Evaluación de materiales litológicos oxídicos como adsorbentes para el tratamiento de efluentes y aguas residuales.

Prato, José G.; Millán, Fernando Bonilla; González, L.; Ríos, Iván; Márquez, Andrés; Sánchez-Molina, Jorge; Palomares, Emilio

doi:10.37135/ns.01.08.06

Cited by 3 publications

(5 citation statements)

References 13 publications

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“…On page 6, line 5, k 1 and k 2 appear which are not defined in the text and do not appear in eqs. (3)(4).…”

Section: Are the Conclusion Drawn Adequately Supported By The Results...mentioning

confidence: 99%

“… 2 , 6 Residual water treatment and organic matter removing also have been studied. 3 , 31 This study reports a 60-85% reduction in turbidity units, 95-98% reducing biological oxygen demand as well as 88-94% reducing chemical oxygen demand. After acid treatment, the calcined substrate has also been applied in anionic adsorption studies as sulphate and phosphate adsorption.…”

Section: Introductionmentioning

confidence: 94%

“…Comment 5: On page 6, line 5, k1 and k2 appear which are not defined in the text and do not appear in eqs. (3)(4). K1 (page 6 line 7) is identical to k1 from line 5?.…”

Section: Data Availabilitymentioning

confidence: 99%

“…1 , 2 The two most important properties of these kinds of materials are the thermal resistance and their amphoteric behavior. 2 , 3 In alkaline medium the oxides deprotonate, to create surface negative charges while in acidic medium the oxides protonate, to create surface positive charges. In the first case it favors the cationic adsorption while the second one it favors the anionic adsorption.…”

Section: Introductionmentioning

confidence: 99%

“…I recommend the following references must be added to enrich the manuscript [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] . 20.…”

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confidence: 99%

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Adsorption of Pb (II) ions on variable charge oxidic calcined substrates with chemically modified surface

Prato,

Millán,

Rangel

et al. 2024

F1000Res

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Background The paper describes lead ion adsorption on variable charge oxidic calcined substrates with chemically modified surfaces. Amphoteric oxides of iron, aluminum, titanium, and manganese, change their surface electric charge after acid or alkaline treatment, letting cationic or anionic adsorption reactions from aqueous solutions. This property allows using them as adsorbing substrate for heavy metals retention in water treatment systems. Methods Substrate was prepared by extruding cylindrical strips from a saturate paste of the oxidic lithological material-OLM; dries it up and thermally treated by calcination. The study was performed by triplicated trial, on batch mode, using 2 grams samples of treated with NaOH 0.1N and non-treated substrate. Lead analysis was performed by AAS-GF. Freundlich and Langmuir models were used to fit results. Comparing differential behavior between treated and non-treated substrates showed the variable charge nature of the OLM. Results Results show L-type isotherms for the adsorption of Pb(II) ions on the activated substrate, suggesting good affinity between Pb(II) ions and OLM’s surface. Average value of adsorption capacity (K) for activated substrate (1791.73±13.06), is around four times greater than the non-activated substrate (491.54±31.97), during the adsorption reaction, 0.35 and 0.26 mmolH+ of proton are produced on the activated and non-activated substrate respectively using a 1 mM Pb(II) solution and 72.2 and 15.6 mmolH+ using a 10 mM Pb(II) solution. This acidification agrees with the theoretic model of transitional metals chemisorption on amphoteric oxides, present in lithological material used for the preparation of adsorbent substrates, confirming the information given by the L-type isotherms. Conclusions Results suggest that these variable charge oxidic adsorbent substrate show great potential as an alternative technique for water treatment at small and medium scale using granular filtration system. The easiness and low price make them suitable to apply in rural media where no treating water systems is available.

