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Zero-valent metals such as bulk iron and zinc are known to dechlorinate toxic organic compounds. Enhancement in reaction rates has been achieved through bimetallic nanosized particles such as nickel/iron (Ni/Fe) and palladium/iron (Pd/Fe). Batch degradation of model compounds, trichlroethylene (TCE) and 2,2’-dichlorobiphenyls (DCB), were conducted using bimetallic Ni/Fe and Pd/Fe nanoparticles. Complete degradation of TCE and DCB is achieved at room temperature. Zero-valent iron, as the major element, undergoes corrosion to provide hydrogen and electrons for the reductive catalytic hydrodechlorination reaction. The second dopant metals of nickel and palladium (in nanoscale) act as catalyst for hydrogenation through metal hydride formation that produces completely dechlorinated final product. Different compositions of bimetallic Ni/Fe and Pd/Fe nanoparticles were synthesized and their reactivity was characterized in terms of reaction rate constants, hydrogen generation through iron corrosion, and products formation. The observed TCE degradation rate constant was two orders of magnitude higher than the bulk iron and nanoiron, indicating that the bimetallic nanoparticles are better materials compared to the monometallic iron systems. Longevit