4.7 Article

Enhanced nitrobenzene removal in soil by biochar supported sulfidated nano zerovalent iron: Solubilization effect and mechanism

期刊

SCIENCE OF THE TOTAL ENVIRONMENT
卷 826, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.scitotenv.2022.153960

关键词

Biochar; Sul fidated nano zerovalent iron; Solubilization; Nitrobenzene; Soil remediation

资金

  1. National Key Research & Development Program of China [2018YFC1802002]
  2. Opening Fund of National Engineering Laboratory for Site Remediation Technology [JGXF19-J055-01]
  3. National Natural Science Foundation of China [U1806216, 41807363]
  4. 111 program, Ministry of Education of China [T2017002]

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This study successfully synthesized biochar-supported sulfidated nano zerovalent iron (S-nZVI@BC) and demonstrated its effectiveness in the reductive degradation of soil-sorbed contaminants. The as-synthesized composite showed superior nitrobenzene (NB) removal and aniline (AN) formation efficiencies compared to S-nZVI alone. Furthermore, the addition of biochar enhanced the solubilization of NB from soil. Overall, this research highlights the potential of S-nZVI@BC in enhancing the in-situ remediation of NB-contaminated soil.
Sulfidated nano zerovalent iron (S-nZVI) is reported to be effective in removal of aqueous organic contaminants. However, little is known about its potential use in reductive degradation of soil-sorbed contaminants. In this study, biochar (BC) supported S-nZVI (S-nZVI@BC) was successfully synthesized through sulfidation and carbon loading modification, which effectively combined the solubilization characteristics of BC and high reduction characteristics of SnZVI. Transmission electron microscopy (TEM) with an energy-dispersive X-ray spectroscopy (EDS) analysis suggested that sulfur and iron were evenly distributed throughout BC matrix. The degradation of nitrobenzene (NB) in soil was achieved more efficiently with the as-synthesized S-nZVI@BC composites. Results indicated that S-nZVI@BC with SnZVI/BC mass ratio of 3:1, dosage of 10 mg/g exhibited superior NB removal (98%) and aniline (AN) formation (90%) efficiency within 24 h without formation of other intermediates, higher than those of S-nZVI. Meanwhile, the surface FeSX layer enhanced the antioxidant capacity of S-nZVI@BC and participated in the reduction of NB. The soil-sorbed NB decreased from 14% to 1.4%, indicating that the addition of BC played an important role in solubilization of NB from soil. Solubilization-reduction was the dominant mechanism for NB removal. This research indicated that S-nZVI@BC held the potential to enhance in-situ remediation of NB-contaminated soil.

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