二酰二肼-甲醛树脂结合与捕获Zn^(2+)能力的评价

Evaluation of Binding and Capturing Ability of Dicarboxylic Acid Dihydrazide-formaldehyde Resins for Zn^(2+)

以二羧酸、水合肼与甲醛为原料,合成了3个含氮、氧官能团树脂: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. 用分批处理法评价了这3种树脂捕获Zn2+的能力. 3种树脂捕获Zn2+的捕获能力的大小为: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. 讨论了捕获时间、捕获温度、pH值对捕获Zn2+能力的影响. 捕获能力随pH值不同而不同. 高温不利于捕获. 捕获时间为3 h时,吸附捕获达到平衡.

The chelate resins of dicarboxylic acid dihydrazides-formaldehyde were synthesized by polycondensation of dicarboxylic acid dihydrazides with formaldehyde. The collecting ability for Zn2+ was investigated by batch tests. The collecting efficiency of these three resins decreased in the order of succinic acid dihydrazides-formaldehyde resin>malonic acid dihydrazides-formaldehyde resin>oxalic acid dihydrazides-formaldehyde resin. The influences of pH value, capturing time and temperature were investigated. It is found that the collecting efficiency is dependent on pH value, and high temperature is unfavorable to collecting Zn2+. The resins reach the highest capacity of Zn2+ capture after 3 h of adsorption.