Adsorption of chromium (VI) and iron (III) ions onto acid-modified kaolinite: Isotherm, kinetics and thermodynamics studies

Dim, Paul Egwuonwu; Mustapha, L.S.; Termtanun, Mutsee; Okafor, J. O.

doi:10.1016/j.arabjc.2021.103064

Cited by 55 publications

(38 citation statements)

References 48 publications

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“…The prominent bands at 20.9, 26.8, 33.4, 35.7, 41.9, 54.6, and 68.1 are characteristic bands that confirm the presence of a kaolinite mineral and quartz in the prepared nanocomposite. 45 , 50 , 51 The occurrence of more kaolinite approves the increase in the pore sizes of the prepared nanocomposite. 45 …”

Section: Resultsmentioning

confidence: 85%

“… 45 , 50 , 51 The occurrence of more kaolinite approves the increase in the pore sizes of the prepared nanocomposite. 45 …”

Section: Resultsmentioning

confidence: 85%

“…Microstructures of the original particles demonstrated that the particles are composed of a highly crystalline form of sheets like polygonal flakes and are structured to form the stacks. 45 , 46 Figure 1 also shows the surface morophology of the prepared nanocomposite at different magnifications. The micrograph of the prepared nanocomposite illustrates a vital change in the morophology structures compared with the original Tafla.…”

Section: Resultsmentioning

confidence: 99%

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NanoTafla Nanocomposite as a Novel Low-Cost and Eco-Friendly Sorbent for Strontium and Europium Ions

et al. 2022

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Now the wide use of nanooxides is attributed to their remarkable collection of properties. Nanocomposites have an impressive variety of important applications. A thermal decomposition approach provides a more optimistic method for nanocrystal synthesis due to the low cost, high efficiency, and expectations for large-scale production. Therefore, in this study a new eco-friendly nanooxide composite with sorption characteristics for europium (Eu(III)) and strontium (Sr(II)) was synthesized by a one-step thermal treatment process using earth-abundant tafla clay as a starting material to prepare a modified tafla (M-Taf) nanocomposite. The synthesized nancomposite was characterized by different techniques before and after sorption processes. Different factors that affected the sorption behavior of Eu(III) and Sr(II) in aqueous media by the M-Taf nanocomposite were studied. The results obtained illustrated that the kinetics of sorption of Eu(III) and Sr(II) by the M-Taf nanocomposite are obeyed according to the pseudo-second order and controlled by a Langmuir isotherm model with maximum sorption capacities ( Q max ) of 25.5 and 23.36 mg/g for Eu(III) and Sr(II), respectively. Also, this novel low-cost and eco-friendly sorbent has promising properties and can be used to separate and retain some radionuclides in different applications.

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Section: Resultsmentioning

confidence: 85%

“… 45 , 50 , 51 The occurrence of more kaolinite approves the increase in the pore sizes of the prepared nanocomposite. 45 …”

Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

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NanoTafla Nanocomposite as a Novel Low-Cost and Eco-Friendly Sorbent for Strontium and Europium Ions

et al. 2022

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“…Hexavalent chromium is highly dangerous because of its carcinogenic character and is almost 100 times more toxic than the trivalent form [6]. A high concentration of Cr(VI) causes respiratory diseases, lung carcinomas, and allergies [7]. Chromium exists in various anionic forms in solution based on the pH of the solution.…”

Section: Introductionmentioning

confidence: 99%

Bio-Stimulated Adsorption of Cr(VI) from Aqueous Solution by Groundnut Shell Activated Carbon@Al Embedded Material

Vaddi¹,

Gurugubelli²,

Koutavarapu

et al. 2022

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In this study, a low-cost bioadsorbent aluminum metal blended with groundnut shell activated carbon material (Al-GNSC) was used for Cr(VI) adsorption from aqueous solutions. Al-GNSC was prepared and characterized using Fourier transform infrared spectrometer (FT-IR), scanning electron microscopic (SEM) and X-ray diffraction (XRD) to determine its surface morphology. Batch studies were performed and the optimum conditions for maximum Cr(VI) removal (of 94.2%) were found at pH 4.0, initial concentration 100 mg/L, adsorbent dosage 8 g/L of Cr(VI) solution, and time of contact 50 min. Moreover, the Langmuir isotherm model (maximum adsorption capacity of 13.458 mg/g) was the best fit and favored the mono-layered Cr(VI) adsorption. The kinetic studies reveal that the pseudo-second-order model was the best fit and favored chemisorption as the rate-limiting step. The desorption study revealed that Cr(VI) leached with sodium hydroxide solution acted as a regenerating agent. It is proved that Al-GNSC removes the Cr(VI) content in groundwater samples. The methodology developed using the Al-GNSC adsorbent as an alternative for the adsorption of Cr(VI) ions is remarkably successful in this study.

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“…For example, modified electrodes for electrochemical applications were synthesized in a two steps procedure, first grafting triethanolamine on the interlayer aluminol groups and then reacting with iodomethane for cyanide anions detection [ 5 ]. Raw clays treated with hydrochloric acid and acetic acid were tested for adsorption of Cr (VI) and Fe (III) [ 6 ] and kaolin/polymer nanocomposite membranes were prepared for the removal of arsenic from aqueous solutions [ 7 ]. The detection of iodide in aqueous solution containing thiosulfate was reported onto a gold electrode modified by a thin film of kaolinite, obtained by grafting the ionic liquid (1-(2-hydroxyethyl)-4-(tert-butyl) pyridinium chloride) [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Kaolinite Thin Films Grown by Pulsed Laser Deposition and Matrix Assisted Pulsed Laser Evaporation

et al. 2022

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In this work, thin films of lamellar clays were deposited by laser techniques (matrix assisted pulsed laser evaporation (MAPLE) and pulsed laser deposition (PLD)). The focus of this paper is the optimization of deposition parameters for the production of highly oriented crystalline films. The films were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and scanning electron microscopy (SEM). Contact angle measurements were employed to identify the wetting properties of the deposited thin films. Hydrophobic to superhydrophilic films can be prepared by using different deposition techniques and deposition parameters. MAPLE led to superhydrophilic films with contact angles in the range 4°–8°, depending on the microstructure and surface roughness at micro and nano scale. The 1064 nm PLD had a high deposition rate and produced a textured film while at λ = 193 nm an extremely thin and amorphous layer was depicted. Oriented kaolinite films were obtained by MAPLE even at 5 wt.% kaolinite in the target.

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Adsorption of chromium (VI) and iron (III) ions onto acid-modified kaolinite: Isotherm, kinetics and thermodynamics studies

Cited by 55 publications

References 48 publications

NanoTafla Nanocomposite as a Novel Low-Cost and Eco-Friendly Sorbent for Strontium and Europium Ions

NanoTafla Nanocomposite as a Novel Low-Cost and Eco-Friendly Sorbent for Strontium and Europium Ions

Bio-Stimulated Adsorption of Cr(VI) from Aqueous Solution by Groundnut Shell Activated Carbon@Al Embedded Material

Kaolinite Thin Films Grown by Pulsed Laser Deposition and Matrix Assisted Pulsed Laser Evaporation

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