壳聚糖丙烯酰胺接枝共聚物的制备及其与Fenton氧化法联合处理麦草浆中段废水

以硝酸铈铵为引发剂,合成了壳聚糖丙烯酰胺接枝共聚物（CAM）;结果表明,当m（丙烯酰胺）∶m（壳聚糖）=3∶1,c（硝酸铈铵）=3 mmol/L,反应温度为60℃时,合成的CAM接枝率达到239.4%,单体转化率达到79.83%;将其与Fenton试剂联用,可处理麦草浆中段废水。Fenton氧化预处理的最佳工艺为：ρ（H2O2）=2 g/L,m（H2O2）∶m（FeSO4）=2∶1,pH=4,处理时间为60 m in。絮凝阶段处理的最佳工艺为：ρ（CAM）=10 mg/L,在此条件下,处理后麦草浆中段废水CODCr去除率达82.38%,浊度去除率达到98.53%。

Preparation of Chitosan-acrylamide Graft Copolymer and Its Application in Treatment of Combined Effluents from Washing/Screening/Bleaching of Wheat-straw Pulp Allied with Fenton Oxidation Technology

The graft copolymer of chitosan and acrylamide（CAM） was prepared using ceric ammonium nitrate as initiator. A 239.4% of grafting percentages and 79.83% of monomer conversion were achieved when re（AM） ： m （chitosan） was 3 ： 1, initiator concentration was 3 mmol/L and reaction temperature was 60 ℃. The copolymer was used to flocculate the combined effluents from washing/screening/bleaching of wheat-straw pulp after they were pre-treated by Fenton oxidation technology. The optimal operating conditions for the pre-treatment was ：ρ （H2O2 ） = 2 g/L and m （H2 O2 ） ： m （FeSO4 ） = 2 ： 1 while pH = 4 and t = 60 min. The optimum charge of the copolymer for the flocculation was 10 mg/L. The COD Cr and turbidity removal rates were up to 82.38% and 98, 53% , respectively.