【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。更多还原

【Abstract】 The poly( acrylamide-co-sodium acrylate) bentonite composites were prepared by solution polymerization. The adsorption of Pb2 +on poly( acrylamide-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 k a = 0. 300 L /( mg·min), N 0 = 18. 644 mg / L and Z 0 = 1. 152 cm. The removal efficiency of Pb2 +on fixed bed can reach 90%. The parameters of k f = 6. 40 × 10- 6m / s,k s = 4. 31 × 10- 9m / s and D L = 3. 25 × 10- 8m / s were obtained by TPHDM model. It was determined that the mass transfer of fixed bed was mainly controlled by axial dispersion.更多还原