聚(丙烯酰胺-丙烯酸钠)复合膨润土固定床吸附Pb^(2+)的研究  

Adsorption of Pb^(2+) by fixed bed of poly( acrylamide-co-sodium acrylate) bentonite composite

作　　者：陈学青[1] 赵斌[1] 杜佩衡[1] 曹吉林[1] 

机构地区：[1]河北工业大学化工学院绿色化工与高效节能河北省重点实验室,天津300130

出　　处：《化学工程》2014年第1期24-28,共5页Chemical Engineering(China)

基　　金：天津市科技支撑项目(10ZCKFSH01900);长江学者和创新团队发展计划(IRT1059)

摘　　要：由溶液聚合法制备了聚(丙烯酰胺-丙烯酸钠)复合膨润土吸附剂。聚丙烯酰胺-丙烯酸钠复合膨润土对Pb2+的吸附过程符合Langmuir等温吸附,平衡吸附量为112.74 mg/g。聚丙烯酰胺-丙烯酸钠复合膨润土固定床穿透曲线较好地符合BDST模型,k a=0.300 L/(mg·min),N0=18.644 mg/L,Z0=1.152 cm,对Pb2+的去除率可达到90%。由TPHDM模型得到k f=6.40×10-6m/s,k s=4.31×10-9m/s,D L=3.25×10-8m/s,聚丙烯酰胺-丙烯酸钠复合膨润土固定床吸附Pb2+的传质阻力以轴向扩散控制为主。The poly （acrylamide-co-sodium acrylate） bentonite composites were prepared by solution polymerization. The adsorption of Pb2~ on poly （aerylamide-co-sodium acrylate ） betonite composite conformed to Langmuir isothermal adsorption model, and the adsorption capacity was 112.74 mg/g. The breakthrough curve of adsorption on the fixed bed shows stronger fits to BDST model. The parameters of BDST model are ka =0. 300 L/（ mg · min） , NO = 18. 644 mg/L and Z0 = 1. 152 cm. The removal efficiency of Pb2＋ on fixed bed can reach 90%. The parameters of kf =6.40x 10-6 m/s, ks = 4.31 X 10-9 m/s and DL = 3.25 x 10-8 m/s were obtained by TPHDM model. It was determined that the mass transfer of fixed bed was mainly controlled by axial dispersion.

关 键 词：复合膨润土 丙烯酰胺 丙烯酸钠 固定床 吸附Pb2+ 

分 类 号：TQ424[化学工程]