Abstract
Multi-walled and single-walled carbon nanotubes were used as adsorbents for the removal of Reactive Blue 4 textile dye from aqueous solutions. The adsorbents were characterised using Raman spectroscopy, N2 adsorption/desorption isotherms and scanning and transmission electron microscopy. The effects of pH, agitation time and temperature on adsorption capacity were studied. In the acidic pH region, the adsorption of the dye was favourable using both adsorbents. The contact time to obtain equilibrium isotherms at 298-323 K was fixed at 4 hours for both adsorbents. For Reactive Blue 4 dye, Liu isotherm model gave the best fit for the equilibrium data. The maximum sorption capacity for adsorption of the dye occurred at 323 K, attaining values of 502.5 and 567.7 mg g-1 for MWCNT and SWCNT, respectively.
Highlights
Many industries use dyes for colouring their final products
R2 adj and Ferror are given in Equations 6 and 7, respectively: Adsorption studies for the evaluation of the capacity of multiwalled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes (SWCNTs) adsorbents for the removal of Reactive Blue 4 (RB-4) dye from aqueous solutions were carried out in triplicate using a batch contact adsorption method[18]
Taking into account the differences in SWCNTs and MWCNTs, the obtained results reported in Table 2 are in agreement with the expected data[20]
Summary
Many industries use dyes for colouring their final products. It has been estimated that about 10,000 different synthetic dyes and pigments exist and that over 7×105 tonnes are produced annually worldwide[1]. Effluents containing dyes require treatment before being released into the environment[1,2,3,4]. The most efficient method for the removal of synthetic dyes from aqueous effluents is the adsorption process[6,7]. This process transfers dyes from the water effluent to a solid phase and remarkably decreases dye bioavailability to living organisms[3]. The decontaminated effluents could be subsequently released to the environment, or the water could be reutilised in industrial processes. Different adsorbents have been used for the removal of dyes from aqueous solutions[4,6,7,8].
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