研究目的
To develop a visible light responsive photocatalyst for gas phase CO2 photoreduction by incorporating CQDs and Cu2O, forming CQDs/Cu2O nanocomposite, aiming to mitigate the abundance of CO2 in the earth’s atmosphere.
研究成果
The CQDs/Cu2O nanocomposite photocatalyst with good optical, physical and chemical properties was able to reduce CO2 to C2H6 under visible light irradiation. The improvement in the photocatalytic activity of the CQDs/Cu2O nanocomposite photocatalyst of up to 54% compared to that of pristine Cu2O demonstrated that incorporation of CQDs with Cu2O was able to retard the recombination of the photogenerated charge carriers where CQDs serve as an electron acceptor to extract electrons from Cu2O. The CQDs/Cu2O nanocomposite also exhibited an excellent photostability under repeated cycles of photoreaction.
研究不足
The slight reduction in the photocatalytic activity of the CQDs/Cu2O nanocomposite after each cycle is probably due to the loss of active sites by the accumulation of carbonaceous intermediates.
1：Experimental Design and Method Selection:
CQDs were synthesized via a top-down hydrothermal method using biochar as the carbon source. The CQDs/Cu2O nanocomposite was prepared via a simple wet impregnation method.
2：Sample Selection and Data Sources:
Biochar from empty fruit bunches (EFB) of oil palms was used as precursors to prepare CQDs. Commercial copper (I) oxide nanopowder (Cu2O) was obtained from US Research Nanomaterials, Inc.
3：List of Experimental Equipment and Materials:
High resolution transmission electron microscope (HRTEM, Tecnai TF20 X-Twin FEI Company), X-ray photoelectron spectroscopy (XPS, PHI Quantera II, Physical Electronics), X-ray diffraction (XRD, Shimadzu 6000), Fourier Transform Infrared spectroscopy (FTIR, Nicolet 6700, Thermo Nicolet), UV-vis spectra (Lambda 35, Perkin Elmer spectrophotometer), photoluminescence (PL) emission spectra (LS 55, Perkin Elmer PL spectrometer).
4：Experimental Procedures and Operational Workflow:
The photocatalytic activities of pure CQDs, Cu2O and CQDs/Cu2O nanocomposite were investigated for gas phase photoreduction of CO2 under visible-light irradiation.
5：Data Analysis Methods:
The product gases evolved during the CO2 photoreduction process were monitored periodically for every hour and the concentration of the product gases was analyzed by means of an online gas chromatography (GC) (Agilent 7890A) equipped with thermal conductivity detector (TCD) and flame ionization detector (FID).
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
