Elucidation of mechanism involved in adsorption of Pb(II) onto lobeira fruit (Solanum lycocarpum) using Langmuir, Freundlich and Temkin isotherms

Araújo, Cleide Sandra Tavares; Almeida, Ione Lucenir Silva; Rezende, Hélen C.; Marcionilio, Suzana M.L.O.; Linares, J.; Matos, Túlio N.

doi:10.1016/j.microc.2017.11.009

Cited by 421 publications

(126 citation statements)

References 33 publications

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“…The adsorption energy value calculated from the D-R isotherm informs which of the physical adsorption or chemical adsorption is more dominant at the adsorption mechanism [20]. According to the assumption of Temkin isotherm, the adsorption heat of all molecules in the adsorbent layers decreases linearly due to the adsorbent/adsorbate interactions [21].…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Cr(VI) removal using Fe2O3-chitosan-cherry kernel shell pyrolytic charcoal composite beads

Altun

Ecevit

2019

Environmental Engineering Research

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In this study, cherry kernel shell pyrolytic charcoal was synthesized (CKSC) and composite beads were obtained by blending this pyrolytic charcoal with chitosan and Fe2O3 nanoparticles (Fe-C-CKSC). Cr(VI) adsorption from aqueous solutions by Fe-C-CKSC composite beads and CKSC adsorbents was studied comparatively. The effects of Cr(VI) initial concentration, adsorbent dosage, contact time, pH and temperature parameters on Cr(VI) adsorption were investigated. Adsorption reached an equilibrium point within 120 min for CKSC and Fe-C-CKSC adsorbents. The maximum Cr(VI) removal was obtained at the initial pH value of 1.56 for CKSC and 2.00 for Fe-C-CKSC. The optimum adsorbent dosage was found to be 5 g/L for CKSC and 3 g/L for Fe-C-CKSC. Based on the Langmuir model, the maximum adsorption capacities were calculated as 14.455 mg/g and 47.576 mg/g for CKSC and Fe-C-CKSC, respectively. Thermodynamic and kinetic studies were performed. As a result of adsorption kinetics calculations, adsorption was found to be consistent with the pseudo second order kinetic model. Characterization of the synthesized adsorbents was performed by SEM, BET, FTIR and elemental analysis. This study has shown that low cost adsorbents CKSC and Fe-C-CKSC can be used in Cr(VI) removal from aqueous solutions.

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Section: Adsorption Isothermsmentioning

confidence: 99%

Cr(VI) removal using Fe2O3-chitosan-cherry kernel shell pyrolytic charcoal composite beads

Altun

Ecevit

2019

Environmental Engineering Research

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“…For the 1/n of Freundlich, values less than 0.5 demonstrated that the adsorbent could easily adsorb Cr(VI). As the temperature increased, the smaller and smaller 1/n values showed that the high temperature was more favorable for adsorption [35][36][37]. The maximum adsorption capacity (Q m ) was 322 mg/g at 25 • C in the Langmuir model, which was larger than that of most adsorbents (Table S4).…”

Section: Resultsmentioning

confidence: 98%

Removal of Cr(VI) from Aqueous Solution by Polypyrrole/Hollow Mesoporous Silica Particles

Gao

Liu

et al. 2020

Nanomaterials

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The removal of Cr(VI) in wastewater plays an important role in human health and environment. In this work, polypyrrole/hollow mesoporous silica particle (PPy/HMSNs) adsorbents have been newly synthesized by in-situ polymerization, which prevent the aggregation of pyrrole in the process of polymerization and exhibit highly selective and powerful adsorption ability for Cr(VI). The adsorption process was in good agreement with the quasi-second-order kinetic model and the Langmuir isotherm model. And the maximum adsorption capacity of Cr(VI) was 322 mg/g at 25 °C. Moreover, the removal rate of Cr(VI) by PPy/HMSNs was ~100% in a number of binary systems, such as Cl−/Cr(VI), NO3−/Cr(VI), SO42−/Cr(VI), Zn2+/Cr(VI), Fe3+/Cr(VI), Sn4+/Cr(VI), and Cu2+/Cr(VI). Thus, the PPy/HMSNs adsorbents have great potential for the removal of Cr(VI) in wastewater.

