Performance of surfactant-modified *BEA-type zeolite nanosponges for the removal of nitrate in contaminated water: Effect of the external surface

Hanache, Layla El; Lebeau, Bénédicte; Nouali, Habiba; Toufaily, Joumana; Hamieh, Tayssir; Daou, T. Jean

doi:10.1016/j.jhazmat.2018.10.015

Cited by 54 publications

(30 citation statements)

References 42 publications

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“…Nevertheless, a drastically rising adsorption isotherm at P/P 0 of 0.9-1.0 was solely observed in nano-crystals of AIST-1 indicating the presence of abundant slits caused by the stacked nano-crystals. [22] As expected, similar pyrolysis toward the obtained nano-crystals resulted in the uniform formation of graphitized nitrogen-doped carbon layer (GNCL), as observed by TEM images (Figures 1 h and S5-S7). Besides the graphitic peaks in the PXRD patterns of GNCL, the absence of additional peaks confirms an in situ removal of the most of Zn metal (boiling point of 907 8C) at 1000 8C from the carbon matrix ( Figures S2c and S8).…”

Section: Preparation and Structural Characterization Of Gnclsupporting

confidence: 79%

Fabricating Dual‐Atom Iron Catalysts for Efficient Oxygen Evolution Reaction: A Heteroatom Modulator Approach

et al. 2020

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Understanding the thermal aggregation behavior of metal atoms is important for the synthesis of supported metal clusters. Here, derived from a metal–organic framework encapsulating a trinuclear FeIII2FeII complex (denoted as Fe3) within the channels, a well‐defined nitrogen‐doped carbon layer is fabricated as an ideal support for stabilizing the generated iron nanoclusters. Atomic replacement of FeII by other metal(II) ions (e.g., ZnII/CoII) via synthesizing isostructural trinuclear‐complex precursors (Fe2Zn/Fe2Co), namely the “heteroatom modulator approach”, is inhibiting the aggregation of Fe atoms toward nanoclusters with formation of a stable iron dimer in an optimal metal–nitrogen moiety, clearly identified by direct transmission electron microscopy and X‐ray absorption fine structure analysis. The supported iron dimer, serving as cooperative metal–metal site, acts as efficient oxygen evolution catalyst. Our findings offer an atomic insight to guide the future design of ultrasmall metal clusters bearing outstanding catalytic capabilities.

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Section: Preparation and Structural Characterization Of Gnclsupporting

confidence: 79%

Fabricating Dual‐Atom Iron Catalysts for Efficient Oxygen Evolution Reaction: A Heteroatom Modulator Approach

et al. 2020

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“…The process not only can change the mesopore materials but also can increase the catalytic activity (improving the accessibility and mass transfer on the surface) [88]. Hierarchical zeolites with different topologies, such as ZSM-5 (MFI) [67,89,90], beta (BEA) [81,91,92], and Y (FAU) [64], have also been used in the acetalization of glycerol, and the results show that smaller pores can produce high glycerol conversion and selectivity to selectivity (almost 100% selective for solketal formation). However, overall, all materials displayed very good catalytic performance when reacting equimolar mixtures of glycerol and acetone [37,39].…”

Section: Perspective On Ketalization Of Glycerol Over Hierarchical Zementioning

confidence: 99%

Glycerol to Solketal for Fuel Additive: Recent Progress in Heterogeneous Catalysts

et al. 2019

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Biodiesel has been successfully commercialized in numerous countries. Glycerol, as a byproduct in biodiesel production plant, has been explored recently for fuel additive production. One of the most prospective fuel additives is solketal, which is produced from glycerol and acetone via an acetalization reaction. This manuscript reviewed recent progress on heterogeneous catalysts used in the exploratory stage of glycerol conversion to solketal. The effects of acidity strength, hydrophobicity, confinement effect, and others are discussed to find the most critical parameters to design better catalysts for solketal production. Among the heterogeneous catalysts, resins, hierarchical zeolites, mesoporous silica materials, and clays have been explored as effective catalysts for acetalization of glycerol. Challenges with each popular catalytic material are elaborated. Future works on glycerol to solketal will be improved by considering the stability of the catalysts in the presence of water as a byproduct. The presence of water and salt in the feed is certainly destructive to the activity and the stability of the catalysts.

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“…[376] To finish, several works are given that aimed to synthesize hierarchical *BEA nanosponges. [378][379][380][381] Therefore, Kim et al [378] and Shin et al [379] employed gemini-surfactants in the hydrothermal synthesis of these structures. Nanosponge zeolites can be seen as randomly interconnected ultrathin beta nanocrystals with intercrystalline mesopores.…”

Section: Betamentioning

confidence: 99%

“…To finish, several works are given that aimed to synthesize hierarchical *BEA nanosponges. [ 378–381 ] Therefore, Kim et al. [ 378 ] and Shin et al.…”

Section: Synthesis Of Hierarchical 12‐mr Zeolitesmentioning

confidence: 99%

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

et al. 2020

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Zeolites are highly crystalline aluminosilicates with welldefined pores that are constructed of SiO 2 and AlO 4 tetrahedra. These tetrahedra can be linked together in different unique ways to form various materials with a specific topology. [1] According to the International Zeolite Association (IZA), more than 250 different topologies, which are all assigned with a three-letter code, have been identified. [2] The micropores in zeolites are typically constructed from 8, 10, or 12 tetrahedral atoms

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Performance of surfactant-modified *BEA-type zeolite nanosponges for the removal of nitrate in contaminated water: Effect of the external surface

Cited by 54 publications

References 42 publications

Fabricating Dual‐Atom Iron Catalysts for Efficient Oxygen Evolution Reaction: A Heteroatom Modulator Approach

Fabricating Dual‐Atom Iron Catalysts for Efficient Oxygen Evolution Reaction: A Heteroatom Modulator Approach

Glycerol to Solketal for Fuel Additive: Recent Progress in Heterogeneous Catalysts

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

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