Preparation of Al/Fe-PILC clay catalysts from concentrated precursors: enhanced hydrolysis of pillaring metals and intercalation

Vallejo, Carlos; Galeano, Luis-Alejandro; Trujillano, Raquel; Vicente, M.A.; Gil, A.

doi:10.1039/d0ra08948f

Cited by 8 publications

(3 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The particle size was 250 µm (60-mesh) to facilitate its separation from the reaction medium. Detailed procedure of preparation is available elsewhere [14,15]. Physicochemical Characterization of the Al/Fe-PILC Catalyst Powder X-Ray Diffraction (XRD) patterns were recorded in the range (2-70 • 2θ) in a Bruker D8 Advance diffractometer at 40 kV and 30 mA under scanning rate of 2 • (2θ)/min, using filtered CuKα radiation (λ: 1.5416 Å), in order to determine the effect of the pillaring procedure over the starting clay's basal spacing d 001 .…”

Section: Al/fe-pilc Catalystmentioning

confidence: 99%

“…On the other hand, the Al/Fe-pillared interlayered clays (Al/Fe-PILCs) are a class of microporous solids stabilizing "pillars" of Al/Fe mixed oxides whose main role is achieving the layered material to remain expanded, thus preventing its collapse [13]. The clay pillaring greatly improves the specific surface, microporous content and the chemical stability of the incorporated iron in the pillared material [14,15]; Al/Fe-PILCs are lowcost materials that have displayed low iron leaching in the CWPO degradation of phenol solutions (below 0.3 mg/dm 3 ) [16]. The CWPO method activated by aluminum/iron pillared clays (Al/Fe-PILC) has shown to be an efficient AOP to remove synthetic NOM (0.1-0.7 mg/dm 3 ) [17], as well as hazardous pathogens from drinking water treatment effluents [18] in absence of radiation; it implies negligible contribution of the dissolved active metal from the catalyst to the homogeneous, classic Fenton activation of the H 2 O 2 added, and at the same time increased catalyst's lifetime.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Visible-Light Enhanced Catalytic Wet Peroxide Oxidation of Natural Organic Matter in the Presence of Al/Fe-Pillared Clay

et al. 2021

Self Cite

View full text Add to dashboard Cite

An Al/Fe-pillared clay catalyst (Al/Fe-PILC) prepared from low cost technical-grade reagents has been investigated in the photocatalytic Wet Peroxide Oxidation (photo-CWPO) of dissolved Natural Organic Matter (NOM) under circumneutral pH. The successful pillaring of the layered clay material was confirmed by X-ray diffraction (XRD), N2 adsorption at −196 °C, cation exchange capacity (CEC) and simultaneous thermal analysis (TGA/DSC). High levels of mineralization of the dissolved organic carbon and color removal of a synthetic NOM surrogate solution were achieved even under natural lab’s lighting and ambient temperature and pressure, whereas the absence of radiation (in dark) was found to strongly affect the performance of the degradation. The photo-CWPO of NOM activated by the Al/Fe-PILC clay catalyst under visible light irradiation (LED lamp, 450 and 550 nm peaks) displayed a DOC mineralization of 72% and color removal of 73% in just 210 min of irradiation at neutral pH, whereas both responses decayed under ultraviolet lightning (λ: 365 nm) to 41% and 58%, respectively. This behavior is ascribed to formation of triplet states of natural organic matter (3NOM*) by absorption of visible light, which seems to synergistically improve the rate-determining step of the heterogeneous Fenton process, namely reduction of Fe3+ into Fe2+ on the surface of the clay catalyst. Interestingly, experiments performed at neutral and pH 3.0 showed very similar efficiencies under visible light irradiation; these findings may really facilitate the application of the photo-CWPO process to assist conventional drinking water treatment plants in the removal of NOM before the typical disinfection by chlorine to produce safer drinking water.

show abstract

Section: Al/fe-pilc Catalystmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Visible-Light Enhanced Catalytic Wet Peroxide Oxidation of Natural Organic Matter in the Presence of Al/Fe-Pillared Clay

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…The work [14] prepared Al/Fe-and other Al-based pillared clays from concentrated precursors by decreasing the volume of solution per mass unit of clay is required, in comparison to the widespread conventional preparation using highly diluted Al-based pillaring solutions. The best catalyst tested in the CWPO of phenol under very mild conditions through 1.0 h of reaction at pH = 3.7 exhibited 79.1% phenol conversion, 19.3% TOC mineralization, and pretty low iron leaching (0.037 mg Fe/dm 3 ; ~0.12% w/w).…”

Section: Introductionmentioning

confidence: 99%

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

Chellal,

Hamidouche,

Boudieb

et al. 2024

Chemistry Africa

View full text Add to dashboard Cite

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.

show abstract

Transforming wastewater treatment: Recent advancements in Catalytic Wet Air Oxidation with pillared clay catalysts for phenol remediation

Zamisa,

Seadira,

Baloyi

2024

Environmental Pollution

View full text Add to dashboard Cite

Preparation of Al/Fe-PILC clay catalysts from concentrated precursors: enhanced hydrolysis of pillaring metals and intercalation

Abstract: Significantly intensified preparation of Al/Fe-hydrolysed-pillaring solutions and solvent-free intercalation of bentonites yielding Al/Fe-PILCs highly active in catalytic wet peroxide oxidation.

Cited by 8 publications

References 39 publications

Visible-Light Enhanced Catalytic Wet Peroxide Oxidation of Natural Organic Matter in the Presence of Al/Fe-Pillared Clay

Visible-Light Enhanced Catalytic Wet Peroxide Oxidation of Natural Organic Matter in the Presence of Al/Fe-Pillared Clay

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

Transforming wastewater treatment: Recent advancements in Catalytic Wet Air Oxidation with pillared clay catalysts for phenol remediation

Contact Info

Product

Resources

About