Schemas, presentation and retention of information: Three studies in the MOOC context

Chaker, Rawad

doi:10.4000/dms.3326

Cited by 1 publication

(3 citation statements)

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“…6). The decrease in the number of electrons in Pani leads to (e − /h + ) pair recombination and provides the enhancement of the photocatalytic activity of the catalysts [27,29]. It was observed that the degradation in the first 30 min was very fast during and after this, it began to slow down.…”

Section: Kinetic Studiesmentioning

confidence: 99%

“…The principal mechanism of AOPs function is the generation of highly reactive free radicals such as hydroxyl radical (OH • ), superoxide radicals (O 2 −• ) [25,26]. Among many AOPs, photocatalysis can be very easily carried out under ambient conditions and leads to the total mineralization of organic carbon to CO 2 and H 2 O [27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

“…Based on the knowledge acquired from our previous work where several experimental parameters were tested [27,28,48], we focused on these values. Our main goal in this study is rather to test a new catalyst (composite based conductive polymer).…”

Section: Introductionmentioning

confidence: 99%

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Heterogeneous photocatalytic degradation of anionic dye on polyaniline/microcrystalline cellulose composite

et al. 2022

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The development of novel polymeric composites, especially those based on conductive polymers has attracted a consider-able attention due to their applications in a wide range of fields. This study focuses on one of these biocomposites based on polyaniline Pani and a biopolymer (microcrystalline cellulose MCC), synthesized by in-situ polymerization of aniline using ammonium persulfate (APS) as oxidant at room temperature. Firstly, different amounts of MCC were dispersed in HCl solu-tion with aniline monomer under stirring. Then a mixture of APS/HCl solution was introduced into the first aniline-MCC-HCl mixture. The obtained materials as well as Pani and MCC were characterized using powder X-ray diffraction (XRD), Argon adsorption-desorption (BET/DFT), thermal analysis, fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Thus, a correlation between interesting structural/textural/morphological data of these materials will be established. The results confirm the formation of Polyaniline-MCC composite under well determined conditions which has a more compact homogeneous morphology and a higher thermal stability than those of Pani and MCC. Furthermore, these materials are used for the catalytic degradation of toxic anionic dye namely Methyl Orange (MO) from aqueous media under UV light irradiation. The optimum values were 0.1 g L − 1 of photocatalyst, 30 ppm of MO solution, and pH solution of 5.6, which allowed reaching 97% within 70 min with high stability after four continuous runs. The photodegradation kinetics of MO onto composite followed the pseudo-first order model.

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Section: Kinetic Studiesmentioning

confidence: 99%