胺基改性苯乙烯树脂对Cr(VI)的吸附行为分析.

The modified resins were aminated with styrene resin as matrix. The adsorption behavior of the modified resins for Cr(Ⅵ) was discussed and the modified resins was characterized. Characterization test results show that the surface of aminated resins had more porous channels, the specific surface area was 271.64 m~2/g, the element content of N in the modified resins reached 3.45% and the amination effect was ideal. The adsorption experiment results show that the adsorption equilibrium time of aminated resins was 2 h, the adsorption process of modified resins was more suitable for the Langmuir model of single molecular layer adsorption, and the kinetic adsorption behavior was in good agreement with the first-order kinetics. The adsorption process was endothermic. Amino modified styrene resins had ideal adsorption effect on heavy metal ion Cr(Ⅵ) and the adsorption were the results of the interaction of hydroxyl group, amino group and double bond on the surface of resin. The adsorption capacity of the modified resin was 298.75 mg/g, and the adsorption rate was 93.24%. The results of 20 repeated experiments were satisfactory with the relative standard deviation of 0.024. The experimental results show that the amine modified adsorption resin could be used for enrichment and purification of heavy metal ion Cr(Ⅵ) and had good reusability. [ABSTRACT FROM AUTHOR]