Background: Zinc is an abundant element in the Earth's crust at approximately 0.04 grams to kilograms. The Zinc sulfide is found mostly in nature. The deposition of Zinc absorption by the amount of soluble in aqueous solutions decreases. In this study, the removal of Zi More
Background: Zinc is an abundant element in the Earth's crust at approximately 0.04 grams to kilograms. The Zinc sulfide is found mostly in nature. The deposition of Zinc absorption by the amount of soluble in aqueous solutions decreases. In this study, the removal of Zinc was investigated by Scenedesmus algae.
Methods: To determine the amount of Zinc absorbed by the absorbent Scenedesmus concentrations of pollutants under different conditions, adsorbent dose, contact time, pH back and the remaining amount was measured by atomic absorption. Adsorption isotherms and kinetic modeling of metal ions on the adsorbent based on the model of Langmuir, Freundlich and kinetics were determined pseudo-first and pseudo-second.
Results: absorption and adsorption kinetics by Langmuir and Freundlich isotherm models by the model described by pseudo first order and pseudo-second. The results showed that the correlation coefficient, absorption kinetics of pseudo-second-order model with an amount equal to 1 and the balance by the amount of 0.7926 were described by Freundlich isotherm.
Conclusion: This study showed absorption process due to the high correlation algae Scenedesmus sp feature is the removal of Zinc And can be to used proposed as appropriate for the removal of the wastewater.
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Background and objective: Each year about billion tons of dyes from textile and dyeing industry are discharged in the wastewater, which they are the most dangerous chemicals. Then removing this dyes from wastewater requires proper treatment before being released into th More
Background and objective: Each year about billion tons of dyes from textile and dyeing industry are discharged in the wastewater, which they are the most dangerous chemicals. Then removing this dyes from wastewater requires proper treatment before being released into the environment. The aim of this study is to evaluate and determine the possibility of using absorbent obtained from the Fe3O4-Oak as a low-cost adsorbent for the removal of methylene blue from aqueous solution.
Material and Methodology: FTIR analysis was used to investigate the presence of magnetite iron in the oak structure. In these tests, a batch system was used for the absorption process. The effect of pH, adsorbent dosage, and initial concentration of dye and time as key parameters were evaluated. Also, the isotherm models were used to study the experimental adsorption data.
Findings: The results that increasing pH increases the removal rate and the highest adsorption was obtained at pH 7. The Langmuir, Freundlich, temkin and Dubinin–Radushkevich isotherm models were used to evaluate experimental data and obtained results indicated that the Langmuir isotherm and Dubinin–Radushkevich models is better than other models with data obtained. Finally, the results of this study indicate that used absorbent have high efficiency for removal of methylene blue. The pseudo-second-order kinetic model well depicted the kinetics of dyes adsorption on adsorbent.
Discussion and Conclusion: This study has been showed that the present adsorbent has a good case for removing dye from wastewater and also, having the magnetic property of the adsorbent will cause more rapid regeneration.
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Abstract Background and Objective: Presence of toxic heavy metals like nickel in water resources is a major environmental problem in many communities. Method: In this study, to stimulate the removal of Ni (II) from aqueous solution by silica aerogel-activated car More
Abstract Background and Objective: Presence of toxic heavy metals like nickel in water resources is a major environmental problem in many communities. Method: In this study, to stimulate the removal of Ni (II) from aqueous solution by silica aerogel-activated carbon nanocomposite, the parameters affecting the adsorption process such as pH, amount of adsorbent, contact time, temperature and concentration were investigated and optimized. Findings: The results showed the maximum adsorption at pH= 5. The lower pH, the more H+ ion competing with the metal ion for adsorption sites. Kinetic studies indicated that the adsorption process followed the pseudo-second order kinetics. Moreover, the equilibrium data related to adsorption isotherms showed a superiority of the Langmuir isotherm compared to other models. Discussion and Conclusion: Calculation of thermodynamic factors, such as ΔG◦, ΔH◦ and ΔS◦, indicated that the adsorption process is spontaneous, endothermic and irreversible. The results showed that silica aerogel-activated carbon nanocomposite has been successfully employed for the removal of Ni (II) from aqueous solutions.
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In this study, functionalized zeolite (Zeolite-APTES) has been used to remove lead ions in an aqueous environment. Zeolites have received much attention due to their ion exchange capacity and chemical and mechanical stability. Parameters influencing the lead ion adsorpt More
In this study, functionalized zeolite (Zeolite-APTES) has been used to remove lead ions in an aqueous environment. Zeolites have received much attention due to their ion exchange capacity and chemical and mechanical stability. Parameters influencing the lead ion adsorption process, including adsorbent content (mg), initial concentration (ppm), pH, and time (min) were investigated and optimized using an experimental design by response surface methodology ( RSM ) approach. The results show that the lead adsorption efficiency from aqueous solution increases with increasing time and the adsorbent content and gradually reaches a constant value. The percentage of lead removal also decreases with an increasing initial concentration of lead ions. Functionalized zeolite has shown good adsorption capacity for the lead. The maximum adsorption capacity was found to be 89.28 mg.g-1. Furthermore, the adsorption follows a Langmuir isotherm and pseudo-first-order kinetic model. The developed composite exhibits great potential for heavy metal adsorption and wastewater treatment.
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