Synthesis of cellulose fibers/Zeolite-A nanocomposite as an environmental adsorbent for organic and inorganic selenium ions; Characterization and advanced equilibrium studies

Ashraf, Menna-Tullah; AlHammadi, Ali A.; El-Sherbeeny, Ahmed M.; Alhammadi, Salh; Zoubi, Wail Al; Supervison, Young Gun. Ko; Abukhadra, Mostafa R.

doi:10.1016/j.molliq.2022.119573

Cited by 42 publications

(44 citation statements)

References 49 publications

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“…Such observations validate the structural changes from the raw phyllosilicate kaolinite into tectosilicate zeolite-A. This conversion is also associated with significant exposure for the active siloxane groups (Si-OH and Al-OH) as a result of the alkaline etching effect causing intensification in the characteristic bands of -OH (Figure 2C) [35,36]. The main detectable functional groups of H.ZA are Si-O (452.1 and 705 cm −1 ), Si-O-Al (555.02 and 630 cm −1 ), Si-O-Si (990 cm −1 ), adsorbed O-H (1652 cm −1 ), zeolitic water (1475 cm −1 ), Si-OH (3612 cm −1 ), and Al-OH (3422 cm −1 ) (Figure 2C) [37].…”

Section: Ft-ir Analysissupporting

confidence: 76%

“…The H.ZA and DH.ZA weight percentages during the reactions strongly affect the conversion rate and efficiency of FAME, as the presence of the catalysts at the satisfied quantities ensures the availability of the required active catalytic sites in the system [35]. The influence of H.ZA and DH.ZA loadings were assessed from 1 wt.…”

Section: Effects Of the Catalyst Dosages On Fame Yieldmentioning

confidence: 99%

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Kinetic, Thermodynamic, and Mechanistic Studies on the Effect of the Preparation Method on the Catalytic Activity of Synthetic Zeolite-A during the Transesterification of Waste Cooking Oil

et al. 2022

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Egyptian kaolinite was applied in the synthesis of zeolite-A by conventional hydrothermal and alkali fusion methods, resulting in two forms of zeolite-A: the hydrated phase (H.ZA) and the dehydrated phase (DH.ZA). The DH.ZA phase exhibits an enhanced surface area (488 m2/g), total basicity (7.73 mmol OH/g), high sodium content (20.2%), and a narrow particle size distribution (5 to 25 µm) as compared to the H.ZA phase (423 m2/g surface area, 5.88 mmol OH/g total basicity, 13.3% sodium content, and 10 to 45 µm particle size distribution). DH.ZA exhibits enhanced catalytic activity, achieving a biodiesel yield of 96.8% after 60 min at 60 °C, while the application of H.ZA resulted in a 95.8% yield after 120 min at 80 °C. The controlled transesterification mechanism in the presence of H.ZA and DH.ZA involved robust base-catalyzed reactions. The reactions follow the pseudo-first-order kinetics, and the rate constants (Kc) were determined at three different temperature values (40, 50 and 60 °C). The activation energies using H.ZA (35.9 kJ.mol−1) and DH.ZA (32.714 kJ.mol−1) demonstrates their efficiencies in mild conditions. The thermodynamic parameters of enthalpy (33.23 kJ.mol−1 (H.ZA) and 30.03 kJ.mol−1 (DH.ZA)), Gibb’s free energy (65.164 kJ.mol−1 (H.ZA) and 65.268 kJ.mol−1 (DH.ZA)), and entropy (−195.59 J.K−1.mol−1 (H.ZA) and −195.91 J.K−1.mol−1 (DH.ZA)) demonstrate the spontaneous and endothermic behaviours of these reactions. The obtained biodiesel matches the physical properties of the international standards, and the recyclability properties of the two zeolite phases demonstrate their suitability for commercial-scale applications.

