摘要
采用磷酸法活性炭(PAC)对木糖液进行脱色,研究表明,活性炭对木糖液中的氮类物质、酚类化合物及铁等有良好的去除能力,经活性炭脱色后木糖液颜色变浅,其透光率由28.5%提高到66.4%。活性炭经氨水改性后(PAC-NH3.H2O),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PAC-NH3.H2O的碱性官能团浓度由0.313 5 mmol.g-1增加到0.534 9 mmol.g-1,表面的吸附活性位增多,对木糖液中氮类物质和酚类化合物的吸附量增加。木糖液经PAC-NH3.H2O脱色后,其透光率由28.5%提高到71.4%,与未改性PAC试样相比,透光率提高了5%,其吸附能力有一定程度的提高,是一种可行的活性炭改性方法。
Decoloration of xylose solution by PAC has been studied. The results show that the activated carbon has high decoloration effect on nitrogen compounds, phenolic compounds and iron compounds. After treatment with activated carbon, the color of the xylose solution became lighter and the light transmittance changed from 28.5% to 65%. The amounts of basic groups and active adsorption sites on the surfaces of activated carbon （PAC-NH3·H2 O） increased after modifying with ammonia. Compared to unmodified activated carbon, the adsorption of nitrogen compounds and phenolic compounds also increased, and the light transmittance of decoloried xylose solution changed from 28.5% to 70%, indicating the transmittance increased at 5%. The results suggests that the surface modification by NH3·H2O is a feasible way for the modification of activated carbon.
出处
《福建林学院学报》
CSCD
北大核心
2008年第4期369-373,共5页
Journal of Fujian College of Forestry
基金
国家林业局资助项目([2004]12)
关键词
活性炭
木糖液
脱色
改性
activated carbon
xylose solution
decoloration
modification
