Philippine Standard Time
• The general objective of the study is to synthesize and functionalize carbon quantum dots from biowaste (kalamansi peel,, water hyacinth and pineapple peel) with a significant quantum yield of 20% relative to the standard quinine sulfate. • The specific objectives of the study are: 1. To synthesize CQD from biowaste via a simple thermal combustion and microwave irradiation as enhancement. 2. To evaluate different reagents for functionalization. 3. To characterize the produced CQDs and determine the surface functional groups present,, crystallographic structure. 4. To determine the significant factors affecting the response (QY) and to identify the optimal parameters that produce significant quantum yield. 5. To evaluate the possibility of using the synthesized CQD in the detection of E. coli bacteria in water. 6. To be able to publish papers in scientific journals.
To be able to functionalize carbon quantum dots from bio waste with different solvents and produce a quantum yield of 20% relative to the standard quinine sulfate. 1. To be able to obtain the following • CQD from biowaste via a simple thermal combustion and microwave irradiation as enhancement. • evaluate the effect of different solvents (H2SO4,, HNO3 and TEPA) on the quantum yield. • characterize the produced CQDs and determine the surface functional groups present,, crystallographic structure. • determine the significant factors affecting the response (QY) and to identify the optimal parameters that produce significant quantum yield. • To evaluate the possibility of using the synthesized CQD in the detection of E. coli bacteria in water. 2. To be able to facilitate the graduation of 1 masters and 4 undergraduate students in the development and utilization of the technology. 3. To facilitate in 1 product/ process for producing CQDs. 4. The project targets to publish in 2 ISI/ Scopus-indexed publications
Biowaste disposal is becoming a burgeoning problem,, in addition to this; improper management of waste agricultural biomass is contributing towards climate change,, water and soil contamination,, and local air pollution. This type of waste is of high value with respect to material and energy recovery. The project aims to utilize biowaste in the carbon quantum dots (CQD). Carbon-based quantum dots with fascinating properties have gradually become a rising star as a new nanocarbon member due to their nonthreatening,, abundant and inexpensive nature. This study will report on a simple,, economical and green preparative strategy toward water soluble fluorescent carbon quantum dots (CQDs) using low cost biowaste,, starting with kalamansi peels,, as a carbon source for the first time in the Philippines. Kalamansi peel,, water hyacinth and pineapple peels are renewable source with no other known potential usage. It has been chosen because of its availability,, being easily obtained all year round from tropical countries like the Philippines. The temperature to be used in the carbonization of the precursor will be determined using thermo-gravimetric analysis (TGA). An autoclave will be used in the pyrolysis of the sample and a domestic microwave oven (900W irradiating at 500W-800W power) will be used for surface passivation. The samples will be filtered using Buckner funnel using 0.22 micron filter medium. The CQD will be characterized with UV-Vis,, Spectrofluorometer,, FTIR,, XRD,, and TEM. The Quantum Yield(QY) will be determined and the CQD produced from the parameter with the optimum QY will be tested in different possible in biomedical,, optronics,, catalyst or chemical sensor applications. This study will demonstrate and focus on the technical feasibility of developing CQD from biowaste. In addition to this,, the study also aims to to evaluate the possibility of using the synthesized CQD in the detection of E. coli bacteria in water.
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