Comparison of isotherms for the ion exchange of Pb(II) from aqueous solution onto homoionic clinoptilolite

Berber-Mendoza, M.S.; Leyva‐Ramos, Roberto; Alonso-Dávila, Pedro A.; Fuentes-Rubio, L.; Guerrero-Coronado, Rosa M.

doi:10.1016/j.jcis.2006.04.037

Cited by 65 publications

(24 citation statements)

References 12 publications

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“…Besides that, lead was selected in this work, because of its large ionic radius, because it forms a monovalent ion (Pb 2+ + H 2 O → Pb(OH) + ) and because it acts as a borderline acid in comparison with the hard acids Fe 3+ and Na + . In lead exchange experiments both on not-pretreated and homoionic sodic clinoptilolites, selectivity varied [14,21,22,24,25] even for similar Si/Al ratios and comparable conditions. Exchange isotherms of lead presented concave types "a" and "d" according to Breck [36], whereas iron exchange isotherms have been reported with sigmoid type "b" [23].…”

Section: Parent and Exchanged Tuffsmentioning

confidence: 95%

“…On the same subject, lead, various research groups have studied cation exchange equilibria in lead-clinoptilolite batch systems [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] and for heulandite, the isostructural aluminosilicate of clinoptilolite, modification by lead has been reviewed by Inglezakis [26]. However, the adsorption properties of lead-modified clinoptilolites have not been studied extensively.…”

Section: Introductionmentioning

confidence: 99%

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Interaction between organic vapors and clinoptilolite–mordenite rich tuffs in parent, decationized, and lead exchanged forms

Elizalde-González

Pérez-Cruz

2007

Journal of Colloid and Interface Science

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Section: Parent and Exchanged Tuffsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Interaction between organic vapors and clinoptilolite–mordenite rich tuffs in parent, decationized, and lead exchanged forms

Elizalde-González

Pérez-Cruz

2007

Journal of Colloid and Interface Science

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“…The natural zeolite was characterized in previous works(Berber-Mendoza et al 2006;Leyva-Ramos et al 2008). The XRD pattern of the natural zeolite revealed that the zeolite was chiefly composed of clinoptilolite, and it contained impurities such as quartz, calcite and feldspar(Leyva- Ramos et al 2008).…”

mentioning

confidence: 99%

“…The XRD pattern of the natural zeolite revealed that the zeolite was chiefly composed of clinoptilolite, and it contained impurities such as quartz, calcite and feldspar(Leyva- Ramos et al 2008). The chemical composition of the natural zeolite is given inTable 1(Berber-Mendoza et al 2006). The natural zeolite had a Si/Al molar ratio of 6.89.…”

mentioning

confidence: 99%

Adsorption of arsenic (V) from a water solution onto a surfactant-modified zeolite

et al. 2010

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In this study a surfactant-modified zeolite (SMZ) was prepared by adsorbing the cationic surfactant hexadecyltrimethylammonium (HDTMA) bromide on a clinoptilolite. The adsorption of the surfactant modified the surface properties of the clinoptilolite and enhanced the anionic capacity of the SMZ. The adsorption equilibrium data of As(V) from the water solution on the SMZ were obtained in a batch adsorber, and the Langmuir isotherm matched the data reasonably well. The As(V) adsorption capacity of the SMZ was 12.5 times greater than that of the clinoptilolite. The adsorption of As(V) on SMZ was mainly due to the interactions between the anionic sites of the SMZ and the As(V) anions in water solution. The adsorption capacity of the SMZ was dependent on the solution pH. The adsorption capacity was increased and decreased by augmenting the pH from 5 to 7 and from 7 to 12, respectively. This unusual behavior was due to the fact that the affinity of the As(V) for the SMZ was dependent on the As(V) species that were present in solution. The adsorption capacity of the SMZ was slightly favored by decreasing the temperature from 25 to 15°C. The heat of adsorption was estimated to be H ads = −46.82 KJ/mol, indicating that the adsorption was exothermic and the As(V) was chemisorbed on the SMZ.Initial concentration of As(V) in solution, μg/L C Concentration of As(V) at equilibrium in solution, μg/L k Constant of the Freundlich isotherm, μg 1−1/n L 1/n /g K Constant of the Langmuir isotherm, L/μg K 0 Frequency factor, L/μg H ads Heat of adsorption, KJ/mol m Mass of SMZ, g n Constant of the Freundlich isotherm N Number of experimental data points q Uptake of As(V) adsorbed on SMZ, μg/g q exp Experimental uptake of As(V) adsorbed on the SMZ, μg/g q m Maximum uptake of As(V) adsorbed on SMZ, μg/g q pred Uptake of As(V) predicted with the adsorption isotherm, μg/g q 0 Initial uptake of As(V) adsorbed on the ZMS at the beginning of a desorption step, μg/g R Ideal gas constant, J/mol K T Temperature, K V Volume of As(V) solution, L

