Fly ash and red mud have been employed as adsorbents for
the removal of methylene blue dye from aqueous solutions by
Wang et al. [285]. It was found that fly ash generally showed
higher adsorption capacity than red mud. The adsorption capacity
of 1.4 × 10−5 and 7.8 × 10−6 mol/g, for raw fly ash and red
mud, respectively, have been reported. Red mud was explored as
low-cost adsorbent for the removal of phenol, 2-chlorophenol, 4-
chlorophenol, and 2,4-dichlorophenol from wastewater by Gupta
et al. [286]. It was reported that 2,4-dichlorophenol and 4-
chlorophenol were adsorbed by the developed adsorbent up to
94–97%, while the removal of 2-chlorophenol and phenol was
up to 50–81%. The order of removal was 2,4-dichlorophenol > 4-
chlorophenol > 2-chlorophenol > phenol. It was suggested by them
that the removal of phenols took place through a particle diffusion
mechanism. The adsorption was found to be endothermic
Fly ash and red mud have been employed as adsorbents forthe removal of methylene blue dye from aqueous solutions byWang et al. [285]. It was found that fly ash generally showedhigher adsorption capacity than red mud. The adsorption capacityof 1.4 × 10−5 and 7.8 × 10−6 mol/g, for raw fly ash and redmud, respectively, have been reported. Red mud was explored aslow-cost adsorbent for the removal of phenol, 2-chlorophenol, 4-chlorophenol, and 2,4-dichlorophenol from wastewater by Guptaet al. [286]. It was reported that 2,4-dichlorophenol and 4-chlorophenol were adsorbed by the developed adsorbent up to94–97%, while the removal of 2-chlorophenol and phenol wasup to 50–81%. The order of removal was 2,4-dichlorophenol > 4-chlorophenol > 2-chlorophenol > phenol. It was suggested by themthat the removal of phenols took place through a particle diffusionmechanism. The adsorption was found to be endothermic
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