Material Science & Engineering World Conference 2026

Abstract

Abstract: 
This study proposes the synthesis and characterization of hybrid membranes based on polyvinyl alcohol (PVA) incorporated with different concentrations of carbon quantum dots (CQDs). CQDs will be synthesized using the hydrothermal method, which is recognized as an environmentally friendly and cost-effective process, as well as for enabling short synthesis times and adequate control of particle size. Citric acid is used as the carbon precursor, and urea as the nitrogen source to dope the CQD structure.
Visible-light-driven photocatalysts prepared using renewable resources are crucial, yet challenging to develop, for the efficient degradation of organic pollutants, which is essential to address the increasing deterioration of water quality. In this context, this study also reports the development of a visible-light-responsive photocatalyst based on PVA-CQD hybrid membranes, designed to enhance photocatalytic performance under environmentally benign conditions.
PVA-CQD films will be prepared using the solution casting method, dissolving PVA in distilled water and gradually adding CQDs at different weight percentages relative to PVA. Subsequently, the solution will undergo a controlled evaporation process to form homogeneous films with CQD concentrations of 0%, 0.25%, 0.5%, 1%, and 2%.
The films will be characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-Vis), photoluminescence (PL) measurements, and scanning electron microscopy (SEM).
The results are expected to demonstrate that the incorporation of CQDs improves the structural and photocatalytic properties as the CQD concentration increases in the membranes, enhancing their potential application in filtration and water treatment processes.
This research aims to contribute to the development of sustainable and efficient materials for water purification and filtration, as well as to the field of nanocomposite membranes and the use of polymers in addressing water supply challenges. In this way, costs can be reduced and the efficiency of membrane-based processes can be improved.