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“…On page 6, line 5, k 1 and k 2 appear which are not defined in the text and do not appear in eqs. (3)(4).…”

Section: Are the Conclusion Drawn Adequately Supported By The Results...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

“…Comment 5: On page 6, line 5, k1 and k2 appear which are not defined in the text and do not appear in eqs. (3)(4). K1 (page 6 line 7) is identical to k1 from line 5?.…”

Section: Data Availabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…I recommend the following references must be added to enrich the manuscript [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] . 20.…”

mentioning

confidence: 99%

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Adsorption of Pb (II) ions on variable charge oxidic calcined substrates with chemically modified surface

Prato,

Millán,

Rangel

et al. 2024

F1000Res

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Adsorption of Pb (II) ions on variable charge oxidic calcined substrates with chemically modified surface

Prato

Millán²,

Rangel³

et al. 2023

F1000Res

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Background: The adsorption process is an alternative method for treating natural and waste waters, with heavy metals. Oxidic lithological materials, rich in iron and aluminum amphoteric oxides, with pH-dependent surface charges, are a reliable medium for ionic adsorption. Being thermally resistant, these materials can be used to prepare a calcined substrate which is chemically treated in an acid or alkaline solution to enlarge surface positive or negative charge density, making it possible anion as well as cation adsorption reactions from aqueous solutions. Oxidic lithological materials use is a low-cost alternative for filtering system because of its availability and ease of preparation and application. Methods: Present paper shows results of the adsorption reaction of Pb+2 ions on calcined substrates prepared with oxidic lithologic material. The study was performed on the substrate with chemically modified surface in alkaline medium as well as on non-treated surface. Results: Results show L-type isotherms for the adsorption on the activated substrate, indicative affinity between adsorbate and adsorbent. Average value of adsorption capacity (k) for activated substrate is around 3.7 times greater (1791.73±13.06) compared to the respective average k value for the non-activated substrate (491.54±31.97), during the adsorption reaction, 0.35 and 0.26 mmolH+ of proton are produced on the activated and non-activated substrate respectively using a 1 mM Pb+2 solution and 72.2 and 15.6 mmolH+ using a 10 mM Pb+2 solution. This acidification agrees with the theoretic model of transitional metals chemisorption on amphoteric oxides of Fe, Al, Ti and Mn present in lithological material used for the preparation of adsorbent substrates confirming the information given by the L-type isotherms. Conclusions: Results suggest that these oxidic lithologic materials show great potential as an alternative technique for water treatment and heavy metal retention from contaminated waters using a low-cost and reliable adsorption system.

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Adsorption of Phosphate and Nitrate Ions on Oxidic Substrates Prepared with a Variable-Charge Lithological Material

Prato

Millán²,

González

et al. 2022

Water

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This work evaluates phosphate and nitrate ion adsorption from aqueous solutions on calcined adsorbent substrates of variable charge, prepared from three granulometric fractions of an oxidic lithological material. The adsorbent material was chemically characterized, and N2 gas adsorption (BET), X-ray diffraction, and DTA techniques were applied. The experimental conditions included the protonation of the beds with HCl and H2SO4 and the study of adsorption isotherms and kinetics. The lithological material was moderately acidic (pH 5) with very little solubility (electrical conductivity 0.013 dS m−1) and a low cation exchange capacity (53.67 cmol (+) kg−1). The protonation reaction was more efficient with HCl averaging 0.745 mmol versus 0.306 mmol with H2SO4. Likewise, the HCl-treated bed showed a better adsorption of PO4−3 ions (3.296 mg/100 g bed) compared to the H2SO4-treated bed (2.579 mg/100 g bed). The isotherms showed great affinity of the PO4−3 ions with the oxide surface, and the data fit satisfactorily to the Freundlich model, suggesting a specific type of adsorption, confirmed by the pseudo-second-order kinetic model. In contrast, the nitrate ions showed no affinity for the substrate (89.7 µg/100 g for the HCl-treated bed and 29.3 µg/100 g bed for the H2SO4-treated bed). Amphoteric iron and aluminum oxides of variable charges present in the lithological material studied allow for their use as adsorbent beds as an alternative technique to eliminate phosphates and other ions dissolved in natural water.

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Evaluación de materiales litológicos oxídicos como adsorbentes para el tratamiento de efluentes y aguas residuales.

Cited by 3 publications

References 13 publications

Adsorption of Pb (II) ions on variable charge oxidic calcined substrates with chemically modified surface

Adsorption of Pb (II) ions on variable charge oxidic calcined substrates with chemically modified surface

Adsorption of Pb (II) ions on variable charge oxidic calcined substrates with chemically modified surface

Adsorption of Phosphate and Nitrate Ions on Oxidic Substrates Prepared with a Variable-Charge Lithological Material

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