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Thermodynamics, Kinetics, and Mechanisms of the Co-Removal of Arsenate and Arsenite by Sepiolite-Supported Nanoscale Zero-Valent Iron in Aqueous Solution

Author

Listed:
  • Meihaguli Ainiwaer

    (Key Laboratory of Agro-Environment, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Sciences, Ministry of Agriculture and Rural Affairs, Beijing 100081, China
    College of Natural Resources and Environment, Northwest A&F University, Yangling, Xianyang 712100, China)

  • Xibai Zeng

    (Key Laboratory of Agro-Environment, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Sciences, Ministry of Agriculture and Rural Affairs, Beijing 100081, China
    College of Natural Resources and Environment, Northwest A&F University, Yangling, Xianyang 712100, China)

  • Xianqiang Yin

    (College of Natural Resources and Environment, Northwest A&F University, Yangling, Xianyang 712100, China)

  • Jiong Wen

    (Scientific Observation and Experiment Station of Yueyang, Ministry of Agriculture, Yueyang Agricultural Research Academy, Yueyang 414021, China)

  • Shiming Su

    (Key Laboratory of Agro-Environment, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Sciences, Ministry of Agriculture and Rural Affairs, Beijing 100081, China)

  • Yanan Wang

    (Key Laboratory of Agro-Environment, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Sciences, Ministry of Agriculture and Rural Affairs, Beijing 100081, China)

  • Yang Zhang

    (Key Laboratory of Agro-Environment, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Sciences, Ministry of Agriculture and Rural Affairs, Beijing 100081, China)

  • Tuo Zhang

    (Key Laboratory of Agro-Environment, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Sciences, Ministry of Agriculture and Rural Affairs, Beijing 100081, China
    College of Environmental Science & Engineering, China West Normal University, Nanchong 637009, China)

  • Nan Zhang

    (Key Laboratory of Agro-Environment, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Sciences, Ministry of Agriculture and Rural Affairs, Beijing 100081, China)

Abstract

In this study, a newly synthesized sepiolite-supported nanoscale zero-valent iron (S-nZVI) adsorbent was tested for the efficient removal of As(III) and As(V) in aqueous solution. Compared with ZVI nanoparticles, the As(III) and As(V) adsorption abilities of S-nZVI were substantially enhanced to 165.86 mg/g and 95.76 mg/g, respectively, owing to the good dispersion of nZVI on sepiolite. The results showed that the adsorption kinetics were well fitted with the pseudo-second-order model, and the adsorption isotherms were fitted with the Freundlich model, denoting a multilayer chemical adsorption process. The increase in the initial solution pH of the solution inhibited As(III) and As(V) adsorption, but a weaker influence on As(III) than As(V) adsorption was observed with increasing pH. Additionally, the presence of SO 4 2− and NO 3 − ions had no pronounced effect on As(III) and As(V) removal, while PO 4 3− and humic acid (HA) significantly restrained the As(III) and As(V) adsorption ability, and Mg 2+ /Ca 2+ promoted the As(V) adsorption efficiency. Spectral analysis showed that As(III) and As(V) formed inner-sphere complexes on S-nZVI. As(III) oxidation and As(V) reduction occurred with the adsorption process on S-nZVI. Overall, the study demonstrated a potential adsorbent, S-nZVI, for the efficient removal of As(III) and As(V) from contaminated water.

Suggested Citation

  • Meihaguli Ainiwaer & Xibai Zeng & Xianqiang Yin & Jiong Wen & Shiming Su & Yanan Wang & Yang Zhang & Tuo Zhang & Nan Zhang, 2022. "Thermodynamics, Kinetics, and Mechanisms of the Co-Removal of Arsenate and Arsenite by Sepiolite-Supported Nanoscale Zero-Valent Iron in Aqueous Solution," IJERPH, MDPI, vol. 19(18), pages 1-13, September.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:18:p:11401-:d:911819
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    References listed on IDEAS

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    1. Zongqiang Zhu & Shuai Zhou & Xiaobin Zhou & Shengpeng Mo & Yinian Zhu & Lihao Zhang & Shen Tang & Zhanqiang Fang & Yinming Fan, 2022. "Effective Remediation of Arsenic-Contaminated Soils by EK-PRB of Fe/Mn/C-LDH: Performance, Characteristics, and Mechanism," IJERPH, MDPI, vol. 19(7), pages 1-15, April.
    2. Wolfram Adlassnig & Brigitte Schmidt & Franz Jirsa & Andreas Gradwohl & Caroline Ivesic & Marianne Koller-Peroutka, 2022. "The Arsenic–Antimony Creek at Sauerbrunn/Burgenland, Austria: A Toxic Habitat for Amphibians," IJERPH, MDPI, vol. 19(10), pages 1-15, May.
    3. Asmat Ali & Maria Siddique & Wei Chen & Zhixin Han & Romana Khan & Muhammad Bilal & Ummara Waheed & Irum Shahzadi, 2022. "Promising Low-Cost Adsorbent from Waste Green Tea Leaves for Phenol Removal in Aqueous Solution," IJERPH, MDPI, vol. 19(11), pages 1-15, May.
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