KOH改性活性炭对木糖液脱色性能的研究

Studies on Decoloration of Xylose Solution by KOH-Modified Activated Carbon

以KOH溶液为改性试剂对磷酸法活性炭(PAC)进行改性,并对木糖液进行脱色。研究表明:以质量分数0.25%KOH溶液对活性炭进行4～6h的处理,可以提高活性炭对木糖液的脱色率,与未改性PAC试样相比,其透光率由44%提高到50%。并且对木糖液中的酚类化合物、氮类物质、铁及糠醛的去除率由46.37%、43.50%、6.40%、11.83%提高到56.87%、53.00%、16.31%、13.17%。活性炭经KOH溶液改性后(KOH-PAC),其表面化学发生了一定的变化,与未改性的PAC试样相比,试样KOH-PAC的碱性官能团数量增加,表面的吸附活性位增多。其吸附能力有一定程度的提高,是一种可行的改性方法。

Decoloration of xylose solution by K show that activated carbon treated by 0.25% KOH compounds, nitrogen-- containing material, furfura of 31 above compounds respectively changed from 46. OH modified-activated carbon was studied. The results for 4-6 h has higher decoloration efficiency on phenolic 1 and iron compounds. After treatment, the removal rate 37%,43.5%,6.4% and 11.83% to 56.87%、40.53%.16. % and 13.17%, and the light transmittance of the X The amounts of basic groups and adsorbent active sites creased after KOH treatment, showing that this is a fe carbon. ylose solution has been changed from 44% to 50 %. on the surface of activated carbon （KOH--PAC） inasible way for improving the adsorability of activated carbon.