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- 저자 : Chukwunonso Onyeka Aniagor (검색결과 2 건)
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Ali Hashem,Chukwunonso Onyeka Aniagor,Mohamed Abdel-Fattah Afifi,Ashraf Abou-Okeil,Sayed Hussein Samaha 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.10
To entrench heavy metal chelation functional groups, native corn starch was grafted with acrylonitrile and subsequently hydrolyzed (using sodium hydroxide) to produce chemically crosslinked superabsorbent hydrogels (SAHs) of three-dimensional hydrophilic polymeric networks. SAHs demonstrated fast swelling and superabsorbent properties, with a swelling capacity of 612 g water/g SAHs. Due to the usefulness of equilibrium and kinetic data for elucidating the nature of adsorbate-adsorbent interaction, the adsorption study was extensively modelled using selected nonlinear isotherm and kinetics models. The Toth and intraparticle diffusion models satisfactorily predicted the isotherm and kinetic data, respectively, while the dominance of the metal complexation mechanism was asserted in the study. Meanwhile, the metal ion uptake by SAHs occurred at a fast equilibration time of 20 min. Furthermore, the adsorbent’s instrumental characterization (scanning electron microscopy, SEM; Energy dispersion X-ray, EDX; X-ray diffraction, XRD and Fourier-transform infrared spectroscopy, FTIR) result confirmed that SAHs possesses the desired metal chelation properties. Thus, the potential application of the developed SAHs as biosorbent in the decontamination of the heavy metal-laden stream was explicitly demonstrated in the study.
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Ali Hashem,Chukwunonso Onyeka Aniagor,Sayed Mohamed Badawy,Ghada Mohamed Taha 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.11
A novel biosorbent (‘Manna_COOH’) was synthesized via dual reaction stages of direct carbonylation of hydroxyl groups of richly cellulosic manna root powder and subsequent esterification of the resultant anhydride analogue into an ester of high carboxyl content. Both the biosorbent precursor and the 2,3-dihydroxybutanedioic acid sustain complementary features that ensured their efficient complexation. The biosorbent depicted a carboxyl content of 412.36 m.eq -COOH/100 g sample and was characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR). The study further evaluated the cobalt ion adsorption capacity of the synthesized ‘Manna_COOH’ under the effect of some process variable via batch mode. The Freundlich and pseudo-second-order models emerged as the best fit for the equilibrium and kinetic data, respectively. The rich oxygen-based surface functional groups entrenched on the ‘Manna_COOH’ sequel to its functionalization played a major role in making it a promising biosorbent for aqueous Co (II) uptake.
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