The Study of Nanoparticle Titanium Dioxide-Based Hydrogel for Dye Adsorption and Photo-Degradation, 2019

Atlanta University and Clark Atlanta University Theses and Dissertations
The Study of Nanoparticle Titanium Dioxide-Based Hydrogel for Dye Adsorption and Photo-Degradation, 2019
Alsharari, Reem M.
Contributor to Resource:
Bu, Xiu R.
John H. Hall
Williams, Myron N. V.
Date of Original:
Degrees, Academic
Dissertations, Academic
United States, Georgia, Fulton County, Atlanta, 33.749, -84.38798
Degree Type: thesis
Degree Name: Master of Science (MS)
Date of Degree: 2019
Granting Institution: Clark Atlanta University
Department/ School: Chemistry
The objective of this research was to study the adsorption and photodegradation of crystal violet (CV) dye by using poly(2-hydroxyethylmethacrylate) (PHEMA) hydrogel and nanocomposite TiO2-PHEMA hydrogel. Since the TiO2 nanoparticle has poor solubility, another goal of this study was to make a uniform TiO2 nanocomposite gel. These gels can be used in water treatment and can be easily photodegrade by exposure of sunlight which is similar to exposing to UV-vis. PHEMA was synthesized by free radical polymerization. The nanocomposite gels were characterized by FT-IR and XRD to confirm the presence of TiO2 nanoparticles and CV dye inside the PHEMA hydrogel. The XRD data showed that not only maintaining the crystallinity of the three different phases that had been used, but also the uptake of the dye inside the nanocomposite gels. Moreover, the FT-IR demonstrated the presence of the functional groups of the chemical structure of the gel as well as the nanocomposite gels with the CV dye. The adsorption of CV dye was examined through monitoring UV-Vis absorption. The kinetic study indicated the adsorption of the dye by the nanocomposite gels until reached equilibrium, which is the zero concentration. The photodegradation of CV dye was examined using a medium pressure Hg lamp. It was determined that the composite gels adsorb CV dye from the solution at the beginning while under the photochemical condition. Eventually, the dye in the gel was photodegraded, indicating that in the gel system, the photodegradation process is still effective to dyes. The composite gels containing pure anatase phase titanium are much better photocatalysts and took less time of adsorption than those containing pure rutile and anatase/rutile mixed phases of titania. KEYWORDS: Chemistry, Organic Chemistry
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Holding Institution:
Clark Atlanta University
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