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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 time on MB adsorption capacity (g.g−1) and efficiency (%) of membrane was plotted. In this experiment, dye molecules from a 0.3 g.L−1 dye solution (250 ml) with a pH of 7.1 at 20°C were taken up by 0.06 g of the membrane. Insert shows the onion membrane in swollen and dye-adsorbed state.
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Fig3: Effect of time on MB adsorption capacity (g.g−1) and efficiency (%) of membrane was plotted. In this experiment, dye molecules from a 0.3 g.L−1 dye solution (250 ml) with a pH of 7.1 at 20°C were taken up by 0.06 g of the membrane. Insert shows the onion membrane in swollen and dye-adsorbed state.

Mentions: The adsorption performance of the onion membrane was evaluated by a batch equilibration technique as a function of time. As shown in Figure 3, the adsorption capacity of MB ions on the membrane increased rapidly during the first hour of contact and then became slower until equilibrium was reached after eight hours (480 min). The maximum adsorption was 1.055 g.g−1 with 84.45% efficiency after the first hour and 1.202 g.g−1 with 96.20% efficiency after eight hours. This behavior can be attributed to the larger surface area of the onion membrane at the initial stage of the adsorption process. Subsequently, as the surface sites became saturated, adsorption did not increase significantly with further contact time.Figure 3


Onion membrane: an efficient adsorbent for decoloring of wastewater.

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

Effect of time on MB adsorption capacity (g.g−1) and efficiency (%) of membrane was plotted. In this experiment, dye molecules from a 0.3 g.L−1 dye solution (250 ml) with a pH of 7.1 at 20°C were taken up by 0.06 g of the membrane. Insert shows the onion membrane in swollen and dye-adsorbed state.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig3: Effect of time on MB adsorption capacity (g.g−1) and efficiency (%) of membrane was plotted. In this experiment, dye molecules from a 0.3 g.L−1 dye solution (250 ml) with a pH of 7.1 at 20°C were taken up by 0.06 g of the membrane. Insert shows the onion membrane in swollen and dye-adsorbed state.
Mentions: The adsorption performance of the onion membrane was evaluated by a batch equilibration technique as a function of time. As shown in Figure 3, the adsorption capacity of MB ions on the membrane increased rapidly during the first hour of contact and then became slower until equilibrium was reached after eight hours (480 min). The maximum adsorption was 1.055 g.g−1 with 84.45% efficiency after the first hour and 1.202 g.g−1 with 96.20% efficiency after eight hours. This behavior can be attributed to the larger surface area of the onion membrane at the initial stage of the adsorption process. Subsequently, as the surface sites became saturated, adsorption did not increase significantly with further contact time.Figure 3

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.