Extraordinary visible photocatalytic activity of a Co0.2Zn0.8O system studied in the Remazol BB oxidation

The Scientific World Journal

Arrahli

et al. 2020

Self Cite

The objective of this study is to evaluate the efficiency of methylene blue removal using Oued Sebou sediments as an adsorbent. The presence of carboxyl functional group demonstrated by infrared (IR) analysis of the sediment favorized the methylene blue (MB) adsorption. Sediment collected from Oued Sebou could remove the most MB molecules at pH 8. The Freundlich model described suitably the adsorption process. The experimental measured enthalpy (ΔH) and entropy (ΔS°) are 118.1 kJ mol−1 and 395.2 J mol−1 K−1, respectively, indicating that the reaction was endothermic with an increase of randomness at the solid/liquid interface during the adsorption. The kinetics of MB adsorption by sediment were adequately fitted to the pseudo-second-order model. Experimental results showed that the adsorption capacity of the methylene blue dye depends on the solution pH, the initial dye concentration, the adsorbent mass, the sediment particle diameter, and the temperature of the reaction medium. The removal efficiency of the MB molecules reaches 100% after 60 minutes under the optimum conditions.

Section: Introductionmentioning

confidence: 99%

Valorization of Oued Sebou Natural Sediments (Fez-Morocco Area) as Adsorbent of Methylene Blue Dye: Kinetic and Thermodynamic Study

Dra

The Scientific World Journal

Arrahli

et al. 2020

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“…The TOC values after 2 h of CWPO reaction were calculated using Eq. (2) [4]. Both, TOC measurements and analytical determinations of CAF concentrations were performed at least twice in order to ensure reproducibility of the measurements.…”

Section: Experimental Conditions For Catalytic Runsmentioning

confidence: 99%

“…These polluting agents are also in very high concentrations, so that releasing these molecules into the water resources, affects aquatic life and ecosystems beings, adversely [3]. In these cases, it is necessary to use less conventional techniques to remove the pollutants and convert persistent chemicals into environmentally benign compounds, such as advanced oxidation processes (AOPs) like Fenton process, electro catalytic oxidation, photocatalytic oxidation and catalytic wet peroxide oxidation [4,5,6,7,8]. The oxidation process with H 2 O 2 using a heterogeneous catalyst is commonly known as catalytic wet peroxide oxidation (CWPO).…”

Section: Introductionmentioning

confidence: 99%

Copper nickel co-impregnation of Moroccan yellow clay as promising catalysts for the catalytic wet peroxide oxidation of caffeine

Assila

Zouheir

et al. 2021

Heliyon

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Copper and nickel were incorporated into the prepared yellow clay (YC) using one of the most widely used methods, for the preparation of heterogeneous catalysts, which is the wet impregnation method (IPM) and its application as a heterogeneous catalyst for Caffeine (CAF). Several catalysts Cooper Nickel's Catalysts (Cu-Ni) were applied to the yellow clay with different weight ratio of Cu and Ni, in order to explore the role of both metals during the catalytic oxidation process CWPO. Furthermore, the CuNi-YC catalysts, were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), Langmuir's surface area, Brunauer Emmett Teller (BET), scanning electron microscope (SEM) and inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES), so as to get a better understanding concerning the catalytic activity's behavior of CuNi-YC catalysts. The optimization of the catalytic activity's effects on the different weight ratios of Cu and Ni, temperature and H 2 O 2 were also examined, using Box-Behnken Response Surface Methodology RSM to enhance the CAF conversion. The analysis of variances (ANOVA) demonstrates that Box-Behnken model was valid and the CAF conversion reached 86.16%, when H 2 O 2 dosage was equal to 0.15 mol.L À1 , copper impregnated (10%) and temperature value attained 60 C. In addition, the regeneration of catalyst's cycles under the optimum conditions, indicated the higher stability up to four cycles without a considerable reduction in its conversion performance.

“…Consequently, the textile and dyeing industry has begun seeking efficient methods for the removal of dyes. Meanwhile, there are various treatment processes that have been investigated and employed extensively for dyes elimination from wastewater [8,9], including coagulation and flocculation [10], biological treatment using anaerobic granular [11], catalytic wet oxidation photochemical treatment [12][13][14], Fenton's process, and adsorption technology. However, many of these technologies are expensive and complex when used to treat these dyes.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Studies on the Removal of Textile Effluent over Two Natural Eco-Friendly Adsorbents

Assila

Zouheir

et al. 2020

Journal of Chemistry

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This study investigates the possibility of applying an adsorption process using two abundant natural minerals M1 and M2. Without pretreatment or activation, the adsorbents were used to treat real textile wastewater samples (collected from Fez city, Morocco). As a cost-effective alternative, these materials were characterized by different analyses, including X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray fluorescence (XRF). Chemical oxygen demand (COD) and biological oxygen demand (BOD) were used to characterize the textile wastewater. Additionally, the influence of operating conditions (contact time, adsorbent dosages, and pH) was evaluated. Results show that the adsorption process takes place quickly, reaching the equilibrium at 90 and 160 min for M1 (88% COD) and M2 (79% COD). Both materials show a higher affinity to Cr (39%) and lower affinity to Cu (28%). A pseudo-second-order kinetic model provides the best fit to the experimental adsorption data. Germination tests indicate a low toxicity after the adsorption process. Performance of both materials was compared with that of other literature studies.