热解活化法制备高吸附性能椰壳活性炭

以椰壳为原料,采用高温直接热解活化法制备高吸附性能活性炭。研究了活化温度、活化时间对活性炭吸附性能的影响。研究结果表明,活化温度为 900 ℃,热解活化时间为 8 h,升温速率为 10 ℃/min,制得碘吸附值为 1 628.54 mg/g,亚甲基蓝吸附值为 375 mg/g 的高吸附性能椰壳活性炭,得率为 9.41 %。氮气吸附实验结果表明,该活性炭比表面积 1 723 m²/g、总孔容积 0.87 cm³/g、微孔容积 0.68 cm³/g、中孔容积0.18 cm³/g、平均孔径 2.03 nm。热解活化制备的椰壳活性炭样品性能优于市售水蒸气法椰壳净水活性炭国家标准。

Preparation of Activated Carbon with High Adsorption Properties from Coconut Shell by Pyrolysis and Activation

Activated carbon with high adsorption properties were prepared from coconut shell by pyrolysis and activation.The effects of activation temperature and time on adsorption properties of activated carbons were investigated.The results show that under the condition of activation temperature at 900 ℃ for 8 hours with the heating rate 10 ℃/min,the prepared carbon has the iodine adsorption of 1 628.54 mg/g and methylene blue adsorption of 375 mg/g,and the yield is 9.41%.The results of N2 adsorption show that its surface area is 1 723 m2/g,with total pore volume of 0.87 cm3/g,micropore volume of 0.68 cm3/g,mesopore volume of 0.18 cm3/g,and the average pore size of the activated carbon is about 2.03 nm.The properties of the activated carbon from coconut shell by pyrolysis and activation are superior to that of water purification and monosodium glutamate decolorization activated carbon in national standard.