利用基于 pH 值反转的落球法制备出不同质量分数的纤维素和海藻酸钠复合水凝胶球,并采用扫描电子显微镜(SEM)和傅里叶变换红外光谱(FT-IR)对凝胶样品的形貌和化学态进行表征.结果表明海藻酸钠含量≤50％时凝胶球可以保持稳定的球形结构,内部为纤维链交叉聚集的三维网络多孔结构.复合凝胶球对亚甲基蓝、金胺 O 和臧红T 等阳离子染料有着良好的吸附效果,含有50％海藻酸钠凝胶球对亚甲基蓝的吸附量为163．36 mg/g,吸附过程满足准二阶动力学方程,经过5次吸附脱附实验后仍然保持初始81％的吸附量.因此,该复合凝胶球可以作为一种低成本的生物吸附剂用于染料处理领域.
Different mass fraction of sodium alginate/cellulose hydrogel beads were prepared by the falling ball method based on reversal pH and characterized by scanning electron microscopy (SEM)and fourier transform infrared spectroscopy (FT-IR).The results showed that sodium alginate/cellulose hydrogel beads including less than or equal to 50% sodium alginate(mass fraction)can keep a stable spherical structure with 3D network por-ous structure and have a good adsorption performance of cationic dyes (methylene blue,auramine O and safra-nine T).The adsorption capacity of methylene blue on the hydrogel beads containing 50% sodium alginate(mass fraction)was 163.36 mg/g.The adsorption was well described by pseudo-second-order kinetics and they still keep the initial 81% adsorption capacity after five times adsorption-desorption experiment.Therefore,the com-pound hydrogel beads could be employed as a low-cost alternative to other adsorbents in the removal of dyes from aqueous solution.
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