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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 12    
Website: http://www.ijser.org
scirp IJSER >> Volume 2, Issue 12, December 2011
Adsorption Studies of Zn (II) Ions from wastewater using Calotropis procera as an adsorbent
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Vinod Vaishnav , Suresh Chandra , Dr. Kailash Daga
Wastewaters, Zinc, Adsorption, Adsorption isotherms, Calotropis procera
Zinc is an essential mineral of "exceptional biologic and public health importance"2. Zinc is an essential trace element, necessary for plants, animals, and microorganisms. Zinc deficiency affects about two billion people in the developing world and is associated with many diseases4.In children it causes growth retardation, delayed sexual maturation, infection susceptibility, and diarrhea1. Treatment of zinc from polluted water and wastewater has received a great deal of attention. Adsorption technique is one of the most technologies for the treatment of polluted water from zinc 3, but seeking for the low-cost adsorbent is the target of this study. Removal of zinc was studied using adsorbent prepared from Calotropis procera leaves. Batch adsorption experiments were performed by varying adsorbate dose, pH of the metal ion solution and contact time. Adsorption of Zn (II) is highly pH-dependent and the results indicate that the maximum removal (75.2%) took place in the pH range of 6 and initial concentration of 60 ppm. Kinetic experiments revealed that the dilute Zinc (II) solutions reached equilibrium within 105 min. The adsorbent capacity was also studied. The zinc adsorption followed both the Langmuir6and Freundlich's equation isotherms5. Comprehensive characterization of parameters indicates Calotropis procera to be an excellent material for adsorption of Zn (II) ions to treat wastewaters containing low concentration of the metal.
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