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Onion membrane: an efficient adsorbent for decoloring of wastewater.

Saber-Samandari S, Heydaripour J - J Environ Health Sci Eng (2015)

Bottom Line: Recently, researchers have tried to design synthetic materials by replicating natural materials as an adsorbent for removing various types of environmental pollutants, which have reached to the risky levels in nature for many countries in the world.In this research, the potential of onion membrane obtained from intermediate of onion shells for adsorption of methylene blue (MB) as a model cationic dye was exhibited.Evidently, the high efficiency and fast removal of methylene blue using onion membrane suggest the synthesis of polymer-based membranes with similar physical and chemical properties of onion membrane as a valuable and promising wastewater decoloring agents in water treatment.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Eastern Mediterranean University, TRNC via Mersin 10, Gazimagusa, Turkey.

ABSTRACT

Background: Recently, researchers have tried to design synthetic materials by replicating natural materials as an adsorbent for removing various types of environmental pollutants, which have reached to the risky levels in nature for many countries in the world. In this research, the potential of onion membrane obtained from intermediate of onion shells for adsorption of methylene blue (MB) as a model cationic dye was exhibited.

Methods: Before and after adsorption, the membrane was characterized by Fourier transform infrared spectroscopy (FTIR) and optical and scanning electron microscopy in order to prove its dye adsorption capability. The various experimental conditions affecting dye adsorption were explored to achieve maximum adsorption capacity.

Results: The dye adsorption capacity of the membrane was found to be 1.055 g.g(-1) with 84.45% efficiency after one hour and 1.202 g.g(-1) with 96.20% efficiency after eight hours in contact with the dye solution (0.3 g.L(-1)). Moreover, the kinetic, thermodynamic and adsorption isotherm models were employed to described the MB adsorption processes. The results show that the data for adsorption of MB onto the membrane fitted well with the Freundlich isotherm and pseudo-second-order kinetic models. In addition, the MB adsorption from room temperature to ~50°C is spontaneous and thermodynamically favorable.

Conclusions: Evidently, the high efficiency and fast removal of methylene blue using onion membrane suggest the synthesis of polymer-based membranes with similar physical and chemical properties of onion membrane as a valuable and promising wastewater decoloring agents in water treatment.

No MeSH data available.


Effect of temperature on the MB adsorption capacity (g.g−1) and efficiency (%) of membrane was plotted. In these experiments, 0.06 g of membrane adsorbed dye molecules from a 0.3 g.L−1 dye solution (250 ml) with a pH of 7.1 for 8 hours.
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Fig10: Effect of temperature on the MB adsorption capacity (g.g−1) and efficiency (%) of membrane was plotted. In these experiments, 0.06 g of membrane adsorbed dye molecules from a 0.3 g.L−1 dye solution (250 ml) with a pH of 7.1 for 8 hours.

Mentions: The effect of temperature on the adsorption capacity of onion membrane (0.06 g) was studied using 250 mL of MB solution in different temperatures (20°C-60°C) for eight hours (480 min) in the atmospheric conditions. As shown in Figure 10, increasing the temperature leads to a decrease in the MB adsorption capacity of the membrane (0.164 g.g−1, with 13.15% efficiency) after eight hours of contact time. This can be attributed to a weakening of the adsorptive forces between the active sites on the sorbent and the dye molecules due to the degradation of the onion membrane in the high temperature. The results suggest that a high temperature is not suitable for adsorbing MB when the onion membrane is adsorbent. Therefore, it is better to let the temperature of industrial outcome solutions decrease to 20°C to achieve maximum adsorption capacity.Figure 10


Onion membrane: an efficient adsorbent for decoloring of wastewater.

Saber-Samandari S, Heydaripour J - J Environ Health Sci Eng (2015)

Effect of temperature on the MB adsorption capacity (g.g−1) and efficiency (%) of membrane was plotted. In these experiments, 0.06 g of membrane adsorbed dye molecules from a 0.3 g.L−1 dye solution (250 ml) with a pH of 7.1 for 8 hours.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4374185&req=5

Fig10: Effect of temperature on the MB adsorption capacity (g.g−1) and efficiency (%) of membrane was plotted. In these experiments, 0.06 g of membrane adsorbed dye molecules from a 0.3 g.L−1 dye solution (250 ml) with a pH of 7.1 for 8 hours.
Mentions: The effect of temperature on the adsorption capacity of onion membrane (0.06 g) was studied using 250 mL of MB solution in different temperatures (20°C-60°C) for eight hours (480 min) in the atmospheric conditions. As shown in Figure 10, increasing the temperature leads to a decrease in the MB adsorption capacity of the membrane (0.164 g.g−1, with 13.15% efficiency) after eight hours of contact time. This can be attributed to a weakening of the adsorptive forces between the active sites on the sorbent and the dye molecules due to the degradation of the onion membrane in the high temperature. The results suggest that a high temperature is not suitable for adsorbing MB when the onion membrane is adsorbent. Therefore, it is better to let the temperature of industrial outcome solutions decrease to 20°C to achieve maximum adsorption capacity.Figure 10

Bottom Line: Recently, researchers have tried to design synthetic materials by replicating natural materials as an adsorbent for removing various types of environmental pollutants, which have reached to the risky levels in nature for many countries in the world.In this research, the potential of onion membrane obtained from intermediate of onion shells for adsorption of methylene blue (MB) as a model cationic dye was exhibited.Evidently, the high efficiency and fast removal of methylene blue using onion membrane suggest the synthesis of polymer-based membranes with similar physical and chemical properties of onion membrane as a valuable and promising wastewater decoloring agents in water treatment.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Eastern Mediterranean University, TRNC via Mersin 10, Gazimagusa, Turkey.

ABSTRACT

Background: Recently, researchers have tried to design synthetic materials by replicating natural materials as an adsorbent for removing various types of environmental pollutants, which have reached to the risky levels in nature for many countries in the world. In this research, the potential of onion membrane obtained from intermediate of onion shells for adsorption of methylene blue (MB) as a model cationic dye was exhibited.

Methods: Before and after adsorption, the membrane was characterized by Fourier transform infrared spectroscopy (FTIR) and optical and scanning electron microscopy in order to prove its dye adsorption capability. The various experimental conditions affecting dye adsorption were explored to achieve maximum adsorption capacity.

Results: The dye adsorption capacity of the membrane was found to be 1.055 g.g(-1) with 84.45% efficiency after one hour and 1.202 g.g(-1) with 96.20% efficiency after eight hours in contact with the dye solution (0.3 g.L(-1)). Moreover, the kinetic, thermodynamic and adsorption isotherm models were employed to described the MB adsorption processes. The results show that the data for adsorption of MB onto the membrane fitted well with the Freundlich isotherm and pseudo-second-order kinetic models. In addition, the MB adsorption from room temperature to ~50°C is spontaneous and thermodynamically favorable.

Conclusions: Evidently, the high efficiency and fast removal of methylene blue using onion membrane suggest the synthesis of polymer-based membranes with similar physical and chemical properties of onion membrane as a valuable and promising wastewater decoloring agents in water treatment.

No MeSH data available.