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“…To explain adsorbate/adsorbent interaction, three Langmuir, Freundlich, and Temkin isotherms are evaluated for which linear equations are provided in Equations , respectively, where q e is the Cd(II) amount adsorbed at equilibrium (mg/g), C e reveals the equilibrium concentration (g/L), q max is the highest adsorption capacity for a monolayer (mg/g), and K L is the Langmuir isotherm constant (L/mg); K f and n indicate Freundlich constants (Alijani et al, , ; Alijani & Shariatinia, , ). In the Temkin isotherm, K T is the equilibrium binding constant and B reveals a constant related to heat of sorption (J/mol) (Araújo et al, ).

\frac{C_{e}}{q_{e}} = \frac{1}{K_{L} q_{truemax}} + \frac{C_{e}}{q_{max}}

log q_{e} = log K_{f} + \frac{1}{n} log C_{e}

q_{e} = B log C_{e} + B log K_{T}

…”

Section: Resultsmentioning

confidence: 99%

“…isotherm, K T is the equilibrium binding constant and B reveals a constant related to heat of sorption (J/mol) (Araújo et al, 2018). The isotherm curves are illustrated in Figure 7a-c, and cadmium(II) adsorption constants for the Langmuir, Freundlich, and Temkin models are listed in Table 2.…”

Section: Research Articlementioning

confidence: 99%

Hybrid silica aerogel nanocomposite adsorbents designed for Cd(II) removal from aqueous solution

Shariatinia‬

Esmaeilzadeh

2019

Water Environment Research

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Hybrid silica aerogel (HSA) nanoparticles were synthesized by sol–gel method and drying at ambient pressure. Also, two magnetic nanocomposites of HSA with Fe3O4 nanoparticles and chitosan (CS) were prepared including HSA‐Fe3O4 and HSA‐Fe3O4‐CS. The morphology, structure, and magnetic properties of the HSA as well as its nanocomposites were analyzed by SEM, XRD, TGA, VSM, and ATR‐FTIR techniques. The saturation magnetization (Ms) values for the Fe3O4 NPs, HSA‐Fe3O4, and HSA‐Fe3O4‐CS nanocomposite film were 69.93, 19.04, and 5.77 emu/g, respectively. Furthermore, the abilities of the HSA, HSA‐Fe3O4, CS, and HSA‐Fe3O4‐CS adsorbents were assessed for removal of cadmium(II) heavy metal ions (100 ppm) from aqueous solution. All adsorbents removed/adsorbed the maximum Cd(II) ions in 120 min when adsorbent dosage = 20 mg and pH = 8. Moreover, the highest adsorption capacities were 58.5, 69.4, 65.8, and 71.9 mg/g for the HSA, CS, HSA‐Fe3O4, and HSA‐Fe3O4‐CS, respectively. Kinetic studies using all adsorbents verified that Cd(II) adsorption obeyed the second‐order model illustrating the analyte chemisorption was happened on the adsorbent surfaces. All adsorption data were well consistent with the Langmuir isotherms. The reusability experiment confirmed that all of adsorbents could preserve >95% of their initial adsorption capacities even after five series of adsorption/desorption tests. Practitioner points Hybrid silica aerogel (HSA), HSA‐Fe3O4, and HSA‐Fe3O4‐CS adsorbents were produced. Nanocomposites were characterized by XRD, TGA, SEM, VSM, and ATR‐FTIR analysis. Adsorption of cadmium(II) ions by adsorbents was examined in aqueous solution. The highest adsorption capacity was obtained for the HSA‐Fe3O4‐CS (71.9 mg/g). Cd(II) adsorption followed second‐order kinetics and Langmuir isotherm model.

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Elucidation of mechanism involved in adsorption of Pb(II) onto lobeira fruit (Solanum lycocarpum) using Langmuir, Freundlich and Temkin isotherms

Cited by 421 publications

References 33 publications

Cr(VI) removal using Fe<sub>2</sub>O<sub>3</sub>-chitosan-cherry kernel shell pyrolytic charcoal composite beads

Cr(VI) removal using Fe<sub>2</sub>O<sub>3</sub>-chitosan-cherry kernel shell pyrolytic charcoal composite beads

Removal of Cr(VI) from Aqueous Solution by Polypyrrole/Hollow Mesoporous Silica Particles

Hybrid silica aerogel nanocomposite adsorbents designed for Cd(II) removal from aqueous solution

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