Remoción de plomo en soluciones acuosas empleando nanoaluminofosfatos amorfos

Rondón, Wendy; Sifontes, Ángela B.; Freire-Lista, David Martín; Quintal, Manuelita; Cañizales, Edgar; Méndez, Franklin J.; Llovera, Ligia; Díaz, Yraida; Brito, Joaquı́n L.

doi:10.4136/ambi-agua.1437

Cited by 4 publications

(2 citation statements)

References 15 publications

(8 reference statements)

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“…Only Pb(II), Cu(II), Cr 2 O 2− and to a lesser degree, Zn(II) present a significant deviation. The first is consistent with a phenomenon existing in aqueous systems related to the greater polarisability and lower enthalpy of this species concerning the others 36 , which allows them to diffuse more easily (Fig. 4) and get closer to the surface of the solid and interact better with it.…”

Section: Porosity (P) (%)supporting

confidence: 86%

“…The infrared spectrum analysis ( Fig. 1) confirms the presence of bands characteristic of metal silicates in the 514-1480 cm −1 zone, referring to the different types of internal oscillations within the network ( O−Si−O y Al−O−Si) 36 Physical characterization of aluminium silicate. The material physical characterization revealed a series of properties inherent to sorbents such as real density, apparent density, apparent density through entrapment, compressibility, porosity, flow rate, and tortuosity, which are shown in Table 1.…”

Section: Chemical Characterization Of Aluminium Silicate the Experimmentioning

confidence: 71%

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Kinetic study of removal heavy metal from aqueous solution using the synthetic aluminum silicate

Treto‐Suárez

Prieto-García

Mollineda-Trujillo

et al. 2020

Sci Rep

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One of the problems that most affect humanity today is the wastewater discharge into different water bodies. It was estimated that more than 7 million tons of wastewater are generated worldwide and are discharged into rivers, lakes, and reservoirs. Among the most dangerous wastewaters are those from inorganic chemistry research laboratories, mainly due to heavy metals. These problems have become a highly relevant topic, and numerous researchers have tried to design wastewater treatment systems that will deal more efficiently with heavy metals elimination. In this work, the synthesis, characterization, and evaluation of hydrated aluminium silicate were performed as alternative wastewater treatment from chemistry research and teaching laboratories. The compound obtained was Al 2 O 3 3SiO 2 H 2 O , which was characterized by the determination of its physicochemical properties. These revealed a low density, very porous material, with low crystallinity, strong chemical resistance, a large surface area, and a high apparent ionic exchange capacity. Absorption kinetics studies of heavy metals in aqueous solutions, through more widespread models, have demonstrated that Al 2 O 3 3SiO 2 H 2 O has excellent properties as absorbents of this material. The amorphous hydrated aluminium silicate achieves a decrease in the concentration of all the metal ions studied, reducing them to discharge levels permissible. The discharge of large wastewater volumes into the environment is currently one of the major environmental pollution concerns 1-4. Among the more common and harmful pollutants are heavy metals, which produce a vast amount of emissions worldwide (just considering the industrial facilities of the European Union member countries, 3,598 tons of heavy metals were discharged into the water in 1 year) 5,6. Discharges of wastewater from various industrial activities such as electroplating, paint production, plastics, metal materials, mining, some energy producers, and welding materials are the main sources of discharges of heavy metals content into the environment 7-10. Thus the great importance of identifying, evaluating and knowing more about the effects of the species present in these residues in order to avoid present and future damage through responsible, safe, efficient, legal and low-cost wastewater management 11-14. The toxicity of metals depends on the chemical species in which it is part, the routes of administration, and the optimal concentration levels above which they are toxic 15,16. Usually, results when an organism is subjected to an excessive concentration of the metal for an extended period, when it appears in a specific biochemical form or when the organism absorbs it by an unusual route 17,18. Since both the deficiency and the elevated levels of many metallic species can lead to adverse effects for health and the environment; Various studies have been documented on the need for them to be discharged at adequate levels. From this problem on the protection of the environment and human health; Considerable attent...

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Section: Porosity (P) (%)supporting

confidence: 86%

Section: Chemical Characterization Of Aluminium Silicate the Experimmentioning

confidence: 71%

Kinetic study of removal heavy metal from aqueous solution using the synthetic aluminum silicate

Treto‐Suárez

Prieto-García

Mollineda-Trujillo

et al. 2020

Sci Rep

View full text Add to dashboard Cite

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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 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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Remoción de plomo en soluciones acuosas empleando nanoaluminofosfatos amorfos

Cited by 4 publications

References 15 publications

Kinetic study of removal heavy metal from aqueous solution using the synthetic aluminum silicate

Kinetic study of removal heavy metal from aqueous solution using the synthetic aluminum silicate

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

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