New insights into the surface oxidation role in enhancing Congo red dye uptake by Egyptian ilmenite ore: Experiments and physicochemical interpretations

Ali, Rabea A.M.; Mobarak, Mohamed; Badawy, Aliaa M.; Lima, Éder C.; Seliem, Moaaz K.; Ramadan, H.S.

doi:10.1016/j.surfin.2021.101316

Cited by 28 publications

(36 citation statements)

References 38 publications

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“…This signifies the uptake of MG on the surfaces of the coal products in nonparallel and/or vertical orientation by multimolecular mechanisms. , Moreover, the previous values validate the suitability of the active sites on the surfaces of MS.C and SS.C to adsorb up to three molecules of MG as compared to two molecules by the active sites of N.C. The remarkable increase in the number of MG molecules that were adsorbed by the active sites of N.C, MS.C, and SS.C demonstrates a considerable increase in the aggregation behaviors of the dye molecules (Figure D). − …”

Section: Resultssupporting

confidence: 59%

Insight into the Effect of Sulfonation Techniques on the Adsorption Properties of −SO₃H Surface-Functionalized Coal as Adsorbent for Malachite Green Dye: Steric and Energetic Investigation

et al. 2022

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Natural coal (N.C) was sulfonated with sulfuric acid by normal stirring (MS.C) and sonication waves (SS.C) to obtain −SO3H functionalized coal as enhanced adsorbents of malachite green dye (MG). The sulfonated products exhibit enhanced surface area (MS.C (27.2 m2/g) and SS.C (45.8 m2/g)) as compared to N.C. SS.C achieved higher acid density (14.2 mmol/g) and sulfur content (13.2 wt. %) as compared to MS.C. The impact of the sulfonation processes on the adsorption of MG was assessed based on the monolayer isotherm model of one energy. The MG Q sat of N.C (121.3 mg/g), MS.C (226.3 mg/g), and SS.C (296.4 mg/g) validate the significant effect of the sulfonation processes by the sonication waves. This is in agreement with the active site densities that reflect the saturation of SS.C by more active sites (180.74 mg/g) than MS.C (120.38 mg/g) and N.C (70.84 mg/g). The MS.C and SS.C can adsorb three MG molecules as compared to two molecules per site of N.C. The Gaussian energy (<8 kJ/mol) and adsorption energy (<40 kJ/mol)) reflects the physisorption of MG involving van der Waals forces, hydrogen bonding, and dipole bonding forces. The thermodynamic functions demonstrate the uptake of MG by exothermic, spontaneous, feasible reactions.

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Section: Resultssupporting

confidence: 59%

Insight into the Effect of Sulfonation Techniques on the Adsorption Properties of −SO₃H Surface-Functionalized Coal as Adsorbent for Malachite Green Dye: Steric and Energetic Investigation

et al. 2022

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“…), and hydrogen bonding (o30 kJ mol À1 )). 42,44 The adsorption energies estimated during the uptake of MPn (18.4 to 19.85 kJ mol À1 ), OM (3.52 to 3.67 kJ mol À1 ), and AC (4.3 to 4.65 kJ mol À1 ) by CD/Ph are within the range of physisorption processes (Table 3). This involved hydrogen bonding and/or van der Waals forces and/or dipole bonding forces.…”

Section: Steric Parameters Number Of Adsorbed Molecules Per Site (N)mentioning

confidence: 83%

“…7(D) and Table 3). 42,43 Density of the active sites (N m ). The determination of the N m values reflects the density of the effective adsorption sites on the surfaces of the CD/Ph particles during the MPn, OM, and AC uptake reactions (Fig.…”

Section: Steric Parameters Number Of Adsorbed Molecules Per Site (N)mentioning

confidence: 99%

“…Additionally, this reflects the positive influence of the temperature in activating or inducing the formation of new active sites on the surfaces of CD/Ph particles. 42 The adsorption capacities at the saturation state of (Q sat ). The theoretical adsorption capacities of the CD/Ph particles used as adsorbents for MPn, OM, and AC at their saturation states (Q sat ) represent the most appropriate maximum adsorption values as compared to the obtained values from the classic isotherm models (Fig.…”

