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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.
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.
ON THE STABILITY OF A WET-LAND MODEL
Hashem, Ali A. 한국전산응용수학회 2001 The Korean journal of computational & applied math Vol.8 No.3
Mathematical models for studying the effect of ecological changes caused by the excessive growth of wild changes on the existence of various species in wet-land are investigated. Local stability criteria is also discussed. AMS Mathematics Subject Classification : 92D40, 34D20
Md.Hashem Ali Khan(모하마드 하심 알리 칸),Moon Ho Lee(이문호) 대한전자공학회 2011 대한전자공학회 학술대회 Vol.2011 No.12
In this paper, we proved three theorems based on Gaussian distribution. Gaussian probability distribution is perhaps the most used distribution in all of science. The Gaussian distribution is a continuous function which approximates the exact binomial distribution of events. This paper traces the origins of the Gaussian probability distribution is summarized.
Ameen Ali Abu-Hashem,Ahmed S. Aly 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.3
2-Hydrazinyltetrahydropyrimido [4, 5-b] quinolin-4(3H)-one (3) was prepared by desulfurization reaction of S- and N-dimethyl derivatives 2 with hydrazine hydrate. Reactions of (3) with malonitrile, carbondisulfide, potassium thiocyanate, phthalic anhydride and aromatic aldehydes afforded 3, 5-di aminopyrazolopyrimido [4, 5-b] quinoline (4), triazolotetrahydropyrimido [4, 5-b] quinoline (5), aminotriazolopyrimido [4, 5-b] quinoline (6), aminophthalimidopyrimido [4, 5-b] quinoline (7) and N-arylidene hydrazinepyrimido [4, 5-b] quinoline 8a-d, respectively. Furthermore, 8a-d reacted with mercaptoacetic acid gave the thiazolidinonepyrimido [4, 5-b] quinoline 9a-d, which afforded the thiazolotriazolopyrimido [4, 5-b] quinolinone 10a-d upon treatment with ethanolic potassium hydroxide. The newly synthesized compounds were characterized by elemental analyses, IR, 1H-NMR, 13C-NMR and mass spectrometer. The investigated compounds were screened for their cytotoxicity. Compounds 4, 6 and 5 exhibited potent antitumor activity.