Cu(II), Pb(II) and Cd(II) sorption on different layered double hydroxides. A kinetic and thermodynamic study and competing factors

González, M.A.; Pavlović, I.; Barriga, C.

doi:10.1016/j.cej.2015.01.094

Cited by 135 publications

(42 citation statements)

References 31 publications

(43 reference statements)

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“…The values of enthalpy change (DH°) were 21.68 kJ mol À1 for PAL and 9.27 kJ mol À1 for HPAL, respectively. The positive values of DH°indicate that the adsorption process was endothermic nature (Bazargan-Lari et al, 2014;Gonza´lez et al, 2015). Additionally, the positive values of entropy change suggest the process is entropy driven and the increased randomness at the solid-solute interface (Chen et al, 2010;Hamza et al, 2013) during the adsorption of Pb(II) onto P. americana.…”

Section: Thermodynamic Parametersmentioning

confidence: 93%

Removal of Pb(II) from aqueous solutions by Phytolacca americana L. biomass as a low cost biosorbent

Wang

Zhang

Yao

et al. 2018

Arabian Journal of Chemistry

123

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Screening a new biosorbent with low cost and high efficiency from a native plant material is a key to the adsorption of heavy metal ions from wastewater. In this study, the potential of Phytolacca americana L. as a biosorbent for Pb(II) removal from aqueous solutions was investigated. Experiments were performed to evaluate the effect of biosorbent dosage, pH, initial Pb(II) concentration and contact time on the Pb(II) removal. The results indicated that the hydroxyl, carboxyl and amine groups may take part in Pb(II) binding. HNO 3 -modified P. americana (HPAL) showed a significant higher uptake capacity compared to original P. americana (PAL) (p < 0.05). A dose of 20 g L À1 of biosorbents in solutions with an initial pH of 6.0, an initial Pb(II) concentration of 30 mg L À1 and a contact time of 120 min resulted in the maximum Pb(II) removal efficiency. The Freundlich isotherm gave a better fit than the Langmuir isotherm revealed that the biosorption was potentially multilayer. Further, the adsorption kinetics followed a pseudo second-order model, which implied that the biosorption was mainly a chemisorption process. The thermodynamic properties showed that the Pb(II) adsorption onto the P. americana biomass was feasible, spontaneous and exothermic in nature. Both physisorption and chemisorption were involved in the biosorption of Pb(II) onto the surface of P. americana biomass through electrostatic interaction and ion exchange. Additionally, desorption studies revealed promising regeneration potential of these biosorbents. The present study showed that P. americana biomass could be used

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Section: Thermodynamic Parametersmentioning

confidence: 93%

Removal of Pb(II) from aqueous solutions by Phytolacca americana L. biomass as a low cost biosorbent

Wang

Zhang

Yao

et al. 2018

Arabian Journal of Chemistry

123

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“…However, the presence of chelated zinc does not affect the adsorption process in this case, because the stability constants of Zn-EDTA complexes and Cd-EDTA complexes are both about 16.5. The fast removal rate in the beginning may be attributable to more available sites at the initial stage [21,26].…”

Section: Adsorption Experimentsmentioning

confidence: 99%

“…Both the initial pH and the final pH were observed around 5-6 during the reaction in this work. It is indicated that the pH may not vary so much when the concentration of metal ion is low (100 ppb in this case) [4,21,26,27], then the adsorption experiment was conducted without adjusting pH in this study.…”

Section: Adsorption Experimentsmentioning

confidence: 99%

“…K F is a measure of adsorption capacity, and 1/n refers to the adsorption intensity of the system. It is shown that 1/n values between 0.1 and 1.0 refers to an interaction between exchange sites in the adsorbent and Cd(II) cations [20,26,28,29]. The K F and 1/n in Table 2 indicates the adsorption process is favorable.…”

Section: Adsorption Isotherms and Kinetic Modelsmentioning

confidence: 99%

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Adsorption of Cd(II) on Zn-Al LDHs (Layered Double Hydroxides) Intercalated with Chelating Agents EDTA

Zhang¹,

Kano²,

Inoue³

2016

JCCE

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Abstract:The hydrotalcite-like compound [Zn 2 Al(OH) 6 ]NO 3 ·mH 2 O (shorted as ZnAl-NO 3 ) was intercalated with the chelating agent EDTA (ethylene diamine tetraacetic acid) by anion exchange to uptake cadmium ion from aqueous solutions. The materials synthesized in this work were characterized by chemical analysis, FT-IR (fourier transform infrared spectroscopy), XRD (X-ray powder diffraction) to confirm their properties. In order to investigate the optimum conditions for Cd(II) adsorption, the amount of Cd(II) adsorbed by Zn-Al LDHs intercalated with EDTA (ZnAl-EDTA) under different conditions (i.e., adsorbent dosage, temperature and contact time) were determined by ICP-AES (inductively coupled plasma-atomic emission spectrometry). Adsorption isotherms of Cd(II) onto ZnAl-EDTA were measured at varying initial Cd concentrations (0.05 mg/L to 1 mg/L) under optimized conditions. The data were applied to Langmuir and Freundlich isotherms model, and well fitted by the Freundlich isotherms model. The pseudo-second-order kinetic model was more adequate to describe the kinetic in this case.

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“…Such types of nanomaterials include carbon nano tubes, zeolites, ceramic membranes, graphene sheets and LDHs. The inorganic pollutants include chloride ions, arsenate, chromium, iron, lead and others [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Water decontamination via the removal of Pb (II) using a new generation of highly energetic surface nano-material: Co +2 Mo +6 LDH

Mostafa

Bakr

Naggar

et al. 2016

Journal of Colloid and Interface Science

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Cu(II), Pb(II) and Cd(II) sorption on different layered double hydroxides. A kinetic and thermodynamic study and competing factors

Cited by 135 publications

References 31 publications

Removal of Pb(II) from aqueous solutions by Phytolacca americana L. biomass as a low cost biosorbent

Removal of Pb(II) from aqueous solutions by Phytolacca americana L. biomass as a low cost biosorbent

Adsorption of Cd(II) on Zn-Al LDHs (Layered Double Hydroxides) Intercalated with Chelating Agents EDTA

Water decontamination via the removal of Pb (II) using a new generation of highly energetic surface nano-material: Co +2 Mo +6 LDH

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