Facile synthesis of multiwall carbon nanotubes/iron oxides for removal of tetrabromobisphenol A and Pb(ii)

Abstract

A one-step thermal decomposition strategy, in which a novel reductant participated, was developed to prepare superparamagnetic nearly cubic monodisperse Fe 3 O 4 nanoparticles loaded on multiwall carbon nanotubes (MWCNTs/Fe 3 O 4 ). Subsequently, the as-prepared MWCNTs/Fe 3 O 4 nanocomposites were modified with 3-aminopropyltriethoxysilane (APTS) (MWCNTs/Fe 3 O 4 -NH 2 ). The materials were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometry (VSM) and the BET surface area method. The results indicated that superparamagnetic Fe 3 O 4 nanoparticles were successfully loaded onto the surface of the MWCNTs, and APTS was also modified on the MWCNTs/Fe 3 O 4 magnetic nanocomposites. The two as-prepared magnetic nanocomposites were used as adsorbents to remove tetrabromobisphenol A (TBBPA) and Pb(II) from wastewater. The adsorption kinetics and adsorption isotherms of TBBPA and Pb(II) on the two asprepared adsorbents were studied at pH 7.0 and 5.3, respectively. It was revealed that MWCNTs/ Fe 3 O 4 -NH 2 performed better than the MWCNTs/Fe 3 O 4 nanocomposites for the adsorption properties of TBBPA and Pb(II). After adsorption, both adsorbents could be conveniently separated from the media by an external magnetic field within several seconds, and regenerated in 0.1 M NaOH solution.

Kinetic and thermodynamic investigation into the lead adsorption process from wastewater through magnetic nanocomposite Fe3O4/CNT

“…It is clear from Table 4 that the adsorption capacity of Fe 3 O 4 /CNT magnetic nanocomposite was comparable to the previously reported capacities [18,[30][31][32][33][34].…”

A facile approach to the fabrication of rattle-type magnetic carbon nanospheres for removal of methylene blue in water

“…6), the relatively strong reflection peaks at 2h = 30.0°, 35.5°, 43.2°, 53.8°, 57.2°, and 62.6°were ascribed to the (2 2 0), (3 1 1), (4 0 0), (4 2 2), (5 1 1), and (4 4 0) planes, which was in good agreement with the database of magnetite (JCPDS 65-3107). These data indicated that the Fe 3 O 4 had been successfully coated with SiO 2 and RF shells, resulting in a highly crystalline cubic spinel structure [37,38]. In Fig.…”

Engineered nanomaterials for water treatment and remediation: Costs, benefits, and applicability

“…A combined coagulation-adsorption technique for removing EDCs was recently employed using SWCNT, MWCNTs, and powdered activated carbon but the results were similar to using adsorption alone [369]. C-ENMs have been shown to adsorb PPCPs such as bisphenol A [366,368,371], doxycycline hydrochloride [367], TBBPA [269], triclosan [372], ciprofloxacin [373], oxytetracycline [367,374], carbamazepine [375], norfloxacin [376], ibruprofen [372], and natural and synthetic estradiols [366,371,377]. Removal of EDCs by carbon-based ENMs is strongly dependent on the physicochemical properties of target pollutants such as aromaticity [367], octanol-water partitioning (K ow ) [366,371], sorbate concentration, and presence of natural organic matter (NOM) [372,378].…”

“…Nano-based techniques may thus become very important, especially for the removal of emerging pollutants and low levels of contaminants. In contrast to traditional technologies the effectiveness of many nano-based methods can be improved via particle modification [269,339,385,399], and their cost may be lowered by industrial-scale production and the development of synthesis methods that consider cheaper feedstock and less energy. In addition, many nano-based technologies allow for reuse, often require lesser amount of space, can offer reduced toxic intermediate formation, and are adaptable to support the emerging concept of water treatment decentralization [10,11,500].…”