Peanut Shell Activated Carbon: Adsorption Capacities for Copper(II), Zinc(II), Nickel(II) and Chromium(VI) Ions from Aqueous Solutions

Abstract

ABSTRACT: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 ≤ pH pzc .

Adsorption of Hexavalent Chromium from Aqueous Solution Using Chemically Activated Carbon Prepared from Locally Available Waste of Bamboo (Oxytenanthera abyssinica)

“…Some low cost activated carbons used for removing of Hexavalent Chromium ions such as groundnut husk [19], agrowaste [20], neem leaves [21], sawdust [22], wheat bran [23], rice bran [24], sago waste [25], green coconut shell [26], hazelnut shell [27], olive stone [28], gingelly oil cake [29], and peanut shell [30,31] have all been reported as useful for preparing adsorbents.…”

Alkali-treated Carbonized Rice Husk for the Removal of Aqueous Cr(VI)

“…Agricultural biowaste materials have been tested for the removal of heavy metal ions from water, including sawdust (Garg et al 2004), bamboo (Dula et al 2014), neem leaves (Babu and Gupta 2008), olive cake (Dakiky et al 2002), green coconut shell (Pino et al 2006), groundnut husk (Dubey and Gopal 2007), and peanut shell (Romero et al 2004). Biowaste is a suitable candidate for the preparation of AC because of its underutilization and/or availability in large quantities (Garg et al 2007).…”

Biosorption characteristics of uranium(VI) from aqueous solution by pummelo peel

“…Studies have shown that a variety of agricultural waste can remove toxic heavy metal ions effectively, such as rice bran [4], rice husk [5], bark [6], peanut shells [7], coconut shell [8], wheat straw [9], waste tea leaves [10], bagasse [11], water hyacinth [12], coffee beans [13], a variety of plants, sawdust [14], etc. [15,16].…”