Removal of sudan dyes from aqueous solution by magnetic carbon nanotubes: Equilibrium, kinetic and thermodynamic studies

Adsorption of Sudan-IV contained in oily wastewater on lipophilic activated carbons: kinetic and isotherm modelling

“…To the best of our knowledge, there is only one work dealing with the adsorption of S-IV for treatment of wastewater (Sun et al 2015). In that report, the kinetic adsorption on magnetic carbon nanotubes was assessed by applying the pseudo-first-and pseudo-second-order model and the kinetic coefficients were slightly higher than the values obtained here (k f = 0.063 min −1 and k s = 1.022 g mg −1 min −1 ).…”

“…In a previous work, we have shown the effect of several operating conditions (pH, water/oil ratio, particle size, initial pollutant concentration and the presence of an emulsifier) on the adsorption of Sudan-IV (S-IV), a high-lipophilic model Responsible editor: Tito Roberto Cadaval Jr Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-08473-1) contains supplementary material, which is available to authorized users. pollutant with toxic hazards properties (Noguerol-Cal et al 2008;Sun et al 2015), using modified activated carbons and a biphasic mixture cyclohexane-water in order to simulate contaminated oily wastewater (Diaz de Tuesta et al 2018). In that study, it was found that the water/oil (W/O) ratio has no effect on the adsorption process, as consequence of the lipophilic character of the pollutant (not detected in the aqueous phase) and the characteristics of the modified activated carbons used (preferentially found in the oil phase).…”

The Nanosized Dye Adsorbents for Water Treatment

“…Fe 3 O 4 nanoparticles show optimum chemical stability, monodisperse particle size, and biocompatibility, and can act as a complementary unit alongside the CNTs, which allows their magnetic recovery. Sun et al [113] employed Fe 3 O 4 /CNTs for the adsorption-based removal of sudan I-IV dyes from water. In addition, Duman et al [110] developed magnetic oxidized multi-walled carbon nanotube (OMWCNT)-Fe 3 O 4 and OMWCNT-κ-carrageenan-Fe 3 O 4 nanocomposites and employed them for the adsorption of MB.…”

Removal of Sudan IV from a simulated biphasic oily wastewater by using lipophilic carbon adsorbents

“…The current work is focused on the removal of a lipophilic pollutant (Sudan IV) from a biphasic medium oil-water (simulating contaminated oil mixtures with water) by using different modified activated carbons as adsorbents. To the best of our knowledge, we are reporting for the first time an improved strategy for the modification of activated carbons to increase the removal of Sudan IV (S-IV) used as N-containing target pollutant (C 24 H 20 N 4 O), a well-known lipophilic dye contaminant with toxic hazards properties [11,12]. Sudan dyes are harmful colouring additives widely used in fuels, waxes, plastics, floor and shoe polishes, whose discharge into water could cause environmental hazards [11].…”

“…To the best of our knowledge, we are reporting for the first time an improved strategy for the modification of activated carbons to increase the removal of Sudan IV (S-IV) used as N-containing target pollutant (C 24 H 20 N 4 O), a well-known lipophilic dye contaminant with toxic hazards properties [11,12]. Sudan dyes are harmful colouring additives widely used in fuels, waxes, plastics, floor and shoe polishes, whose discharge into water could cause environmental hazards [11]. Furthermore, S-IV was selected as target pollutant owing its hazard properties and the strong lipophilic character (it is preferentially found in the oil phase) that make it a good candidate to evaluate the recovering of the desirable organic phase contaminated with N-containing substances.…”