Abstract

Nanoscale zero-valent iron (NZVI) was synthesized and tested to remediate DDT (Dichlorodiphenyltrichloroethane) from the contaminated water. The influence of experimental variables such as reaction time, NZVI particle dosage and pH were studied. Mixing an aqueous solution of 3 mg L^-1 DDT with 30 mg L^-1 Fe⁰ resulted in 99.2% loss of DDT within 4 h. Solvent extraction of the Fe⁰ revealed that DDT removal was not through adsorption and as Fe⁰ treatment of DDT lead to new chromatographic peaks (degradation products) in GC analysis and chloride release, removal occurred through dechlorination. GC/MS analysis confirmed the formation of completely dechlorinated hydrocarbon skeleton of DDT namely, diphenylethane (DPE), as the end product in this treatment; thereby implying the removal of all five chlorine atoms (three alkyl and two aryl) of DDT.

Keywords

Nano zero-valent iron, DDT, Remediation, Water