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- 저자 : Al-Rawajfeh (검색결과 5 건)
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Aiman E. Al-Rawajfeh,Ehab M. Al-Shamaileh,Khaldoon Al-Whoosh,Alaa Al-Maabrah,Ramzi Al-Zorqan,Rana Zanoon,Khalid Rawajfeh,Saleh Al-Jufout 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
The release of chlorine in the electrodeionization (EDI) unit causes corrosion in the EDI unit, damaging ion exchange membranes and creating a safety risk for the workers. In this work, adsorption desalination of Cl ions on low-cost composite synthetic–natural Jordanian materials were investigated as an approach to prevent the release of corrosive chlorine gas at the positive electrode. The percentage removal reaches 25% at 25 min shaking time to 55% at 120 min, in a single batch experiment. The values of DH0, DS0, and DG0 indicate the favorability of physisorption. Zeolite and Pozzolana represent potential adsorbents of chloride.
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Enhancement effect of phosphate and silicate on water defluoridation by calcined gypsum
Al-Rawajfeh, Aiman Eid,Alrawashdeh, Albara I.,Aldawdeyah, Asma,Hassan, Shorouq,Qarqouda, Ruba Techno-Press 2013 Advances in environmental research Vol.2 No.1
Research work on removal of fluoride from water, referred to as water defluoridation, has resulted into the development of a number of technologies over the years but they suffer from either cost or efficiency drawbacks. In this work, enhancement effects of phosphate and silicate on defluoridation of water by low-cost Plaster of Paris (calcined gypsum) were studied. To our knowledge, the influence of silicate on defluoridation was not reported. It was claimed, that the presence of some ions in the treated water samples, was decreasing the fluoride removal since these ions compete the fluoride ions on occupying the available adsorption sites, however, phosphate and silicate ions, from its sodium slats, have enhanced the fluoride % removal, hence, precipitation of calcium-fluoro compounds of these ions can be suggested. Percentage removal of $F^-$ by neat Plaster is 48%, the electrical conductance (EC) curve shows the typical curve of Plaster setting which begins at 20 min and finished at 30 min. The addition of phosphate and silicate ions enhances the removal of fluoride to high extent > 90%. Thermodynamics parameters showed spontaneous fluoride removal by neat Plaster and Plaster-silicate system. The percentage removal with time showed second-order reaction kinetics.
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Carbon dioxide storage in Dead Sea water
Mohammad Al-Harahsheh,Raghad Al-Khatib,Aiman Al-Rawajfeh 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
In this paper, the Dead Sea (DS) environment as a carbon dioxide (CO2) potential storage site wasinvestigated. Firstly, the storage capacity of CO2 in ultra-pure and Dead Sea water (DSW) was studied atambient temperature and pressure. The effect of CO2 pressure on the storage capacity of CO2 in DSW wasalso studied at different contact times at the ambient temperature. Finally, for comparison purposes, CO2gas was injected into a solution containing only dissolved calcium ions. Different analytical andinstrumental analysis techniques were used to characterize both liquid and solid samples including acidbase titration, Atomic Absorption Spectrometry (AAS), X-ray Diffraction analysis (XRD), Thermogravi-metric Analysis (TGA), and Scanning Electron Microscopy (SEM). Based on the titration method, thestorage capacity of CO2 in both pure water and DSW was found to be 1.7 and 1.53 mmol/l, respectively, atambient temperature (15 C) and ambient pressure. DSW water was found to contain 1.6 Ca wt% and4.3 wt% Mg based on AAS analysis. The storage capacity of CO2 in DSW increased with the increase ofpressure and despite the high content of Ca and Mg in DSW, no precipitation was observed even at a CO2pressure of 25 bar and 76 h of contact time. When DSW, saturated with CO2, was titrated (using NaOH),precipitates were obtained containing aragonite, brucite and magnesite as identified by XRD, TGA andSEM analysis techniques. The majorfinding of this work is that DS water is suitable environment to beused to sequester CO2.
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CaCO3–CO2–H2O system in falling film on a bank of horizontal tubes: Model verification
Aiman Eid Al-Rawajfeh 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.6
The purpose of this work is to model the CaCO3–CO2–H2O system in falling film on a bank of horizontal tubes. The model was applied on a 5-effects reference thermal vapor compression multiple-effect distiller (MED-TVC) operating at top brine temperatures (TBT) of 60–70 8C. The model can predict pH values, CaCO3 deposition and fouling resistance with greater accuracy. Through the MED stages, the HCO3 and CO2 concentrations slightly increased while the CO32 concentration slightly decreased. The pH decreased from 8.8 in the first stage to 8.4 in the 5th stage. The CO2 release rates as well as the CaCO3deposition rates increase with increasing top brine temperature (TBT). CO2 release rates decrease from 36.4 g/t feed water in the first stage to 32.5 g/t in the last stage. The specific CaCO3 deposition decreases from 127.3 g/t feed water in the first stage to 100.1 g/t in the last stage. 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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Aiman E. Al-Rawajfeh,Ehab M. Al-Shamaileh,Mohammad R. Alrbaihat 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.73 No.-
This study investigated a mechanochemical process for synthesizing slow-release fertilizers of kaoliniteand KH2PO4/(NH4)2HPO4 in separate systems by milling in a planetary ball mill. Tests with kaolinitecontents ranging from 25 to 75 wt % and mill rotational speeds at 600 rpm for 2 h were performed toevaluate incorporation of KH2PO4 and (NH4)2HPO4 and release of K+, NH4+ and PO43 ions into solution. X-ray diffraction (XRD), Thermal gravimetric analysis (TGA), Fourier transformation infraredspectrometry (FTIR) and ion chromatography (IC) were used to analyze the synthesized samples andindicated that the mechanochemistry (MC) process was successfully applied to incorporate both KH2PO4and (NH4)2HPO4 into the amorphous kaolinite structure. Release of K+ and PO43 ions from the system(kaolinite–KH2PO4) when dispersed in water for 24 h reached up to 15 to 40 ppm respectively. Undersimilar conditions for the system (kaolinite–(NH4)2HPO4), release of NH4+ and PO43 ions reachedbetween 303.2 and 415.1 (ppm) respectively. These results indicated that the MC process could developedto allow amorphous kaolinite to act as a carrier of K+, NH4+ and PO43 nutrients to be released slowly foruse as fertilizer.
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