Bromate Removal from Water Using Doped Iron Nanoparticles on Multiwalled Carbon Nanotubes (CNTS)

Abstract

The raw carbon nanotubes (CNTs) were prepared by the floating catalyst chemical vapor deposition method. The raw carbon nanotubes were functionalized, impregnated with iron nanoparticles, and characterized using high resolution transmission electron microscopy (HRTEM), scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), and thermogravimetric analysis (TGA). The three types of these multiwalled carbon nanotubes were applied as adsorbents for the removal of bromate from drinking water. The effects of the pH, the concentration ofBrO3-anion, the adsorbent dose, the contact time, and the coanions on the adsorption process have been investigated. The results concluded that the highest adsorption capacities were 0.3460 and 0.3220 mg/g through using CNTs-Fe and raw CNTs, respectively, at the same conditions. The results showed that the CNTs-Fe gives higher adsorption capacity compared with the raw CNTs and the functionalized CNTs. The presence of nitrate (NO3-) in the solution decreases the adsorption capacity of all CNTs compared with chloride (Cl-) associated with pH adjustment caused by nitric acid or hydrochloric acid, respectively. However, the adsorption of all MWNCTs types increases as the pH of solution decreases.

Phytotoxicity of ionic, micro- and nano-sized iron in three plant species

“…Further applications are currently focused on environmental remediation due to their likely performance in contamination removal and toxicity mitigation (Gavaskar et al, 2005;Tratnyek and Johnson, 2006). Ironbased ENPs stimulated research for engineering applications especially for treating polluted water and groundwater (Tang and Lo, 2013) including both inorganics and organics (Crane and Scott, 2014;Mar Gil-Díaz et al, 2014;Zeino et al, 2014). Their impact is still highly empirical and limited to nanoparticles' elemental composition, size and stability showing both positive and negative effects.…”

Adsorption of Bromate From Aqueous Solutions by Modified Granular Activated Carbon: Batch and Column Tests

“…The second main strategy, i.e., removal of bromate by adsorption, has become a prominent research topic recently due to its convenience and low cost, and many kinds of material have been tested. These include carbon-based materials, such as ordered mesoporous carbon (Xu et al 2014), doped iron nanoparticles on multi-walled carbon nanotubes (Zeino et al 2014), and nanoscale zero-valent iron supported on modified activated carbon (Wu et al 2013). However, most of these absorbents are relatively expensive and have limited potential for application.…”

Benzene Removal by Iron Oxide Nanoparticles Decorated Carbon Nanotubes

“…It was observed that, with increase in the adsorbent dosage, the adsorption efficiency has increased. This can be justified due to the availability of more active adsorption sites at higher adsorbent dosage [17,26]. Figure 9 represents the pH effect on removal efficiency and adsorption capacity of iron oxide nanoparticles impregnated CNTs.…”

“…The most common materials reported are activated carbon [4], raw carbon nanotubes [13], and modified carbon nanotubes [14][15][16] for removal of BTEX. Recently, metal oxide impregnated CNTs have shown better adsorption capacity and removal efficiency as compared to raw CNTs and other adsorbents for different pollutants [17][18][19][20][21][22]. Novel carbon nanotube membranes are also appealing candidates for a number of applications in water treatment [23,24].…”