Peanut shell activated carbon: Adsorption capacities for copper(II), zinc(II), nickel(II) and chromium(VI) ions from aqueous solutions

被引：30

作者：

Romero, LC ^{[1
]}

Bonomo, A ^{[1
]}

Gonzo, EE ^{[1
]}

机构：

[1] Univ Nacl Salta, Fac Ingn, Quim INIQUI CONICET, Salta, Argentina

来源：

ADSORPTION SCIENCE & TECHNOLOGY | 2004年 / 22卷 / 03期

关键词：

D O I：

10.1260/0263617041503499

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The adsorption of copper(II), zinc(II), nickel(II) and chromium(VI) ions from aqueous solutions onto an activated carbon produced from peanut shell was studied as a function of the concentration of the ions and the pH value. The amounts of Cu(II), Zn(II) and Ni(II) ions adsorbed increased with increasing equilibrium pH of the solution, while the uptake of Cr(VI) ions decreased. For Cr(VI) ions, maximum uptakes were found at a pH below the point of zero charge of the adsorbent (pH(pzc)). The amount of metal cation adsorbed at a given equilibrium concentration increased in the order Ni(II) < Zn(II) < Cu(II). This metal ion uptake order may be explained from a consideration of the combined effects of the electronegativity of the metal ion and the first stability constant of the corresponding metal hydroxide. The activated carbon produced from peanut shell was an effective and economic adsorbent for the removal of metal cations at pH > pH(pzc) and anions at pH less than or equal to pH(pzc).

引用

页码：237 / 243

页数：7

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