关键词: 竹炭, 微波辐射, 吸附性能, 比表面积

Abstract: The preparation of activated carbon from bamboo charcoal by fast pyrolysis using KOH-microwave irradiation method was researched. The effects of different conditions on the properties of bamboo-based activated carbon were systematically studied via orthogonal experiments. The optimum conditions were as follows: mass fraction of KOH solution 25%, impregnating time 24h, microwave power 800W and activating time 7min. Under the above conditions, iodine adsorption value of activated carbon was 1239.08mg/g, methylene blue adsorption value was 274.95mg/g, which was 2.04 times of the level specified for the first grade in GB/T 13803.2-1999 standard, and specific surface area was 1394.16m²/g. Meanwhile, FT-IR spectra of bamboo charcoal before/after activating were tested. The results showed that surface structure of bamboo charcoal was modified greatly after activation, more surface chemical functional groups were created and specific surface area and adsorption properties of bamboo charcoal were also raised.

Key words: bamboo charcoal, microwave irradiation, adsorption properties, specific surface area