Limits...
Synthesis, modification and graft polymerization of magnetic nano particles for PAH removal in contaminated water.

Torabian A, Panahi HA, Nabi Bid Hendi GR, Mehrdadi N - J Environ Health Sci Eng (2014)

Bottom Line: The modified MNPs were characterized by transmission electron microscopy, infrared spectroscopy and thermogravimetric analysis.Analysis of the adsorption-desorption process indicated that the modified MNPs had a high level of stability and good reusability.Magnetic separation in these tests was fast and this shows that the modified MNPs have great potential to be used as a new adsorbent for the two PAHs removal from contaminated water in water treatment.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Environmental Engineering, University of Tehran, Tehran, Iran ; Department of Chemistry, Islamic Azad University, Tehran, Iran.

ABSTRACT
Magnetic nanoparticles (MNPs) were modified with 3-Mercaptopropytrimethoxysiline (MPTMS) and grafted with allyl glycidyl ether for coupling with beta naphtol as a method to form a novel nano-adsorbent to remove two poly aromatic hydrocarbons (PAHs) from contaminated water. The modified MNPs were characterized by transmission electron microscopy, infrared spectroscopy and thermogravimetric analysis. Results showed that the modified MNPs enhanced the process of adsorption. Tests were done on the adsorption capacity of the two PAHs on grafted MNPs; factors applied to the tests were temperature, contact time, pH, salinity and initial concentration of PAHs. Results revealed that adsorption equilibrium was achieved in 10 min, and the maximum adsorption capacity was determined as 4.15 mg/g at pH = 7.0 and 20°C. The equilibrium adsorption data of the two PAHs by the modified MNPs were analyzed by Langmuir, Freundlich and Temkin models. Equilibrium adsorption data was determined from the Langmuir, Freundlich and Temkin constants from tests under conditions of pH = 7 and temperature 20°C. Analysis of the adsorption-desorption process indicated that the modified MNPs had a high level of stability and good reusability. Magnetic separation in these tests was fast and this shows that the modified MNPs have great potential to be used as a new adsorbent for the two PAHs removal from contaminated water in water treatment.

No MeSH data available.


Related in: MedlinePlus

Effect of pH on adsorption of ANT/PYR on CGMMNPs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
getmorefigures.php?uid=PMC4120718&req=5

Figure 5: Effect of pH on adsorption of ANT/PYR on CGMMNPs.

Mentions: The effect of pH was studied at the range of (4–8) with the initial concentration of 20 μg/ L. As shown in Figure 5 pH had a minor effect. A suitable pH value can improve adsorption efficiency and reduce matrix interference. The removal of ANT/PYR in solution decreased according to an increased pH of the aqueous solution from 4 to 5. The optimum pH for adsorption was 7, suggesting that a neutral pH was ideal for the adsorption process. This can be explained by the different solubility of ANT and PYR in various pH. No precipitation occurred at this pH level. A pH level above 8 was not considered because of the possibility for dissolving and decomposing MNPs.


Synthesis, modification and graft polymerization of magnetic nano particles for PAH removal in contaminated water.

Torabian A, Panahi HA, Nabi Bid Hendi GR, Mehrdadi N - J Environ Health Sci Eng (2014)

Effect of pH on adsorption of ANT/PYR on CGMMNPs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4120718&req=5

Figure 5: Effect of pH on adsorption of ANT/PYR on CGMMNPs.
Mentions: The effect of pH was studied at the range of (4–8) with the initial concentration of 20 μg/ L. As shown in Figure 5 pH had a minor effect. A suitable pH value can improve adsorption efficiency and reduce matrix interference. The removal of ANT/PYR in solution decreased according to an increased pH of the aqueous solution from 4 to 5. The optimum pH for adsorption was 7, suggesting that a neutral pH was ideal for the adsorption process. This can be explained by the different solubility of ANT and PYR in various pH. No precipitation occurred at this pH level. A pH level above 8 was not considered because of the possibility for dissolving and decomposing MNPs.

Bottom Line: The modified MNPs were characterized by transmission electron microscopy, infrared spectroscopy and thermogravimetric analysis.Analysis of the adsorption-desorption process indicated that the modified MNPs had a high level of stability and good reusability.Magnetic separation in these tests was fast and this shows that the modified MNPs have great potential to be used as a new adsorbent for the two PAHs removal from contaminated water in water treatment.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Environmental Engineering, University of Tehran, Tehran, Iran ; Department of Chemistry, Islamic Azad University, Tehran, Iran.

ABSTRACT
Magnetic nanoparticles (MNPs) were modified with 3-Mercaptopropytrimethoxysiline (MPTMS) and grafted with allyl glycidyl ether for coupling with beta naphtol as a method to form a novel nano-adsorbent to remove two poly aromatic hydrocarbons (PAHs) from contaminated water. The modified MNPs were characterized by transmission electron microscopy, infrared spectroscopy and thermogravimetric analysis. Results showed that the modified MNPs enhanced the process of adsorption. Tests were done on the adsorption capacity of the two PAHs on grafted MNPs; factors applied to the tests were temperature, contact time, pH, salinity and initial concentration of PAHs. Results revealed that adsorption equilibrium was achieved in 10 min, and the maximum adsorption capacity was determined as 4.15 mg/g at pH = 7.0 and 20°C. The equilibrium adsorption data of the two PAHs by the modified MNPs were analyzed by Langmuir, Freundlich and Temkin models. Equilibrium adsorption data was determined from the Langmuir, Freundlich and Temkin constants from tests under conditions of pH = 7 and temperature 20°C. Analysis of the adsorption-desorption process indicated that the modified MNPs had a high level of stability and good reusability. Magnetic separation in these tests was fast and this shows that the modified MNPs have great potential to be used as a new adsorbent for the two PAHs removal from contaminated water in water treatment.

No MeSH data available.


Related in: MedlinePlus