Fe2O3/carbon quantum dots complex photocatalysts and their enhanced photocatalytic activity under visible light

Abstract

In this study, we report the facile fabrication of Fe(2)O(3)/CQDs nanocomposites, and investigate their effective photocatalytic activity for the photodegradation of toxic gas (gas-phase benzene and methanol) under visible light. The crucial roles of CQDs in the enhancement of photocatalytic activity of the Fe(2)O(3)/CQDs composites are illustrated.

Synthesis of TiO₂/Carbon Nanoparticle (C-dot) Composites as Active Catalysts for Photodegradation of Persistent Organic Pollutant

“…In this study, C-dots were combined with TiO 2 and used as a catalyst in the photodegradation of PCE. The C-dots are believed to act as a source of light for the electron excitation in TiO 2 , as C-dots absorb light at a higher wavelength and emit light at a shorter wavelength due to upconversion of its photoluminescence, similar work was previously reported by Zhang et al [11] by applying Fe 2 O 3 /C-dots composite photocatalyst. A hole (h + ) will be formed when an electron on TiO 2 exits from the valence band to the conduction band, which will then react with a water or hydroxyl ion (-OH) to form a hydroxyl radical ( • OH).…”

“…However, the lowering value of TiO 2 band gap energy in the composite was not great, suggesting that the C-dots also play another role in the composites. Zhang et al [11] reported that C-dots play important roles in photocatalytic processes as an electron reservoir to trap electrons thus preventing electron-hole recombination. The oxygen radicals ( …”

Carbon Quantum Dots/Bi2WO6 Composites for Efficient Photocatalytic Pollutant Degradation and Hydrogen Evolution

“…Up to date, the design of CQDs/semiconductor composites (CQDs/TiO 2 , CQDs/SiO 2 , CQDs/ Fe 2 O 3 , CQDs/Cu 2 O, CQDs/Ag 3 PO 4 , CQDs/C 3 N 4 Þ with enhanced photocatalytic performance has been achieved. [19][20][21][22][23][24][25][26] Considering the remarkable properties of CQDs and the limitations of the Bi 2 WO 6 photocatalytic system, the combination of CQDs and Bi 2 WO 6 may be regarded as an ideal strategy to construct an e±cient composite photocatalyst.…”

Photo-Catalytic Behavior of Cdse QDS Sensitized Zr-(1,3,5-Benzene Tricarboxylic Acid) Metal-Organic Frameworks.

“…Moreover, QDs as new semiconductor particles in the nanosized scales possess a higher surface area-to-volume ratio than their bulk counterparts, and thus allows for greater photon absorption on the photo-catalyst surface [16]. Furthermore, recombination of the electron-hole pair within the semiconductor particle drastically reduces as particle size decreases [17]. Therefore, the nanoscale semiconductor is expected to have higher photo-catalytic activity than its bulk.…”