SYNERGISTIC REMOVAL OF Cu, Co, Ni AND Cr FROM CONTAMINATED SOIL BY BIOCHAR-SUPPORTED NANOSCALE ZERO-VALENT IRON

XI Dong-dong; LI Xiao-min; XIONG Zi-xuan; JIANG Zhi; ZHANG Xiao-ming; YANG Wei-chun

doi:10.13205/j.hjgc.202006010

Volume 38 Issue 6

Aug. 2020

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2020 > 38(6): 58-66

XI Dong-dong, LI Xiao-min, XIONG Zi-xuan, JIANG Zhi, ZHANG Xiao-ming, YANG Wei-chun. SYNERGISTIC REMOVAL OF Cu, Co, Ni AND Cr FROM CONTAMINATED SOIL BY BIOCHAR-SUPPORTED NANOSCALE ZERO-VALENT IRON[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(6): 58-66. doi: 10.13205/j.hjgc.202006010

Citation:

XI Dong-dong, LI Xiao-min, XIONG Zi-xuan, JIANG Zhi, ZHANG Xiao-ming, YANG Wei-chun. SYNERGISTIC REMOVAL OF Cu, Co, Ni AND Cr FROM CONTAMINATED SOIL BY BIOCHAR-SUPPORTED NANOSCALE ZERO-VALENT IRON[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(6): 58-66. doi: 10.13205/j.hjgc.202006010

Citation:

XI Dong-dong, LI Xiao-min, XIONG Zi-xuan, JIANG Zhi, ZHANG Xiao-ming, YANG Wei-chun. SYNERGISTIC REMOVAL OF Cu, Co, Ni AND Cr FROM CONTAMINATED SOIL BY BIOCHAR-SUPPORTED NANOSCALE ZERO-VALENT IRON[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(6): 58-66. doi: 10.13205/j.hjgc.202006010

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SYNERGISTIC REMOVAL OF Cu, Co, Ni AND Cr FROM CONTAMINATED SOIL BY BIOCHAR-SUPPORTED NANOSCALE ZERO-VALENT IRON

doi: 10.13205/j.hjgc.202006010

School of Metallurgy and Environment, Central South University, Changsha 410006, China

Received Date: 2020-03-24

Abstract

Abstract

In this study, a low-cost and highly efficient composite material (ZVI-SM) with nanoscale zero-valent iron loaded by biochar was synthesized and applied to the remediation of copper, cobalt, nickel and chromium contaminated soil. The effects of biochar precursors and biochar composites prepared at different carbonation temperatures on the remediation of heavy metal contamination, and their removal mechanisms were investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and metal adsorption experiment. FeCr₂O₄ formed by adsorption and reduction greatly reduced the toxicity of chromium and improved the removal efficiency of copper, cobalt and nickel. The introduction of Fe⁰ not only increased the adsorption capacity of heavy metals to biochar, but also solved the problem of toxicity of Cr(Ⅵ). XPS further clarified that biochar could be used as the electron transfer medium; the strong interaction between the gain and loss electrons of the surface functional groups; Fe⁰ could enhance the removal effect of the composite material on multi-heavy metal ions; besides ZVI-SM500, the removal rates of rest of the four materials, ZVI-SM100, 300, 400, 700 for copper, cobalt, nickel, chromium were much higher than the commercial nanoscale Fe⁰ and single application of biological carbon materials; this kind of composite material (ZVI-SM) showed a strong affinity and reactivity to chromium and copper, and completely removed copper and chromium in 5 minutes. Cobalt and nickel could also achieve more than 80% removal rate in 180 minutes. There was a significant ion competition effect in the reaction process in the order of Cr≥Cu>Co>Ni, consistent with the trend of the standard reduction potential of metal ions. Soil remediation experiments showed that ZNI-SM300 for remediation of contaminated soil, after 15 days, the content of Cr(Ⅵ) decreased from 480 mg/kg to 0.52 mg/kg, and the total amount of water-soluble Cr decreased from 500 mg/kg to 1.2 mg/kg. The immobilization efficiency of both was more than 99%, while the total removal effect of water-soluble copper, cobalt, nickel and Cr(Ⅵ) was achieved. Therefore, the nanoscale zero-valent iron with SM300 as the carrier could be used as the ideal material for the remediation of soil contaminated by composite heavy metals.
- biochar,
- Fe⁰,
- hexavalent chromium,
- reduction,
- heavy metal,
- collaborative removal

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References(28)

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