Utilization of peanut shells as adsorbents for selected metals

Abstract

Peanut shells of mesh size 10–20 were modified by combinations of treatments following a 32 factorial design. Treatments consisted of either no wash, water wash or base wash followed by no modification or modification with 0.6 M citric acid or 0.6 M phosphoric acid. The nine samples were evaluated for their uptake of five metal ions (Cd(II), Cu(II), Ni(II), Pb(II) and Zn(II)) from solution. The results were compared with metal ion adsorption by three commercial cation exchange resins, namely, Amberlite® 200, Amberlite® IRC 718 and Duolite® GT‐73. The percent of metal ions adsorbed per gram of adsorbent was significantly increased by each of the acid treatments, average values ranged from 19 to 34% compared with non‐acid treated samples at 5.7%. The percent of metal ions adsorbed for base‐washed samples were higher than water‐washed or unwashed shells. Interaction between wash and acid treatment was not significant for most of the experimental conditions used. Acid‐treated samples were as effective as Duolite® GT‐73 in the adsorption of Cd(II) and almost twice as effective in the adsorption of Zn(II) from solutions containing a single metal ion. In solutions containing multiple metal ions, citric acid samples were found to be most effective and selective for Cu(II) compared with Cd(II), Ni(II), and Zn(II). In general, phosphoric acid‐modified shells removed the most metals from solution for the experimental samples and were more effective in removing Cd(II) and Zn(II) than two of the three commercial resins. Acid‐modified peanut shells are promising as metal ion adsorbents. © 1999 Society of Chemical Industry

Copper Removal Using Acid Activated Peanut Husk From Aqueous Solution

“…Moreover, these techniques fail to remove heavy metals when present at low concentration. From past few years researchers are interested in substituting costly methods of water treatment by low cost ions after chemical activation of peanut hull (Wafwayo et al 1999). Similar kind of behavior of higher adsorption of copper was obtained by other researchers (Charmarthy et al 2001) Activation of biosorbent consists of multiplying amount of pores of certain carbonaceous material to produce extremely porous structure.…”

Adsorption of cadmium (II) from simulated wastewater using <i>Albizia saman</i> pod activated carbon in fixed bed columns

“…Activated carbons of biological origin have been used for the removal of heavy metals from aqueous solution [9][10][11][12]. Agricultural adsorbents such as coffee husk [13], peanut shells [14], mango seed shell [15], bagasse [16], rice husk [17], sawdust [18] and sorghum bicolor stalk [19] among others have also been successfully used for the removal of various pollutants from water. The adsorption of lead (Pb 2+ ), copper (Cu 2+ ) and zinc(Zn 2+ ) on sawdust in fixed bed columns was studied by [20].…”

Potentiality of Uranium Adsorption and Its Associated Elements From Waste Laboratory Liquids Using Black Tea Waste

“…Numerous waste biomass sources are available and upon which several experimental adsorption studies were performed e.g. rice husk (Zulkali et al, 2006), peanut shells (Wafwoyo et al, 1999) ,corn cobs (Vaughan et al, 2001) saw dust ( Sciban et al, 2006),etc.…”