Theses and Dissertations

Date of Award


Document Type


Degree Name

Master of Science (MS)



First Advisor

Dr. Jason G. Parsons

Second Advisor

Dr. Evangelia Kotsikorou

Third Advisor

Dr. Jose J. Gutierrez


Three titanium dioxide (TiO2) polymorphs were synthesized and used for the removal of chromium (III) and chromium (VI) from aqueous solutions. Various solution parameters were studied to determine the effects of pH, temperature, time, possible interfering ions, and capacities on the binding of Cr(III) and Cr(VI) to all three polymorphs. pH assays determined the optimum pH for the binding of both Cr(III) and Cr(VI) to each polymorph. Adsorption isotherms determined that the adsorption of Cr(III) was non-spontaneous for the three polymorphs with ΔG values ranging from 6.03 to 12.89 kJ/mol. Furthermore, the binding of Cr(VI) to anatase was also non-spontaneous with values ranging from 1.81 to 10.72 kJ/mol. The binding of Cr(VI) for both brookite and rutile was spontaneous with ΔG values ranging from –0.22 to –3.04 kJ/mol.


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