Removal of methylene blue by hydrochar modified from hydrothermal carbonization technique

IF 2.1 4区环境科学与生态学 Q3 ENGINEERING, CHEMICAL

Environmental Progress & Sustainable Energy Pub Date : 2024-09-11 DOI:10.1002/ep.14469

Mohammad W. Amer, Eman M. Khdeir, Francesco Barzagli, Mustafa A. Taha, Heba M. Alsalti, Elias N. Ibrahim, Rahaf A. Almassi, Ahmad R. Hasoneh, Mohammed Y. Rasheed, Raid Al-Jawasrah

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引用次数: 0

Abstract

This study explores the adsorption potential of hydrothermally treated waste derived algal biomass for removing methylene blue (MB) dye. Synthesizing a modified hydrochar through hydrothermal carbonization (150°C, 35 bar) followed by NaOH modification, we observed enhanced thermal stability and distinctive chemical changes. Optimal conditions were determined at pH 6 and 1 h contact time. Soluble salts with cations were identified as impacting adsorption efficiency, with increased interference for higher cation charges. Thermodynamic parameters (ΔG, ΔH, and ΔS) indicated a spontaneous and exothermic process, the calculated values (−5.417 to −6.907 kJ mol⁻¹, −29.0 kJ mol⁻¹, −73.8 J K⁻¹ mol⁻¹) aligned with this behavior. Adsorption isotherms favored the Freundlich model, revealing heterogeneous multilayer adsorption, with a maximum capacity of 97%. Kinetic studies supported the pseudo-first-order model. This detailed exploration provides insights into thermodynamics, kinetics, and the impact of adsorption parameters on MB removal, emphasizing the practicality of alkaline-modified hydrochar as an effective, sustainable adsorbent.

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利用热液碳化技术改性的水炭去除亚甲基蓝

本研究探讨了经水热处理的废物衍生藻类生物质去除亚甲基蓝（MB）染料的吸附潜力。通过水热碳化（150°C，35 巴）合成改性水炭，然后进行 NaOH 改性，我们观察到其热稳定性增强，化学变化明显。最佳条件是 pH 值为 6，接触时间为 1 小时。结果表明，带有阳离子的可溶性盐会影响吸附效率，阳离子电荷越高，干扰越大。热力学参数（ΔG、ΔH 和 ΔS）表明这是一个自发的放热过程，计算值（-5.417 至 -6.907 kJ mol-1、-29.0 kJ mol-1、-73.8 J K-1 mol-1）与这一行为一致。吸附等温线倾向于 Freundlich 模型，显示了异质多层吸附，最大吸附容量为 97%。动力学研究支持伪一阶模型。这项详细的研究深入探讨了热力学、动力学以及吸附参数对甲基溴去除的影响，强调了碱改性水炭作为一种有效、可持续吸附剂的实用性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental Progress & Sustainable Energy 环境科学-工程：化工

CiteScore

5.00

自引率

3.60%

发文量

231

审稿时长

4.3 months

期刊介绍： Environmental Progress , a quarterly publication of the American Institute of Chemical Engineers, reports on critical issues like remediation and treatment of solid or aqueous wastes, air pollution, sustainability, and sustainable energy. Each issue helps chemical engineers (and those in related fields) stay on top of technological advances in all areas associated with the environment through feature articles, updates, book and software reviews, and editorials.