巯基活性碳富集剂对重金属离子的吸附特性

从热力学、动力学及XPS3个方面讨论了巯基活性碳富集剂对重金属离子的吸附机理。结果表明富集剂的吸附过程以化学吸附为主。外表面,内表面对Cu~(2+)的吸附率分别为19%,81%;Pb~(2+)为6%,94%,对Zn~(2+)为17%,83%,而吸附Cd~(2+)完全由内扩散所控制。被吸附的Cu~(2+)还将进一步还原为Cu~o。

CHARACTERISTICS OF SULFHYDRYL-CONTAINING ADSORBENT BASED ON ACTIVE CARBON

The absorption mechanism of a novel separation absorbent containing sulfhydryl group has been studied in terms of thermodynamics and kinetics. The results indicate that the adsorbent is able to absorb heavy metal ions:Cu~(2+) ,Pb~(2+) ,Cd~(2+), and Zn~(2+). The predominant process of the adsorption is a chemical adsorption. The amount of the adsorption on the outer and internal surface of the adsorbent is 19% and 81% for Cu~(2+);6% and 94% for Pb~(2+); 17% and 83% for Zn~(2+), respectively ; while the adsorption of Cd~(2+) is controlled only by internal diffusion. For Cd~(2+) only an outer surface adsorption was observed. The XPS results show that Cd~(2+) , Pb~(2+) and Zn~(2+) are adsorbed and thus enriched by the novel separation adsorbent. The Cu~(2+) adsorbed may be then reduced to Cu~o.