In this study, activated carbon was modified through a two-stage method. The first step is to use nitric acid to pretreat the surface of the activated carbon to contain oxygen functional groups to change its pore structure and chemical properties; secondly, add metal oxide nanoparticles to increase the surface area of the activated carbon to capture more of formaldehyde or degradation. In the experiment, silver nanoparticles and copper nanoparticles were selected to be coated and dispersed in activated carbon, which can more efficiently remove low-concentration formaldehyde. In the experiment, silver nanoparticles and copper nanoparticles were selected to be coated and dispersed in activated carbon, which can more efficiently remove low-concentration formaldehyde.
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