ZnO/MgO包覆生物炭-膨润土有机矿物复合材料对废水中镉的去除效果研究

IF 6.7 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-09-12 DOI:10.1016/j.jwpe.2025.108712

Saqib Bashir , Yurong Wang , Ziyao Li , Liqin He , Muhammad Adnan , Xingxiang Wang

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引用次数: 0

摘要

镉（Cd）是一种潜在的有毒元素，常见于水环境中，主要是由于全球城市和工业活动的扩张。有机-矿物复合材料的开发是有效去除生态系统中镉的有效途径。研究了生物炭（BC）、膨润土（BT）及其复合材料（BC /BT、ZnO/MgO@BC和ZnO/MgO@BT）对Cd的吸附效果。此外，采用吸附等温线和动力学模型估计了不同pH条件下水溶液对Cd的吸附。Langmuir和Freundlich等温线模型有效地计算和描述了吸附平衡数据，分别证明了单层和非均相吸附机制。与原始BT （62.77 mg/g）和BC （48.62 mg/g）相比，ZnO/MgO@BT和ZnO/MgO@BC的最大吸附量分别为80.10 mg/g和64.55 mg/g。通过FTIR、XRD、SEM-EDS和XPS等光谱分析，证实了Cd吸附在ZnO/MgO@BT和ZnO/MgO@BC上的机理。此外，机理计算也证实了矿物沉淀和离子交换是水溶液中Cd去除的主要机制。总的来说，在所有研究的材料中，ZnO/MgO@BT和ZnO/MgO@BC复合材料对原始BC、BT和BC/BT的吸附能力显著，突出了它们在水处理技术中作为高效环保的Cd去除剂的能力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Enhanced cadmium removal from wastewater using ZnO/MgO coated organo-mineral composites of biochar and bentonite: A comparative adsorption study

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Enhanced cadmium removal from wastewater using ZnO/MgO coated organo-mineral composites of biochar and bentonite: A comparative adsorption study

Cadmium (Cd) is a potential toxic element commonly found in aqueous environments, primarily due to the expansion of urban and industrial activities all around the globe. The development of organo-mineral composites can be a suitable approach for the efficient removal of Cd from ecosystem. This study investigated the adsorption efficiency of biochar (BC), bentonite (BT), and their composites in the form of BC/BT, ZnO/MgO@BC and ZnO/MgO@BT for Cd sorption from the aqueous solution. In addition, adsorption isotherms and kinetics models were employed to estimate the Cd adsorption from the aqueous solutions under varying pH conditions. The adsorption equilibrium data were efficiently calculated and described by both the Langmuir and Freundlich isotherm models, demonstrating monolayer and heterogeneous adsorption mechanisms respectively. The maximum adsorption capacities were estimated at 80.10 mg/g and 64.55 mg/g for ZnO/MgO@BT and ZnO/MgO@BC respectively, when compared with pristine BT (62.77 mg/g) and BC (48.62 mg/g). The insight mechanism of Cd adsorption onto ZnO/MgO@BT and ZnO/MgO@BC was confirmed by the FTIR, XRD, SEM-EDS and XPS spectral analysis. In addition, mechanistic calculations also confirmed that mineral precipitation and ion exchange were the dominant mechanisms contributing to Cd removal from aqueous solution. Overall, among all the studied materials, ZnO/MgO@BT and ZnO/MgO@BC composites expressed the significant adsorption capacities over pristine BC, BT and BC/BT, highlighting their ability as efficient and environmentally friendly sorbents for Cd removal in aqueous remediation technology.

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来源期刊

Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology

CiteScore

10.70

自引率

8.60%

发文量

846

审稿时长

24 days

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