Gaseous Formaldehyde Adsorption Property of Modified Expanded Graphite Based Carbon/Carbon Composite

The expanded graphite based carbon/carbon composite (EGCs) was modified by vacuum impregnation with solutions of hydrogen peroxide, nitric acid, amino acid, ammonium chloride, CTAB. The effects of modifying agent, concentration of modifying agent, modifying time and temperature on gaseous formaldehyde adsorption property of modified EGCs were studied. The results show that gaseous formaldehyde adsorption property of EGCS modified with CTAB was better than that before modification, but it dropped after EGCs was modified with hydrogen peroxide, nitric acid, amino acid, ammonium chloride. When CTAB concentration was 0.01 mol·L-1, modification temperature was 70 ℃, modification time was 60 min, the gaseous formaldehyde adsorption property of modified EGCs was the best, the maximal adsorption capacity of 1 042 mg·g-1.