Study and Application of Nitric-Acid-Modified Activated Carbon Fiber on Nitrogen Oxide Adsorption Performance

Nitrogen oxides are a kind of atmospheric pollutants that cause great harm to the environment and human body. The modified activated carbon fiber (ACF) has good adsorption performance for nitrogen oxides. The ACF was modified by nitric acid. The results of ACF modification were verified and evaluated by chemical and physical characterization of the materials. In the laboratory stage, the initial concentration of pollutants, the wind speed, the number of loading materials, and the number of regeneration times were used to explore the influence of modified ACF adsorption, and the change rule and the cause were analyzed. After procedures were carried out to study the adsorption of industrial exhaust gas, the concentration of nitrogen oxides before and after the modified ACF filter adsorption core was measured. The actual effect of industrial exhaust gas adsorption partially deviated from that of the laboratory. The results showed that the adsorption effect of nitric oxide increased with the increase in regeneration times, while the adsorption amount of nitric oxide by modified ACF in the laboratory stage gradually decreased with the increase in regeneration times.