Adsorption behaviors of heavy metal ions onto electrochemically oxidized activated carbon fibers

Investigation of factors affecting adsorption of transition metals on oxidized carbon nanotubes

“…Another factor is the accessibility of centers, which also can be linked to the sizes of species to be adsorbed and their effective charge. According to Park and Kim [4] and Horsfall and Spiff [41], the adsorption of heavy metal ions should depend on the ionic radius of adsorbate. The large ionic radius should cause a quick saturation of adsorption sites because of steric effects.…”

“…Chemical precipitation or electrochemical methods can be used to remove heavy metals present in high concentrations in aqueous phase. On the other hand, at low concentrations, such pollutants can be removed by adsorption on activated carbons and other adsorbents [1][2][3][4][5]. Recently, carbon nanotubes (CNTs), have attracted great interest due to their unique morphologies leading to potential applications.…”

Adsorption of lead(II) from aqueous solution onto several types of activated carbon fibers

“…The adsorption of Cd(II), Cu(II), Hg(II), Ni(II) and Zn(II) from water solution on ACFs has been investigated in several works (Alvarez-Merino et al 2005;Babic et al 2002;Faur-Brasquet et al 2002a, 2002bHarry et al 2006;Kadirvelu et al 2000;Ko et al 2004;Leyva-Ramos et al 2005;Park and Kim 2005;Rangel-Mendez and Streat 2002;Shim et al 2001). It has been found that the capacities of the ACFs for adsorbing heavy metals were enhanced by increasing the pH and was highly dependent on the surface properties of the ACFs, particularly, the acidic sites.…”

Equilibrium and kinetics of heavy metal ion exchange

“…Sometimes, treating heavy metal sludge is more difficult than treating heavy metal-containing wastewaters. Therefore, other methods such as electrodialysis (Mohammadi et al, 2004(Mohammadi et al, , 2005Schlichter et al, 2004), reverse osmosis (Kryvoruchko et al, 2004;Ujang and Anderson, 1998), biosorption including some economic bio-adsorbent (Aksu and Dönmez, 2001;Bhattacharyya and Sharma, 2004;Evans et al, 2002;Kapoor and Viraraghavan, 1998;Sag and Kutsal, 1995;Tarley and Arruda, 2004), adsorption (Choi et al, 2006;Lyubchik et al, 2004;Park and Kim, 2005;Suh and Kim, 2000;Yu et al, 2000), and ion exchange process are developed to remove heavy metals from industrial wastewaters.…”