Clays and Clay Minerals: Long-Lasting Applications in Environmental Remediation

Wijesooriya, Madhuni; Wijesekara, Hasintha; Bolan, Nanthi; Rajapaksha, Anushka Upamali; Vithanage, Meththika

doi:10.1007/978-981-99-2544-5_1

Advances in Material Research and Technology

2023

DOI: 10.1007/978-981-99-2544-5_1

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Clays and Clay Minerals: Long-Lasting Applications in Environmental Remediation

Madhuni Wijesooriya

Hasintha Wijesekara

Nanthi Bolan

et al.

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2024

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Cited by 2 publications

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Catalytic Activity of Phenol Oxidation over Iron and Cooper-Exchanged Pillared Bentonite

Chellal,

Hamidouche,

Boudieb

et al. 2024

Chemistry Africa

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Al, mixed Al-Fe and Al-Cu pillared clays were prepared. The solids were characterized by X-ray diffraction (XRD), N 2 adsorption and H 2 -TPR. The dispersion of the cold clay suspension, before the pillaring, increases the basal spacing and the speci c surface area. CWPO of phenol under mild conditions (25 °C, 1 atm) was carried out without correction of pH. Mixed Al-Fe and Al-Cu pillared clays have comparable performances, although they showed some differences in the H 2 O 2 decomposition kinetics. A total conversion of H 2 O 2 is obtained without the complete phenol conversion over mixed Al-Fe pillared clays suggesting the presence of active species in these catalysts. In a slight excess of H 2 O 2 , the activity increased for all iron-based clays catalysts with the increase in Fe content. A total conversion of phenol is obtained after 15 h of reaction over Fe/MR-AlFe(10) and after extending the reaction time to 30 h in the presence of Fe/MR-Al. While MR-AlFe(10) only converted 57.12% under the same conditions. MR-AlFe(10) has the greater basal space (17.44 Å) and is more active for H 2 O 2 decomposition than Fe/MR-Al, which certainly allowed greater accessibility of the reactant to the iron species. Iron exchanged and postpillared clay with mixed (Al-Fe) solution containing 10% of iron expressed as molar percentage {Fe/MR-AlFe (10)} was the most e cient for this reaction combining good catalytic activity with high stability against iron leaching (0.02%). It showed a total phenol degradation, the highest H 2 O 2 decomposition (85.7%) and more than 80% of TOC removal after 15 h of reaction.

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Catalytic Activity of Phenol Oxidation over Iron and Cooper-Exchanged Pillared Bentonite

Chellal,

Hamidouche,

Boudieb

et al. 2024

Chemistry Africa

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Sorption Properties of Bentonite-Based Organoclays with Amphoteric and Nonionic Surfactants in Relation to Polycyclic Aromatic Hydrocarbons

Dudnikova,

Burachevskaya,

Minkina

et al. 2024

Minerals

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Polycyclic aromatic hydrocarbons (PAHs) are a major scientific challenge due to their profound impact on public and environmental health. Therefore, studying ways to detoxify PAHs is important. In this research, the adsorption ability of bentonite modified with five surfactants, including amphoteric (cocoamphodiacetate disodium and sodium cocoiminodipropionate) and nonionic (lauramine oxide, cocamide diethanolamine, and alkylpolyglucoside) substances for the adsorption of high-molecular benzo(a)pyrene and low-molecular naphthalene from the PAH group was studied. The bentonite and bentonite-based organoclays were characterized using X-ray diffraction and Fourier transform infrared spectroscopy. The results showed that the maximum adsorption of benzo(a)pyrene by organoclays increased compared with the initial mineral. The adsorption of benzo(a)pyrene is higher than that of naphthalene. The adsorption process of benzo(a)pyrene by bentonite and organoclays is predominantly monolayer, as it is better described by the Langmuir model (R2 0.77–0.98), while naphthalene is predominantly multilayer, described by the Freundlich model (R2 0.86–0.96). According to the effectiveness of sorption capacities of organoclays—including the degree of sorption, Langmuir and Freundlich constants, the value of maximum adsorption, Gibbs free energy, and the index of favorability of the adsorption process—the most effective modification was found. For the adsorption of benzo(a)pyrene the best was cocoamphodiacetate disodium, and for naphthalene it was sodium cocoiminodipropionate.

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Clays and Clay Minerals: Long-Lasting Applications in Environmental Remediation

Cited by 2 publications

References 82 publications

Catalytic Activity of Phenol Oxidation over Iron and Cooper-Exchanged Pillared Bentonite

Catalytic Activity of Phenol Oxidation over Iron and Cooper-Exchanged Pillared Bentonite

Sorption Properties of Bentonite-Based Organoclays with Amphoteric and Nonionic Surfactants in Relation to Polycyclic Aromatic Hydrocarbons

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