The role of biochar, natural iron oxides, and nanomaterials as soil amendments for immobilizing metals in shooting range soil

Anushka Upamali Rajapaksha, Mahtab Ahmad, Meththika Vithanage, Kwon Rae Kim, Jun Young Chang, Sang Soo Lee, Yong Sik Ok

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

High concentration of toxic metals in military shooting range soils poses a significant environmental concern due to the potential release of metals, such as Pb, Cu, and Sb, and hence requires remediation. The current study examined the effectiveness of buffalo weed (Ambrosia trifida L.) biomass and its derived biochars at pyrolytic temperatures of 300 and 700 °C, natural iron oxides (NRE), gibbsite, and silver nanoparticles on metal immobilization together with soil quality after 1-year soil incubation. Destructive (e.g., chemical extractions) and non-destructive (e.g., molecular spectroscopy) methods were used to investigate the immobilization efficacy of each amendment on Pb, Cu, and Sb, and to explore the possible immobilization mechanisms. The highest immobilization efficacy was observed with biochar produced at 300 °C, showing the maximum decreases of bioavailability by 94 and 70 % for Pb and Cu, respectively, which were attributed to the abundance of functional groups in the biochar. Biochar significantly increased the soil pH, cation exchange capacity, and P contents. Indeed, the scanning electron microscopic elemental dot mapping and X-ray absorption fine structure spectroscopic (EXAFS) studies revealed associations of Pb with P (i.e., the formation of stable chloropyromorphite [Pb5(PO4)3Cl]) in the biomass- or biochar-amended soils. However, no amendment was effective on Sb immobilization.

Original languageEnglish
Pages (from-to)931-942
Number of pages12
JournalEnvironmental Geochemistry and Health
Volume37
Issue number6
DOIs
Publication statusPublished - 2015 Dec 1
Externally publishedYes

Fingerprint

soil amendment
Iron oxides
Nanostructured materials
iron oxide
immobilization
Metals
Soils
metal
soil
Biomass
Molecular spectroscopy
gibbsite
Poisons
biomass
X ray absorption
Remediation
soil quality
Silver
cation exchange capacity
Functional groups

Keywords

  • Black carbon
  • Charcoal
  • Nanoparticle
  • Slow pyrolysis
  • Soil remediation
  • Synchrotron

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Water Science and Technology
  • Environmental Science(all)
  • Geochemistry and Petrology

Cite this

The role of biochar, natural iron oxides, and nanomaterials as soil amendments for immobilizing metals in shooting range soil. / Rajapaksha, Anushka Upamali; Ahmad, Mahtab; Vithanage, Meththika; Kim, Kwon Rae; Chang, Jun Young; Lee, Sang Soo; Ok, Yong Sik.

In: Environmental Geochemistry and Health, Vol. 37, No. 6, 01.12.2015, p. 931-942.

Research output: Contribution to journalArticle

Rajapaksha, Anushka Upamali ; Ahmad, Mahtab ; Vithanage, Meththika ; Kim, Kwon Rae ; Chang, Jun Young ; Lee, Sang Soo ; Ok, Yong Sik. / The role of biochar, natural iron oxides, and nanomaterials as soil amendments for immobilizing metals in shooting range soil. In: Environmental Geochemistry and Health. 2015 ; Vol. 37, No. 6. pp. 931-942.
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