混合有机配位剂对DTSPAM去除水中Cd<sup>2+</sup>性能的影响

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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Cd²⁺性能的影响.结果表明，当含Cd²⁺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Cd²⁺的抑制作用在各个pH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pH值的增加而减弱.当含Cd²⁺水样中共存焦磷酸钠+柠檬酸钠时，其对DTSPAM去除Cd²⁺的影响较为复杂，促进作用或抑制作用与水样初始pH值、DTSPAM投加量等密切相关.当含Cd²⁺水样中共存EDTA+焦磷酸钠+柠檬酸钠时，其对DTSPAM去除Cd²⁺的影响取决于EDTA浓度、DTSPAM投加量和水样初始pH值，在各个pH值下均表现出较强的抑制作用，EDTA在混合体系中对DTSPAM去除Cd²⁺的影响占主导地位.

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	王露露
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关键词 ：高分子絮凝剂, Cd²⁺, 有机配位剂, 配位竞争, 类聚效应

Abstract：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 Cd²⁺ by DTSPAM were studied. The results showed that when EDTA + sodium pyrophosphate or EDTA + sodium citrate coexisted in water samples containing Cd²⁺, 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 Cd²⁺, the effect on the removal of Cd²⁺ 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 Cd²⁺, the effect on the removal of Cd²⁺ 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 Cd²⁺ by DTSPAM was dominant in the mixed system.

Key words： macromolecule flocculant Cd²⁺ organic coordination agent coordination competition symbiosis effect

收稿日期: 2021-08-03

PACS:

X703

基金资助: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）

通讯作者: 王刚,教授,gangw99@mail.lzjtu.cn E-mail: gangw99@mail.lzjtu.cn

作者简介: 王露露(1996-),女,甘肃武威人,兰州交通大学硕士研究生,主要从事水污染控制化学研究.发表论文1篇

引用本文:

王露露, 王刚, 杨丽娟, 周雅琦, 杨凯. 混合有机配位剂对DTSPAM去除水中Cd²⁺性能的影响[J]. 中国环境科学, 2022, 42(3): 1209-1219. WANG Lu-lu, WANG Gang, YANG Li-juan, ZHOU Ya-qi, YANG Kai. Effect of mixed organic coordination agents on the removal performance of Cd²⁺ in water with heavy metal flocculant DTSPAM. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(3): 1209-1219.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2022/V42/I3/1209

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