Simultaneous adsorption and degradation of γ-HCH by nZVI/Cu bimetallic nanoparticles with activated carbon support

► Deposition of Cu on the surface of Fe enhances its dechlorination efficiency toward γ-HCH. ► Incorporation of the bimetallic nanoparticles with activated carbon (AC) reduces their agglomeration. ► AC support increases the contact of γ-HCH with the nanoparticles and enhances the degradation efficiency. ► The AC support adsorbs γ-HCH and its degradation products, reducing their ecological risks in water.