Abstract
Novel magnetic nanoparticles (MNPs) modified with (3-mercaptopropyl)-trimethoxysilane (MPTMS), grafted with allyl glycidyl ether and coupled with beta naphthol, were prepared for removal of anthracene in aqueous solutions. The grafted MNPs were characterized by transmission electron microscopy (TEM), infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). The modified MNPs contributed to enhancement of the adsorption capacity and were prepared by co-precipitation. The modified MNPs were characterized by TEM, FT-IR and TGA and the adsorption and kinetic behavior of anthracene on the modified MNPs was examined. It was shown that the nano-adsorbent optimized adsorption capacity is at pH 7. Three kinetics models: pseudo-first-order, pseudo-second-order, and intraparticle diffusion were used to investigate the adsorption mechanism of the anthracene onto the modified MNPs. The best fit was obtained for the pseudo-second-order model. The synthesized nano adsorbent can be considered as a new method for anthracene adsorption in contaminated water with the benefit of fast removal by applying a magnetic field.
Highlights
Anthracene (ANT) is one of a group of chemicals called polycyclic aromatic hydrocarbons (PAHs)
The coupled-grafted-modified MNPs (CGMMNPs) were characterized by transmission electron microscopy (TEM), infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA)
The FT-IR spectrum for the CGMMNPs was compared with the raw magnetic nanoparticles (MNPs) as well as FT-IR: (NaCl, cm−1) 3779.8 (OH), 1627 (C=O), 1450, 3051.53 and 1000 (C–O).The presence of an aromatic group in the FT-IR spectrum of the CGMMNPs indicates that coupling of the 2-naphthol was performed successfully
Summary
Anthracene (ANT) is one of a group of chemicals called polycyclic aromatic hydrocarbons (PAHs). PAHs are often found in groups of two or more; they can exist in over 100 different combinations, but the most common are treated as a group of 15. PAHs are found naturally in the environment but can be man-made. ANT can vary in appearance from a colorless to pale yellow crystal-like solid. ANT, like other PAHs, are created when products like coal, oil, gas, and garbage are burned, but the burning process is not complete. ANT is used to make dyes, plastics, pesticides, smoke screens and scintillation counter crystals. Exposure of the skin to contaminated soil or products like heavy oils, coal tar, roofing tar, or creosote where PAHs have been found can have adverse health effects. ANT can spread and target fat tissues and organs, including the kidneys and liver
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