Adsorption of nickel by bentonite clays. A comparative study.
Wastewater from chemical process industry contains soluble metal ions and metal ion complexes that are toxic and difficult to remove. Here, adsorption of Ni(+2) has been investigated by using bentonites from Kutch, Gujarat. Synthetic nickel ion solutions of concentrations 100-1000 ppm were prepared in aqueous medium for the study. The amount of adsorbent is varied from 0.5-2.5% (w/v). Equilibrium concentrations of the metal ions have been analyzed by ICPS, UV-VIS and titrimetric methods. Adsorption of the metal ions is found to be influenced by the concentration of the salt solutions and the form of the metal ions. Basic medium allows better removal. Converting metal ions to metal ammines enhanced their adsorption.
Innovation & Knowledge Center, Ashapura Minechem Limited, 278 DN Road, Fort, Mumbai-400 001, India. ksuresh@ashapura.com
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D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D007220:Industrial Waste; D009532:Nickel / Q000302:isolation & purification*; D014865:Waste Disposal, Fluid / Q000379:methods*
D007220:Industrial Waste; D001546:Bentonite; D009532:Nickel