改性膨胀石墨基炭/炭复合材料对甲醛气体的吸附性能

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

摘要: 对膨胀石墨基炭/炭复合材料(EGCs)进行真空浸渍改性, 研究了改性剂种类(双氧水、硝酸、氨基酸、氯化铵、CTAB), 改性剂浓度、改性温度、改性时间对EGCs甲醛吸附性能的影响。结果表明: 经CTAB溶液改性后, EGCs对甲醛气体的吸附性能得到提高, 而经双氧水、硝酸、氨基酸、氯化铵等溶液改性的EGCs对甲醛气体的吸附能力反而下降; 当CTAB浓度为0.01 mol·L-1、改性温度为70 ℃、改性时间为60 min时, 改性后EGCs对甲醛的吸附效果最好, 最大吸附量可达1 042 mg·g-1。

Abstract: 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.