Sorption of Copper(II) from Aqueous Solution by Peat

Abstract

Abstract. The use of peat for removal of copper(II) from aqueous solution has been investigated at various initial copper ion concentrations and masses of peat. The equilibrium sorption study can be described by the Langmuir equation and defined in terms of the operating lines for each batch contacting system. The mechanisms of the rate of sorption of copper(II) were analysed using the Elovich equation and a pseudo-second-order model. Both rate mechanisms provided a very high degree of correlation of the experimental sorption rate data suggesting either model could be used in design applications.

Application of maghemite nanoparticles as sorbents for the removal of Cu(II), Mn(II) and U(VI) ions from aqueous solution in acid mine drainage conditions

“…Similar rapidity of reaction rates was also reported by Chang and Chen (2005) and Banerjee and Chen (2007). Reaction kinetics were best described by the pseudosecond-order model ( Table 1), implying that the binding of metal ions to the maghemite surface was by chemisorption (Ho and Mckay 2004). Further, the fit of data to the intraparticle diffusion model was poor (R 2 B 0.11).…”

“…Adsorption enhancement in the presence of Mn was likely due to a greater diffusion drive for mass transfer to the adsorbent surface (Ho and Mckay 2004). Driving forces for diffusion of ions towards the adsorbent surface are greater at high ion concentrations, hence increased adsorption.…”

“…4a-c that NP loading (q e ) increased with increasing metal concentrations. These increases can be explained by the greater driving force for mass transfer as ion concentrations in solution increase (Ho and Mckay 2004).…”

“…3), pseudo-second-order model (Eq. 4) (Ho and Mckay 2004), and the intraparticle diffusion model (Eq. 5) (Weber and Morris 1963).…”

Lignite fired fly ash modified by chemical treatment for adsorption of zinc from aqueous solution

“…Replacing synthetic substrates with low-cost adsorbents has, therefore, been intensively studied, and there have been reports of the use of materials obtained from agriculture and from forest wastes, for example bagasse fly ash [12], sugar beet pulp [13], activated carbon derived from bagasse [14], maple sawdust [15], clay [16,17], volcanic ash bone char [18], humus [19], or bituminous coal, for removal of heavy metals. Removal of heavy metals (cadmium, copper, zinc, and nickel) on scrap rubber, bituminous coal, peat [20], and natural zeolite [21] has also been reported.…”