二酰二肼-甲醛树脂吸附Cu^(2+)的研究

Adsorption of Cu^(2+) with Dicarboxylic Acid Dihydrazide-formaldehyde Resins

二羧酸、水合肼与甲醛为原料合成乙二酰二肼 甲醛树脂、丙二酰二肼 甲醛树脂和丁二酰二肼 甲醛树脂。用分批处理法研究三种树脂吸附Cu2 + 的能力。结果表明 ,三种树脂吸附Cu2 + 的能力为丁二酰二肼 甲醛树脂 >丙二酰二肼 甲醛树脂 >乙二酰二肼 甲醛树脂。乙二酰二肼 甲醛树脂与丙二酰二肼 甲醛树脂 ,4h达到吸附平衡 ,pH =8时吸附率最佳 ,分别为 2 6 3 %和74 5 % ,而丁二酰二肼 甲醛树脂 ,3h后吸附率不再随时间变化 ,在 pH =9时吸附率最佳 ,为 85 %。吸附温度升高不利于吸附。丙二酰二肼 甲醛树脂、丁二酰二肼 甲醛树脂优先吸附Cu2 + ,而将Zn2 + 留在滤液中 ,可基本实现Cu2 + 与Zn2 +

The chelate resins of dicarboxylic acid dihydrazides formaldehyde are synthesized by the polycondensation of dicarboxylic acid dihydrazides with formaldehyde. The adsorption of Cu 2+ with the resins is investigated by batch method. The adsorption efficiency for Cu 2+ of three resins decreased in the order of succinic acid dihydrazides formaldehyde resin to malonic acid dihydrazides formaldehyde resin to oxalic acid dihydrazides formaldehyde resin. For oxalic acid dihydrazides formaldehyde and malonic acid dihydrazides formaldehyde resins, the adsorption equilibrium is reached by 4h retention time, and the highest adsorption efficiency, 26.3% and 74.5% respectively, is obtained at pH=8. And for succinic acid dihydrazides formaldehyde resin, the adsorption equilibrium is reached by 3h, the highest adsorption efficiency, 85%, is obtained at pH=9. The high temperature is unfavorable to Cu 2+ adsorption. Cu 2+ is preferably adsorbed to Zn 2+ with oxalic acid dihydrazides formaldehyde and malonic acid dihydrazides formaldehyde resins, so Cu 2+ and Zn 2+ can be separated.