Modification of Heterogeneous Catalyst Support with Hydrogen Peroxide and Its Application in the Degradation of Methylene Blue Wastewater.

Abstract

This work focuses on the green modification of heterogeneous catalyst supports. To carry out the modification, a 30 wt % hydrogen peroxide (H₂O₂) solution was used, and two catalysts, Cu/H₂O₂-Boehmite (modified with H₂O₂ solution) and Cu/Boehmite (unmodified with H₂O₂ solution), were prepared. And then, the prepared catalysts were characterized by the X-ray powder diffraction technique, N₂ adsorption-desorption experiments, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and contact angle measurements. Meanwhile, the catalytic activities of the catalysts were investigated by the degradation of methylene blue (MB) wastewater. The results show that compared with Cu/Boehmite, the active Cu species on the surface of the Cu/H₂O₂-Boehmite catalyst exhibit better dispersion, a larger BET surface area and pore volume, and significantly enhanced hydrophilicity. The catalytic activity tests showed that the Cu/H₂O₂-Boehmite catalyst exhibited superior performance in the degradation of MB wastewater compared to the Cu/Boehmite catalyst, and the corresponding chemical oxygen demand removal rate reached 63% within 60 min in this study. Therefore, for catalysts with the same content of active components, modifying the support with a H₂O₂ solution is conducive to enhancing the catalytic activity.