Adsorption of cadmium on husk of Lathyrus sativus: Physico-chemical study

Cadmium resistance mechanism in Escherichia coli P4 and its potential use to bioremediate environmental cadmium

“…The optimum pH for Cd +2 adsorption was found to be 6 at which E. coli P4 showed maximum adsorption (24 %). At low pH, negatively charged sites on bacterial surface become positive and repel Cd +2 (Panda et al 2006), thus lowering the adsorption and metal removal capability of bacteria. At neutral pH, adsorption of Cd +2 is at maximum due to the presence of free negatively charged functional groups.…”

“…At neutral pH, adsorption of Cd +2 is at maximum due to the presence of free negatively charged functional groups. Above pH 7, Cd +2 exist either in the form of [Cd(OH) 3 ] − or [Cd(OH) 4 ] − and thus repelled by the negatively charged bacterial surface (Panda et al 2006). High temperature influences the biosorption ability of bacteria by increasing the kinetic energy of reacting molecules as well as vibrational energy of constituent elements of bacterial envelops.…”

Biosorption of lead(II) onto pine cone powder: Studies on biosorption performance and process design to minimize biosorbent mass

“…Of these models the frequently used are: the pseudo-first order and pseudo-second order (Jacques, Lima, Dias, Mazzocato, & Pavan, 2007;Panda et al, 2006;Schiewer & Patil, 2007;Singh, Talat, & Hasan, 2006;Zulkali, Ahmad, & Norulakmal, 2006), modified pseudo-first order model (Ofomaja, Naidoo, & Modise, 2010a;Unuabonah, Adebowale, & Ofomaja, 2009;Unuabonah, Adie, Onah, & Adeyemi, 2009;Yang & Al-Duri, 2005) and the Elovich model (Ho & McKay, 1998a, 1998b, 1998cÖrnek, Özacar, & Ş engil, 2007;Özacar & Ş engil, 2005). The kinetic parameters for these models have been reported for the various biosorbents in literature but little or nothing is mentioned about how these kinetic parameters predict the biosorption performance of the biosorbent or how modification of these biosorbent affect the biosorption performance.…”

Determination of sorbent point zero charge: usefulness in sorption studies

“…In literature, different mechanisms have been proposed for divalent metal sorption onto vegetable wastes: complexation reactions (Dupont et al 2004), ionic exchange (Gérente et al 2000;Villaescusa et al 2004) and microprecipitation (Panda et al 2006). It is well known that pH has a great importance in cation sorption because it influences chemical speciation of the metal in solution and also on the ionization of chemically active sites on the sorbent.…”