Photocatalytic hydrogen evolution on the hetero-system polypyrrol/TiO 2  under visible light

Belabed, C.; Haine, N.; Benabdelghani, Z.; Bellal, B.; Trari, M.

doi:10.1016/j.ijhydene.2014.08.107

Cited by 22 publications

(6 citation statements)

References 22 publications

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“…In addition, the conductivity measurement was compared to the optical properties determined by the diffuse reflectance spectrum using a relation between the absorption coefficient (α) and the incident photon energy (hν), which are given by the Tauc [31] relation:…”

Section: Products Materials and Analysis Techniquesmentioning

confidence: 99%

Montmorillonite/Poly(Pyrrole) for Low-Cost Supercapacitor Electrode Hybrid Materials

Hamidouche,

Ghebache,

Lepretre

et al. 2024

Polymers

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Conductive polymers such as polypyrrole have been widely used as pseudo-capacitive electrodes for supercapacitors. This work demonstrates a simple method to improve the performance of conductive polymer electrodes by adding montmorillonite in order to perform capacitive behavior. Conductive composite polymers (CCPs) based on montmorillonite/polypyrrole (MMT/PPy(Cl)) have been synthesized by polymerization using FeCl3 as an oxidizing agent. During the preparation of CCP, the effect of MMT/pyrrole mass ratio and the influence of the amount of added H+ and temperature of the synthesis medium on the electrochemical performance of the composite have been investigated. The investigation associated with conductivity measurement allowed us to determine the best conditions to reach a high specific capacitance of 465 F gr−1 measured by cyclic voltammetry with respect to the CCP synthesized at ambient temperature (220 F gr−1) and a 35% increase in capacity compared to its homologue synthesized in neutral conditions at a low temperature. These performances have been advantageously correlated both to the edge acidity of the host material and to the evolution of its conductivity according to the preparation conditions. The galvanostatic charge/discharge tests also confirm the stability of the obtained composite, and a capacitance of 325 F g−1 for the best CCP is recorded with a regime of 1 A g−1. In addition, the durability of the device shows that the proposed material has a relatively good stability during cycling.

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Section: Products Materials and Analysis Techniquesmentioning

confidence: 99%

Montmorillonite/Poly(Pyrrole) for Low-Cost Supercapacitor Electrode Hybrid Materials

Hamidouche,

Ghebache,

Lepretre

et al. 2024

Polymers

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“…In this respect, the photocatalysis is an efficient advanced oxidation process (AOP) which offers different advantages such as n ability to apply under ambient temperature and pressure, use to treat emerging pollutants and to achieve their mineralization to the ubiquitous substances like H 2 O and CO 2 (Tab et al, 2020). In this respect, TiO 2 is extensively used (Belabed et al, 2014) in many applications, including paints (Fonseca et al, 2021), toothpastes (Liu et al, 2019), UV protection (Xu et al, 2020), photovoltaics, gas sensors as well as electro-and photochromism materials (Li et al, 2017). Moreover, TiO 2 is nontoxic, inexpensive, chemically stable over the entire pH range, and exhibits excellent performance for removing pollution from both water and air under UV light, which accounts for only 5% of the solar radiation (Carvalho et al, 2019;Güy and Özacar, 2016;Khan et al, 2020;Yanalak et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

High efficiency photocatalytic degradation of Ambroxol over Mn doped TiO2: Experimental designs, identification of transformation products, mineralization and mechanism

Tab

Dahmane

Belabed

et al. 2021

Science of The Total Environment

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Ambroxol (AMB) is a drug commonly used for chronic bronchitis prevention. Once released in surface water, this recalcitrant chemical becomes a hazardous pollutant.Here, we investigated the ability of 1% Mn-doped TiO 2 (Mn-TiO 2 ) to mineralize AMB by photocatalysis. We studied the morphology, and the physical and electrochemical properties of Mn-TiO 2 using X-ray diffraction, Scanning electron microscopy, Transmission electron microscopy, X-ray fluorescence, BET method, UV-visible, and electrochemical study and optimized the AMB degrading experimental conditions through response surface methodology (RSM). Mn-TiO 2 at the dose of 0.625 g.L -1 allowed the complete photodegradation of AMB (30 ppm) at pH 7 under UVA light irradiation for 30 min while total mineralization in CO 2 (> 96%) was achieved after 24 h of irradiation. Mn-TiO 2 was 1.6-time more efficient than TiO 2 Degussa P25. Product studies were also carried out by liquid 2 chromatography coupled to electrospray high resolution mass spectrometry. Twentyone photodegradation products were detected and identified. In addition, ionic chromatography analyses revealed the release of Br -, NH 4 + , and NO 3 at respectively 97, 63 and 35% of the total Br, and N initially present in AMB. Finally, the reusability of the photocatalyst was also tested. After four cycles, the almost complete photodegradation of AMB was achieved showing that Mn-TiO 2 was highly stable.This work brings new physical characteristics on Mn-TiO 2 photocatalyst. Moreover, it is the first study investigating the photocatalytic degradation of recalcitrant AMB drug.

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“…In this respect, the polymer conductors have attracted a great interest from both academic and technical point of view over the last decade [4][5][6]. Such materials not only work in a similar way to inorganic semi-conductors (SCs) but also have additional advantages like environmental friendliness, facile synthesis and light weight [7]. Moreover, organic materials show higher conductivity due to the itinerant electron on conjugated system compared to the inorganic SCs [8].…”

Section: Introductionmentioning

confidence: 99%

Optical and Dielectric Properties for the Determination of Gap States of the Polymer Conductor: Polypyrrol

Belabed¹,

A²,

Belhamedi³

et al. 2020

Int J Opt Photonic Eng

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The polypyrrole is a conducting polymer prepared by chemical route. The diffuse reflectance measured in the wavelength range (300-2500 nm) permitted to calculate the refractive index (n), extinction coefficient (k), dissipation factor (tan δ) and relaxation time (τ). The optical band gap (Eg) was evaluated from the dielectric and conductivity properties, its value (1.01 eV) was confirmed by using the Tauc relation.

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Photocatalytic hydrogen evolution on the hetero-system polypyrrol/TiO 2 under visible light

Cited by 22 publications

References 22 publications

Montmorillonite/Poly(Pyrrole) for Low-Cost Supercapacitor Electrode Hybrid Materials

Montmorillonite/Poly(Pyrrole) for Low-Cost Supercapacitor Electrode Hybrid Materials

High efficiency photocatalytic degradation of Ambroxol over Mn doped TiO2: Experimental designs, identification of transformation products, mineralization and mechanism

Optical and Dielectric Properties for the Determination of Gap States of the Polymer Conductor: Polypyrrol

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