为了有效去除造纸白水中的阴离子垃圾，提高造纸白水的回用性。本文首先制备了壳聚糖微球，并利用戊二醛进行改性，对壳聚糖微球及其改性物吸附聚半乳糖醛酸的初步条件进行了研究比较。结果表明戊二醛与壳聚糖微球的交联反应很好地符合准二级动力学过程及Freundlich吸附等温方程。随着聚半乳糖醛酸溶液pH值的增大，壳聚糖微球及其改性物对聚半乳糖醛酸的吸附量先逐渐减小后增大，但在同一pH值下，改性壳聚糖微球的吸附量比壳聚糖微球的大。另外，随着氯化钠浓度的逐渐增加，壳聚糖微球及其改性物对聚半乳糖醛酸的吸附量迅速降低，但在同一氯化钠浓度下，改性壳聚糖微球的吸附量比壳聚糖微球的稍大。

In order to remove anionic trash in whitewater effectively to improve the recycling of paper-making whitewater. In this paper, chitosan microsphere was prepared, and modified with glutaraldehyde, then the adsorption of chitosan microsphere and its modifier for poly-galacturonic acid were studied. The results showed that the cross-linking of chitosan microsphere and glutaraldehyde followed the pseudo-second-order equation and Freundlich equation. As the pH of poly-galacturonic acid solution increased, the adsorption quantity of chitosan microsphere and its modifier for poly-galacturonic acid gradually decreased first and then increased, but at the same pH, the adsorption quantity of modified chitosan microsphere for poly-galacturonic acid was larger than that of chitosan microsphere. In addition, with the gradual increase in concentration of sodium chloride, the adsorption quantity of chitosan microsphere and its modifier for poly-galacturonic acid rapidly decreased, but at the same concentration of sodium chloride, the adsorption quantity of modified chitosan microsphere for poly-galacturonic acid was slightly larger than that of chitosan microsphere.