FeCl3/十二烷基二甲基氯化铵改性活性炭对水中高氯酸盐的吸附：协同效应及机理研究

IF 7.1 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation Pub Date : 2025-07-25 DOI:10.1016/j.eti.2025.104400

Yuanxiang Shan , Yannan Jia , Xiaomei Wu , Nannan Xu , Zhendong Liu , Lu Li , Zhiwei Wang , Wanting Feng , Weixiao Gong , Haichen Cui , Zheng Wang

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引用次数: 0

摘要

高氯酸盐（ClO4-）是一种稳定的单价离子，具有四面体结构，难以从环境中去除。采用FeCl3和季铵盐十二烷基二甲基氯化铵（DDAC）对颗粒活性炭（GAC）进行改性，以去除水中的高氯酸盐。结果表明，最佳试剂负载为2.5 g GAC， 5 g FeCl3和2.5 mmol/L DDAC，生成Fe(5)-DDAC-GAC，高氯酸盐吸附量为31.59 mg/g，去除率为62.62 %。改性活性炭对ClO4-的吸附更符合准初级动力学模型和Langer-Muir等温线模型。Fe(5)-DDAC-GAC在弱酸性至中性条件下对高氯酸盐具有良好的吸附性能，pH为4时吸附效果最佳（33.93 mg/g，去除率为67.25 %）。干扰离子对ClO4-吸附的影响顺序为CO32- >； SO42- >； BrO3- >； PO43-。饱和Fe(5)-DDAC-GAC可通过NaCl或超声波再生，且NaCl再生效率更高(初始吸附量的66.6% % （NaCl) vs 55.5% %（超声波））。

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Adsorption of perchlorate in water by FeCl3/dodecyldimethylammonium-chloride-modified activated carbon: Synergistic effect and mechanistic study

Perchlorate (ClO₄^-) is a stable monovalent ion with a tetrahedral structure that is difficult to remove from the environment. In this study, granular activated carbon (GAC) was modified with FeCl₃ and the quaternary ammonium salt dodecyldimethylammonium chloride (DDAC) for the removal of perchlorate from water. The optimal reagent loading was found to be 2.5 g of GAC modified with 5 g of FeCl₃ and 2.5 mmol/L of DDAC, generating Fe(5)-DDAC-GAC with a perchlorate adsorption of 31.59 mg/g and removal rate of 62.62 %. The adsorption of ClO₄^- by modified activated carbon is more in line with the quasi-primary kinetic model and the Langer-Muir isotherm model. Fe(5)-DDAC-GAC showed good adsorption of perchlorate under weak-acidic to neutral conditions, with optimal adsorption at pH 4 (33.93 mg/g and a removal rate of 67.25 %). The effect of interfering ions on the adsorption of ClO₄^- decreased in the order CO₃^2- > SO₄^2- > BrO₃^- > PO₄^3-. The saturated Fe(5)-DDAC-GAC could be regenerated by NaCl or ultrasonication, with NaCl regeneration being more efficient (66.6 % (NaCl) vs. 55.5 % (ultrasonication) of the initial adsorption capacity).

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来源期刊

Environmental Technology & Innovation Environmental Science-General Environmental Science

CiteScore

14.00

自引率

4.20%

发文量

435

审稿时长

74 days

期刊介绍： Environmental Technology & Innovation adopts a challenge-oriented approach to solutions by integrating natural sciences to promote a sustainable future. The journal aims to foster the creation and development of innovative products, technologies, and ideas that enhance the environment, with impacts across soil, air, water, and food in rural and urban areas. As a platform for disseminating scientific evidence for environmental protection and sustainable development, the journal emphasizes fundamental science, methodologies, tools, techniques, and policy considerations. It emphasizes the importance of science and technology in environmental benefits, including smarter, cleaner technologies for environmental protection, more efficient resource processing methods, and the evidence supporting their effectiveness.