Polyaniline coated hematite sand supported on graphene oxide (HS@PANI‐GO) as a new magnetic material for advanced catalytic oxidation based on sulfate radicals: optimization using response surface methodology

International audienc

Conjugated polymers templated carbonization to design N, S co-doped finely tunable carbon for enhanced synergistic catalysis

International audienceEfficient generation of 1O2 nonradical species from persulfate (PS) is demonstrated during heterogeneous catalysis systems based on the use of new Nitrogen and Sulfur doped carbons (NC, SC and NSC), as prepared by direct carbonization of polyaniline/polythiophene conjugated polymers at 800 °C. Complete organic molecules degradations were achieved with high mineralization rate (∼70%) for all systems, over a wide pH range (2.6∼9.5) in the presence of PS. Interestingly, the synergistic effect occurring between the N-Graphitic and the S-Thiophenic sites, modulates the surface electron density toward basic carbon structure (N∼4.76 at% and S∼3.87 at%, with SBET∼251 m2 g−1), leads to increases of the adsorption abilities and the reaction rate constant (from 0.076 to 0.338 min−1), and boosts the carbocatalyst' stability. Our discovery sheds new light on new systems promoting the Fenton-like oxidation process by 1O2 nonradical species, it may be a long-lasting sustainable environmentally strategy for water remediation

Recent trends on numerical investigations of response surface methodology for pollutants adsorption onto activated carbon materials: A review

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High extent mass recovery of alginate hydrogel beads network based on immobilized bio-sourced porous carbon@Fe3O4-NPs for organic pollutants uptake

International audienc

Physico-chemical characterization of clays from Assa-Zag for valorization in cationic dye methylene blue adsorption

International audienc

Synergistic effect for efficient catalytic persulfate activation in conducting polymers-hematite sand composites: Enhancement of chemical stability

International audienceThis study explores new chemical strategies for coating the hematite sand (HS) by conductive polymers to enhance the persulfate activation performance. The highest catalytic activity was due to synergistic effect between the HS and the conductive polymers. In fact, conjugated polymers could act as an activator and electronic mediator to promote the conversion of Fe (III) to Fe (II). Hence, both conductive polymers used (polyaniline and polypyrrole) have been found to provide the necessary electron transfer, thanks to their nitrogen atoms located in their conjugated chains. The radical scavenging experiments assessed by electronic paramagnetic resonance indicated that the studied pathways nature was both a radical and non-radical type. Further, it was found that the protective polymer layers prevented metal ion leaching, mitigate catalyst deactivation, enabled pH insensitive persulfate activation, and increased the chemical stability. This work provides a new innovative way to remove multiple pollutants in wastewate

Combined Methane Energy Recovery and Toxic Dye Removal by Porous Carbon Derived from Anaerobically Modified Digestate

International audienc

Engineering of new hydrogel beads based conducting polymers: Metal-free catalysis for highly organic pollutants degradation

International audienceEngineering of new heterogeneous metal-free catalysts is of great importance for persulfate activation. Herein, Innovative conductive polymers Polyaniline (PANI) and Polypyrrole (PPy) were used as promising catalysts for PS activation to effectively degrade organic pollutants. In fact, PANI and PPy can provide the necessary electron transfer based on nitrogen atoms located in the conjugated chains compared to their counterparts in the defective sites. In addition, PANI and PPy were immobilized inside membrane formed by cross linking alginate biopolymer by divalent calcium ions, in order to develop a new stable hydrogel beads catalyst. The prepared hydrogels-activated PS process could maintain excellent catalytic properties, mitigate catalysts deactivation, increased chemical stability and offer hope for their application in the industrial scale. The radical scavenging experiments monitored by the electron paramagnetic resonance and functional theory calculations, indicated the role of the PANI and PPy conjugated chains and the nature of the reaction pathways

Synthesis and characterization of mesoporous geopolymer based on Moroccan kaolinite rich clay

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