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利用互花米草茎秆为原料,以H3PO4为活化剂,在不同的活化温度(400℃—700℃)和不同的浸渍比(0.5—3.0)条件下制备活性炭.以高纯氮(N2/77.4K)吸附测定活性炭的比表面积和孔容、孔径分布,以FTIR、零点电荷pHPZC测定活性炭表面官能团的变化,并考察了活化温度及浸渍比对活性炭成品性能的影响.结果表明,浸渍比对活性炭的孔结构属性有着重要的影响,随着浸渍比的增大,活性炭孔径分布变宽,磷酸活化法制备的活性炭主要为中孔分布;较低活化温度有利于活性炭比表面积的增加,浸渍比为1.0,活化温度为400℃时,BET比表面积达到1339.75 m.2g-1,随着活化温度的升高,活化温度为700℃时,BET比表面积降为1100.72 m.2g-1.可以通过控制浸渍比及活化温度来调节活性炭表面化学性质.该活性炭制备方法为互花米草的综合利用找到了新的途径.
Activated carbon was prepared from Spartina alterniflora stalk with H3PO4 as activator at different activation temperature (400-700 ℃) and different impregnation ratio (0.5-3.0) 77.4K) was used to determine the specific surface area, pore volume and pore size distribution of activated carbon. The functional groups on the surface of activated carbon were measured by FTIR and zero-charge pHPZC. The effects of activation temperature and impregnation ratio on the properties of activated carbon were investigated. The pore structure of activated carbon has an important influence. With the increase of impregnation ratio, the pore size distribution of activated carbon becomes wider. The activated carbon prepared by phosphoric acid activation method is mainly mesopore distribution. The lower activation temperature is beneficial to the increase of specific surface area of activated carbon. Was 1.0, and the activation temperature was 400 ℃, the BET specific surface area reached 1339.75 m.2g-1, with the activation temperature being 700 ℃, the BET specific surface area was reduced to 1100.72 m.2g-1, Control the impregnation ratio and activation temperature to adjust the surface chemical properties of activated carbon.The preparation method of activated carbon found a new way for the comprehensive utilization of Spartina alterniflora.