Browsing by Author "Bououdina, Mohamed"

Now showing 1 - 5 of 5

Effect of Thickness on Photocatalytic Activity of TiO2 Thin Films
(Springer link, 2015) Bensouici, F.; Bououdina, Mohamed; Iratni, A.; Tala-Ighil, Razika
Effects of Thickness and Preheated Temperature on Grains Orientation of 2D-ZnO Nanostructure and their Photocatalytic Activity
(Springer, 2021) Toubane, Mahdia; Azizi, Assia; Houanoh, D.; Tala-Ighil, R.; Bensouici, F.; Chebout, K.; lamrani, S.; Bououdina, Mohamed
The effects of pre-heating temperature and thickness of layers on (002) preferred orientation of ZnO thin films and their photocatalytic activity are reported. All films crystallize into a Zincite-type structure. With increasing pre-heating temperature, the evolution from (002) to (101) diffraction peaks indicates change in growth mode of ZnO films. Pre-heating at 100°C is the most favourable for highly oriented ZnO thin ﬁlms along (002) plane whereas all films deposited with different number of layers are oriented along (101) plane. The crystallite size is found to be in the range 20 - 32 nm. The observed average optical transmittance for these films is higher than 90% in the visible range. The energy band gap decreases with increasing number of layers but increases with increasing pre-heating temperatures. Wettability tests of ZnO thin films surface show a hydrophobic aspect for all films. The film pre-heated at 400°C with 223nm of thickness exhibits the highest degradation of methyl blue dye of 94% with high levels of photostability over five cycle
Efficient photodegradation of azucryl red by copper-doped TiO2 nanoparticles-experimental and modeling studies
(Springer, 2021) Kerrami, Ahmed; Khezami, Lotfi; Bououdina, Mohamed; Mahtout, Laila; Modwi, Abueliz; Rabhi, Souhila; Bensouici, Faycal; Belkacemi, Hayet
This research aims to investigate the effect of copper doping on the photocatalysis performance of TiO2nanoparticles for disposalwastewater from organic pollutants. X-ray diffraction analysis manifests the crystallization of a rutile phase for pure and copper-doped TiO2except for 2% resulting in a rutile-to-anatase phase transformation. The crystallite size is found less affected by Cudoping, i.e., ~30 nm. BET analysis indicates a decrease in the specific surface area as the doping loading increases. Scanningelectron microscopy observations reveal spherical particles at the nanometer range for pure TiO2and then larger agglomerates ofultrafine particles with Cu doping. FTIR analysis notifies the existence of hydroxyl groups, which will promote the photocatalysisprocess. The photodegradation of azucryl red (AR) has been investigated under different conditions; i.e., Cu-loading, initialconcentration of AR, and pH. The kinetics of the photodegradation process is further found to comply with the Lagergren kineticlaw, regardless the experimental conditions. Nevertheless, the photodegradation process is not only controlled by the intra-particle diffusion mechanism, but also by mass transfer through a liquid film boundary. The maximum degradation of AR,i.e., 86%, has been achieved at pH = 5.0 during 60 min of contact time for the 2% Cu doping, with effective regeneration. TheFreundlich model exhibits a better fitting for AR dye photodegradation equilibrium data, compared to Langmuir, Temkin, andDubinin-Radushkevich
Exceptional photocatalytic performance of hexagonal ZnO nanorods for anionic and cationic dyes degradation
(Elsevier B.V., 2025) Chabira, Fares; Toubane, Mahdia; Tala-Ighil, Razika; Humayun, Muhammad; Ouyang, Chun; Alanazi, Amal Faleh; Bououdina, Mohamed; Kyzas, George Z.
This study presents an in-depth investigation of zinc oxide hexagonal nanorods (ZnO NRs) synthesized via a hydrothermal approach at three pH basic values conducted in high-pressure laboratory reactor provided by Parr Instrument Company. The research evaluates the catalytic properties of the ZnO NRs, highlighting their potential for environmental applications. The as-fabricated samples are characterized by various techniques including the X-ray diffraction (XRD), UV–visible spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET) analysis, Field emission-scanning electron microscopy (FE-SEM), energy dispersive X-ray analysis (EDAX) and high-resolution transmission electron microscopy (HR-TEM). Rietveld refinement of X-ray diffraction data reveals the formation of high-purity hexagonal Wurtzite-type ZnO phase. Further, it is investigated that by decreasing the pH values, the grain size of ZnO NRs increases from 25.70 nm to 29.91 nm. SEM analyses further confirmed the hexagonal nanorod-shaped morphology of ZnO. The photocatalytic degradation performance of the as-fabricated ZnO NRs for Methylene Blue (MB) and Methyl Orange (MO) dyes increased with the increase in pH value, reaching almost 95 % and 64 %, respectively, after 30 min of UV irradiation. The optimum degradation is achieved at a pH value of 11.
The Synergistic Effect of Algerian Na-Bentonite/Potato Starch/Grass Powder on the Enhancement of Aged Water-based Drilling Fluids
(Springer, 2022) Sid, Asma Nour El Houda; Benalia, Kouin; hazourli, Abdelkrim; Djafar, Rabah; Gherraf, Noureddine; Bououdina, Mohamed
Nowadays, the use of eco-friendly additives in drilling fluids to improve rheological properties is widespread. This work aims to examine and assess the rheological characteristics and fluid loss of drilling fluid suspensions containing Algerian Na-Bentonite (NaB) and potato starch (PS) as viscosifier upon the addition of grass powder (GP). The obtained results indicate that the aging tests applied on different drilling fluid suspensions during 192 h at (20 °C) reduce the values of apparent viscosity by an average of (14.3%), plastic viscosity (22.2%), yield point (6.7%), and shear stress (47.3%) when varying the (PS) concentration in the suspensions (0.6, 1.2, 2%) as well as the values of fluid loss (9.5%); meanwhile, the values of initial and final gel strength are increased (32.6% and 19.6%, respectively). Subsequently, the possibility to further improve the rheological properties of drilling fluid suspensions using an environment eco-friendly additive (GP) has been studied. The introduction of (3, 6, 9 g) GP in the aged suspensions increases the values of rheological properties, i.e., the highest efficiency of 18.4% has been achieved by adding 9 g of GP to 2% (PS) aged suspension. The fluid loss test indicates that increasing the (GP) concentration in the (NaB+PS) suspension reduces the fluid loss volume by 36.42%. This study demonstrates the synergy of combining cost-effective GP to (NaB+PS) in aged drilling fluids by enhancing significantly its rheological properties besides a better environmental protection.