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Rapid Degradation of Carbon Tetrachloride by Microscale Ag/Fe Bimetallic Particles

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Listed:
  • Xueqiang Zhu

    (School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China)

  • Lai Zhou

    (School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China)

  • Yuncong Li

    (Department of Soil and Water Sciences, Tropical Research and Education Center, University of Florida, Homestead, FL 33031, USA)

  • Baoping Han

    (School of Geography & Geomatics and Urban-Rural Planning, Jiangsu Normal University, Xuzhou 221116, China)

  • Qiyan Feng

    (School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

Cost-effective zero valent iron (ZVI)-based bimetallic particles are a novel and promising technology for contaminant removal. The objective of this study was to evaluate the effectiveness of CCl 4 removal from aqueous solution using microscale Ag/Fe bimetallic particles which were prepared by depositing Ag on millimeter-scale sponge ZVI particles. Kinetics of CCl 4 degradation, the effect of Ag loading, the Ag/Fe dosage, initial solution pH, and humic acid on degradation efficiency were investigated. Ag deposited on ZVI promoted the CCl 4 degradation efficiency and rate. The CCl 4 degradation resulted from the indirect catalytic reduction of absorbed atomic hydrogen and the direct reduction on the ZVI surface. The CCl 4 degradation by Ag/Fe particles was divided into slow reaction stage and accelerated reaction stage, and both stages were in accordance with the pseudo-first-order reaction kinetics. The degradation rate of CCl 4 in the accelerated reaction stage was 2.29–5.57-fold faster than that in the slow reaction stage. The maximum degradation efficiency was obtained for 0.2 wt.% Ag loading. The degradation efficiency increased with increasing Ag/Fe dosage. The optimal pH for CCl 4 degradation by Ag/Fe was about 6. The presence of humic acid had an adverse effect on CCl 4 removal.

Suggested Citation

  • Xueqiang Zhu & Lai Zhou & Yuncong Li & Baoping Han & Qiyan Feng, 2021. "Rapid Degradation of Carbon Tetrachloride by Microscale Ag/Fe Bimetallic Particles," IJERPH, MDPI, vol. 18(4), pages 1-15, February.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:4:p:2124-:d:503629
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    References listed on IDEAS

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    1. Alazne Galdames & Leire Ruiz-Rubio & Maider Orueta & Miguel Sánchez-Arzalluz & José Luis Vilas-Vilela, 2020. "Zero-Valent Iron Nanoparticles for Soil and Groundwater Remediation," IJERPH, MDPI, vol. 17(16), pages 1-23, August.
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