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Paper Information

Journal:   JUNDISHAPUR JOURNAL OF NATURAL PHARMACEUTICAL PRODUCTS   MAY 2014 , Volume 9 , Number 2; Page(s) 0 To 0.
 
Paper: 

MERCURY REMOVAL FROM AQUEOUS SOLUTIONS WITH CHITOSAN-COATED MAGNETITE NANOPARTICLES OPTIMIZED USING THE BOX-BEHNKEN DESIGN

 
 
Author(s):  RAHBAR NADEREH*, JAHANGIRI ALIREZA, BOUMI SHAHIN, KHODAYAR MOHAMMAD JAVAD
 
* DEPARTMENT OF MEDICINAL CHEMISTRY, SCHOOL OF PHARMACY, AHVAZ JUNDISHAPUR UNIVERSITY OF MEDICAL SCIENCES, AHVAZ, IR IRAN
 
Abstract: 

Background: Nowadays, removal of heavy metals from the environment is an important problem due to their toxicity.
Objectives: In this study, a modified method was used to synthesize chitosan-coated magnetite nanoparticles (CCMN) to be used as a low cost and nontoxic adsorbent. CCMN was then employed to remove Hg2+ from water solutions.
Materials and Methods: To remove the highest percentage of mercury ions, the Box-Behnken model of response surface methodology (RSM) was applied to simultaneously optimize all parameters affecting the adsorption process. Studied parameters of the process were pH (5-8), initial metal concentration (2-8 mg/L), and the amount of damped adsorbent (0.25-0.75 g). A second-order mathematical model was developed using regression analysis of experimental data obtained from 15 batch runs.
Results: The optimal conditions predicted by the model were pH=5, initial concentration of mercury ions=6.2 mg/L, and the amount of damped adsorbent=0.67 g. Confirmatory testing was performed and the maximum percentage of Hg2+ removed was found to be 99.91%. Kinetic studies of the adsorption process specified the efficiency of the pseudo second-order kinetic model. The adsorption isotherm was well-fitted to both the Langmuir and Freundlich models.
Conclusions: CCMN as an excellent adsorbent could remove the mercury ions from water solutions at low and moderate concentrations, which is the usual amount found in environment.

 
Keyword(s): CHITOSAN, MAGNETITE NANOPARTICLES, MERCURY
 
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