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3 2024

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Synthesis of Nano-Calcium Fluoride–Based Materials from Phosphogypsum Waste and their Use in Wastewater Treatment–Adsorption of Reactive Blue 21 Dyes

Bensemlali Meryem, Hatimi Badreddine, Mortadi Halima, Chajri Fatima-Zahra, Aarfane Abdellatif, Mohammed El Idrissi, Joudi Meryeme, Labjar Najoua, Nasrellah Hamid, Bakasse Mina

Journal of Ecological Engineering

2024

Vol. 25, nr 8

62--71

A novel synthesis process and characterization of nano-calcium fluoride (n-CaF2) single crystal prepared from phosphogypsum waste. The phosphogypsum (CaSO4 2H2O) powder has been mechanically mixed with NH4F in presence of a controlled amount of water. The mixture still sintered for 48 hours until the formation of nano calcium fluoride particles. The n-CaF2 particles have been characterized by several techniques, The techniques utilized included X-ray diffraction (XRD), infrared spectroscopy (IR), and scanning electron microscopy (SEM). Therefore, it was confirmed that very pure n-CaF2 was obtained with a Ca/F ratio of 0.5 and an average crystalizing size measured according to the Debye-Scherrer equation of 11 nm. Based on the findings reached, The characterization data revealed successful synthesis of n-CaF2 from phosphogypsum. Additionally, the adsorption performance of the elaborated n-CaF2 was tested in Reactive Blue 21 (RB21) anionic dye removal, Adsorption tests were conducted in a batch reactor, focusing on key factors such as contact time, which can significantly influence the adsorption results. adsorption amount, pH, and dye concentration were tested. Hence results show an important adsorption performance of n-CaF2 with Reactive Blue 21 removal rate up to 90%.

Study on Wastewater Treatment in the Textile Industry by Adsorption of Reactive Red 141 Dye Using a Phosphogypsum/ Vanadium Composite Developed from Phosphate Industry Waste

Chajri Fatima Zahra, Bensemlali Meryem, Hatimi Badreddine, Sanad Asmae, Joudi Meryeme, Abdellatif Aarfane, Siniti Mustapha, Bakasse Mina, Baraket Abdoullatif, Nasrellah Hamid

Ecological Engineering & Environmental Technology

2024

Vol. 25, iss. 7

46--62

A novel method has been explored based on the recovery of two industrial wastes V2 O5 and phosphogypsum from the fertilizer production industry, which also provide a significant challenge due to their toxicity and environmental impact. To solve the problem of these two harmful wastes, these residues have been transformed into valuable resources, by the elaboration of Nanoparticles vanadate-hydroxyapatite (NPs-HAP/VAP) adsorbent, contributing a sustainable solution without requiring expensive or highly skilled work. This comprehensive investigation explores the adsorption of the reactive red 141 dye (RR 141) on Ca10 (VO4 ) x (PO4 ) 6−x (OH) 2 , with (xi = 0, 1.5, 3, 4.5, and 6). Using a Centered composite design (CCD), several parameters influencing the adsorption process were examined. The optimal adsorption capacity is 50 mg. g – 1 under optimal conditions 57.5 mg of the adsorbent dose, 152.5 mgL-1 for the RR 141, pH 8, 92.5 minutes of contact time, and incorporation ratio of 4.5 with an R2 of 0.99. These results reinforce the effectiveness of our chosen CCD model. Kinetic analysis demonstrated a pseudoorder reaction model with an R2 ˃ 0.92, while the Sips isotherm describes the adsorption process. Thermodynamic studies revealed spontaneous adsorption, suggesting a physical character enhanced by a positive entropy variation.

Removal of Methylene Blue by Low-Cost Adsorbent Prepared from Jujube Stones – Kinetic and Thermodynamic Studies

Sanad Asmae, Bensemlali Meryem, Hatimi Badreddine, Chajri Fatima Zahra, Joudi Meryeme, Aarfane Abdellatif, Labjar Najoua, Bakasse Mina, Nasrellah Hamid

Ecological Engineering & Environmental Technology

2024

Vol. 25, iss. 6

148--158

Agricultural residue emerges as a cost-effective and readily available option for the adsorption of dyes, owing to its affordability and efficacy. The purpose of our study focuses on the methylene blue dye (MB) removal using chemically modified jujube stone (MJS) as an adsorbent. The MJS underwent characterization through multiple methodologies including scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The research systematically investigated contact time, PH, temperature, initial dye concentration, and adsorbent dosage impact to optimize the removal efficiency. Experimental findings demonstrated that the MJS adsorbent achieved a dye removal efficiency of approximately 94% under batch mode and room temperature conditions. Kinetic analysis revealed an equilibrium time of around 70 minutes. Remarkably, this study unveils the novel application of chemically customized jujube stone a highly effective adsorbent for removing methylene blue dye. Applying the pseudo-second-order model provides the most precise description for methylene blue (MB) adsorption onto MJS. The modeling of adsorption isotherms indicated conformity to the Langmuir model. The thermodynamic study shows a negative value of ΔG, which demonstrates spontaneous MB adsorption into MJS, while a positive value of ΔH implies an endothermic adsorption process.