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“…The maximum biosorption capacities of Cu(II) and Pb(II) onto P. pseudoalcaligenes cell reach 0.443 and 1.12 mmol/g dry cells, respectively, at pH 5. The most common adsorbents for heavy metals are ionexchange resins, either synthetic or natural solid resin that are effective to remove metals, such as cation-exchange resin Purolite C100 and clinoptilolite ion-exchange resin with adsorption capacities between 0.04 and 1.4 mmol/g for Cu(II) and Pb(II) ions at pH 4-5 (Berber- Mendoza et al 2006;Abo-Farha et al 2009;Fu and Wang 2011). Compared with these conventional ion-exchange resins, the binding capacities of P. pseudoalcaligenes cells for the studied metals are high enough for use in the removal of heavy metals from solution.…”

Section: Metal Biosorptionmentioning

confidence: 99%

Application of the Surface Complexation Model to the Biosorption of Cu(II) and Pb(II) Ions onto Pseudomonas Pseudoalcaligenes Biomass

Liu

Song

Tang

2013

Adsorption Science & Technology

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ABSTRACT:In this study, a potentiometric titration was performed to investigate the surface acid-base properties of Pseudomonas pseudoalcaligenes isolated from activated sludge. Batch sorption as a function of pH was performed to explain the sorption behaviour of Cu(II) and Pb(II) ions onto the bacterial surface. The surface complexation approach in the frame of constant capacitance model was applied to determine the deprotonation constants, site concentrations and metal stability constants for the important surface-functional groups on the biomass. The optimized results showed that the three discrete sites-three pK a s model, involving three distinct types of functional groups, namely, carboxyl, phosphate and hydroxyl, could actually fit the protonation of the bacterial functional groups, with average pK a values of 4.18, 6.31 and 9.18, and site concentrations of 0.526, 0.525 and 0.478 mmol/g, respectively. The two sites model provided the best fit for the biosorption of Cu(II) and Pb(II) ions onto the biomass by forming complexes with carboxyl and phosphate surface sites, with average log stability constants of 5.95 and 6.94 for Cu(II), and 6.64 and 8.08 for Pb(II), respectively. These results suggested that the surface complexation model yielded the accurate prediction for the biosorption behaviour of Cu(II) and Pb(II) ions on the bacterial biomass and the affinity of P. pseudoalcaligenes biomass for the adsorption of Cu(II) and Pb(II) ions was high enough to remove the metal ions from water.

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Comparison of isotherms for the ion exchange of Pb(II) from aqueous solution onto homoionic clinoptilolite

Cited by 65 publications

References 12 publications

Interaction between organic vapors and clinoptilolite–mordenite rich tuffs in parent, decationized, and lead exchanged forms

Interaction between organic vapors and clinoptilolite–mordenite rich tuffs in parent, decationized, and lead exchanged forms

Adsorption of arsenic (V) from a water solution onto a surfactant-modified zeolite

Application of the Surface Complexation Model to the Biosorption of Cu(II) and Pb(II) Ions onto Pseudomonas Pseudoalcaligenes Biomass

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