鸡内金活性炭对酸碱性染料的吸附

Adsorption of Acidic and Basic Dyes by Endothelium Corneum Gigeriae Galli Activated Carbon

以鸡内金(ECGG)为原料,在氩气保护下,先在450℃下高温炭化,后添加KOH作为活化剂,分别选取800、900、1 000℃作为活化温度,制备出3种类型活性炭(ECGG-800、EGGG-900和EGGG-1000).对3种类型活性炭表征分析,并选取ECGG-900做酸性品红和亚甲基蓝的吸附饱和,进行2种最常用的吸附模型Freundlich和Langmuir的拟合.结果表明,用Freundlich吸附等温线模型能解释鸡内金活性炭对酸性染料的吸附;而对于碱性染料的吸附,则Langmuir吸附等温线模型更有说服力;且该活性炭对酸性品红、亚甲基蓝的吸附量分别可达1.682 g/g和2.045 g/g.随着吸附时间的延长,3种活性炭对染料的去除率也随即增大.鸡内金活性炭对处理酸性和碱性染料效果均佳,是一种具有发展潜力的吸附剂.

Activated carbon was prepared from endothelium corneum gigeriae galli （ECGG） by preliminary carbonization at 450 and final KOH activation at high temperatures （ECGG-800 ℃, ECGG-900℃ and ECGG-1 000 ℃ ）. The surface and structural properties were analyzed with SEM and BET. And then selected ECGG-900 to draw its adsorption isotherms for acidic and basic dyes, the adsorption isotherm data were fitted by the two most used models, the Freundlich and Langmuir models. Results show that adsorption isotherm to acid fuchsin is best fitted with Freundlich model, while to methylene blue is more accord with Langmuir model. The adsorption capacity of acid fuchsin and methylene blue reached 1. 682 g/g, 2. 045 g/g. As the adsorption time sessions, the removal rates of three kinds of activated carbon for dyes also immediately increased. The results indicated that the Endothelium corneum gigeriae galli activated carbon is effective for removing the acid fuchsin and methylene blue in the water solution and is a potent adsorbent.