摘要
采用2种具有不同骨架和功能基团的树脂XAD4和XAD-7研究它们对水溶液中丹宁酸和没食子酸的吸附行为和机理。研究表明,XAD-7树脂吸附这2种酸的能力都强于XAD4树脂,这主要是因为2种树脂的孔径分布有所不同,而且XAD-7表面含氧功能基团起到了主要作用。2种树脂的吸附等温线可以用传统的Freundlich方程进行拟合。拟合结果表明,2种树脂对丹宁酸的吸附能力都强于没食子酸,这主要是由于2种吸附质的分子结构决定的。动态柱吸附过程的研究也表明,XAD-7树脂具有良好的吸附稳定性。
In this paper, two different polymers XAD-4 and XAD-7 were used to investigate adsorption behavior and mechanism against two adsorbate gallic and tannic acids. The capacity of the resin XAD-7 resin to adsorb gallic and tannic acids are higher than the other resin XAD-4, which has been explained on the basis of both pore size distribution and chemical function groups. The isotherm data for the two resins in adsorption of tannic and gallic acids can be well fitted by Freundlich equation, and the equilibrium adsorption capacities of tannic acid is obviously higher than gallic acid. Furthermore dynamic column adsorption was conducted to observe the better adsorption capacities in XAD-7.
出处
《实验室研究与探索》
CAS
北大核心
2010年第11期190-192,共3页
Research and Exploration In Laboratory
关键词
可溶性有机污染物
去除机理
丹宁酸
没食子酸
dissolved organic matter（DOM）
removal mechanism
tannic acid
gallic acid
