000			03491nam a22002897a 4500
003			OSt
005			20241113112729.0
008			241113b |||||||| |||| 00| 0 eng d
040			_aTUPM _bEnglish _cTUPM _dTUPM _erda
050			_aBTH RB 37 _bM43 2024
100			_aMedina, Rajie A. _eauthor
245			_aHydrothermal synthesis of spent coffee grounds carbon dots as photosynthesis enhancer on black behi pechay ( Brassica chinesis L.) / _cRajie A. Medina, Crizzel Fe M. Dela Cruz, and Antonette G. Ramirez .--
260			_aManila: _bTechnological University of the Philippines, _c2024.
300			_a103pages: _c29cm. _e+1 CD-ROM (4 3/4in.)
336			_2rdacontent
337			_2rdamedia
338			_2rdacarrier
500			_aThesis (undergraduate)
502			_aCollege of Science .-- _bBachelor of Applied Science in Laboratory Technology: _cTechnological University of the Philippines, _d2024.
504			_aIncludes bibliography:
520			_aThe researchers aimed to provide low-cost, environmentally friendly, and long-lasting ways of producing Carbon Quantum Dots (CQDs) by utilizing hydrothermal synthesis for the evaluation of their antimicrobial activities and optical properties. The leaf and bark extract of the mangrove (Rhizophora stylosa Griff.) plant was used in this study to produce carbon quantum dots using the hydrothermal method, and CQDs were characterized using UV-vis, FTIR, SEM, EDX, DLS, and an application for the optical property using Spectrofluorophotometer. The result revealed that the characterization demonstrates the effective synthesis of CQDs. UV-Vis spectroscopy occurred at wavelengths of 383 nm and 417 nm for the CQD-L and CQD-B series. Fourier Infrared spectroscopy revealed different peaks, including O-H stretching on Pure-B, Pure-L, CQD-B, and CQD-L, and N-H stretching on both CQD-B and CQD-L. Scanning Electron Microscopy (SEM) revealed a homogeneous and scattered appearance, with a smooth texture and an aggregated structure manifested as spherical-shaped, and also, rough, appearing round, clustered, and heterogeneous of CQD-L, and CQD-B respectively. Energy Dispersive X-ray Spectroscopy (EDX), for CQD-L had 56.6% content of carbon, whereas the CQD-B had a composition of carbon of 38.0%. Dynamic Light Scattering (DLS) hydrodynamic size yielded 749.7±51.11 d.nm and 542.5±72.48 d.nm, with polydispersity indexes of 0.4290.042 and 0.5560.102, and zeta potentials of -11.20.416 mV and -32.7-1.68Mv of CQD-L and CQD-B, respectively. Spectrofluorophotometer indicated a blue color for CQD-B and a red color for CQD-L, which are both parallel to the ultraviolet-visible spectrum. The phytochemical components connected with the mangrove (Rhizophora stylosa Griff.) plant have been successfully utilized to create Carbon Quantum Dots (CQDs). Only pure mangrove bark extract revealed antibacterial activity against S. aureus in an antimicrobial experiment, with an antimicrobial index (AI) of 0.8, but the remaining samples showed no antimicrobial action against E. coli, S. aureus, as well as C. albicans. As a result, for antibacterial tests, the pure bark was vulnerable to gram-positive bacteria. Keywords: Carbon Quantum Dots (CQDs), Hydrothermal method, Phytochemical components
650			_aLaboratory technology
650			_aAgricultural waste materials
700			_aDela Cruz, Crizzel Fe M. _eauthor
700			_aRamirez, Antonette G. _eauthor
942			_2lcc _cBTH COS _n0
999			_c29053 _d29053