Sorption of metals on humic acid

Kerndorff, H.; Schnitzer, M.

doi:10.1016/0016-7037(80)90221-5

Cited by 449 publications

(183 citation statements)

References 9 publications

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“…41 Previous studies have demonstrated that NOMs can associate with Ni ions to form organic matter-Ni complexes. 31,42 Hence, the enhancement of the Ni removal in the presence of the NOM can be due to the additional removal mechanism of Ni by surface complexation of LDH-adsorbed organic matter with free Ni ions in solutions. 43 The strong intensity of C 1s peak when NOMs was present in solution conrms the association of the NOMs with the reconstructed LDH (Fig.…”

Section: Possible Ni Removal Mechanismmentioning

confidence: 99%

Synergistic effect of humic and fulvic acids on Ni removal by the calcined Mg/Al layered double hydroxide

Fang

Chen

et al. 2015

RSC Adv.

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Discharge of Ni(II) containing wastewater to terrestrial environment can lead to serious pollution issues. This study presents a facile, cost-effective and highly efficient method to rapidly remove Ni(II) from wastewater using a calcined Mg/Al layered double hydroxide (LDH), which is a pioneering investigation of using the calcined LDH to remove the positively charged Ni(II) ions. The kinetic studies showed that the removal of Ni(II) was very rapid with a pseudo first order k of up to 3.6 AE 0.5 h À1 , and maximum removal of Ni(II) was up to 204.2 AE 10.6 mg g À1 . In addition, our results reveal that both humic (HA) and fulvic acids (FA) can strongly bind to the surface of the LDH, which demonstrates that the calcined LDH can effectively remove both cationic and anionic pollutants in a single process. With the increase of pH up to 7.5, the removal of Ni, HA and FA by the calcined LDH are all drastically enhanced. Our study also demonstrated a strong synergetic effect of FA and HA on the Ni(II) removal by the calcined LDH, with a maximum Ni(II) removal of 290.6 AE 16.4 mg g À1 and 480.4 AE 21.3 mg g À1 at pH 7, respectively. The possible mechanism of the Ni(II) removal can be due to the incorporation of Ni into the layered structure by replacing the

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Section: Possible Ni Removal Mechanismmentioning

confidence: 99%

Synergistic effect of humic and fulvic acids on Ni removal by the calcined Mg/Al layered double hydroxide

Fang

Chen

et al. 2015

RSC Adv.

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“…They have a profound effect on the speciation and mobility of heavy metals in soils and aquifers because they carry a large number of functional groups on their surface that can complex with the metals (Stevenson 1976;Herndorff and Schnitzer 1980;Benedetti et al 1995). Research on Cd pollution has received increasing international attention as Cd is toxic and can cause severe human health problems such as bronchitis, kidney disorders and itai-itai disease (Webb 1979;Alloway 1995).…”

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confidence: 99%

Sorption of cadmium on humic acid: Mechanistic and kinetic studies with atomic force microscopy and X-ray absorption fine structure spectroscopy

Liu¹,

Frenkel²,

Vairavamurthy³

et al. 2001

Can. J. Soil. Sci.

