超低温预处理对椰壳基活性炭物理特性的影响

为提高活性炭的吸附性能并降低制备工艺能耗，研究超低温预处理对活性炭品质及其制备工艺的影响，采用液氮对椰壳进行了超低温预处理。通过快速升温活化，在600 ℃下即制得比表面积超过无预处理800 ℃下制得的活性炭，比表面积由1600 m2/g增大至2300 m2/g以上，微孔总体积也由0.67 cm3/g增加至0.92 cm3/g。结果表明，超低温预处理方式对提高活性炭品质和降低工艺能耗都有显著的促进作用，该研究为活性炭功能性开发和表面结构改良研究提供了参考依据。

Impact of ultra low temperature pretreatment on physical properties of cocoanut activated carbon

To enhance absorption property of activated carbon and reduce energy consumption of preparation technology, we address the impact of ultra low temperature pretreatment on quality and preparation technology of activated carbon. We employ liquid nitrogen to pretreat coconut shell at ultra low temperature. Through rapid temperature rise, we prepare activated carbon at 600 ℃ whose specific surface area surpasses that of non pretreatment activated carbon at 800 ℃. The specific surface area of activated carbon of the coconut shell increases to 2300 m2/g from 1 600 m2/g, and its micropore volume increases to 0.92 cm3/g from 0.67 cm3/g. Results show that ultra low temperature pretreatment has significant positive effect to quality improvement and reduction of energy consumption of activated carbon. The research provides reference for functional development and the improvement of surface structure of activated carbon.