The present invention provides for a permeable reactive barrier and an effective method of removing contaminants from water using adsorbent powders, such as zero valent iron particles, adhered throughout a reticulated foam structure. This structure provides improved mass transfer, higher reaction rates and reduced residence times. The barrier includes a reticulated foam substrate with high permeability, an adherent coating and a reactive adsorbent arranged in a reticulated foam structure. The substrate can be selected from various materials including polyurethane and polyester. The adherent may be selected from a wide range of materials including polyurethanes, acrylics, silicones, siliconized acrylics, latex emulsions, and other inherently tacky materials that cure to a water resistant coating. The reactive adsorbent can be selected from various adsorbents including a powdered zero-valent iron (ZVI).