摘要
以聚丙烯酰胺、甲醛、亚硫酸氢钠、二硫化碳、氢氧化钠为原料制备重金属絮凝剂二硫代羧基化磺甲基聚丙烯酰胺(DTSPAM),考察了共存多种有机配位剂(EDTA+焦磷酸钠、EDTA+柠檬酸钠、焦磷酸钠+柠檬酸钠、EDTA+焦磷酸钠+柠檬酸钠)对DTSPAM去除Cd^(2+)性能的影响.结果表明,当含Cd^(2+)水样中共存EDTA+焦磷酸钠或EDTA+柠檬酸钠时,EDTA的存在对DTSPAM去除Cd^(2+)的抑制作用在各个p H值条件下均较焦磷酸钠或柠檬酸钠的影响强,且该抑制作用随着EDTA浓度的增加而增强、随着体系初始p H值的增加而减弱.当含Cd^(2+)水样中共存焦磷酸钠+柠檬酸钠时,其对DTSPAM去除Cd^(2+)的影响较为复杂,促进作用或抑制作用与水样初始p H值、DTSPAM投加量等密切相关.当含Cd^(2+)水样中共存EDTA+焦磷酸钠+柠檬酸钠时,其对DTSPAM去除Cd^(2+)的影响取决于EDTA浓度、DTSPAM投加量和水样初始p H值,在各个p H值下均表现出较强的抑制作用,EDTA在混合体系中对DTSPAM去除Cd^(2+)的影响占主导地位.
Polyacrylamide, formaldehyde, sodium bisulfite, carbon disulfide, and sodium hydroxide were used as raw materials to prepare a novel heavy metals flocculant, named dithiocarboxyl sulfomethy-polyacrylamide(DTSPAM). The effect of coexisting organic complexing agent(EDTA + sodium pyrophosphate, EDTA + sodium citrate, sodium pyrophosphate + sodium citrate, and EDTA + sodium pyrophosphate + sodium citrate) on the removal of Cd^(2+)by DTSPAM were studied. The results showed that when EDTA + sodium pyrophosphate or EDTA + sodium citrate coexisted in water samples containing Cd^(2+), the inhibition of EDTA on the removal of Cd2;was stronger than that of sodium pyrophosphate or sodium citrate at all pH values, and the inhibition increased with the increase of EDTA concentration and decreased with the increase of initial pH value. When sodium pyrophosphate and sodium citrate coexisted in water samples containing Cd^(2+), the effect on the removal of Cd^(2+)by DTSPAM was more complex, and the promoting or inhibiting effect was closely related to the initial pH value of water samples and the dosage of DTSPAM. When EDTA + sodium pyrophosphate + sodium citrate coexisted in the water sample containing Cd^(2+), the effect on the removal of Cd^(2+)by DTSPAM depended on the concentration of EDTA, the dosage of DTSPAM and the initial pH value of the water samples. EDTA had a strong inhibition at each pH value, and the effect of EDTA on the removal of Cd^(2+)by DTSPAM was dominant in the mixed system.
作者
王露露
王刚
杨丽娟
周雅琦
杨凯
WANG Lu-lu;WANG Gang;YANG Li-juan;ZHOU Ya-qi;YANG Kai(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2022年第3期1209-1219,共11页
China Environmental Science
基金
国家自然科学基金资助项目(51368030)
兰州交通大学天佑创新团队基金资助项目(TY202005)。
关键词
高分子絮凝剂
Cd^(2+)有机配位剂
配位竞争
类聚效应
macromolecule flocculant
Cd^(2+)
organic coordination agent
coordination competition
symbiosis effect
