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Effect of Humic Acid on As Redox Transformation and Kinetic Adsorption onto Iron Oxide Based Adsorbent (IBA)

Author

Listed:
  • Hoda Fakour

    (Department of Environmental Engineering, National Cheng Kung University, Tainan 701, Taiwan)

  • Tsair-Fuh Lin

    (Department of Environmental Engineering, National Cheng Kung University, Tainan 701, Taiwan)

Abstract

Due to the importance of adsorption kinetics and redox transformation of arsenic (As) during the adsorption process, the present study elucidated natural organic matter (NOM) effects on As adsorption-desorption kinetics and speciation transformation. The experimental procedures were conducted by examining interactions of arsenate and arsenite with different concentrations of humic acid (HA) as a model representative of NOM, in the presence of iron oxide based adsorbent (IBA), as a model solid surface in three environmentally relevant conditions, including the simultaneous adsorption of both As and HA onto IBA, HA adsorption onto As-presorbed IBA, and As adsorption onto HA-presorbed IBA. Experimental adsorption-desorption data were all fitted by original and modified Lagergren pseudo-first and -second order adsorption kinetic models, respectively. Weber’s intraparticle diffusion was also used to gain insight into the mechanisms and rate controlling steps, which the results suggested that intraparticle diffusion of As species onto IBA is the main rate-controlling step. Different concentrations of HA mediated the redox transformation of As species, with a higher oxidation ability than reduction. The overall results indicated the significant effect of organic matter on the adsorption kinetics and redox transformation of As species, and consequently, the fate, transport and mobility of As in different environmentally relevant conditions.

Suggested Citation

  • Hoda Fakour & Tsair-Fuh Lin, 2014. "Effect of Humic Acid on As Redox Transformation and Kinetic Adsorption onto Iron Oxide Based Adsorbent (IBA)," IJERPH, MDPI, vol. 11(10), pages 1-27, October.
    • Handle: RePEc:gam:jijerp:v:11:y:2014:i:10:p:10710-10736:d:41237
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    References listed on IDEAS

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    1. Shu-Chi Chang & Yu-Han Yu & Cheng-Hao Li & Chin-Ching Wu & Hao-Yun Lei, 2012. "Highly Efficient Arsenic Removal Using a Composite of Ultrafine Magnetite Nanoparticles Interlinked by Silane Coupling Agents," IJERPH, MDPI, vol. 9(10), pages 1-13, October.
    2. Urbain Fifi & Thierry Winiarski & Evens Emmanuel, 2013. "Assessing the Mobility of Lead, Copper and Cadmium in a Calcareous Soil of Port-au-Prince, Haiti," IJERPH, MDPI, vol. 10(11), pages 1-14, November.
    3. Johanna Brinkel & Mobarak H. Khan & Alexander Kraemer, 2009. "A Systematic Review of Arsenic Exposure and Its Social and Mental Health Effects with Special Reference to Bangladesh," IJERPH, MDPI, vol. 6(5), pages 1-11, May.
    4. Jason Roberge & Mary Kay O’Rourke & Maria Mercedes Meza-Montenegro & Luis Enrique Gutiérrez-Millán & Jefferey L. Burgess & Robin B. Harris, 2012. "Binational Arsenic Exposure Survey: Methodology and Estimated Arsenic Intake from Drinking Water and Urinary Arsenic Concentrations," IJERPH, MDPI, vol. 9(4), pages 1-17, March.
    5. Jun Dai & FengLian Ren & ChunYuan Tao, 2012. "Adsorption of Cr(VI) and Speciation of Cr(VI) and Cr(III) in Aqueous Solutions Using Chemically Modified Chitosan," IJERPH, MDPI, vol. 9(5), pages 1-14, May.
    6. Kazuto Sazawa & Masaki Tachi & Takatoshi Wakimoto & Takanori Kawakami & Noriko Hata & Shigeru Taguchi & Hideki Kuramitz, 2011. "The Evaluation for Alterations of DOM Components from Upstream to Downstream Flow of Rivers in Toyama (Japan) Using Three-Dimensional Excitation-Emission Matrix Fluorescence Spectroscopy," IJERPH, MDPI, vol. 8(5), pages 1-16, May.
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