Abstract
Defatted rice bran, soybean and cottonseed hulls were evaluated for their sorption properties and resistance to mechanical abrasion in consideration of their potential use as commercial metal adsorbents. These by-products were evaluated using both laboratory prepared solutions and metal plating wastewater for their ability to adsorb Zn(II) and/or Cu(II) and Ni(II). Extrusion stabilized, pilot plant-prepared brans had greater adsorption capacities and adsorption efficiencies than expander stabilized, commercially available bran. All rice brans possessed low mechanical abrasion resistance in batch applications. NaOH- and HCl-washed soybean and cottonseed hulls had generally higher adsorption efficiencies than water-washed (control) hulls, but had higher or lower adsorption capacities, respectively, than water-washed hulls. Heat-treated cottonseed and soybean hulls had lower adsorption properties than water-washed hulls. Unlike rice bran, both soybean and cottonseed hulls were found to have high mechanical abrasion resistance in batch applications. Reuse of hulls after one adsorption/desorption (sorption) cycle resulted in a large decrease in adsorption capacity which classified hulls as single-use adsorbents when desorbed with HCl.
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