Enhanced phosphorus adsorption performance of ZnAl-LDO by fluorine‑chlorine co-doping and synergistic mechanism exploration.

IF 8.2 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Science of the Total Environment Pub Date : 2024-12-10 Epub Date: 2024-10-20 DOI:10.1016/j.scitotenv.2024.177102

Anzhou Yang, Yongping Fu, Fuqiang Huang

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Abstract

Layered double hydroxides (LDHs) and their calcined products layered double oxides (LDOs) are widely used as adsorbents for pollutant removal. Their adsorption performance are significantly influenced by intercalated ions, while previous studies primarily focusing on the impact of individual ions. For the first time, this paper reports the mechanism of the synergistic enhancement of phosphate adsorption properties of LDO by bicomponent interlayer ions. The ZnAl-LDO by fluorine‑chlorine co-doping (F, Cl-ZnAl-LDO) exhibits excellent adsorption capacity of 158.9 mg_P/g, surpassing that of single-component intercalation Cl-ZnAl-LDO and F-ZnAl-LDO, as well as most LDH-based adsorbents. Further research and density functional theory calculations indicate the differential adsorption enhancement mechanism of the interlayer ions. Chlorine functions as the exchanged anion, whereas fluorine facilitates the complete replacement of chloride ions and hydroxyl groups by phosphate. This finding highlights the potential of utilizing the synergistic effects between different interlayer ions to design and synthesize advanced phosphate adsorbent materials.

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氟氯共掺增强 ZnAl-LDO 的磷吸附性能及协同机理探究

层状双氢氧化物（LDHs）及其煅烧产物层状双氧化物（LDOs）被广泛用作去除污染物的吸附剂。它们的吸附性能受插层离子的影响很大，而以前的研究主要集中在单个离子的影响上。本文首次报道了双组分夹层离子协同增强 LDO 磷酸盐吸附性能的机理。氟氯共掺的 ZnAl-LDO （F，Cl-ZnAl-LDO）表现出 158.9 mgP/g 的优异吸附容量，超过了单组分插层的 Cl-ZnAl-LDO 和 F-ZnAl-LDO，也超过了大多数基于 LDH 的吸附剂。进一步的研究和密度泛函理论计算表明了层间离子的差异吸附增强机制。氯起到了交换阴离子的作用，而氟则有助于磷酸盐完全取代氯离子和羟基。这一发现凸显了利用不同层间离子之间的协同效应来设计和合成先进磷酸盐吸附材料的潜力。

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来源期刊

Science of the Total Environment 环境科学-环境科学

CiteScore

17.60

自引率

10.20%

发文量

8726

审稿时长

2.4 months

期刊介绍： The Science of the Total Environment is an international journal dedicated to scientific research on the environment and its interaction with humanity. It covers a wide range of disciplines and seeks to publish innovative, hypothesis-driven, and impactful research that explores the entire environment, including the atmosphere, lithosphere, hydrosphere, biosphere, and anthroposphere. The journal's updated Aims & Scope emphasizes the importance of interdisciplinary environmental research with broad impact. Priority is given to studies that advance fundamental understanding and explore the interconnectedness of multiple environmental spheres. Field studies are preferred, while laboratory experiments must demonstrate significant methodological advancements or mechanistic insights with direct relevance to the environment.