Layered double hydroxides for industrial wastewater remediation: A review

IF 5.2 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today Pub Date : 2024-10-19 DOI:10.1016/j.cattod.2024.115101

Sudarshan Sarkar, Chandan Upadhyay

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引用次数: 0

Abstract

Tanneries and textile industries significantly impact aquatic ecosystems through the discharge of effluents containing heavy metals, dyes, and metal-resistant bacterial pathogens. This review examines the potential of layered double hydroxides (LDHs) for addressing these environmental challenges. It offers a comprehensive analysis of LDH morphology, synthesis techniques, and performance in wastewater remediation. LDHs are ionic lamellar hydroxides, containing two different metal cations in the main layers and anionic species in the interlayer, have attracted substantial research interest due to their ease of synthesis and unique properties. This review distinguishes itself by correlating various synthesis methods for LDHs directly with their efficacy in wastewater remediation, offering insights not typically covered in other reviews. Furthermore, the review explores the critical role of interlayer anions, such as carbonate and sulfate, in determining its influence in the structural, chemical, and physical properties of LDHs. It also addresses how modifications with graphitic carbon nitride (gC₃N₄) and graphene-based materials enhance LDH’s performance by increasing surface area, delaying charge recombination, and improving adsorption and photocatalytic activity. he review evaluates the impact of these factors on the removal of pollutants from wastewater and provides an in-depth discussion of the mechanisms involved in pollutant removal, including adsorption, ion exchange, and photocatalysis. It also highlights the antibacterial properties of LDHs, particularly when combined with advanced materials, demonstrating their potential antimicrobial efficacy. In addition to presenting a fresh perspective on the correlation between synthesis methods and performance outcomes, this review offers a comprehensive overview of the limitations and challenges associated with LDH technologies. It provides valuable insights into the optimization process and practical considerations, making it an essential resource for advancing LDH technologies in real-world wastewater treatment applications.

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用于工业废水修复的层状双氢氧化物：综述

制革厂和纺织业排放的污水中含有重金属、染料和抗金属细菌病原体，对水生生态系统造成了严重影响。本综述探讨了层状双氢氧化物（LDH）在应对这些环境挑战方面的潜力。文章全面分析了 LDH 的形态、合成技术以及在废水修复方面的性能。LDHs 是一种离子片状氢氧化物，主层中含有两种不同的金属阳离子，夹层中含有阴离子，由于其易于合成和独特的性质，已经引起了大量的研究兴趣。本综述与众不同之处在于将 LDHs 的各种合成方法与其在废水修复中的功效直接联系起来，提供了其他综述通常未涉及的见解。此外，本综述还探讨了层间阴离子（如碳酸盐和硫酸盐）在决定 LDHs 的结构、化学和物理性质方面的关键作用。综述还探讨了氮化石墨碳（gC3N4）和石墨烯基材料的改性如何通过增加表面积、延迟电荷重组以及改善吸附和光催化活性来提高 LDH 的性能。综述评估了这些因素对去除废水中污染物的影响，并深入讨论了污染物去除所涉及的机制，包括吸附、离子交换和光催化。报告还强调了 LDHs 的抗菌特性，尤其是在与先进材料相结合时，展示了其潜在的抗菌功效。除了以全新的视角探讨合成方法与性能结果之间的关系外，本综述还全面概述了与 LDH 技术相关的局限性和挑战。它为优化过程和实际考虑因素提供了宝贵的见解，使其成为在实际废水处理应用中推进 LDH 技术的重要资源。

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

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.