Saeed Akbari; Mohammad Hadi Dehghani; Mehdi Salari
Abstract
Background and objective: Due to its high concentration on the surface and its pathogenic function, fluoride is noticeable. Fluoride at high concentrations can be dangerous. The World Health Organization's allowable concentration is 1.5milligrams per liter. The aim of this study was to take chitosan ...
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Background and objective: Due to its high concentration on the surface and its pathogenic function, fluoride is noticeable. Fluoride at high concentrations can be dangerous. The World Health Organization's allowable concentration is 1.5milligrams per liter. The aim of this study was to take chitosan from shrimp shells and evaluate its performance in the removal of fluoride in aqueous solutions. The purpose of this study was to isolate chitosan from shrimp shells native Persian Gulf and evaluate its performance in the removal of fluoride in aqueous solutions. Materials & Methods: Chitosan from shells native Persian Gulf shrimps in three stages, protein , minerals and de-acetylation separation. The isotherms and adsorption kinetics were evaluated in optimal conditions. Results: The results showed with 100 ml of 4 Results: milligrams per liter of fluoride, the fluoride removal at pH = 7, 60 minutes contact time and adsorbent concentration of 2 grams per liter respectively. The result of the absorption curve obeys a second-order. Freundlich adsorption isotherm data were more consistent. Maximum capacities of 0.157 milligrams per gram was with the removal of fluoride with chitosan. Conclusion:The extracted chitosan can be an effective adsorbent for the removal of fluoride from contaminated water so that the amount of fluoride in drinking water is reduced to below the allowable level of fluoride.
Amin Ahmaditabar; Mohammad Hadi Dehghani; Faezeh Izadpanah
Abstract
Background & Objective: Textile effluents contain significant amounts of toxic and organic pollutants. Due to health risks such as carcinogenic and mutagenic effects, discharge of this kind wastewater to water resources can lead to health impacts. The aim of this study was to survey the efficiency ...
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Background & Objective: Textile effluents contain significant amounts of toxic and organic pollutants. Due to health risks such as carcinogenic and mutagenic effects, discharge of this kind wastewater to water resources can lead to health impacts. The aim of this study was to survey the efficiency of Chitosan derivative in removal of basic dyes violet16 from aqueous solutions. Materials & Methods: In this study the influence of different parameters including contact time, initial dye concentration, adsorbent concentration, and PH, was studied. Residual of dye concentration was measured using a spectrophotometer set in 545 nm wavelength. Adsorption data was described by Langmuir and Freundlich isotherms and kinetic reactions. Results: The results showed that increasing contact time and adsorbent dose enhances dye removal rates for this adsorbent. By decreasing initial concentration of dye, removal rates increased. In optimal conditions, Chitosan derivatives were able to remove dye 68 percent respectively. For this adsorbents optimum pH was obtained 10. According to the results, adsorption process for both adsorbents was determined by Freundlich isotherm by R2>0.98. Dye absorption kinetic of both adsorbents followed pseudo second degree by R2>0.98. Conclusion: the results showed that Chitosan derivative can be applied as an efficient adsorbent for removal basic violet 16 dye from aqueous solutions.