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- 저자 : Alqadami, Ayoub Abdullah (검색결과 3 건)
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Alqadami, Ayoub Abdullah,Khan, Moonis Ali,Otero, Marta,Siddiqui, Masoom Raza,Jeon, Byong-Hun,Batoo, Khalid Mujasam Elsevier 2018 Journal of cleaner production Vol.178 No.-
<P><B>Abstract</B></P> <P>A new, simple, clean, and green procedure for the production of a magnetic nanocomposite (MBBC) from waste camel bone biochar was here described. MBBC particles were in the nano-size range (∼12 nm), having characteristics of both hydroxyapatite and magnetite. The produced nanocomposite was characterized by FT-IR, XRD, TG, SEM, TEM, BET, XRD, Zeta potential and XPS analyses. MBBC exhibited a paramagnetic behavior, having a saturation magnetization of 50.20 emu/g and a mesoporous structure with a BET surface area of 162 m<SUP>2</SUP>/g. The FT-IR spectrum of MBBC displayed doublet peaks at 573–601 cm<SUP>−1</SUP> (corresponding to Fe–O vibrations) and a peak at 1046 cm<SUP>−1</SUP> (associated with HPO<SUB>4</SUB>), which support the successful formation of MBBC. The maximum adsorption capacities of MBBC, as for the Langmuir isotherm model fittings, were 344.8, 322.6 and 294.1 mg/g for Pb(II), Cd(II) and Co(II), respectively. MBBC showed rapid heavy metals adsorption rates, accomplishing ∼75% adsorption within 5 min. After adsorption accomplishment, MBBC particles were magnetically separated from treated water and heavy metals from saturated MBBC were efficiently desorbed by elution with 0.01 M HCl. Under such elution, the MBBC stability against acid leaching of Fe was proved. Hence, it could be inferred that the production of MBBC from waste camel bones and its utilization for the removal of heavy metals from water is a novel approach within the cleaner production concept.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A magnetic nanocomposite (MBBC) was produced from waste camel bone biochar. </LI> <LI> MBBC was ∼12 nm particle size, paramagnetic and mesoporous with 162 m<SUP>2</SUP>/g BET area. </LI> <LI> Pb(II), Cd(II) and Co(II) adsorption capacities on MBBC were 345, 323 and 294 mg/g. </LI> <LI> Metals recovery from saturated MBBC was maximum (85–90%) with 0.01 M HCl. </LI> <LI> Deniable leaching of Fe occurred from MBBC during desorption with 0.01 M HCl. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Abdulrahman S.M. Alqadami,Mohd Aminudin Jamlos,Mohd Aminudin Jamlos 한국물리학회 2019 Current Applied Physics Vol.19 No.11
The recently introduced polymeric nanocomposites substrate layer technology is used in the design of a flexible antenna array for wearable applications. This new technology allows a considerable widening of the bandwidth of classical microstrip topologies. This means that a relatively wide band can be combined with a full ground plane in a very simple structure, which is an ideal combination in wearable applications. The wideband and flexible features enabled the antenna to mitigate body-detuning effects. The proposed antenna prototype consists of a 2×2 array of rectangular patch elements with dimensions of 70×70×4.2mm3. The measurements are performed in free space, and on-body under bent conditions. The antenna working within the frequency band of 5 GHz–8.2 GHz, with a fractional impedance (FBW) bandwidth of 50.34%. The antenna demonstrates a maximum radiation efficiency of 60%, and 9.8 dB of realized gain. Since this antenna is intended for on body-centric wireless communication application, the specific absorption rate is evaluated when the antenna is placed on the right arm of a realistic human phantom. The performances and features of the proposed antenna paved the way for off-body connections in a WBAN and wearable applications including WiFi, telemedicine and Vehicle-to- Everything (V2X).
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Tansir Ahamad,Mu. Naushad,Basheer M. Al-Maswari,Jahangeer Ahmed,Zeid A. AlOthman,Saad M. Alshehri,Ayoub Abdullah Alqadami 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
A mesoporous magnetic zirconium phosphate was prepared for the removal of Hg2+ from aqueous medium. The saturation magnetization of pure Fe3O4 and Fe3O4@ZrP was observed 82.9 and 62.4 emu/g, respectively. The effect of different adsorption parameters was studied. The kinetic data were fitted to the pseudo 1st and pseudo 2nd order models whereas the adsorption process was best fitted into the pseudo 2nd order model. The adsorption isotherm could be well described with Langmuir model, with the maximum adsorption capacity of 181.8 mg g1 at 25 C. Thus, the present studies suggested that Fe3O4@ZrP have remarkable potential for Hg2+ removal from contaminated water.
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