Flourescent carbon dots synthesized from guave (Psidium guajava) leaves for the selective detection of Fe3+ ions at different concentration/ Joab C. Canosa, Dwald Jana A. Miranda, and Jillian Mae A. Rivera .--

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Canosa, Joab C [author ]

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TextPublication details: Manila: Technological University of the Philippines, 2024.Description: vii, 74pages: 29cm. +1 CD-ROM (4 3/4in.)Content type:

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BTH RB 37 C36 2024

Dissertation note: College of Science .-- Bachelor of Applied Science in Laboratory Technology: Technological University of the Philippines, 2024. Summary: The presence of heavy metal pollutants in water is considered a worldwide threat. Existing methods of detecting these heavy metals, including ferric ions, are expensive and require expertise. Therefore, a facile synthesis and use of fluorescent carbon dots for the selective detection of ferric ions was explored. Fluorescent carbon dots were produced via solvothermal synthesis using guava leaves as a precursor for the selective detection of Fe3+ ions. The resulting guava carbon dots (G-CDs) were characterized using UV-Vis, FTIR, TEM-EDS, and a Spectrofluorophotometer. UV-Vis analysis revealed distinct peaks at 664 nm and 298 nm. FTIR analysis indicated the presence of various functional groups, including O-H stretching, C-H stretching, C=C stretching, C-O stretching, and C-H out-of- plane bend. TEM imaging revealed an average particle size of G-CDs measuring 8.7 nm with a quasi-spherical shape. EDS analysis confirmed an abundant presence of element carbon at 94.9%, with oxygen at 4.8%, and phosphorus at 0.3%. Spectrofluorophotometer produced a PL spectrum indicating an emission wavelength of 677 nm, corresponding to the red color of synthesized G-CDs. Selective ion detection of Fe3+ was also observed in the PL spectra along with the control containing G-CDs and EDTA with the selected metal ions: Hg2+, Zn2+, Cu2+and Pb2+. PL quenching was exhibited towards Fe3+ with no quenching for the remaining metal ions. High specificity in detecting Fe3+ was also observed in the concentration range of 100-400 μM, indicating a decrease in PL quenching.

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Item type	Current library	Shelving location	Call number	Copy number	Status	Notes	Date due	Barcode
Bachelor's Thesis COS	TUP Manila Library	Thesis Section-2nd floor	BTH RB 37 C36 2024 (Browse shelf(Opens below))	c.1.	Not for loan	For library use only		BTH0004984

Thesis (undergraduate)

College of Science .-- Bachelor of Applied Science in Laboratory Technology: Technological University of the Philippines, 2024.

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The presence of heavy metal pollutants in water is considered a worldwide threat. Existing
methods of detecting these heavy metals, including ferric ions, are expensive and require
expertise. Therefore, a facile synthesis and use of fluorescent carbon dots for the selective
detection of ferric ions was explored. Fluorescent carbon dots were produced via
solvothermal synthesis using guava leaves as a precursor for the selective detection of Fe3+
ions. The resulting guava carbon dots (G-CDs) were characterized using UV-Vis, FTIR,
TEM-EDS, and a Spectrofluorophotometer. UV-Vis analysis revealed distinct peaks at 664
nm and 298 nm. FTIR analysis indicated the presence of various functional groups,

including O-H stretching, C-H stretching, C=C stretching, C-O stretching, and C-H out-of-
plane bend. TEM imaging revealed an average particle size of G-CDs measuring 8.7 nm

with a quasi-spherical shape. EDS analysis confirmed an abundant presence of element
carbon at 94.9%, with oxygen at 4.8%, and phosphorus at 0.3%. Spectrofluorophotometer
produced a PL spectrum indicating an emission wavelength of 677 nm, corresponding to
the red color of synthesized G-CDs. Selective ion detection of Fe3+ was also observed in
the PL spectra along with the control containing G-CDs and EDTA with the selected metal
ions: Hg2+, Zn2+, Cu2+and Pb2+. PL quenching was exhibited towards Fe3+ with no
quenching for the remaining metal ions. High specificity in detecting Fe3+ was also
observed in the concentration range of 100-400 μM, indicating a decrease in PL quenching.

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