活性炭微结构对木糖醇溶液脱色性能的影响

Influence of Activated Carbon Microstructure on Decoloration Performance of Xylitol Solution

通过对4种木屑活性炭样品的吸附性能测定和微结构表征,表明活性炭对木糖醇溶液的脱色效果与亚甲基蓝吸附能力的大小密切相关,但亚甲基蓝吸附值不是决定活性炭对木糖醇溶液中色素杂质吸附的唯一因素。中孔的数量是影响活性炭对木糖醇溶液中色素杂质吸附的重要因素,尤其是尺寸为2～14 nm的中孔的数量对木糖醇溶液中色素杂质吸附的影响比较大。红外光谱分析显示表面官能团C—O的存在会促进活性炭对木糖醇溶液中色素杂质的吸附。

Adsorption performance and microstructure were studied using four different sawdust activated carbons.It was indicated that the adsorption value of methyleneblue had great effect on the activity of activated carbons for decoloring xylitol solution.However,it was not the only factor.The number of activated carbons′ mesopores,especially the size range of 2-14 nm,impacted greatly the decoloration performance of xylitol solution.The FT-IR analyses of the activated carbons showed that the presence of surface C—O functionality might promote the adsorption.