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dc.contributor.advisorIbrahim, Taleb
dc.contributor.advisorKhamis, Mustafa
dc.contributor.authorDokmaji, Tamara Georgesaleh
dc.date.accessioned2019-02-18T07:54:40Z
dc.date.available2019-02-18T07:54:40Z
dc.date.issued2018-12
dc.identifier.other35.232-2018.37
dc.identifier.urihttp://hdl.handle.net/11073/16396
dc.descriptionA Master of Science thesis in Chemical Engineering by Tamara Georgesaleh Dokmaji entitled, “Removal of Hexavalent Chromium from Wastewater using Modified Multiwall Carbon Nanotubes”, submitted in December 2018. Thesis advisor is Dr. Taleb Ibrahim and thesis co-advisor is Dr. Mustafa Khamis. Soft and hard copy available.en_US
dc.description.abstractRecently, the interest and research on the removal of heavy metals from wastewater have dramatically increased due to the adverse effects they have on humans, flora and fauna. Chromium, which is a heavy metal, is the tenth most abundant element in the universe and naturally occurs in the form of hexavalent chromium [Cr(VI)] and trivalent chromium [Cr(III)]. In this thesis, an adsorption technique using modified multiwall carbon nanotubes (MWCNTs) is investigated for Cr(VI) removal from wastewater. The surface of the MWCNTs was modified with a cationic surfactant, cetyl trimethylammonium bromide (CTAB). Surface characterization was conducted using Fourier Transform Infrared spectroscopy (FTIR), Thermal Gravimetric Analyzer (TGA), Scanning Electron Microscope (SEM), and Energy Dispersive X-ray Spectroscope (EDS) in which a thorough review of results revealed that MWCNTs modification with CTAB was successful. The optimum conditions for adsorption using MWCNTs-CTAB were determined. The optimum values in terms of adsorbent dosage, contact time, pH, and temperature were found to be 0.05 g, 25 min, 4.5, and 25 oC, respectively. Fitting equilibrium data using various isotherm models revealed that the adsorption of Cr(VI) on MWCNTs-CTAB follows a Langmuir isotherm model with maximum adsorption capacity of 27.78 mg/g and Langmuir adsorption capacity of 3.956 L/mg. In addition, kinetic parameters were also fitted on several models and the data revealed that MWCNTs-CTAB followed a pseudo- second order reaction model with rate constant 9.85*10-4 g/mg.min. A thermodynamic study showed that the proposed adsorption process is spontaneous, endothermic and the mode of adsorption is physisorption with Gibbs free energy of -1.3 kJ/mol at 25 oC. From this batch experimental study, it can be concluded that the removal of Cr(VI) from wastewater using MWCNTs-CTAB was successful and a removal efficiency of 98% was achieved at the selected optimum conditions.en_US
dc.description.sponsorshipCollege of Engineeringen_US
dc.description.sponsorshipDepartment of Chemical Engineeringen_US
dc.language.isoen_USen_US
dc.relation.ispartofseriesAmerican University of Sharjah Student Worken_US
dc.relation.ispartofseriesMaster of Science in Chemical Engineering (MSChE)en_US
dc.subjectMultiwall carbon nanotubesen_US
dc.subjectAdsorptionen_US
dc.subjectHexavalent chromiumen_US
dc.subjectCetyl trimethylammonium bromideen_US
dc.subjectIsotherm modelsen_US
dc.subjectKineticen_US
dc.titleRemoval of Hexavalent Chromium from Wastewater using Modified Multiwall Carbon Nanotubesen_US
dc.typeThesisen_US


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