Nanoporous copper (NPC) with a controllable ligament width was prepared by chemically dealloying Cu_(45)Al_(45)Ti_(10) amorphous ribbons in dilute HCI solution. X-ray diffraction and scanning electron microscopy analysis confirmed the 3D, bicontinuous, nanoporous structure constituting fcc-Cu ligaments of 39-79 nm thickness. The coarsening of NPC ligaments increased significantly with an increase of HCl concentration, reaction temperature or time. The surface diffusivity and activation energy of NPC were also calculated. Finally, the catalytic activity of NPC was validated with the ultrasound and H_2O_2-assisted degradation of methyl orange (MO), where 99 MO was degraded within 15 min.
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