BLAMA复合吸附树脂制备与吸附性能

摘要

Bentonite/sodium lignosulfonate graft acrylamide and maleic anhydride adsorption resin composites (BLAMA)was prepared by solution polymerization using sodium lignosulfonate (LS-Na),acrylamide (AM) and maleic anhydride (MAH)as raw materials,bentonite as inorganic filler,potassium peroxydisulfate (KPS) as initiator,N,N-methylene-bis-acrylamide (NMBA)as crosslinker.Based on the assessment of the adsorption capacity of Pb2+ and the selectivity of Pb2+ to Cu2+ in the Pb2+/Cu2+ binary metal ion solution,the preferable formula was obtained as follow:m(LS-Na)∶ m(Mtotal)=1∶7,m(AM)∶ m(MAH)=1∶1,m(KPS)=0.7%,m(NMBA)= 0.3%(the mass of both KPS and NMBA was based on total mass of monomer,Mtotal), pH value =4.And in this condition,BLAMA had a higher adsorption capacity and its maximum value of Pb2+adsorption was 0.471 mmol/g,and the adsorption selectivity of Pb2+ to Cu2+ was 3.6∶1(mole ratio)in the Pb2+/Cu2+ binary metal ion solution.%以木质素磺酸钠(LS-Na)、丙烯酰胺(AM)、马来酸酐(MAH)为原料,膨润土(Bentonite)为无机添加剂,过硫酸钾(KPS)为引发剂,N,N-亚甲基双丙烯酰胺(NMBA)为交联剂,通过溶液聚合法制备了膨润土/木质素磺酸钠接枝丙烯酰胺-马来酸酐复合吸附树脂(BLAMA)。以二元Pb2+/Cu2+溶液中对Pb2+的吸附量及其吸附选择性为参考指标,得到实验范围内的较优配方为m(LS-Na)∶m(Mtotal)=1∶7,m(AM)∶m(MAH)=1∶1,m(KPS)=0.7%,m(NMBA)=0.3%(KPS和NMBA的质量均相对于单体总质量Mtotal ),p H 值=4。此时所得树脂吸附性能较好,在二元 Pb2+/Cu2+溶液中 Pb2+最大吸附量为0.471 mmol/g,Pb2+对Cu2+的吸附选择性摩尔比为3.6∶1。