High-efficiency simultaneous removal of Cr(VI) and As(V) by La-modified UiO-66: competition and synergy

IF 6.7 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-09-17 DOI:10.1016/j.jwpe.2025.108713

Xixiang Liu , Xiurong Chen , Yongming Luo , Caiyun Han , SuFang He

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Abstract

Much research has focused on the removal of individual contaminants such as As(V) or Cr(VI) from wastewater. However, limited efforts have been devoted to their simultaneous removal in binary systems. This is largely due to the complexity of wastewater matrices and the similar chemical characteristics of As(V) and Cr(VI). In this study, La-modified UiO-66 was synthesized by a one-pot method and employed as a multifunctional adsorbent to simultaneously remove As(V) and Cr(VI) via batch experiments. Characterization results demonstrated that La was successfully grafted onto UiO-66 through Zr-ligand (O)-La and Zr-ligand (O)-Zr linkages, while the fcu structural topology and microporous nature of UiO-66 were well remained. For simultaneous uptake of As(V) and Cr(VI), a synergistic effect of Cr(VI) was observed on As(V) removal, whereas As(V) exhibited an inhibitory effect on Cr(VI) adsorption. Compared with the single component system, the adsorption capacity of As(V) in the binary system increased by approximately 26 %, while the adsorption capacity of Cr(VI) decreased by about 20 %. The enhanced uptake of As(V) was attributed to the formation of a new CrAs complex compound between adsorbed Cr(III) and As(V). In contrast, the inhibitory influence of As(V) on Cr(VI) adsorption was ascribed to the strong affinity of As(V) for the active adsorption sites. Overall, these results demonstrate that La-modified UiO-66 is a promising candidate for the simultaneous removal of As(V) and Cr(VI) in binary systems, particularly under conditions of elevated As(V) concentration.

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la改性UiO-66高效同时去除Cr（VI）和As(V)：竞争与协同作用

许多研究都集中在去除废水中的单个污染物，如砷(V)或铬（VI）。然而，致力于在双星系统中同时去除它们的努力有限。这主要是由于废水基质的复杂性以及As(V)和Cr（VI）的相似化学特性。本研究采用一锅法合成了la修饰的UiO-66，并通过批量实验将其作为多功能吸附剂同时去除as (V)和Cr（VI）。表征结果表明，La通过zr -配体(O)-La和zr -配体(O)-Zr键成功接枝到UiO-66上，同时保持了UiO-66的fcu结构拓扑和微孔性质。同时吸附As(V)和Cr（VI）时，Cr（VI）对As(V)有协同去除作用，而As(V)对Cr（VI）有抑制作用。与单组分体系相比，二元体系对As(V)的吸附量增加了约26%，而对Cr（VI）的吸附量下降了约20%。吸附的Cr（III）和As(V)之间形成了一种新的CrAs络合物，从而增强了As(V)的吸收。相反，As(V)对Cr（VI）吸附的抑制作用归因于As(V)对活性吸附位点的强亲和力。总之，这些结果表明，la修饰的UiO-66是同时去除二元体系中As(V)和Cr（VI）的有希望的候选材料，特别是在As(V)浓度升高的条件下。

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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