Lead and copper immobilization in a shooting range soil using soybean stover- and pine needle-derived biochars: Chemical, microbial and spectroscopic assessments

Mahtab Ahmad, Yong Sik Ok, Anushka Upamali Rajapaksha, Jung Eun Lim, Byung Yong Kim, Jae Hyung Ahn, Young Han Lee, Mohammad I. Al-Wabel, Sung Eun Lee, Sang Soo Lee

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

Biochar (BC) could be a potential candidate for the remediation of metal contaminated soil. Mechanistic understandings are needed for the appropriate selection of BC and investigating molecular microbial ecological interactions. The soybean stover-derived BCs were more effective in immobilizing Pb (88%) and Cu (87%) than the pine needle-derived BCs in a contaminated shooting range soil. The sequential chemical extractions indicated that BCs stimulated the geochemical transformation of metal species. Spectroscopic investigations using scanning electron microscopic elemental dot mapping and extended X-ray absorption fine structure spectroscopic measurements showed that Pb in the BCs amended soils was immobilized by the formation of stable chloropyromorphite. Soil organic C and microbial activity were also enhanced by BC. The non-labile C fraction in the soil amended with BCs produced at 700. °C was increased. Biochars showed less impact on the bacterial community than feedstock biomass as promulgated by the pyrosequencing of 16S rRNA gene. The feedstock type (namely soybean stover and pine needles) was the main factor influencing the BCs efficacy on metals' (im) mobilization and bacterial health in soils.

Original languageEnglish
Pages (from-to)179-186
Number of pages8
JournalJournal of Hazardous Materials
Volume301
DOIs
Publication statusPublished - 2016 Jan 15
Externally publishedYes

Keywords

  • Biochar
  • EXAFS
  • Metal immobilization
  • Pyrosequencing
  • Soil microbe

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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