纤维素基絮凝材料的制备及其絮凝性能研究

Preparation and flocculation performance of cellulose-based flocculant

以纤维素(Cellulose,CE)为原料,通过氧化接枝聚乙烯(Polyethyleneimine,PEI),制备具有超支化结构的纤维素/聚乙烯亚胺(CE/PEI)材料。研究PEI添加量、反应时间和反应温度等工艺参数对CE/PEI表面氨基含量的影响;进一步以CE/PEI为絮凝材料,考察具有不同氨基含量的CE/PEI对高岭土悬浮液的絮凝效果。实验结果表明:通过调控PEI添加量、反应时间和反应温度可实现CE/PEI表面氨基含量的控制(1.46~3.87mmol/g)。对不同浓度高岭土悬浮液的絮凝试验发现,随着CE/PEI表面氨基含量的增加,其对高岭土的絮凝性能增强;当表面氨基含量最高为3.87mmol/g时,三种浓度下(200、500、800mg/L)高岭土悬浮液浊度分别从180NTU降到22NTU,486NTU降到102NTU,1069NTU降到172NTU,相应去除率分别为87.8%、79.0%和83.9%,表明所制备的CE/PEI材料具有优良的絮凝性能。

Cellulose （CE） was used as a raw material, through the oxidation and grafting, cellulose/polyethyleneimine （CE/PEI） materials with hyperbranched structure. The effect to prepare of process of CE/PEI was studied. Further the CE/PEI as flocculant materials and the flocculation performance of kaolin suspension was investigated by CE/PEI with different amino content. The experiment results showed that the amino content of CE/PEI could be controlled by the amount of PEI, reaction time and reaction temperature （1.46-3.87 retool/g）. The flocculation test for the different concentrationsof kaolin suspension exhibited thatwith the increase of amino groups on the surface of CE/PEI, the flocculation performance of kaolin was enhanced. When the highest surface amino content of CE/PEI was 3.87 retool/g, the turbidity of kaolin suspension at three concentrations （200, 500 and 800 mg/L） respectively decrease from 180 NTU to 22 NTU, 486 NTU to 102 NTU and 1 069 NTU to 172 NTU, accordingly the removal rates