关键词: 提金活性炭, 竹节, 水蒸气, 孔隙结构

Abstract:

The preparation of gold extracting activated carbon from bamboo knot by steam was studied．The effect of temperature，holding time and steam flow rate on the property of activated carbon was discussed．The pore structures of the activated carbon were characterized by N₂ adsorption isotherm．The result showed that the adsorption capability of activated carbon increased with the increase of temperature and holding time. The adsorption capability of activated carbon increased to a maximum and then decreased with the steam flow rate increasing. The analysis of N₂ adsorption isotherm showed that the micropore，mesopore and macropore of activated carbon was development．Under optimized experimental condition，the intensity，the adsorption value of methylene blue，iodine，BET，total pore volume，micropore volume of the samples were 97.5%，262 mg·g^-1，1 072.7 mg·g^-1，1 334.2 m²·g^-1，0.671 Ml·g^-1 and 0.574 Ml·g^-1，respectively．

Key words: gold extracting activated carbon, bamboo knot, steam, pore structure