fit the experimental data were the Sips model at 25–45 ± 2 °C. The highest adsorption capacity observed was 25.69 mg g−1 (45 °C). Thermodynamic parameters indicated that the adsorption process was endothermic, spontaneous, and favorable for glyphosate. The adsorption mechanism occurred through ligand exchange and electromagnetic interaction, where the OH anions of the adsorbent interacted with the phosphonate group in glyphosate.
期刊介绍：
The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies
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