Abstract
This study was carried out to evaluate the environmental application of modified and nonmodified carbon nanotubes through the experiment removal of chromium trivalent (III) from water. The aim was to find the optimal condition of the chromium (III) removal from water under different treatment conditions of pH, adsorbent dosage, contact time and agitation speed. Multi wall carbon nanotubes (MW‐CNTs) were characterized by field emission scanning electron microscopy (FE‐SEM) and transmission electron microscopy (TEM). The diameter of the carbon nanotubes produced varied from 20–40 nm with average diameter of 24 nm and 10 micrometer in length. Adsorption isotherms were used to model the adsorption behavior and to calculate the adsorption capacity of the absorbents. The results showed that, 18% of chromium (III) removal was achieved using modified carbon nanotubes (M‐CNTs) at pH 7, 150 rpm, and 2 hours for a dosage of 150 mg of CNTs. The removal of Cr (III) is mainly attributed to the affinity of chromium (III) to the physical and chemical properties of the CNTs. The adsorption isotherms plots were well fitted with experimental data.
Highlights
The pollution of water resources due to the disposal of heavy metals has been causing worldwide concern
High purity of multi wall carbon nanotubes were produced by chemical vapor deposition (CVD) technique
The produced carbon nanotubes were observed by suing field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM)
Summary
The pollution of water resources due to the disposal of heavy metals has been causing worldwide concern. Carbon nanotubes (CNTs), a member in carbon family, have novel properties that make them potentially useful in many applications in Journal of Nanomaterials nanotechnology, electronics, optics, water treatment, and other fields of materials science. Multiwalled carbon nanotubes (MWCNT) were previously used for removal of metal ions, such as lead, copper, cadmium, silver, and nickel [17]. In this work the effect of modified and nonmodified carbon nanotubes were used to study the effect of these nanomaterilas on the removal the chromium (III) from water The process parameters such as pH, dosage of MWCNTs, agitation speed and contact time were investigated in order to maximize the removal of Cr (III)
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