中文摘要：

以三乙烯四胺（TETA）、环氧氯丙烷、氢氧化钠和二硫化碳为原料合成了一种重金属螯合絮凝剂（HMCF）,考察了其对游离和络合Pb2＋、Cd2＋废水的处理效果,以及所得重金属螯合沉淀物的稳定性;采用红外光谱和紫外光谱对其和所得重金属螯合沉淀物的结构进行了表征;通过扫描电镜和电子能谱考察了絮体的形貌和组成。结果表明,对游离Pb2＋和Cd2＋的去除,在-CSS-与Pb2＋和Cd2＋摩尔比分别为1.8∶1和2∶1时,残余重金属离子浓度都低于相应的国家污水综合排放标准（GB 8978-1996）;而对络合Pb2＋、Cd2＋的去除,-CSS-与Pb2＋和Cd2＋的摩尔比按络合剂硫脲、柠檬酸和EDTA顺序增加,络合Pb2＋的摩尔比分别为2∶1、2.2∶1和2.4∶1,络合Cd2＋的摩尔比分别为2.2∶1、2.4∶1和2.6∶1;螯合沉淀物HMCF-Pb和HMCF-Cd结构致密,在弱酸性和碱性条件下很稳定;能谱分析表明,-CSS-与Pb2＋和Cd2＋按2∶1的摩尔比生成螯合物。

英文摘要：

A new heavy metal chelating flocculant（HMCF） was synthesized using triethylene tetramine（TETA）,epichlorohydrin,sodium hydroxide and carbon disulfide as raw materials.Its removal effeciency for free and complexing Pb2＋ and Cd2＋ in wastewater and the stability of its chelated precipitates were investigated,and the structures of HMCF and its chelated precipitates were characterized by FT-IR and ultraviolet spectroscopy.The images and compositions of the flocs were investigated by using scanning electron microscope and energy spectrum analysis.The results show that,for the treatment of free Pb2＋ and Cd2＋,the molar ratios of-CSS-to Pb2＋ and Cd2＋ are 1.8∶ 1 and 2∶ 1,respectively,and the residual Pb2＋ and Cd2＋ are all belowed Integrated Wastewater Discharge Standard of China（GB 8978-1996）;while for the treatment of complexing Pb2＋ and Cd2＋,the molar ratios of-CSS-to Pb2＋ and Cd2＋ increase in the order（according to the type of complexing agent）： thioureacitric acidEDTA,of which the molar ratios of-CSS-to Pb2＋ for complexing Pb2＋ are 2∶ 1,2.2∶ 1 and 2.4∶ 1,respectively,and the molar ratios of-CSS-to Cd2＋ for complexing Cd2＋ are 2.2∶ 1,2.4∶ 1 and 2.6∶ 1,respectively.The chelated precipitates of HMCF-Pb and HMCF-Cd are very dense and stable under weak acid and alkali conditions.The results of energy spectrum analysis show that-CSS-reacts with Pb2＋ and Cd2＋ to form chelates according to a molar ratio of 2∶ 1.