活性炭直接吸附铜铁锰锌离子的机理

The Mechanism of Metal Ions onto Activated Carbin Particles

本文研究了Cu^(2+) 、Fe^(3+)、Mn^(2+)、Zn^(2+)在活性炭上的吸附作用,以及环境条件对这种吸附作用的影响。实验表明,它们在活性炭上的吸附强度顺序为Fe^(3+)>Cu^(2+)>Zn^(2+)>Mn^(2+)。所试离子除Fe^(3+)以部分FeOHeOH^(2+)形式外,均主要以离子形式与活性炭颗粒直接键合而被吸附。它们的吸附作用符合表面络合吸附模式,以简化络合反应模式计算出的表面络合形成条件稳定常数大小顺序与试验结果一致。

In this paper. the adsorption of Fe3+. Cu2+, Mn2+, and Zn2+ on activated carbion particles was studied as a func=tion of PH .concentrations of adsorbace and adsorbent. Experimental re-suits showed that the adsorption was strongly PH - dependent and all the adsorption isotherms were in agreement with Fre undliun Equation. ALL Tested ions were adsorbed in the form of ions save Fe3+. The adsorbed order as followes:Fe>Cu>Mn> Zn. The adsorption could be explained by the surface complexation model. Conditional adsorption constants of surface complexes of Fe3+ . Cu2+ .Mn2+ .and Zn2+with Whch activated carbon particles were calculated by a simplified surface complexation model. Key Words: Adsorption mechanism Activated carbon particles Metal ions