袁海飞,王刚,徐敏,未碧贵,常青.重金属絮凝剂DTMPAM去除水中Cu2+和EDTA-Cu的性能[J].环境科学学报,2019,39(12):3985-3993
重金属絮凝剂DTMPAM去除水中Cu2+和EDTA-Cu的性能
- The performance of Cu2+ and EDTA-Cu removal in aqueous solutions with heavy metal flocculant DTMPAM
- 基金项目：国家自然科学基金（No.51368030）
- 袁海飞
- 兰州交通大学环境与市政工程学院, 兰州 730070
- 王刚
- 兰州交通大学环境与市政工程学院, 兰州 730070
- 徐敏
- 兰州交通大学环境与市政工程学院, 兰州 730070
- 未碧贵
- 兰州交通大学环境与市政工程学院, 兰州 730070
- 常青
- 兰州交通大学环境与市政工程学院, 兰州 730070
- 摘要：以聚丙烯酰胺、甲醛、二硫化碳、氢氧化钠为原料，制备出新型重金属絮凝剂二硫代羧基化羟甲基聚丙烯酰胺（DTMPAM）.分别以含Cu2+单一水样及含Cu2+、EDTA的混合水样为考察对象，研究DTMPAM在单一和混合体系中对Cu2+的去除性能.结果表明，单一体系中DTMPAM对Cu2+有着良好的去除效果，当水样pH值为2.0~6.0时，Cu2+的最高去除率在93.85%~97.49%之间.EDTA对DTMPAM除Cu2+呈抑制作用，随着体系pH值的降低，这种抑制作用减弱；高pH值体系中，随着EDTA浓度的增大，抑制作用增强；在混合体系中，EDTA与DTMPAM存在配位竞争作用，高pH值体系中EDTA的配位竞争作用占主要优势.在单一体系和混合体系中螯合絮体DTMPAM-Cu的分形维数与Cu2+的去除率均有显著的正相关性，即絮体分形维数越大，相对应的Cu2+去除率越高.
- Abstract：A novel heavy metal flocculant, dithiocarboxyl hydroxymethy-polyacrylamide (DTMPAM), was prepared by using polyacrylamide, formaldehyde, carbon disulfide and sodium hydroxide as raw materials. The removal performance of Cu2+ was studied with the water containing Cu2+ with/without EDTA. The results show that DTMPAM had good removal efficiency for Cu2+. The highest removal rate of Cu2+ was between 93.85% and 97.49% at pH 2.0 to 6.0. EDTA had an inhibiting effect on the removal of Cu2+ by coagulation with DTMPAM, and the inhibiting effect was weakened with the decrease of pH. When Cu2+ and EDTA co-existed, EDTA had the competition with DTMPAM, and more dominant at higher pH. DTMPAM-Cu had good positive correlation with the removal rate of Cu2+ in the single or mixed system, that is, the fractal dimension of flocs was the larger, and the removal rate of Cu2+ was the higher.
