新型聚两性电解质污水处理剂的制备  

Preparation of novel polyampholyte water treatment agent

作　　者：綦峥[1] 祁佩时[1] 杨巍[2] 

机构地区：[1]城市水资源与水环境国家重点实验室,哈尔滨工业大学,黑龙江哈尔滨150090 [2]黑龙江大学化学化工与材料学院,黑龙江哈尔滨150080

出　　处：《化工学报》2009年第8期2095-2100,共6页CIESC Journal

基　　金：国家科技支撑计划项目(2006BAC19B04)~~

摘　　要：Mg3Al layered double hydroxides (Mg3Al-LDHEPCL) was grafted through free radical polymerization using S2O2-8/S2O2-5 redox initiator.Monomers used for the graft copolymerization were composed of anionic monomers acrylic acid (AA) and sodium acrylate (SA) as well as cationic monomers trimethylallyl ammonium chloride (TMAAC) and dimethyldiallyl ammonium chloride (DMDAAC).The produced hybrid graft copolymer,Mg3Al-LDHEPCL-g-PAA-PSA-co-PTMAAC-co-PDMDAAC,can be used as polyampholyte sewage treatment agent.The graft copolymerization process was monitored by differential scanning calorimetry (DSC) to obtain the kinetic characteristics in the foamed dispersion polymerization system.The graft copolymerization composition was optimized aiming to achieve lower water content in the sludge and lower COD value in the filtrate.The optimized composition was found to be m(Mg3Al-LDHEPCL )∶m(AA+SA+TMAAC+DMDAAC)=0.12∶1;m(TMAAC+DMDAAC)∶m(AA+SA+TMAAC+DMDAAC)=0.288∶0.712,and the neutralization ratio of AA was 18%—24%.Hydrolysis analog studies in 1.0 mol·L-1 NaOH solution revealed that the layered cluster of Mg3Al-LDHEPCL hydrolyzed into multiple lamellar segments forming a secondary quaternary ammonium polyampholyte that functioned as coagulation agent.These inherent structural characteristics are important factors for improving the dehydration effect significantly.The crystal structures were characterized by XRD and IR.Mg3Al layered double hydroxides （Mg3Al -LDHEPcL） was grafted through free radical polymerization using S2O8^2-/S2O5^2- redox initiator. Monomers used for the graft copolyrnerization were composed of anionic monomers acrylic acid （AA） and sodium acrylate （SA） as well as cationic monomers trimethylallyl ammonium chloride （TMAAC） and dimethyldiallyl ammonium chloride （DMDAAC） . The produced hybrid graft copolymer, Mg3Al -LDHEPCL-g-PAA-PSA-co-PTMAAC-co-PDMDAAC, can be used as polyampholyte sewage treatment agent. The graft copolymerization process was monitored by differential scanning calorimetry （DSC） to obtain the kinetic characteristics in the foamed dispersion polymerization system. The graft copolymerization composition was optimized aiming to achieve lower water content in the sludge and lower COD value in the filtrate. The optimized composition was found to be m（ Mg3Al -LDHEPCL） ： m（AA＋SA＋TMAAC＋DMDAAC） =0.12 ： 1; m（TMAAC＋DMDAAC） ： m（AA＋SA＋TMAAC＋DMDAAC） =0. 288 ： 0. 712, and the neutralization ratio of AA was 18%-- 24%. Hydrolysis analog studies in 1.0 mol · L^-1 NaOH solution revealed that the layered cluster of MgaA1-LDHEPCL hydrolyzed into multiple lamellar segments forming a secondary quaternary ammonium polyampholyte that functioned as coagulation agent. These inherent structural characteristics are important factors for improving the dehydration effect significantly. The crystal structures were characterized by XRD and IR.

关 键 词：水滑石层片 接枝聚合 无机-有机杂化聚两性电解质 泡沫分散体系 

分 类 号：TQ031.2[化学工程]