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Browsing by Author "Mu'azu, Nuhu Dalhat"

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    Comparative adsorption of tetracycline onto unmodified and NaOH-modified silicomanganese fumes: Kinetic and process modeling
    (2023) Manzar, Mohammad Saood; Ahmad, Tauqir; Zubair, Mukarram; Ullah, Nisar; Alqahtani, Hissah A.; Jwaher M. AlGhamdi; Georgin, Jordana; Nasir, Muhammad; Mu'azu, Nuhu Dalhat; Al Ghamdi, Jwaher M.; Aziz, Hamidi Abdul; Meili, Lucas
    Silicomanganese fumes (SMF) are industrial waste and a potential low-cost adsorbent for the removal of contaminants from water. In this study, the adsorption performance of SMF and NaOH-modified SMF (SMF-Na) for the removal of tetracycline (TC) from an aqueous solution was investigated. The characterization results showed the presence of functional groups (SiO2, -OH and C-O-C), a considerably higher surface area of the SMF-Na (142.59 m2 g−1) compared to the SMF (7.73 m2 g−1). The TC adsorption was favored under acidic conditions (pH 2–3) and increased with an increasing amount of adsorbent. The adsorption equilibrium was achieved in 360 min, and the presence of Na+ ions insignificantly influenced the TC adsorption. The Avrami model fitted better to the kinetic data with R2 = 0.995. The isothermal data was well represented by the Redlich-Peterson and Langmuir model. The maximum monolayer adsorption capacity of SMF and SMF-Na was 117 and 129 mg g−1, respectively. The thermodynamic results confirmed that the TC adsorption was endothermic and predominantly governed by physical forces. The removal of TC onto SMF and SMF-Na was maintained above 90 % even after five regeneration cycles The results suggested that SMF-Na is a promising alternative adsorbent for the removal of tetracycline antibiotics from wastewater streams.
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    Inhibition of low carbon steel corrosion by a cationic gemini surfactant in 10wt.% H2SO4 and 15wt.% HCl under static condition and hydrodynamic flow
    (2023) Mu'azu, Nuhu Dalhat; Haladu, Shamsuddeen A.; Nouf Essa aldossary; Alqahtani, Hissah A.; Mukarram Zubair; Mohammad Saood Manzar; Odewunmi, Nurudeen A.; Aldossary, Nouf Essa; Saud alareefi, Haya; Alshaer, Zainab Hussain; Ali, Shaikh A.; El-Lateef, Hany M. Abd
    The corrosion inhibition potentials of a cationic gemini surfactant (CGS) on low carbon (LC) steel in highly corrosive environment of 10 wt.% H2SO4 and 15 wt.% HCl (which imitates oil well acidic environment) at elevated temperatures was studied using potentiodynamic polarization (PDP), gravimetric, and surface (XPS, SEM and EDX) analyses. Unprecedented inhibition efficiencies (IE) of 92.2% and 92.5% were repeatedly obtained at CGS concentrations of as low as 0.25 ppm and 1 ppm in 15 wt.% HCl and 10 wt.% H2SO4 at 25 °C by gravimetry, respectively. Higher inhibition efficiencies were obtained at elevated CGS concentrations. The inhibitor act as a mixed type based on the PDP data. The adsorption of CGS on the steel surface further supports a stronger tendency for he CGS adsorption onto the steel surface, thereby establishing an effective protective mechanism of the steel. The CGS performance was enhanced under hydrodynamic condition than static condition in 15 wt.% HCl while the opposite was the case in 10 wt.% H2SO4. Density Functional Theory (DFT) calculations and Monte-Carlo (MC) dynamics simulations supported the experimental findings of the CGS inhibition potentials for steel surface in the studied media. This study showcases the high potential of employing CGS for effective control of the corrosion, even at low dosage, in industrial applications involving the use of highly reactive acids at higher temperatures where economically viable operations are necessary.