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Ewenifa O. J
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Synthesis and Characterisation of Calcined Zeolite X and Silica-Supported Zeolite Y Abakpa A. M; Leke L; Twan S. M; Japhet T; Ewenifa O. J; Omale, O. P
African Journal of Sciences and Traditional Medicine Vol 1 No 1 (2024): African Journal of Sciences and Traditional Medicine
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstm.v1i1.3493

Abstract

Zeolite X was synthesised from rice husk silica and aluminium metal as raw materials while Zeolite Y supported catalyst was synthesised from sodium hydroxide, sodium silicate and alumina as chemical raw materials and was impregnated with rice husk silica by wet impregnation method, the catalyst were subsequently calcined at 550 0C for 6h the catalysts were characterised using XRD, FTIR and SEM. The formation of AlO4/SiO4 catalyst was confirmed by the analysis aforementioned. The XRD revealed that Zeolite X and Y synthesized has a faujasite phase with major peaks 230, 22.50 and 17.50, 180 in zeolite X and Y respectively, SEM confirmed the composition of crystallite shapes of irregular, cubic and rectangular shape. FTIR analyses revealed the presence of functional groups (The signal at the silica-alumina vibrational regions (1300 – 300 cm-1) indicates that SiO4 or AlO4 are linked) associated with Zeolites.
Designing a Novel Hybrid Material: Hydroxyl Iron (III) – Bentonite, Kaolinte Composites for Enhanced Phenol Removal from Wastewater: A Comparative Study Egah G. O; Sha’Ato R; Ewenifa O. J; Itodo A. U
African Journal of Sciences and Traditional Medicine Vol 1 No 1 (2024): African Journal of Sciences and Traditional Medicine
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstm.v1i1.3500

Abstract

sources. This study examines Hydroxyiron (III) bentonite (HBC) and kaolin (HKC) composites for phenol removal from aqueous solutions (5–25 mg/L). The composites, produced by mixing bentonite and kaolin with Hydroxyiron (III) in a 3:1 ratio and calcined at 600°C for 1 hour, were tested at pH 2-11 and 25°C, with adsorbent dosages from 0.5 to 2.5 g in 50 mL solutions. Adsorption thermodynamics were developed for 1 hour, and kinetics experiments were performed at 25°C with a range of 10-60 minutes. Adsorption capacity increased with time, temperature, and concentration. HBC and HKC had pH values of 7.20 and 7.37, pHzpc of 10.10 and 11.00, conductivities of 1.657 and 1.763 μS/cm, bulky densities of 1.214 and 1.185 g/cm³, and attrition rates of 27.21% and 27.91%, respectively. XRF, FTIR, and SEM analyses confirmed hydroxyl group presence, indicating hydrogen bonding with phenol. The Blanchard pseudo-second order model best described HBC (R² = 0.906), and the pseudo-first order model best described HKC (R² = 0.957). Data fit the Langmuir model, indicating monolayer adsorption. Positive enthalpy, entropy, and Gibbs free energy values showed endothermic and non-spontaneous adsorption, with physisorption dominating chemisorption. Maximum adsorption efficiencies were 79.952% for HBC and 75.600% for HKC at 60 minutes, suggesting HBC is a more effective adsorbent. These results indicate that HBC and HKC can be used to remove organic pollutants from wastewater.
Exploring the Degradation of Malachite Green Using Fenton and Photo-Fenton Processes Egah G. O; Obadimu C. O; Ewenifa O. J; Ndukwe B. K; Adelagun R.O. A
African Journal of Sciences and Traditional Medicine Vol 1 No 1 (2024): African Journal of Sciences and Traditional Medicine
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstm.v1i1.3501

Abstract

The degradation of Malachite green (MG) dye was studied using Fenton and Photo-Fenton processes. Batch experiment was conducted for the effect of pH at the range of (3–12), initial concentration at 50–250mg/L, effect of catalyst dosage of 0.2-1.0g, contact time (10–60min) and temperature (303–318) were eval_uated. For each experiment, the reactor was loaded with 30mL of 50mg/L of MG aqueous solution and 20ml of 50mmol of hydrogen peroxide to which 0.5g of the ferrous catalyst was added. As investigated, the degradation capacity of Fenton and Photo Fenton was favoured by an increase in dosage, concentration, and contact time. While degradation decreases with increase in temperature and pH. The optimum pH for the degradation of MG was found to be 3. The experimental data of MG fitted better into Freundlich equation indicating multilayer degradation. Also the Kinetic data fitted more into pseudo second order than in pseudo first order equation for both Fenton and photo Fenton suggesting chemisorptions as the rate limiting step. The negative value of enthalpy change (∆H), entropy change (∆S) and Gibbs free energy (∆G) indicating that the degradation of Malachite Green was exothermic and spontaneous, meaning that physisorption dominate chemisorptions. Overall, Fenton and Photo Fenton as investigated in the present study; it is an evident that Photo-Fenton has higher potency for degradation of Malachite green than that of Fenton.
Co-Authors Abakpa A. M Adelagun R.O. A Egah G. O Itodo A. U Japhet T Leke L Ndukwe B. K Obadimu C. O Omale, O. P Sha’ato R Twan S. M