两性高分子重金属螯合絮凝剂的合成及其对Cu(Ⅱ)的去除性能  

Synthesis of a heavy metal amphoteric chelating polymer flocculant and its removal perfermance towards Cu( Ⅱ)

作　　者：刘立华[1] 刘星[1] 李艳红[1] 杨刚刚[1] 周智华[1] 徐国荣[1] 

机构地区：[1]湖南科技大学化学化工学院 理论有机化学与功能分子教育部重点实验室 分子构效关系湖南省普通高等学校重点实验室,湘潭411201

出　　处：《环境工程学报》2015年第3期1049-1056,共8页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51078141,51378201);湖南省科技计划项目(2010FJ3030);湖南科技大学研究生创新基金项目(S100123)

摘　　要：合成了一种新型两性高分子重金属螯合絮凝剂聚(氯化二烯丙基甲基羟丙多胺基铵)基二硫代甲酸钠(PDAMHACDTC),采用元素分析、红外光谱、紫外光谱和核磁共振谱对其结构进行表征。考察了其对含Cu2+废水的处理效果,以及絮体的沉降速度;测定了微絮体的ζ电位,采用扫描电镜考察了絮体的形貌。结果表明,当PDAMHACDTC中—CSS-与Cu2+的物质的量之比接近2∶1,对Cu2+的去除率大于99.7%,残余Cu2+浓度远低于国家污水综合排放一级标准0.5 mg/L;在相同—CSS-投加量时,形成的微絮体的ζ电位和絮体沉降速度分别比以聚(二甲基二烯丙基氯化铵-丙烯酰胺)为母体合成的两性高分子螯合絮凝剂(ACPF)形成絮体大,说明PDAMHACDTC比ACPF更利于中和絮体上过剩负电荷,促进絮体的形成和生长。A novel amphoteric chelating polymer flocculant poly( diallyl methyl hydroxypropoxy ammounium chloride)-based dithiocarbamate sodium( PDAMHACDTC) was synthesized and its structure was characterized by elemental analysis,FT-IR,ultravoilet spectroscopy and1H-NMR spectroscopy. The removal efficiency of Cu2 +by PDAMHACDTC and the sedimentation rate of flocs formed were investigated; the zeta potential changes of microflocs were determined,and the images of flocs were investigated by using scanning electron microscope. The results show that when the molar ratio of —CSS-to Cu2 +is near 2∶ 1,the removal rate of Cu2 +is above 99. 7%,and the concentration of residual Cu2 +is far below 0. 5 mg / L of the first grade criteria of China's Integrated Wastewater Discharge Standard. When the dosage of —CSS-is the same,the zeta potential changes of microflocs and the sedimentation rate of flocs formed are higher than those formed by amphoteric chelating polymer flocculant( ACPF) based on poly( dimethyldiallylamonium chloride-acrylamide),respectively,indicating that PDAMHACDTC is more conducive to neuturizing the excess negative charge of flocs,thereby facilitating the formation and growth of flocs.

关 键 词：聚(氯化二烯丙基甲基羟丙多胺基铵)基二硫代甲酸钠 铜离子 螯合 絮凝 去除率 

分 类 号：X703.5[环境科学与工程—环境工程]