Formation of cerussite and hydrocerussite during adsorption of lead from aqueous solution on oxidized carbons by cold oxygen plasma

Maldonado, Paola S. De Velasco; Hernández‐Montoya, Virginia; Concheso, A.; Montes-Morán, Miguel A.

doi:10.1016/j.apsusc.2016.06.025

Cited by 26 publications

(21 citation statements)

References 36 publications

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“…As demonstrated by many studies, the activation of these components was dependent on the solution pH. For example, carboxyl groups become deprotonated when the solution pH was above 3.7, these groups would be dissociated to provide more active sites for heavy metal adsorption 4, 5, 44 . In addition, SiO 2 component is negatively charged until the pH is increased to 4.5 13, 45 , but it can also contribute to the adsorption of heavy metals when the pH is above 4.5.…”

Section: Resultsmentioning

confidence: 99%

Lead adsorption by biochar under the elevated competition of cadmium and aluminum

Han

Qian

Rong-qin

et al. 2017

Sci Rep

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Competitive adsorption studies are important to accurately estimate the lead adsorption capacity on biochar in soil. The structure of biochars was evaluated by Fourier-Transform Infrared Spectroscopy and X-ray Diffraction, and the competitive of Cadmium (Cd) and Aluminum (Al) with Lead (Pb) adsorption were determined by kinetic experiments and pH effects. Adsorption kinetics indicated that the adsorption amount (mg g−1) of Pb by biochar was in the decreasing order of CM400 (90.9) > BB600 (56.5) > CM100 (29.2), the presence of the oxygen-containing functional groups, Si-containing mineral, PO4 3− and CO3 2− significantly contributed to Pb adsorption by biochars. With the presence of Cd, Pb adsorption amount was reduced by 42.6%, 23.7% and 19.3% for CM100, CM400 and BB600, respectively. The Si-containing mineral, PO4 3− and CO3 2− that were rich in CM400 and BB600 has led to less competition by Cd. In addition, Al showed a strong competition with Pb leading to the adsorption being reduced by 95.8%, 82.3% and 80.6%, respectively for CM100, CM400 and BB600. This was mainly attributed to the additional acidification effect by Al resulting in a counteractive of biochar’s liming effect. Results from this study are important for accurately estimating the heavy metal adsorption by biochar in soil.

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Section: Resultsmentioning

confidence: 99%

Lead adsorption by biochar under the elevated competition of cadmium and aluminum

Han

Qian

Rong-qin

et al. 2017

Sci Rep

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“…Thermodynamic data as provided in Bissengaliyeva et al [ 2 , 3 ] are required to describe the formation of lead and zinc carbonates occurring in the oxidation zones of sulfide ore deposits. In addition, theoretical investigations may be assisted by these data when Pb 2+ ions have to be removed from aqueous solution [ 10 , 11 ]. Phase stability of molybdates is a key issue when molybdenum containing nuclear waste is immobilized in borosilicate glasses [ 4 – 8 ].…”

Section: Introductionmentioning

confidence: 99%

Low temperature heat capacities and thermodynamic functions described by Debye–Einstein integrals

Gamsjäger

Wießner

2018

Monatsh Chem

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Thermodynamic data of various crystalline solids are assessed from low temperature heat capacity measurements, i.e., from almost absolute zero to 300 K by means of semi-empirical models. Previous studies frequently present fit functions with a large amount of coefficients resulting in almost perfect agreement with experimental data. It is, however, pointed out in this work that special care is required to avoid overfitting. Apart from anomalies like phase transformations, it is likely that data from calorimetric measurements can be fitted by a relatively simple Debye–Einstein integral with sufficient precision. Thereby, reliable values for the heat capacities, standard enthalpies, and standard entropies at T = 298.15 K are obtained. Standard thermodynamic functions of various compounds strongly differing in the number of atoms in the formula unit can be derived from this fitting procedure and are compared to the results of previous fitting procedures. The residuals are of course larger when the Debye–Einstein integral is applied instead of using a high number of fit coefficients or connected splines, but the semi-empiric fit coefficients keep their meaning with respect to physics. It is suggested to use the Debye–Einstein integral fit as a standard method to describe heat capacities in the range between 0 and 300 K so that the derived thermodynamic functions are obtained on the same theory-related semi-empiric basis. Additional fitting is recommended when a precise description for data at ultra-low temperatures (0–20 K) is requested.Graphical abstract

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“…2,3 In this light, lead (Pb(II)) is an extremely toxic heavy metal, which causes encephalopathy, anaemia and liver damage, and affects the central nervous system. [4][5][6] On the other hand, malachite green (MG) is a synthetic dye of basic nature, which is extensively used in the textile industry and in curing bacterial or fungal infections and parasites in sh. Malachite green has the potential to cause cancer, respiratory diseases and teratogenicity.…”

Section: Introductionmentioning

confidence: 99%

Insights into the competitive adsorption of pollutants on a mesoporous alumina–silica nano-sorbent synthesized from coal fly ash and a waste aluminium foil

et al. 2020

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Formation of cerussite and hydrocerussite during adsorption of lead from aqueous solution on oxidized carbons by cold oxygen plasma

Cited by 26 publications

References 36 publications

Lead adsorption by biochar under the elevated competition of cadmium and aluminum

Lead adsorption by biochar under the elevated competition of cadmium and aluminum

Low temperature heat capacities and thermodynamic functions described by Debye–Einstein integrals

Insights into the competitive adsorption of pollutants on a mesoporous alumina–silica nano-sorbent synthesized from coal fly ash and a waste aluminium foil

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