Synergistic
Photocatalytic Decomposition of a Volatile Organic Compound Mixture:
High Efficiency, Reaction Mechanism, and Long-Term Stability
Posted on 2020-06-18 - 15:04
Photocatalysis technology
has been extensively
applied for the treatment of volatile organic compounds (VOCs) commonly
based on the performance evaluation against a single target component.
However, in real situations, a multitude of VOCs are present simultaneously.
Other than the studies with photocatalyst design, the mechanisms of
mutual effects between different VOCs and the complex reactions at
the pollutants/photocatalyst interface are highly delicate to seek
for the optimal routes for their decomposition and mineralization.
In this work, a comprehensive analysis was made for the destruction
of the formaldehyde (CH2O) and toluene (C7H8) mixture. The synergistic efficiency in the decomposition
of the CH2O/C7H8 mixture was first
established relative to its individual component. The photocatalytic
efficiency was maintained for 8 h on the SnO2 photocatalyst,
and the durability of the proposed photocatalyst was stable enough
even after 30 days of exposure to air. Direct evidence for the synergistic
effect on the destruction of the CH2O/C7H8 mixture composition is hypothesized. Most likely, the addition
of CH2O into C7H8 turns out to be
the rate-determining step in the ring-opening process to promote the
decomposition reaction rates for the mixture. It was revealed by gas
chromatography–mass spectrometry and density functional theory
calculations that the CH2O addition leads to the generation
of o-tolualdehyde as key intermediates, which elevated
the adsorption and activation of the aromatic ring. This work may
offer better insights into the practicality of photocatalysis technology
in decomposition of key gaseous pollutants by endowing the “conventional”
SnO2 photocatalyst with novel applications.
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Li, Jieyuan; Chen, Ruimin; Cui, Wen; Dong, Xing’an; Wang, Hong; Kim, Ki-Hyun; et al. (2020). Synergistic
Photocatalytic Decomposition of a Volatile Organic Compound Mixture:
High Efficiency, Reaction Mechanism, and Long-Term Stability. ACS Publications. Collection. https://doi.org/10.1021/acscatal.0c00693