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This investigation assessed the heavy metal extraction efficiency of six chelating agents (EDTA, DTPA, NTA, SDS, EGTA, and EDDS) for Pb, Cr, Cd, and Cu remediation in three clay matrices (kaolinite, dolomite, and bentonite). The experimental protocol maintained a 1:15 solid-liquid ratio, with chelator concentrations ranging from 0.01 M to 0.5 M (0.01 M, 0.055 M, 0.1 M, 0.5 M). Extraction occurred over 2 h at 100 RPM agitation. Key findings revealed that for lead removal, EDTA demonstrated optimal performance in bentonite (80% Pb extraction). Extraction efficiency varied by substrate: kaolinite: DTPA > EDTA > NTA > SDS > EGTA > EDDS; dolomite: EDTA > DTPA > NTA > EGTA > SDS > EDDS; and bentonite: EDTA > SDS > NTA > EDDS > DTPA > EGTA. For chromium, the maximum Cr removal (76%) occurred with 0.5 M EDDS in bentonite, though concentration increases showed limited additional benefit. Alkaline conditions enhanced Cr extraction through solid-phase dissolution and hydrolysis suppression. For cadmium and copper, bentonite yielded peak removal efficiencies (Cd: 72% at 0.1 M EDTA; Cu: 80% at 0.5 M EDTA). The results suggest that single-extractant systems may be insufficient for complete heavy metal remediation. A sequential extraction approach employing multiple solvents could potentially improve contaminant elimination from clay substrates.

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A Comparative Analysis of Extractants for the Removal of Heavy Metals from Artificially Contaminated Clayey Soil

  • 会议论文

  • 发表日期：

    2026年

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  • Bibhabasu Mohanty,
  • Meet Dhamsaniya,
  • Piyush J. Patel,
  • Yogesh S. Patel

摘要

This investigation assessed the heavy metal extraction efficiency of six chelating agents (EDTA, DTPA, NTA, SDS, EGTA, and EDDS) for Pb, Cr, Cd, and Cu remediation in three clay matrices (kaolinite, dolomite, and bentonite). The experimental protocol maintained a 1:15 solid-liquid ratio, with chelator concentrations ranging from 0.01 M to 0.5 M (0.01 M, 0.055 M, 0.1 M, 0.5 M). Extraction occurred over 2 h at 100 RPM agitation. Key findings revealed that for lead removal, EDTA demonstrated optimal performance in bentonite (80% Pb extraction). Extraction efficiency varied by substrate: kaolinite: DTPA > EDTA > NTA > SDS > EGTA > EDDS; dolomite: EDTA > DTPA > NTA > EGTA > SDS > EDDS; and bentonite: EDTA > SDS > NTA > EDDS > DTPA > EGTA. For chromium, the maximum Cr removal (76%) occurred with 0.5 M EDDS in bentonite, though concentration increases showed limited additional benefit. Alkaline conditions enhanced Cr extraction through solid-phase dissolution and hydrolysis suppression. For cadmium and copper, bentonite yielded peak removal efficiencies (Cd: 72% at 0.1 M EDTA; Cu: 80% at 0.5 M EDTA). The results suggest that single-extractant systems may be insufficient for complete heavy metal remediation. A sequential extraction approach employing multiple solvents could potentially improve contaminant elimination from clay substrates.