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Synthesis of Nanoscale Zerovalent Iron (nZVI) Supported on Biochar for Chromium Remediation from Aqueous Solution and Soil

Author

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  • Haixia Wang

    (School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China
    Shandong Provincial Engineering Technology Research Center for Ecological Carbon Sink and Capture Utilization, Jinan 250022, China)

  • Mingliang Zhang

    (School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China
    Shandong Provincial Engineering Technology Research Center for Ecological Carbon Sink and Capture Utilization, Jinan 250022, China)

  • Hongyi Li

    (School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China)

Abstract

Maize straw biochar-supported nanoscale zero-valent iron composite (MSB-nZVI) was prepared for efficient chromium (Cr) removal through alleviating the aggregation of zero-valent iron particles. The removal mechanism of MSB-nZVI was investigated by scanning electron microscopy with energy dispersive X-ray (SEM-EDX), X-ray diffractometry (XRD), and X-ray photoelectron spectroscopy (XPS). Cr(VI) removal from aqueous solution by MSB-nZVI was greatly affected by pH and initial concentration. The removal efficiency of Cr(VI) decreased with increasing pH, and the removal kinetics followed the pseudo-second-order model. XRD patterns of MSB-nZVI before and after reaction showed that reduction and precipitation/co-precipitation (FeCr 2 O 4 , Fe 3 O 4 , Fe 2 O 3 ) occurred with the conversion of Cr(VI) to Cr(III) and Fe(0) to Fe(II)/Fe(III). The produced precipitation/co-precipitation could be deposited on the MSB surface rather than being only coated on the surface of nZVI particles, which can alleviate passivation of nZVI. For remediation of Cr(VI)-contaminated saline–alkali soil (pH 8.6–9.0, Cr 341 mg/kg), the released amount of Cr(VI) was 70.7 mg/kg, while it sharply decreased to 0.6–1.7 mg/kg at pH 4.0–8.0, indicating that the saline–alkali environment inhibited the remediation efficiency. These results show that MSB-nZVI can be used as an effective material for Cr(VI) removal from aqueous solution and contaminated soil.

Suggested Citation

  • Haixia Wang & Mingliang Zhang & Hongyi Li, 2019. "Synthesis of Nanoscale Zerovalent Iron (nZVI) Supported on Biochar for Chromium Remediation from Aqueous Solution and Soil," IJERPH, MDPI, vol. 16(22), pages 1-15, November.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:22:p:4430-:d:286115
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    Citations

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    Cited by:

    1. Muhammad Asaad Bashir & Xiukang Wang & Muhammad Naveed & Adnan Mustafa & Sobia Ashraf & Tayyaba Samreen & Sajid Mahmood Nadeem & Moazzam Jamil, 2021. "Biochar Mediated-Alleviation of Chromium Stress and Growth Improvement of Different Maize Cultivars in Tannery Polluted Soils," IJERPH, MDPI, vol. 18(9), pages 1-24, April.
    2. Daixi Zhou & Guangyu Xie & Xinjiang Hu & Xiaoxi Cai & Yunlin Zhao & Xi Hu & Qi Jin & Xiaohua Fu & Xiaofei Tan & Chong Liang & Kaiqi Lai & Hui Wang & Chunfang Tang, 2020. "Coupling of kenaf Biochar and Magnetic BiFeO 3 onto Cross-Linked Chitosan for Enhancing Separation Performance and Cr(VI) Ions Removal Efficiency," IJERPH, MDPI, vol. 17(3), pages 1-17, January.

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