Mechanism and multi-step kinetic modelling of Cr(VI) adsorption, reduction and complexation by humic acid, humin and kerogen from different sources

Barnie, Samuel; Zhang, Jia; Obeng, Peter Appiah; Duncan, Albert Ebo; Adenutsi, Caspar Daniel; Xu, Lin; Chen, Honghan

doi:10.1007/s11356-021-13519-z

Cited by 21 publications

(5 citation statements)

References 40 publications

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“…To investigate the Cr(VI) removal kinetics, pseudo-first-order kinetics (Lagergren equation) and pseudo-second-order kinetics (McKay equation) were adopted in this study. The nonlinear formulas of these kinetic models are shown below 30 , 31 :…”

Section: Methodsmentioning

confidence: 99%

Removal of Cr(VI) by biochar derived via co-pyrolysis of oily sludge and corn stalks

Han

Zhang

et al. 2022

Sci Rep

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The co-pyrolysis of oily sludge with biomass to prepare carbon materials is not only an effective way to mitigate oily sludge pollution, but it is also a method of obtaining carbon materials. In this study, a carbon material (OS-CS AC) was obtained by the direct co-pyrolysis of oily sludge (OS) and corn stalks (CS) and then applied to Cr(VI) removal. According to the hydroxy and carboxy masking experiments and the characterization of OS-CS AC by FT-IR, SEM, XPS, XRD, and N2 physical adsorption–desorption, Cr(VI) can be adsorbed efficiently through pore filling, the surface oxygen-containing functional groups can promote the reduction of Cr(VI) to Cr(III) through electron donors, and the greater the electrostatic attraction between the electron-donating functional groups of OS-CS AC and the Cr(VI) is, the stronger the ability to remove Cr(VI). In addition, the removal process was discussed, and the results indicated that the McKay kinetic model, Langmuir isotherm model and Van't Hoff thermodynamic model were the most suitable models for removal. The main factors affecting the removal of Cr(VI) were discussed, and the removal of Cr(VI) reached 99.14%, which gives a comprehensive utilization way of oily sludge and corn stalks.

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Section: Methodsmentioning

confidence: 99%

Removal of Cr(VI) by biochar derived via co-pyrolysis of oily sludge and corn stalks

Han

Zhang

et al. 2022

Sci Rep

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“…Notably, the assigned chromium peak specifically identifies hexavalent chromium, trivalent chromium and chromium metal. Hexavalent chromium can be attributed to leached strontium chromate, while trivalent chromium can be linked to chromium hydroxide, indicating the presence of a protective layer in the bare aluminium regions [41][42][43][44][45][46]. This lends support to the hypothesis that the leaching of strontium chromate particles from the coating resulted in the formation of a protective layer of chromium hydroxide onto which hexavalent chromium is adsorbed, forming Cr 3+ -O-Cr 6+ bonds over the intermetallic particles of the aluminium alloy AA2024-T62.…”

Section: Erosion At the Tipmentioning

confidence: 99%

Unravelling Corrosion Degradation of Aged Aircraft Components Protected by Chromate-Based Coatings

Mol,

Homborg,

't Hoen-Velterop

et al. 2024

Preprint

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“…Corresponding intensities of the 3500 and 1695 cm À1 peaks on the surfaces of the reacted HC and THC dramatically decreased following Cr (VI) adsorption, suggesting that the Cr(VI) elimination may be aided by O-H and C=O groups [47]. It has been claimed that the O-H group can act as an electron donor to convert Cr(VI) to Cr (III) [48]. On the other hand, C-O peaks grew stronger.…”

Section: Experiments On the Desorption Processmentioning

confidence: 99%

Production of hydrochar from corn silk by hydrothermal carbonization technique and its modification for more effective removal of Cr(VI)

Ekinci

2023

J Chinese Chemical Soc

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The objective of this project was to develop a new bioproduct that will utilize agricultural waste and modify the product to increase its present adsorption capacity. After the hydrothermal carbonization of corn silk, a novel hydrochar was generated and treated using sulfuric acid to boost its adsorption capacity. FT‐IR, SEM–EDX, TGA, and BET surface analysis studies were used to analyze the structure of the produced biosorbents. According to the EDX analysis results, there are C, H, and N elements in the hydrochar structure, and the treated hydrochar contains S in addition to these elements. While the presence of several functional groups was indicated by FT‐IR data, post‐adsorption EDX analysis proved that Cr ions were adhering to hydrochar. The proper parameters for the adsorption processes for both biosorbents were established. By analyzing the outcomes of kinetics tests at various concentrations and isotherm experiments, the adsorption procedure was identified. The pseudo‐second‐order kinetic model was shown to be consistent with the kinetic pathways of adsorptions. Although the results of the isotherm experiments also suited the Langmuir isotherm, the Freundlich isotherm had higher R2 values and was more consistent with the results. The outcomes demonstrated that sulfuric acid‐modified hydrochar offered greater Cr(VI) adsorption capacity. qm values defining the maximum adsorption capacities of HC and THC at a temperature of 333 K were estimated to be 263.16 and 294.12 mg g−1, in that order. Based on the qm values, the adsorption capabilities of HC and THC were compared with those of a few other adsorbents. THC (29.11 m2 g−1) had a 29% larger surface area than HC (22.57 m2 g−1), according to the surface area of BET test results.

show abstract

Mechanism and multi-step kinetic modelling of Cr(VI) adsorption, reduction and complexation by humic acid, humin and kerogen from different sources

Cited by 21 publications

References 40 publications

Removal of Cr(VI) by biochar derived via co-pyrolysis of oily sludge and corn stalks

Removal of Cr(VI) by biochar derived via co-pyrolysis of oily sludge and corn stalks

Unravelling Corrosion Degradation of Aged Aircraft Components Protected by Chromate-Based Coatings

Production of hydrochar from corn silk by hydrothermal carbonization technique and its modification for more effective removal of Cr(VI)

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