热解活化法制备高吸附性能椰壳活性炭

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

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。

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 m^2/g, with total pore volume of 0.87 cm^3/g, micropore volume of 0.68 cm^3/g, mesopore volume of 0.18 cm^3/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.