中文摘要：

采用2,2,6,6-四甲基哌啶-1-氧基自由基（TEMPO）选择性催化氧化体系对再生纤维素气凝胶进行表面羧基化改性,制备出羧基化的再生纤维素气凝胶.通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）、紫外光谱和原子吸收等检测手段对不同氧化处理时间的纤维素气凝胶的微观形貌、化学结构和吸附性能进行表征分析,结果表明,随着氧化处理时间的增加,球形再生纤维素气凝胶的羧基含量逐渐增加,结构稳定性逐渐下降,在改性12h时可以获得羧基含量较高（1.25mmol/g）结构相对稳定的产品;TEMPO氧化处理增加了球形气凝胶表面的透过性,并且避免了内部网络因干燥和氢键缔合而产生的聚集;羧基的引入使球形纤维素气凝胶对阳离子染料和部分金属离子的吸附性能得到改善,其中对金胺O的最大吸附量为1.24mmol/g,对金属离子Cu^2＋的最大吸附量为0.55mmol/g.

英文摘要：

2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO)-mediated oxidation system was used for the regen-erated cellulose aerogel’s surface carboxyl modification,and carboxylated regenerated cellulose aerogel was pre-pared.Morphology,chemical structure and adsorption properties characterization of the cellulose aerogels with different oxidation processing time were analyzed by scanning electron microscopy(SEM),Fourier transform in-frared (FT-IR),UV spectroscopy,atomic absorption and so on.The results showed that carboxylate content of the spherical regenerated cellulose aerogels were increased with the increase of oxidation processing time,but their structural stability were decreased,and the product with higher carboxylate content(1.25 mmol/g)and relative stable structure could be obtained within the modification time of 12 h;TEMPO oxidation treatment could increase the permeability of the spherical aerogel surface,and avoid the internal network’s aggregation due to drying and hydrogen bonding;the spherical cellulose aerogels’adsorption properties on cationic dyes and some metal ions were improved because of the introduction of carboxyl,in which the maximum adsorption ca-pacity for auramine O and metal ions Cu2+ respectively were 1.24 and 0.55 mmol/g.