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Sustainable ibuprofen degradation using eco-friendly CQDs/TiO2 nanocomposites from banana peels waste KCI 등재
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/451010
Pharmaceutical waste directly contributes to environmental pollution. Ibuprofen is one of the pharmaceutical wastes that often ends up in the environment without proper treatment, causing various harmful effects. Here, carbon quantum dots/ titanium dioxide (CQDs/TiO₂) nanocomposites synthesis as a photocatalyst for ibuprofen photodegradation has been investigated. This research consists of 3 steps: the first was initiated with CQD synthesis using the hydrothermal method derived from banana peel extract, followed by the synthesis of TiO2 rutile and anatase with banana peel extract as the reducing agent. The last was CQDs/TiO2 nanocomposites synthesis using a hydrothermal method. The CQDs/TiO2 nanocomposites obtained were characterized by TEM, FTIR, XRD, SEM-EDX, and UV-Visible spectroscopy. Bright green fluorescence of CQDs was observed under UV irradiation with a average size of 9.5 nm. The nanocomposite of CQD/ TiO2 rutile and CQD/TiO2 anatase exhibited crystalline structures, each displaying a diffraction pattern of rutile and anatase, indicating high purity. However, CQDs/TiO2 anatase has a smaller size of 8 nm than CQD/TiO2 rutile of 132 nm. Therefore, the CQDs/TiO2 anatase nanocomposite showed the most effectiveness as a photocatalyst in degrading ibuprofen, with a photodegradation percentage of up to 53.656% at pH 3, a slight photocatalyst mass of 0.1 g, and a short photodegradation time of 30 min.
Abstract
1 Introduction
2 Method
2.1 Materials
2.2 Synthesis of carbon quantum dots (CQDs)
2.3 Synthesis of TiO2 nanoparticles
2.4 Synthesis of CQDs/TiO2 nanocomposites
2.5 Photodegradation test
2.5.1 Optimization of pH
2.5.2 Optimization of photocatalyst mass
2.5.3 Optimization of photodegradation time
2.5.4 Optimization of photocatalyst type
2.5.5 Optimization of light source
2.6 Characterization
3 Result and discussions
3.1 Morphology and particle size distribution of CQDs, TiO₂ and CQDs/TiO₂
3.2 Functional groups of CQDs, TiO₂ and CQDs/TiO₂
3.3 Optical properties of CQDs
3.4 Crystal structure of TiO₂ and CQDs/TiO₂
3.5 Surface morphology and elemental composition of TiO₂ and CQDs/TiO₂
3.6 Photodegradation test
3.6.1 Optimization of pH
3.6.2 Optimization of photocatalyst mass
3.6.3 Optimization of photodegradation time
3.6.4 Optimization of photocatalyst types
3.6.5 Optimization of light source
4 Conclusion
References