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Section: Ft-ir Analysissupporting

confidence: 76%

Section: Effects Of the Catalyst Dosages On Fame Yieldmentioning

confidence: 99%

Kinetic, Thermodynamic, and Mechanistic Studies on the Effect of the Preparation Method on the Catalytic Activity of Synthetic Zeolite-A during the Transesterification of Waste Cooking Oil

et al. 2022

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“…The main chemical groups of the raw coal and sulfonated coal products are affected by strong deprotonation reactions under the basic environment which create numerous hydroxyl ions of negative charges. Therefore, the basic conditions during the adsorption of the dyes keep the surfaces of the coal products with numerous negative charges, which are a favorable state for the significant electrostatic attractions of MG molecules that are of positive charges. , This was supported by the determined pH (ZPC) values of N.C (6.2), MS.C (5.7), and SS.C (5.2) that demonstrate the high saturation of their surface s with negative charges beyond these values. Therefore, pH 9 was selected to conduct the further MG adsorption tests either by N.C, MS.C, and SS.C.…”

Section: Resultsmentioning

confidence: 92%

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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“…The presented results validate that the treated coal products, either by sulfuric acid or nitric acid, are low-cost and highly effective adsorbents for the antibiotic residuals from water and can be increased up to the realistic and commercial-scale applications. (Ali et al, 2021;Ashraf et al, 2022). The adsorption energy (ΔE) can be calculated theoretically from Eq.…”

Section: Density Of the Adsorption Sites (Nm)mentioning

confidence: 99%

Insight into the effects of H2SO4 and HNO3 acidification processes on the properties of coal as an enhanced adsorbent for ciprofloxacin residuals: Steric and energetic studies

Al-Labadi

Shemy²,

Ghidan³

et al. 2023

Front. Chem.

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A sub-bituminous natural coal sample (R.C) was treated with sulfuric acid (S.C) and nitric acid (N.C) as modified products and enhanced adsorbents for obtaining ciprofloxacin (CFX) antibiotic residuals from water. The characterization studied demonstrates enhancement in the surface area and the incorporation of new active oxygenated, sulfur-bearing, and nitrogen-bearing chemical groups into the structure of coal samples. This was reflected in the adsorption capacities that were enhanced from 164.08 mg/g (R.C) to 489.2 mg/g and 518.5 mg/g for N.C and S.C, respectively. The impact of the acid modification processes was evaluated based on the energetic and steric properties of their adsorption systems considering the parameters of the advanced monolayer equilibrium model with one energy site. The determined occupied active sites’ density of R.C (46.32–61.44 mg/g), N.C (168.7–364.9 mg/g), and S.C (159.2–249.9 mg/g) reflects an increase in the quantities of active centers after the acid treatment processes, especially with HNO3. The higher efficiencies of the active sites of S.C to adsorb more CFX molecules (n = 2.08–2.31) than N.C (n = 1.41–2.16) illustrate its higher adsorption capacity. The energetic investigation [adsorption (˂40 kJ/mol) and Gaussian (˂8 kJ/mol) energies] suggested adsorption of CFX by N.C and S.C mainly by physical processes such as van der Waals forces, hydrogen bonding, dipole bonding, and π–π interactions. Moreover, the determined thermodynamic functions including entropy, internal energy, and free enthalpy reflect the spontaneous and endothermic uptake of CFX on the surfaces of N.C and S.C.

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Synthesis of cellulose fibers/Zeolite-A nanocomposite as an environmental adsorbent for organic and inorganic selenium ions; Characterization and advanced equilibrium studies

Cited by 42 publications

References 49 publications

Kinetic, Thermodynamic, and Mechanistic Studies on the Effect of the Preparation Method on the Catalytic Activity of Synthetic Zeolite-A during the Transesterification of Waste Cooking Oil

Kinetic, Thermodynamic, and Mechanistic Studies on the Effect of the Preparation Method on the Catalytic Activity of Synthetic Zeolite-A during the Transesterification of Waste Cooking Oil

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 effects of H2SO4 and HNO3 acidification processes on the properties of coal as an enhanced adsorbent for ciprofloxacin residuals: Steric and energetic studies

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Synthesis of cellulose fibers/Zeolite-A nanocomposite as an environmental adsorbent for organic and inorganic selenium ions; Characterization and advanced equilibrium studies

Cited by 42 publications

References 49 publications

Kinetic, Thermodynamic, and Mechanistic Studies on the Effect of the Preparation Method on the Catalytic Activity of Synthetic Zeolite-A during the Transesterification of Waste Cooking Oil

Kinetic, Thermodynamic, and Mechanistic Studies on the Effect of the Preparation Method on the Catalytic Activity of Synthetic Zeolite-A during the Transesterification of Waste Cooking Oil

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 effects of H2SO4 and HNO3 acidification processes on the properties of coal as an enhanced adsorbent for ciprofloxacin residuals: Steric and energetic 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