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dc.contributor.advisorTarafa-Vélez, Pedro J.
dc.contributor.authorAvilés-Miranda, Amarillys
dc.date.accessioned2018-10-25T13:31:09Z
dc.date.available2018-10-25T13:31:09Z
dc.date.issued2016
dc.identifier.urihttps://hdl.handle.net/20.500.11801/1064
dc.description.abstractThe release of toxic chemicals, as herbicides from agricultural activities is causing contamination of surface water by runoffs action after precipitation. This research studied the degradation of atrazine (herbicide) by a porous glass substrate, embedded with photo-catalytic titanium dioxide (TiO2) nanoparticles. Porous substrate was attained by sintering clear recycled glass cullets (MG-30) in a furnace at temperatures between 950ºC to 975ºC for 45 to 75 minutes. The TiO2 nanoparticles were deposited within or onto the glass substrate and immobilized by heat treatment. The polymorph phase of the immobilized TiO2 was analyzed after the heat treatment by x-ray diffraction (XRD). Also, a percolation and compressive strength were studied to evaluate the thermo-mechanical properties of the material. The experimental results demonstrated that the TiO2 immobilization was favored by sintering nanoparticles within the glass particles, under UV light exposure atrazine degradation capacity was low. On the other hand, the immobilization of the nanoparticles onto the surface increased after the heat treatment. In addition, the XRD analyses confirmed the anatase polymorph phase of the nanoparticles. For the deposition onto the glass substrate, atrazine degradation fell below detection limits after 12 h of UV light exposure with possible exhaustion of the TiO2 nanoparticles after 36 h of treatment. Finally, that percolation rate declined for longer sintering time and higher sintering temperature. Conversely, the compressive strength increases for similar sintering parameter changes.en_US
dc.description.sponsorshipThe USDA–NIFA and Trainings in Agriculture and Related Science (CETARS) program under grant Nº 2011-38422-3083 and the National Science Foundation (NSF) under grants Nº0833112 & 1345156 (CREST program).en_US
dc.language.isoenen_US
dc.subjectatrazine degradationen_US
dc.subject.lcshTitanium dioxideen_US
dc.subject.lcshAtrazineen_US
dc.subject.lcshPhotodegradationen_US
dc.titleImmobilization of titanium dioxide in crushed recycled glass for atrazine photo-degradationen_US
dc.typeThesisen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2016 Amarillys Avilés Mirandaen_US
dc.contributor.committeeSuárez, O. Marcelo
dc.contributor.committeeHwang, Sangchul
dc.contributor.representativeAcevedo Rullán, Aldo
thesis.degree.levelM.S.en_US
thesis.degree.disciplineCivil Engineeringen_US
dc.contributor.collegeCollege of Engineeringen_US
dc.contributor.departmentDepartment of Civil Engineeringen_US
dc.description.graduationSemesterFallen_US
dc.description.graduationYear2016en_US


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    Items included under this collection are theses, dissertations, and project reports submitted as a requirement for completing a graduate degree at UPR-Mayagüez.

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