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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

TEM photograph of CGMMNPs.
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Figure 4: TEM photograph of CGMMNPs.

Mentions: The CGMMNPs were characterized by FT-IR, TGA and TEM. The FT-IR spectrum of CGMMNPs was compared with raw MNPs as well as FT- IR; (NaCl, cm−1) 3779.8 (OH), 1627 (C=O), 1450 (aromatic cycle), 3051.53 (aromatic C-H) and 1000 (C–O). The presence of aromatic group by FT-IR spectrum of CGMMNPs indicates that the coupling of 2-naphtol was successful. The TGA of unmodified MNPs indicated a weight loss of up to 120°C, and this can be attributed to desorption of the water molecules from the surface at temperature higher than 200°C the weight remained constant. GMNPs however showed completely different thermal behavior. Weight loss up to the temperature of 200°C was due to the presence of water molecules in the grafted MNPs and weight loss at 220–500°C was caused by decomposition and desorption of the polymeric matrix Figure 3. These results demonstrate the formation of CGMMNPs. Briefly, FT-IR spectrum and TGA confirmed the structure of the grafted polymer as presented in Figure 2. TEM was used to examine the external surface of the CGMMNPs. As indicated in Figure 4 the particles were spherical with a rough surface and particle size was 15–40 nm.


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)

TEM photograph of CGMMNPs.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: TEM photograph of CGMMNPs.
Mentions: The CGMMNPs were characterized by FT-IR, TGA and TEM. The FT-IR spectrum of CGMMNPs was compared with raw MNPs as well as FT- IR; (NaCl, cm−1) 3779.8 (OH), 1627 (C=O), 1450 (aromatic cycle), 3051.53 (aromatic C-H) and 1000 (C–O). The presence of aromatic group by FT-IR spectrum of CGMMNPs indicates that the coupling of 2-naphtol was successful. The TGA of unmodified MNPs indicated a weight loss of up to 120°C, and this can be attributed to desorption of the water molecules from the surface at temperature higher than 200°C the weight remained constant. GMNPs however showed completely different thermal behavior. Weight loss up to the temperature of 200°C was due to the presence of water molecules in the grafted MNPs and weight loss at 220–500°C was caused by decomposition and desorption of the polymeric matrix Figure 3. These results demonstrate the formation of CGMMNPs. Briefly, FT-IR spectrum and TGA confirmed the structure of the grafted polymer as presented in Figure 2. TEM was used to examine the external surface of the CGMMNPs. As indicated in Figure 4 the particles were spherical with a rough surface and particle size was 15–40 nm.

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