Browsing by Author "Abubakar Ladio Hassana"

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A review on the applications of zinc tungstate (ZnWO4) photocatalyst for wastewater treatment
(Elsevier Ltd., 2022-02-02) Abubakar Ladio Hassana; Jimoh Oladejo Tijani; Saka Ambali Abdulkareem; Abdullahi Mann; Saheed Mustapha
The monoclinic wolframite-phase structure of ZnWO4 materials has been frequently synthesised, characterised, and applied in optical fibres, environmental decontamination, electrochemistry, photonics, catalysis, and not limited to magnetic applications. However, the problems of crystal growth conditions and mechanisms, growth, the crystal quality, stability, and the role of synthesis parameters of ZnWO4 nanoparticles remain a challenge limiting its commercial applications. This review presents recent advances of ZnWO4 as an advanced multi functional material for Industrial wastewater treatment. The review also examines the influence of the synthe sis parameters on the properties of ZnWO4 and provides insight into new perspectives on ZnWO4-based photo catalyst. Many researches have shown significant improvement in the efficiency of ZnWO4 by mixing with polymers and doping with metals, nonmetals, and other nanoparticles. The review also provides information on the mechanism of doping ZnWO4 with metals, non-metals, metalloids, metals oxides, and polymers based on different synthesis methods for bandgap reduction and extension of its photocatalytic activity to the visible region. The doped ZnWO4 photocatalyst was a more effective and environmentally friendly material for removing organic and inorganic contaminants in industrial wastewater than ordinary ZnWO4 nanocrystalline under suitable growth conditions.
Charge Carrier Dynamics and Bandgap Modulation in Doped ZnWO4 Nanocomposites
(Bima Journal of Science and Technology, 2024-02-02) Abubakar Ladio Hassana; Abubakar A.A; Nasir Z. J
This study investigates the effects of doping on the bandgap energy of synthesized and doped ZnWO4 nanomaterials. The synthesized nanomaterials were doped with varying concentrations (1%, 3%, 5% & 7%) of the nonmetals nitrogen, carbon and boron. The optical, morphological and textural nature of the prepared nanomaterials were characterized by different analytical tools. The UV-Visible/HRTEM/XRD analysis confirmed that the incorporation of the dopants which had an impact on the band gap energy but did not significantly alter the host material's phase or produce defects, the orientation and growth pattern of the doped ZnWO4 along [021] plane was observed. There was an observed decrease in the bandgap energy upon doping from 4.68 eV to 2.31 eV, 2.0 eV and 2.30 eV for 7%N-ZnWO4, 7%C-ZnWO4 and 7%B-ZnWO4. There was also an increase in the relative crystallinity of the nanocomposite materials. The XRD results obtained showed a decrease in crystallite size of most of the nanomaterials with the lowest for each dopant being 8.11 nm, 7.64 nm, 7.25 nm for 1%N, 3%C and 3%B respectively, the XRD results also corroborated with the HRTEM results obtained. The results from the characterization revealed that doping was successful at improving the efficiency of the synthesized ZnWO4 nanoparticles.
Photocatalytic Degradation and Defluorination of Per- and Poly-Fluoroalkyl Substances (PFASs) Using Biosynthesized TiO2 Nanoparticles under UV–Visible Light
(MDPI, 2023-02-02) Mustapha Saheed; Tijani Jimoh Oladejo; Elabor Rabi; Etsuyankpa Muhammed Binin; Amigun Azeezah Taiwo; Shuaib Damola Taye; Sumaila Abdulmumuni; Olaoye Adekunle Jelili; Abubakar Ladio Hassana; Abdulkareem Saka Abdulkareem; Ndamitso Muhammed Muhammed
Per- and poly-fluoroalkyl substances (PFASs) are recalcitrant chemicals with stable carbon f environment, causing potential health effects on humans. luorine (C–F) bonds. These complex substances are difficult to degrade; therefore, they persist in the This study focused on the photocatalyticdegradation and defluorination of perfluorooctane sulfonate (PFOS) in aqueous water using TiO2 nanoparticles under UV–visible light. The biosynthesized TiO2 catalysts at pH 8, 10, and 12 were characterized using XRD, HRTEM, and HRSEM. The XRD patterns of the respective TiO2 nanopar ticles at different synthesized pHs exhibited similar anatase phases, and it was observed that the crystallite sizes decreased with increasing pH. The HRSEM and HRTEM confirmed the spherical shapes of the produced nanoparticles with particle size distributions of 12.17 nm, 10.65 nm, and 8.81 nm for the synthesized TiO2 nanoparticles at pH 8, 10, and 12, respectively. The photodegra dation and defluorination of PFOS were performed at various initial solution pH values of 2, 4, 6, 8, 10, and 12 under UV irradiation for 150 min. The study showed 95.62 and 56.13% degradation and defluorination efficiency at pH 2. The degradation and defluorination efficiencies significantly decreased as the pH of the solution increased; hence, the degradation increases at lower solution pHs. Without UV–visible light, the photocatalysis achieved a lower degradation and defluorination efficiency. The photocatalysis showed that the pH of the solution and UV irradiation greatly influence the degradation and defluorination. Therefore, TiO2 nanoparticles were effective for the degradation and defluorination of PFOS under UV–visible light, which could also have an influence on the treatment of other PFASs in wastewater.
Synthesis, characterization and application of zeolite-A/graphene oxide nanocomposite for ammonia removal from poultry manure: Box-Behnken design optimization
(Elsevier Ltd, 2026-02-02) Jimoh Oladejo Tijani; Muhammad Sani; Saheed Mustapha; Sarah Udenyi Onogwu; Abubakar Ladio Hassana; Ambali Saka Abdulkareem; Oluwatosin Kudirat Shittu; Abdulsalami Sani Kovo; Titus Chinedu Egbosiuba; Alechine Emmanuel Ameh; Muhammed Muhammed Ndamitso; Ogunmuyiwa O. Enoch; Omar H. Abd-Elkader; Hamad A. Al-Lohedan; Abdelrahman O. Ezzat
This study developed zeolite-A/graphene oxide (GO) nanocomposite for ammonia removal from poultry manure. Zeolite-A, GO, and the zeolite-A/GO composite were synthesized and characterized using various analytical tools. Physicochemical properties of soil and poultry manure were analyzed, and ammonia reduction was assessed using column adsorption with the nanomaterials. HRSEM images showed zeolite-A as uniform cubic shapes, GO with a layered structure, and the zeolite-A/GO composite as stacked cubic-spherical particles. HRTEM images indicated strong interactions with smaller zeolite-A particles within GO sheets. FTIR analysis showed characteristic peaks for both zeolite-A and GO, indicating retention of both materials’ features. N2 adsorption-desorption analysis revealed surface areas of 15.89 m²/g for zeolite-A, 19.35 m²/g for GO, and 69.30 m²/g for the composite. The response surface methodology (RSM) results indicated that zeolite-A/graphene oxide nanocomposites significantly removed 95% ammonia, with adsorbent dosage being the most influential factor, followed by stirring time, while pH had a non-significant effect. The removal efficiencies of ammonia using the adsorbents were temperature-dependent under the influence of optimum parameters from the RSM results.