氨基和巯基修饰磁性吸附剂脱除汞离子和镉离子的试验

摘要

The magnetic ferric oxide nanoparticle adsorbents modified by amino and thiol were prepared for the removal of mercury ions and cadmium ions in solutions.Results showed that in the case of single ion solution,90％ of the metal ions could be removed after 25 min with the adsorbent dosage at 1 g/L,or after 20 min with the dosage at 2.5 g/L.Compared comprehensively,the thiol-modified adsorbent had better adsorption effect than the amino-modified sorbent.As to the case of dual ion solution,required amounts of both the adsorbents increased.Both the adsorbents had better selective adsorption for mercury than cadmium.%分别制备了由氨基和巯基修饰的磁性氧化铁纳米粒子吸附剂以吸附脱除溶液中的汞离子和镉离子.结果表明,当溶液中仅有单种离子时,采用1 g/L的投加量,25 min后两种吸附剂均可吸附90％的金属离子;而采用2.5 g/L的投加量,20 min后也可达到90％的脱除效果.综合比较,巯基修饰吸附剂的吸附效果优于氨基修饰吸附剂.当两种金属离子同时存在时,所需的吸附剂量增加.两种吸附剂对汞的选择吸附效果均好于镉.