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Paper Information

Journal:   SCIENTIFIC JOURNAL OF KURDISTAN UNIVERSITY OF MEDICAL SCIENCES   SUMMER 2012 , Volume 17 , Number 2 (SERIAL NUMBER 64); Page(s) 82 To 95.
 
Paper: 

BIOSORPTION OF CADMIUM AND COPPER IONS FROM AQUEOUS SOLUTION BY CHEMICALLY MODIFIED WHEAT STRAW

 
 
Author(s):  MALEKI A.*, ZANDI SH., MAHVI A.H.
 
* ENVIRONMENTAL HEALTH DEPT., ENVIRONMENTAL HEALTH RESEARCH CENTER, KURDISTAN UNIVERSITY OF MEDICAL SCIENCES, SANANDAJ, IRAN
 
Abstract: 

Backgrounds and Aim: Increased environmental pollution caused by toxic metals is a great concern because of their carcinogenic, non-biodegradability and bio-accumulation properties. Cadmium (Cd) and copper (Cu) are two of the most common heavy metals in the environment. The objective of this study was to assess the effect of modified wheat straw promoted by sodium bicarbonate for removal of cadmium and copper from aqueous solution.
Materials and Methods: Adsorption process was accomplished in a laboratory-scale batch with emphasis on the effect of various parameters such as pH, contact time, arsenic concentration and adsorbent dosage on adsorption efficiency. In order to understand the adsorption process, equilibrium isotherms were also determined.
Results: The results of this study showed that adsorption of the Cd and Cu was influenced by several parameters such as arsenic initial concentration, adsorbent dosage and solution pH. Maximum adsorption efficiency was achieved at a pH of 7. The adsorbed amount of metal ions increased with the initial concentration of the metals. Among the isotherm models tested, i.e., the Langmuir, Freundlich, and DubininRadushkevich, the adsorption equilibrium of both Cd and Cu was best described by the Langmuir and Freundlich models. Mean values of the free energies of adsorption (11.1 kJ mol-1 for Cd and11.4 kJ mol-1 for Cu) indicated that adsorption of Cd and Cu ions by wheat straw might follow a chemisorption mechanism.
Conclusion: We concluded that adsorption by modified wheat straw is an efficient and reliable method for removal of Cd and Cu from aqueous solutions.

 
Keyword(s): ADSORPTION, WHEAT STRAW, ADSORPTION ISOTHERM, CADMIUM, COPPER
 
References: 
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