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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 initial dyes concentration on the MB adsorption capacity (g.g−1) and efficiency (%) of membrane was plotted. In these experiments, 0.06 g of the membrane adsorbed dye molecules from a dye solution (250 ml) with a pH of 7.1 at 20°C for 8 hours.
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Fig7: Effect of initial dyes concentration on the MB adsorption capacity (g.g−1) and efficiency (%) of membrane was plotted. In these experiments, 0.06 g of the membrane adsorbed dye molecules from a dye solution (250 ml) with a pH of 7.1 at 20°C for 8 hours.

Mentions: Figure 7 shows the maximum capacity of an onion membrane in the adsorption of MB using adsorbent-adsorbate solutions with different initial dye concentrations (0.1-0.9 g.L−1). It is clear that the MB adsorption capacity of an onion membrane increases with an increase in the initial concentration of the solution. This is most likely due to a greater availability of adsorbate ions in the vicinity of the onion membrane and a high driving force for mass transfer before the adsorption-desorption equilibrium was reached [25]. However, in this study, unlike the adsorption amount and capacity, the efficiency of the dye removal decreased, which may be attributed to the saturation of adsorption sites on the adsorbent surface [9]. The maximum MB adsorption capacity of an onion membrane is 1.9230 g.g−1 with the lowest efficiency at 51.28%, which is significantly higher than the other adsorbents [26-29] listed in Figure 8.Figure 7


Onion membrane: an efficient adsorbent for decoloring of wastewater.

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

Effect of initial dyes concentration on the MB adsorption capacity (g.g−1) and efficiency (%) of membrane was plotted. In these experiments, 0.06 g of the membrane adsorbed dye molecules from a dye solution (250 ml) with a pH of 7.1 at 20°C for 8 hours.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig7: Effect of initial dyes concentration on the MB adsorption capacity (g.g−1) and efficiency (%) of membrane was plotted. In these experiments, 0.06 g of the membrane adsorbed dye molecules from a dye solution (250 ml) with a pH of 7.1 at 20°C for 8 hours.
Mentions: Figure 7 shows the maximum capacity of an onion membrane in the adsorption of MB using adsorbent-adsorbate solutions with different initial dye concentrations (0.1-0.9 g.L−1). It is clear that the MB adsorption capacity of an onion membrane increases with an increase in the initial concentration of the solution. This is most likely due to a greater availability of adsorbate ions in the vicinity of the onion membrane and a high driving force for mass transfer before the adsorption-desorption equilibrium was reached [25]. However, in this study, unlike the adsorption amount and capacity, the efficiency of the dye removal decreased, which may be attributed to the saturation of adsorption sites on the adsorbent surface [9]. The maximum MB adsorption capacity of an onion membrane is 1.9230 g.g−1 with the lowest efficiency at 51.28%, which is significantly higher than the other adsorbents [26-29] listed in Figure 8.Figure 7

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.