Author(s): Gmp Kumara; Takeshi Saito; Ken Kawamoto
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Abstract: This paper presents a batch study conducted to investigate the potential use of recycle concrete fines as low-cost adsorbents for treatment of wastewater. The capacity of three particle sizes of recycle concrete fines to adsorb Pb and Cd was studied at initial metal concentrations, different pH, ionic strength and with competitive metals. Results showed that small and medium size particles have higher and almost same adsorption capacity when compare with larger particles for both metals. Langmuir model performed with R > 0.93 for both Cd and Pb, better than Freundlich model. Adsorption of Pb ions by concrete fines were independent of pH and ionic strength of the solution. The selectivity sequence for competitive adsorption of Pb and Cd was alternated from single metal to multi-metal solutions as Pb> Cu> Cd> Zn> Ni to Pb> Cu> Ni> Cd> Zn respectively.
Year: 2018