MBFX-8/磁性Fe3O4@CMC复合絮凝剂的制备及对Cu^2＋的去除  

Fabrication of MBFX-8/magnetic Fe_3O_4@CMC composite flocculant and its removal towards Cu^(2+)

作　　者：郭振华[1] 刘中桃 沈伯雄[1] 马影利 孙境求[2] 

机构地区：[1]河北工业大学能源与环境工程学院,天津300401 [2]中国科学院生态环境研究中心,中国科学院饮用水科学与技术重点实验室,北京100085

出　　处：《环境工程学报》2018年第2期421-426,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51541602)

摘　　要：以微生物絮凝剂MBFX-8、羧甲基壳聚糖CMC和磁性Fe_3O_4为原料,制备了新型MBFX-8/磁性Fe_3O_4@CMC复合絮凝剂。采用FTIR和XRD对新型复合絮凝剂进行表征。结果表明,羧甲基壳聚糖(CMC)已成功接枝在Fe_3O_4纳米粒子表面,而且MBFX-8也顺利掺入复合絮凝剂中。考察了MBFX-8与Fe_3O_4@CMC的质量比、p H、絮凝剂投加量和静置反应时间对Cu^(2+)去除性能的影响。MBFX-8与Fe_3O_4@CMC的质量比为1∶5时,复合絮凝剂对Cu^(2+)的去除率最好。复合絮凝剂对Cu^(2+)的去除效果与溶液初始p H以及静置反应时间正相关,而与其投加量的增加呈先提高后降低的趋势。当溶液初始p H值为6.5,复合絮凝剂投加量为5 g·L-1,静置反应时间为3 h时,得到最优的Cu^(2+)去除效果,达98.9%。A novel MBFX-8/magnetic Fe3O4@CMC composite flocculant was fabricated by microbial flocculant MBFX-8,carboxymethyl chitosan（CMC） and magnetic Fe3O4.The composite flocculant was characterized by FTIR and XRD.The results indicated that CMC was successfully grafted on the surface of Fe3O4 nanoparticles.We have investigated the influence of mass ratio between MBFX-8 and Fe3O4@CMC,initial p H,flocculant dosage and reaction time on the removal of Cu^2＋ ions.Highest removal rate of Cu^2＋ was achieved at the mass ratio of 1 ∶ 5 between MBFX-8 and [e-mail] removal rate of Cu^2＋ was positively correlated with initial p H and reaction time.But the removal rate of Cu^2＋ increased first and then decreased with the increase of flocculant dosage.The optimized removal rate of Cu^2＋ reached to 98.9% when the initial p H was 6.5,flocculant dosage was 5 g·L^-1,and reaction time was 3 h.

关 键 词：微生物絮凝剂MBFX-8 羧甲基壳聚糖(CMC) MBFX-8/磁性Fe3O4@CMC复合絮凝剂 二价铜离子(Cu2+) 

分 类 号：X703.1[环境科学与工程—环境工程]