Chelating, Reducing, and Adsorbing Agents in Geopolymers for Heavy Metals Stabilization from Galvanic Sludge.

ABSTRACT: Hazardous galvanic sludge waste (GSW) from the electroplating industry, produced at 100,000-150,000 tonnes/year in the EU and containing high concentrations of Cr and Ni was successfully treated using metakaolin-based geopolymers via Stabilization/Solidification (S/S). The experimental design incorporated chelating (sodium diethyl dithio carbamate, C₅H₁₀NS₂Na, DTC), reducing (sodium sulfide, Na₂S), and adsorbing (hydroxyapatite, Ca₅(PO₄)₃(OH), Hap) agents separately to improve heavy metal immobilization. The results demonstrated that Na₂S drastically decreased Cr release by -98.7% by reducing mobile Cr(VI) to insoluble Cr(III). DTC reduced Ni leaching by -93.4%, forming sparingly soluble Ni(II)(DTC)

SUBMITTER: Genua F 

PROVIDER: S-EPMC12788012 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature