Flourescent carbon dots synthesized from guave (Psidium guajava) leaves for the selective detection of Fe3+ ions at different concentration/
Canosa, Joab C.
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 .-- - Manila: Technological University of the Philippines, 2024. - vii, 74pages: 29cm. +1 CD-ROM (4 3/4in.)
Thesis (undergraduate)
College of Science .--
Includes bibliography:
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.
Heavy metal pollutants
Water pollutants
Solvothermal
BTH RB 37 / C36 2024
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 .-- - Manila: Technological University of the Philippines, 2024. - vii, 74pages: 29cm. +1 CD-ROM (4 3/4in.)
Thesis (undergraduate)
College of Science .--
Includes bibliography:
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.
Heavy metal pollutants
Water pollutants
Solvothermal
BTH RB 37 / C36 2024