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. 2001. Sorption of cadmium on humic acid: Mechanistic and kinetic studies with atomic force microscopy and X-ray absorption fine structure spectroscopy. Can. J. Soil Sci. 81: 337-348. Humic acids (HA) constitute a major fraction of the organic matter in soils and sediments. Little is known about the kinetics and mechanisms of Cd sorption by HAs, especially those pertaining to the surface features and structure of the Cd-humate complexes. We investigated Cd sorption by HA using the conventional batch method, N 2 -BET method, atomic force microscopy (AFM), and extended X-ray absorption fine structure (EXAFS) spectroscopy to gain a better understanding of the kinetics and mechanisms. Cadmium sorption by HA can be described by the parabolic diffusion equation. The increase in the apparent diffusion coefficient with an increase in the initial Cd concentration was less pronounced at higher initial Cd concentrations, apparently due to an enhancement in aggregation of the Cd-humate complexes. The HA before and after Cd sorption at Cd concentrations ≤ 10 -6 M in different reaction times was spheroidal in shape. The Cd-humate complexes formed at 10 -4 and 10 -3 M Cd gradually changed to resemble the shape of a bean with increasing reaction time, thereby substantially decreasing their specific surface. Cadmium ions raveled the spheroidal HA particles into a bean-like structure by coordinating to six O atoms from the functional groups of HA, with a Cd-O distance of 2.297(2) Å. The Cd-O bond strength decreased with increasing initial Cd concentration.Key words: Cadmium, humate complexes, conformation, atomic force microscopy, EXAFS Liu, C., Frenkel, A. I., Vairavamurthy, A. et Huang, P. M. 2001. Étude de la mécanique et de la cinétique de la sorption du cadmium par l'acide humique au moyen de la microscopie à force atomique et de la spectroscopie des structures fines par absorption des rayons X. Can. J. Soil Sci. 81: 337-348. Les acides humiques (AH) constituent une bonne partie de la matière organique présente dans le sol et les sédiments. On sait peu de choses sur la cinétique et la mécanique de la sorption du Cd par les AH, surtout en relation avec les propriétés de la surface et la structure des complexes Cd-humate. Les auteurs ont étudié la sorption du Cd par les AH selon la méthode par lots traditionnelle, la technique N 2 -BET, la microscopie à force atomique (MFA) et une variante de la spectroscopie des structures fines par absorption des rayons X (EXAFS) dans l'espoir de mieux comprendre la cinétique et la mécanique du phénomène. L'équation de diffusion parabolique décrit la sorption du cadmium par les AH. La hausse du coefficient de diffusion apparent associée à l'augmentation de la concentration initiale de Cd est moins importante quand la concentration initiale de Cd est plus élevée. On le doit apparemment à une meilleure agrégation des complexes Cd-humate. Les AH présentent une forme sphéroïdale avant et après la sorption du Cd (concentration ≤ 10-6 M) à divers temps de réaction. Les complexes Cd-humate qui voi...

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“…Mobility, availability and/or bioavailability of metals is controlled by several factors such as the soil's chemical and physical properties (pH, EC, DOC, temperature, ion charges, etc. ), plant species and their related factors (Soon and Bates, 1982;Sauerbeck and Hein, 1991;Davies, 1992, Smith, Fisher, 2002Weng et al, 2002;Kerndorff, and Schnitzer;1980;Vogeler et al, 2009). It has been reported that the relationships between the mobility of metal concentrations in plants and a given soil are mainly influenced by the soil properties related to the ion charges (Fisher, 2002;Weng et al, 2002;Kerndorffand Schnitzer;1980;Vogeler et al, 2009).…”

Section: Selection Of Soil Factorsmentioning

confidence: 99%

Application of neural network model for the prediction of chromium concentration in phytoremediated contaminated soils

Hattab

Hambli

Motelica-Heino

et al. 2013

Journal of Geochemical Exploration

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The assessment of chromium concentrations in plants requires the quantification of a large number of soil factors that affect their potential availability and subsequent toxicity and a mathematical model that predicts their relative concentrations. Many soil characteristics can change the availability of chromium (Cr) to plants in soils. However, accurate, rapid and simple predictive models of metal concentrations are still lacking in soil and plant analysis. In the present work a novel artificial neural network (ANN) model was developed as an alternative rapid and accurate tool for the prediction of Cr concentration in dwarf bean leaves grown in the laboratory on phytoremediated contaminated soils treated with different amendments. First, sixteen (4x4) soil samples were harvested from a phytoremediated contaminated site located in south-western France. Second, a series of measurements were performed on the soil samples.The inputs are the soil amendment, the soil pH, the soil electrical conductivity and the dissolved organic carbon of the soil and the output is the concentration of Cr in the dwarf bean 2 leaves. Third, an ANN model was developed and its performance was evaluated using a test data set and then applied to predict the exposition of the bean leaves to the Cr concentration versus the soil inputs. The performance of the ANN method was compared with the traditional multi linear regressions method using the training and test data sets. The results of this studyshow that the ANN model trained on experimental measurements can be successfully applied to the rapid prediction of plant exposition to Cr.

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Sorption of metals on humic acid

Cited by 449 publications

References 9 publications

Synergistic effect of humic and fulvic acids on Ni removal by the calcined Mg/Al layered double hydroxide

Synergistic effect of humic and fulvic acids on Ni removal by the calcined Mg/Al layered double hydroxide

Sorption of cadmium on humic acid: Mechanistic and kinetic studies with atomic force microscopy and X-ray absorption fine structure spectroscopy

Application of neural network model for the prediction of chromium concentration in phytoremediated contaminated soils

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