Application of Anionic Hydrogels from Date Palm Waste for Dye Adsorption in Wastewater Treatment.

IF 5 3区 化学 Q1 POLYMER SCIENCE Gels Pub Date : 2024-09-26 DOI:10.3390/gels10100617
Farid Fadhillah, Abdulrahman G Alhamzani, Khaled Bin Bandar, Abdullah Alshamari, Saad Aljlil, Abdelrahman G Gadallah, M A Habib, Mortaga M Abou-Krisha, Mona A Abdel-Fatah
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Abstract

This work aimed to develop an anionic cellulose nanofiber (CNF) bio-adsorbent from date palm tree waste and to investigate its removal efficiency compared to cationic methylene blue dye from contaminated water. Date palm pulp was first prepared from date palm leaves through acid hydrolysis using H2SO4, followed by hydrolysis in a basic medium using KOH, in which the process completely removed the components of hemicellulose, lignin, and silica. To obtain anionic CNF, the resulting pulp was further treated with H2SO4, followed by centrifugation. Biogel formation of the CNF suspension was promoted by sonication, where its removal efficiency of methylene blue dye was studied as a function of dye concentration, temperature, contact time, and pH value. In this work, we investigated two isotherms, i.e., Langmuir and Freundlich. The Langmuir model's consistency with the experimental data suggests that the adsorption of methylene blue dye onto CNF is monolayer and surface-limited. The reported maximum removal efficiency of 5 mg/g at 60 °C indicates the optimal temperature for adsorption in this specific case. Additionally, a pseudo-second-order model and Elovich model were also utilized to obtain a better understanding of the adsorption mechanism, in which we found not just physical adsorption but also an indication of a chemical reaction occurring between methylene blue dye and CNF. According to the results, that pseudo-second-order model's consistency with the experimental data suggests that the adsorption of methylene blue (MB) onto CNF is rate-limiting step involving chemisorption between the two. The study reveals that CNF adsorbents derived from renewable natural waste sources such as date palm leaves can be effective in removing cationic contaminants such as methylene blue dye.

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从椰枣废料中提取的阴离子水凝胶在废水处理中的染料吸附应用。
本研究旨在从枣椰树废料中开发一种阴离子纤维素纳米纤维(CNF)生物吸附剂,并研究其与阳离子亚甲基蓝染料相比对污染水中染料的去除效率。首先用 H2SO4 酸水解枣椰树叶制备枣椰浆,然后用 KOH 在碱性介质中水解,在此过程中完全去除半纤维素、木质素和二氧化硅成分。为获得阴离子 CNF,产生的纸浆进一步用 H2SO4 处理,然后离心。通过超声促进 CNF 悬浮液形成生物凝胶,并研究了其去除亚甲基蓝染料的效率与染料浓度、温度、接触时间和 pH 值的函数关系。在这项工作中,我们研究了两种等温线,即 Langmuir 和 Freundlich。Langmuir 模型与实验数据一致,表明亚甲基蓝染料在 CNF 上的吸附是单层和表面受限的。据报告,在 60 °C 时的最大去除效率为 5 mg/g,这表明在这种特定情况下吸附温度是最佳的。此外,为了更好地理解吸附机理,我们还利用了伪二阶模型和埃洛维奇模型,发现其中不仅有物理吸附,还有亚甲基蓝染料与 CNF 之间发生化学反应的迹象。研究结果表明,伪二阶模型与实验数据的一致性表明,亚甲基蓝(MB)在 CNF 上的吸附是涉及二者之间化学吸附的限速步骤。研究结果表明,从枣椰叶等可再生天然废物中提取的 CNF 吸附剂可有效去除亚甲基蓝染料等阳离子污染物。
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来源期刊
Gels
Gels POLYMER SCIENCE-
CiteScore
4.70
自引率
19.60%
发文量
707
审稿时长
11 weeks
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