Browsing by Author "Asimeng, B."
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item Comparative synthesis of mesoporous MgO-MoO3 catalyst for potential industrial application(Hanyang University, 2016) Efavi, J.K.; Tiburu, E.; Yaya, A.; Damptey, L.A.; Bowen-Dodoo, E.; Asimeng, B.; Zhuang, J.The elevated interest in new materials as porous catalyst supports demands alternative strategies to improve yield of these systems through simple synthesis methodologies. In this work, different porous materials of MgO-MoO3/SBA-15 were synthesised at air, oven and microwave conditions to investigate and identify the best method for producing high surface area MgO-MoO3/SBA-15 catalyst. The results showed successful synthesis of mesoporous SBA-15 with homogenous dispersion of MgO-MoO3 nanocatalyst within the SBA-15 framework. The extent of crystallisation, the pore distribution and surface area was dependent on the crystallisation conditions adopted. The channels of the porous MgO-MoO3/SBA-15 network from the oven dry module were highly ordered, distinct and parallel. The oven drying crystallisation process module also yielded catalyst with surface area about ten folds higher than that of the air dry processes indicating that a given process module can be tailored for specific industrial application. The results also suggest that longer crystallisation time at temperatures in the range of 100 °C favours the formation of uniform pore structure with high surface area. © 2016, Hanyang University. All rights reserved.Item Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment(Hindawi, 2021) Annan, E.; Arkorful, G.K.; Konadu, D.S.; Asimeng, B.; Dodoo-Arhin, D.; Egblewogbe, M.Dyes used by the textile, tannery, and food industries tend to pollute water bodies and must be removed to get clean water. Hydroxyapatite (HAP) was synthesized from eggshells using the wet precipitation process. 'e as-synthesized HAP was characterized using Fourier Transform Infrared (FTIR) and X-ray powder diffraction (XRD). 'e synthesized HAP was mixed with three different clays: halloysite (HNT), kaolinite (KAO), and bentonite (BENT). 'e removal efficiency values of methylene blue (MB) from the data showed that HAP-BENT adsorbents had higher values, followed by HAP-HNT and then HAP-KAO adsorbents. 'e combined masses of 24 mg, 34.5 mg, and 33 mg (representing 20%, 15%, and 10% of HAP-BENT mass) had average adsorption capacity values of 20.7 mg/g, 17.2 mg/g, and 17.9 mg/g, respectively. For each mass percentage, the adsorption capacity values were found to decrease with adsorbent dosage. 'e HAP-BENT composites had removal efficiency values of 98.4, 91.9%, and 91.9%, respectively. Adsorption data for the HAP-BENT adsorbents were found to be well described by the Langmuir isotherm model and pseudo-second-order kinetic model. 'e effect of temperature on adsorption capacity was evaluated and thermodynamical modeling was undertaken. 'e thermodynamical modeling predicts that based on the value of the change in enthalpy and Gibbs free energy the process was exothermic and spontaneous. 'is work confirms the potential of HAP-clay composites in removing MB from water.