Section: Steric Parameters Number Of Adsorbed Molecules Per Site (N)mentioning

confidence: 99%

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Insight into the adsorption properties of a β-cyclodextrin/phillipsite organophilic composite for effective removal of toxic organophosphorus pesticides: kinetic and advanced equilibrium studies

et al. 2022

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“…The physical uptake mechanisms indicate adsorption energies of <40 kJ/mol and can be classified into five adsorption processes. These processes involve hydrogen bonding (<30 kJ/mol), van der Waals forces (4–10 kJ/mol), hydrophobic bonding (5 kJ/mol), coordination exchange processes (40 kJ/mol), and forces dipole bonding (2–29 kJ/mol). , The obtained energies for CR adsorption on Fe/GP (5.12–5.79 kJ/mol) reflect the physical uptake of the dye molecules by one or more processes, including hydrogen bonding, van der Waals forces, hydrophobic bonding, and forces dipole bonding (Table ).…”

Section: Resultsmentioning

confidence: 99%

Enhanced Congo Red Adsorption and Photo-Fenton Oxidation over an Iron-Impeded Geopolymer from Ferruginous Kaolinite: Steric, Energetic, Oxidation, and Synergetic Studies

et al. 2022

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An iron-impeded geopolymer (Fe/GP) was synthesized from natural ferruginous kaolinite and optical waste for enhanced decontamination of Congo red (CR) dye. The adsorption properties of Fe/GP were assessed using an advanced monolayer equilibrium model of one energy ( R 2 > 0.99). Fe/GP possessed an active site density of 391.3 mg/g, which induced an adsorption capacity of 634 mg/g at the saturation state. The number of adsorbed CR molecules per site ( n = 1.56–1.62) reflected the possible uptake of two molecules per site via a multimolecular mechanism. The adsorption energy (5.12–5.7 kJ/mol) reflected the physical adsorption of the CR molecules via hydrogen bonding and/or van der Waals forces. As a catalyst, notable activity toward photo-Fenton oxidation was achieved even at high CR concentrations. Complete oxidation was observed after 30 (CR concentration: 10 mg/L), 50 (20 mg/L), 80 (30 mg/L), 120 (40 mg/L), and 140 min (50 mg/L). High oxidation efficiency was achieved using 0.1 g/L Fe/GP, 0.1 mL of hydrogen peroxide (H 2 O 2 ), and a visible light source. Increasing the Fe/GP dosage to 0.3 g/L resulted in complete oxidation of CR (100 mg/L) after 220 min. Therefore, synthetic Fe/GP can be used as a low-cost and superior catalyst and adsorbent for the removal of CR-based contaminants via adsorption or advanced oxidation processes.

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New insights into the surface oxidation role in enhancing Congo red dye uptake by Egyptian ilmenite ore: Experiments and physicochemical interpretations

Cited by 28 publications

References 38 publications

Insight into the Effect of Sulfonation Techniques on the Adsorption Properties of −SO₃H Surface-Functionalized Coal as Adsorbent for Malachite Green Dye: Steric and Energetic Investigation

Insight into the Effect of Sulfonation Techniques on the Adsorption Properties of −SO₃H Surface-Functionalized Coal as Adsorbent for Malachite Green Dye: Steric and Energetic Investigation

Insight into the adsorption properties of a β-cyclodextrin/phillipsite organophilic composite for effective removal of toxic organophosphorus pesticides: kinetic and advanced equilibrium studies

Enhanced Congo Red Adsorption and Photo-Fenton Oxidation over an Iron-Impeded Geopolymer from Ferruginous Kaolinite: Steric, Energetic, Oxidation, and Synergetic Studies

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New insights into the surface oxidation role in enhancing Congo red dye uptake by Egyptian ilmenite ore: Experiments and physicochemical interpretations

Cited by 28 publications

References 38 publications

Insight into the Effect of Sulfonation Techniques on the Adsorption Properties of −SO3H Surface-Functionalized Coal as Adsorbent for Malachite Green Dye: Steric and Energetic Investigation

Insight into the Effect of Sulfonation Techniques on the Adsorption Properties of −SO3H Surface-Functionalized Coal as Adsorbent for Malachite Green Dye: Steric and Energetic Investigation

Insight into the adsorption properties of a β-cyclodextrin/phillipsite organophilic composite for effective removal of toxic organophosphorus pesticides: kinetic and advanced equilibrium studies

Enhanced Congo Red Adsorption and Photo-Fenton Oxidation over an Iron-Impeded Geopolymer from Ferruginous Kaolinite: Steric, Energetic, Oxidation, and Synergetic Studies

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Insight into the Effect of Sulfonation Techniques on the Adsorption Properties of −SO₃H Surface-Functionalized Coal as Adsorbent for Malachite Green Dye: Steric and Energetic Investigation

Insight into the Effect of Sulfonation Techniques on the Adsorption Properties of −SO₃H Surface-Functionalized Coal as Adsorbent for Malachite Green Dye: Steric and Energetic Investigation