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Removal of lead and cadmium in synthetic waste water using phaseolus vulgaris (beans) husk as bioadsorbent

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Author Affiliations

  • 1Department of Chemistry, University of Ibadan, Ibadan, Nigeria and Department of Science Laboratory Technology, Federal College of Animal Health and Production Technology, Ibadan, Nigeria
  • 2Department of Science Laboratory Technology, Federal College of Animal Health and Production Technology, Ibadan, Nigeria
  • 3Institute of Ecology and Environmental Studies, Obafemi Awolowo University, Ile-Ife, Nigeria

Int. Res. J. Environment Sci., Volume 9, Issue (2), Pages 1-6, April,22 (2020)

Abstract

The removal of heavy metals from wastewater and drinking water by the use of low cost bio-adsorbents is fast gaining research attention due to their effectiveness when compared with existing and expensive conventional methods such as ion exchange and membrane technology. Various agricultural wastes have been used in recent times for this bio-sorption process. In this study the readily available and cost effective husk of Phaseolus vulgaris, a local bean in southwestern Nigeria was used as adsorbent. The heavy metals concentration of the metal ion solution after adsorption was determined with Atomic Adsorption Spectroscopy (AAS). The result shows that removal efficiency of beans husk decreases with increase in initial concentration but increase with contact time and increasing adsorbent dosage. The adsorption capacity however increases with increase in initial concentration but decrease as adsorbent doses increase. The optimum pH for the adsorption of lead was 1.55 and 4.90 for cadmium. From the results, a cheap and cost effective adsorbent for the removal of heavy metals from waste water is achieved.

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