Vermiculite as an exchanger for copper(II) and Cr(III) ions, kinetic studies

Abstract

The adsorption of Cu(II) and Cr(III) ions by pure clay mineral, vermiculite, was examined in aqueous solution with respect to the adsorbent dose, initial metal ion concentration, pH, and contact time. The studies showed that vermiculite can be used as an adsorbent material for the moderate removal of Cr(III) and Cu(II) from aqueous solutions. Lagergren first-order, pseudo-second-order, and intraparticle diffusion models were used to describe the kinetic data. The kinetics of adsorption indicates that the process fitted well the intraparticle diffusion model.

Determination of adsorptive properties of expanded vermiculite for the removal of C. I. Basic Red 9 from aqueous solution: Kinetic, isotherm and thermodynamic studies

“…The use of vermiculite as an adsorbent has been studied for the removal of Hg(II) (Do Nascimento and Masini, 2014), Cr(III) (Badawy et al, 2010;Sis and Uysal, 2014), Cu(II) (Badawy et al, 2010), Pb(II) (Hongo et al, 2012;Sis and Uysal, 2014), Zn(II) (Sis and Uysal, 2014), Cs (Suzuki et al, 2013), Ag(I) (Sari and Tüzen, 2013), Cr(VI) (Dultz et al, 2012), Cd(II) (Panuccio et al, 2009), mineral and canola oils (Mysore et al, 2005), phthalate (Wen et al, 2013), basic cationic dye (Choi and Cho, 1996), herbicides 2,4-D, diuron, alachlor, metolachlor and triazine (de Rezende et al, 2011), dibenzothiophene (Froehner et al, 2010), benzodiazepine (Carvalho et al, 2014) and cationic surfactant cetylpyridinium chloride (Tarasevich et al, 2013) from aqueous solution. Although there are many works published about the adsorption of metal ions and organic compounds onto vermiculite, only one study has been carried out to determine the dye adsorption properties of vermiculite.…”

Effect of biotite content of hydrogels on enhanced removal of methylene blue from aqueous solution

“…The most widely employed adsorbent is activated carbon due to its pore structure, high efficiency, and adsorption capacity for some dyes, but the cost and difficulty in separation after adsorption hinder its large-scale application [5]. Several low-cost adsorbents such as vermiculite [6], hazelnut shell [7], and rice husk ash [8] have also been investigated for decontamination purpose; however, the adsorption capacities of these adsorbents were restricted. Therefore, many researchers have taken up with seeking for more effective adsorbents to eliminate these hazardous dyes from the effluent from the viewpoints of environment and scientific and technological importance.…”

Biosorption of nickel and cadmium in the presence of diethylketone by a Streptococcus equisimilis biofilm supported on vermiculite

“…The increase of t pH results in an increase of the hydroxyl groups and other anionic functional groups. This makes the bacterial surface more negative, the number of electrostatic repulsions decreases and the number of electrostatic attraction increases, resulting in an increase of metal sorption (Badawy et al, 2010).…”

“…Vermiculite can adsorb heavy metals by two distinct mechanisms: production of inner-sphere complexes through SieO À and AleO À groups at the vermiculite particle edges and cation exchange at the planar site. Since both mechanisms are pH-dependent and pH changes the vermiculite surface properties and the metal speciation, it is concluded that pH plays an important and crucial role in the control of cationic adsorption from aqueous solutions (Badawy et al, 2010).…”