Remediation of Trivalent and Hexavalent Chromium Ions from Aqueous Solutions Using Titanium Dioxide Polymorphs

Author

Yvette Cantu, The University of Texas Rio Grande Valley

Date of Award

12-2017

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Chemistry

First Advisor

Dr. Jason G. Parsons

Second Advisor

Dr. Evangelia Kotsikorou

Third Advisor

Dr. Jose J. Gutierrez

Abstract

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.

Comments

Copyright 2017 Yvette Cantu. All Rights Reserved.

https://www.proquest.com/dissertations-theses/remediation-trivalent-hexavalent-chromium-ions/docview/2015044868/se-2?accountid=7119

Recommended Citation

Cantu, Yvette, "Remediation of Trivalent and Hexavalent Chromium Ions from Aqueous Solutions Using Titanium Dioxide Polymorphs" (2017). Theses and Dissertations. 256.
https://scholarworks.utrgv.edu/etd/256