Removal of metal ions from aqueous solution by activated carbons obtained from different raw materials

Budinova, T.; Petrov, N.; Minkova, V.; Gergova, K.

doi:10.1002/jctb.280600210

Cited by 104 publications

(35 citation statements)

References 6 publications

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“…A number of works have been carried out using activated carbon from hazelnut husk (Imamoglu and Tekir 2008), rice hulls (Teker et al 1999), apricot stones, coconut shells (Budinova et al 1994) and peanut hulls (Periasamy and Namasivayam 1994) for heavy metals removal. However, no attempt has been made to produce activated carbon using Ipomoea carnea plants for the removal of Cu(II) ions.…”

Section: Introductionmentioning

confidence: 99%

Chemically activated Ipomoea carnea as an adsorbent for the copper sorption from synthetic solutions

et al. 2010

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An indigenously prepared zinc chloride activated Ipomoea carnea (morning glory), a low-cost and abundant adsorbent, was used for removal of Cu(II) ions from aqueous solutions in a batch adsorption system. The chemical activating agent ZnCl 2 was dissolved in deionised water and then added to the adsorbent in two different ratios 1:1 and 1:0.5 adsorbent to activating agent ratio by weight. Studies were conducted as a function of contact time, initial metal concentration, dose of adsorbent, and pH. Activated Ipomoea carnea (AIC) were characterised using scanning electron microscopy (SEM), iodine number and methylene blue number. High iodine numbers indicates development of micro pores with zinc chloride activation. Maximum adsorption was noted within pH range 6.0(±0.05). Adsorption process is fast initially and reaches equilibrium after about 4 hours. The kinetic data were analysed using pseudo-first-order and pseudo-second-order models. The pseudo-second-order kinetic model was found to agree well with the experimental data. Adsorption equilibrium data were analyzed using Langmuir and Freundlich isotherm models. The Langmuir model represented the sorption process better than the Freundlich model. Based on the Langmuir isotherm, the monolayer adsorption capacity of Cu(II) ions was 7.855 mg g −1 for AIC (1:1) and 6.934 mg g −1 for AIC (1:0.5). Nomenclature aRadius of spherical adsorbent particles (m) C 0 Concentration of Cu 2+ before adsorption (mg/l) C e Equilibrium concentration of Cu 2+ in solution (mg/l) C r Concentration of Cu 2+ after adsorption (mg/l) D eff Effective diffusion coefficient (m 2 /s) D 2 Particle diffusion coefficient (m 2 /s) F Fractional attainment of equilibrium at time t K Freundlich constant representing multilayer adsorption capacity (mg/g) K f Pseudo first-order rate constant (min −1 ) K id Initial rate of intraparticle diffusion (mg/(g min 0.5 )) K L Langmuir constant representing adsorption intensity (l/mg) K s Pseudo second-order rate constant (g/mg min) M Mass of the adsorbent (g) n Freundlich constant representing adsorption intensity (g/l) q e Adsorption capacity at equilibrium (mg/g) q tAdsorption capacity at any time t (mg/g) Q 0 Langmuir constant representing maximum monolayer adsorption capacity (mg/g) 76 Adsorption (2010) 16: 75-84 R 2 Regression coefficient t Contact time (min) V Volume of adsorbate solution (l)

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Section: Introductionmentioning

confidence: 99%

Chemically activated Ipomoea carnea as an adsorbent for the copper sorption from synthetic solutions

et al. 2010

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“…The lead ions with smaller effective hydrated radii are able to diffuse into parts of the porous structure that are not easily accessible by the larger hydrated copper ions, thereby resulting in increased sorption of lead ions. The preferred sorption of lead to copper due to smaller effective hydrated ionic radius has been reported by other researchers [39,40].…”

Section: Competitive Lead and Copper Sorption Equilibriamentioning

confidence: 83%

Effect of electrochemical oxidation of activated carbon fiber on competitive and noncompetitive sorption of trace toxic metal ions from aqueous solution

Harry

Saha

Cumming

2006

Journal of Colloid and Interface Science

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“…Activated carbons are also widely used to treat water contaminated with heavy metals (Radovic et al 2001;Budinova et al 1994) because of their great capacity to adsorb these species. The surface chemistry of activated carbons has a major influence on their capacity to adsorb inorganic compounds, especially metallic cations; moreover, it can be appropriately modified by physical or chemical treatments to increase their adsorption capacity.…”

Section: Introductionmentioning

confidence: 99%

Adsorbent-adsorbate interactions in the adsorption of organic and inorganic species on ozonized activated carbons: a short review

Rivera‐Utrilla

Sánchez‐Polo

2011

Adsorption

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This objective of this work was to summarize the main results obtained in previous papers related to the adsorbent-adsorbate interactions involved in the adsorption of naphthalenesulphonic acids and heavy metals (Cd(II) or Hg(II)) by modified activated carbons. The adsorption of organic compounds (1-naphthalenesulphonic acid, 1,5-naphthalenedisulphonic acid and 1,3,6-naphthalenetrisulphonic acid) and inorganic species (Cd(II) and Hg(II)) was studied on a series of ozonized activated carbon in aqueous phase. Commercial activated carbon (Filtrasorb 400) was treated with different ozone doses to study the effect of ozone treatment on its surface properties and investigate the behavior of the treated carbon samples in the above adsorption processes. After ozonation, carbonyl-and carboxyltype groups were generated on the carbon surface. The action of ozone also affected the textural characteristics of the carbon; thus, the surface area diminished due both to the ozone attack and to the increase in oxygenated groups, which prevented the diffusion of nitrogen by obstructing micropore entrances. The capacity of activated carbon to adsorb naphthalenesulphonic acids sharply decreased with a greater number of sulphonic groups in the aromatic rings of these acids. As the concentration of oxygenated electronwithdrawing groups on the carbon surface increased, a significant reduction in adsorption capacity was observed. In all cases, the adsorption uptake decreased with higher solution pH. The adsorption of metallic ions, Cd(II) and Hg(II), by this series of ozonized activated carbons was also studied. In the case of Cd(II), the adsorption capacity and affinity of the adsorbents increased with a higher concentration of J. Rivera-Utrilla ( ) · M. Sánchez-Polo acid oxygenated groups on the activated carbon surface. In the case of Hg(II), the adsorption diminished with an increase in the degree of oxidation of the activated carbon. The adsorption of 1,3,6-naphthalenetrisulphonic acid on the ozonized carbons was also studied in the presence of Cd(II) and Hg(II). The presence of Cd(II)) in the medium enhanced the sulphonic acid uptake, mainly for the most ozonized activated carbon sample, whereas the presence of Hg(II) had no significant effect on the adsorption.

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Removal of metal ions from aqueous solution by activated carbons obtained from different raw materials

Cited by 104 publications

References 6 publications

Chemically activated Ipomoea carnea as an adsorbent for the copper sorption from synthetic solutions

Chemically activated Ipomoea carnea as an adsorbent for the copper sorption from synthetic solutions

Effect of electrochemical oxidation of activated carbon fiber on competitive and noncompetitive sorption of trace toxic metal ions from aqueous solution

Adsorbent-adsorbate interactions in the adsorption of organic and inorganic species on ozonized activated carbons: a short review

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