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Complexation of Antimony with Natural Organic Matter: Performance Evaluation during Coagulation-Flocculation Process

Author

Listed:
  • Muhammad Ali Inam

    (Graduate School of Water Resources, Sungkyunkwan University (SKKU) 2066, Suwon 16419, Korea)

  • Rizwan Khan

    (Graduate School of Water Resources, Sungkyunkwan University (SKKU) 2066, Suwon 16419, Korea)

  • Du Ri Park

    (Graduate School of Water Resources, Sungkyunkwan University (SKKU) 2066, Suwon 16419, Korea)

  • Sarfaraz Khan

    (Key Laboratory of the Three Gorges Reservoir Region Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, China)

  • Ahmed Uddin

    (Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Sciences and Technology, Nanjing 210094, China)

  • Ick Tae Yeom

    (Graduate School of Water Resources, Sungkyunkwan University (SKKU) 2066, Suwon 16419, Korea)

Abstract

The presence of natural organic matter (NOM) in drinking water sources can stabilize toxic antimony (Sb) species, thus enhancing their mobility and causing adverse effects on human health. Therefore, the present study aims to quantitatively explore the complexation of hydrophobic/hydrophilic NOM, i.e., humic acid (HA), salicylic acid (SA), and L-cysteine (L-cys), with Sb in water. In addition, the removal of Sb(III, V) species and total organic carbon (TOC) was evaluated with ferric chloride (FC) as a coagulant. The results showed a stronger binding affinity of hydrophobic HA as compared to hydrophilic NOM. The optimum FC dose required for Sb(V) removal was found to be higher than that for Sb(III), due to the higher complexation ability of hydrophobic NOM with antimonate than antimonite. TOC removal was found to be higher in hydrophobic ligands than hydrophilic ligands. The high concentration of hydrophobic molecules significantly suppresses the Sb adsorption onto Fe precipitates. An isotherm study suggested a stronger adsorption capacity for the hydrophobic ligand than the hydrophilic ligand. The binding of Sb to NOM in the presence of active Fe sites was significantly reduced, likely due to the adsorption of contaminants onto precipitated Fe. The results of flocs characteristics revealed that mechanisms such as oxidation, complexation, charge neutralization, and adsorption may be involved in the removal of Sb species from water. This study may provide new insights into the complexation behavior of Sb in NOM-laden water as well as the optimization of the coagulant dose during the water treatment process.

Suggested Citation

  • Muhammad Ali Inam & Rizwan Khan & Du Ri Park & Sarfaraz Khan & Ahmed Uddin & Ick Tae Yeom, 2019. "Complexation of Antimony with Natural Organic Matter: Performance Evaluation during Coagulation-Flocculation Process," IJERPH, MDPI, vol. 16(7), pages 1-16, March.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:7:p:1092-:d:217518
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    References listed on IDEAS

    as
    1. Rizwan Khan & Muhammad Ali Inam & Muhammad Mazhar Iqbal & Muhammad Shoaib & Du Ri Park & Kang Hoon Lee & Sookyo Shin & Sarfaraz Khan & Ick Tae Yeom, 2018. "Removal of ZnO Nanoparticles from Natural Waters by Coagulation-Flocculation Process: Influence of Surfactant Type on Aggregation, Dissolution and Colloidal Stability," Sustainability, MDPI, vol. 11(1), pages 1-22, December.
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    Cited by:

    1. Dae Wook Kim & Sung Il Yu & Kyuyong Im & Juhee Shin & Seung Gu Shin, 2022. "Responses of Coagulant Type, Dosage and Process Conditions to Phosphate Removal Efficiency from Anaerobic Sludge," IJERPH, MDPI, vol. 19(3), pages 1-9, February.
    2. Fuguo Qiu & Huadong Lv & Xiao Zhao & Dongye Zhao, 2019. "Impact of an Extreme Winter Storm Event on the Coagulation/Flocculation Processes in a Prototype Surface Water Treatment Plant: Causes and Mitigating Measures," IJERPH, MDPI, vol. 16(15), pages 1-15, August.
    3. Argyrios Periferakis & Ana Caruntu & Aristodemos-Theodoros Periferakis & Andreea-Elena Scheau & Ioana Anca Badarau & Constantin Caruntu & Cristian Scheau, 2022. "Availability, Toxicology and Medical Significance of Antimony," IJERPH, MDPI, vol. 19(8), pages 1-29, April.

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