Kinetics and thermodynamic study of aniline adsorption by multi-walled carbon nanotubes from aqueous solution

Synthesis and properties of Fe3O4-activated carbon magnetic nanoparticles for removal of aniline from aqueous solution: equilibrium, kinetic and thermodynamic studies

“…It also shows that the amounts of calculated capacity (q e,cal ) in the pseudo second order model rather than the pseudo first order model were more closer and consistent with adsorption capacity obtained from experiments(q e,exp ). According to previous studies, this result suggests that the adsorption behavior of aniline by the studied adsorbent per time unit follows from pseudo second order model and it indicates that the rate-limiting step in aniline adsorption process may be chemisorptions [30,31]. …”

“…Al-Johani et al (2011) and Tang et al (2012) in study of aniline removal by carbon nanotube and activated carbon were reported decrease of adsorption efficiency with increasing of temperature [24,30]. Therefore, decreasing the removal efficiency with increasing temperature indicates that aniline adsorption on AC-Fe 3 O 4 magnetic nanoparticles is exothermic.…”

Methylene blue adsorption onto granular activated carbon prepared from Harmal seeds residue

“…The probability of intraparticle diffusion can be explored by using the intraparticle diffusion model [54]. The intraparticle diffusion model is expressed by:…”

“…This confirms that the adsorption of MB by the prepared activated carbon is a multi-step process and involved adsorption to the external surface and diffusion into the pores of the Harmal seeds residue-based activated carbon. The mechanism of MB removal by adsorption is assumed to involve the following steps: (1) migration of MB from the bulk solution to the external surface of adsorbent; (2) diffusion of MB through the boundary layer to the external surface of adsorbent; (3) adsorption of MB at an active site on the surface of adsorbent; and (4) intraparticle diffusion and adsorption of MB through the Harmal seeds residue activated carbon particles [54]. Table 3 presents a comparison of adsorption capacities of MB on a commercial activated carbon and the activated carbon derived from Harmal seeds residue (this work) and other agricultural and industrial wastes.…”

Modification and application of multiwalled carbon nanobutes for the separation of arsenic from water

“…Za određivanje slobodnih površina na adsorbentu, bez nataloženog gvožđa (goetita), iskorišćeno je svojstvo jakog afiniteta MWCNTs za adsorpciju policikličnih aromatičnih ugljovodonika [308] i anilina [309], jer modifikovane MWCNTs mogu da adsorbuju nepolarne [308] i polarne [310] aromatične molekule, u zavisnosti od svojih površinskih osobina. Kvantitativnom procenom hidrofobnosti površine, dobija se koristan pokazatelj slobodnih površina adsorbenta, koje nisu uključene u proces adsorpcije As(V) iz vodenog rastvora.…”