Catalytic reduction of trichloroethylene by a new surfactant-stabilized bimetallic nanoscale zero-valent iron from water

Abstract

Highly efficient and versatile reductant surfactant-stabilized bimetallic NZVI was synthesized in the laboratory using various types of surfactants such as cationic, nonionic, anionic surfactants and vitamin B12 and palladium in order to enhance the efficiency of TCE degradation, mobility to the DNAPL zone and accessibility to the DNAPL residual. The surfactant-stabilized bimetallic NZVI was within the size of 1-100 nm in an aqueous surfactant solution (Fig. 1). Each stabilizer and metallic catalyst tremendously enhanced the TCE degradation and TCE reaction rate and kinetics were presented (Fig. 2). A mobility test was conducted for all stabilizers in sand-packed column and the surfactant-stabilized NZVI showed higher mobility and higher accessibility to TCE blobs. These results make colloidal barrier more practical to be applied for in situ conditions.