Journal
CHEMICAL ENGINEERING JOURNAL
Volume 346, Issue -, Pages 77-84Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.04.017
Keywords
Bimetallic co-catalyst; Gas-phase photocatalysis; Continuous photocatalysis
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Funding
- National Key Research and Development Program of China [2017YFE0102700]
- National Natural Science Foundation of China [51732007, 51372138]
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Combining high-efficient photocatalysts and well-designed photocatalytic reactors is a promising approach to realize the practical photocatalytic degradation of the volatile organic chemicals (VOCs). In this work, the PdAg/AgBr/TiO2 hierarchical nanostructure was synthesized via a hydrothermal approach followed by the photodeposition, ion-exchange, and the photo-reduction processes. The bimetallic Pd-Ag co-catalyst on AgBr/TiO2 composites presented enhanced photocatalytic activity in the photo-degradation of propylene, which was varied with Pd content. The high photocatalytic activity of the hybrid photocatalyst is derived from the high visible-light photocatalytic activity of AgBr and the improved charge separation of the Pd-Ag/AgBr/TiO2 hierarchical nanostructure. Finally, a self-container hydrothermal method was proposed and prepared the Pd-Ag enhanced AgBr/TiO2 hierarchical nanostructured photocatalytic hybrid capillary tubes. A well-designed continuous photocatalytic reactor was integrated by fixing the glass capillary tubes onto a pair of circled glass tubes with a Xe arc lamp in the center of the device. The reactor showed a high degradation efficiency of gaseous propylene over a large range of flow rates. Therefore, it possesses a high potential for the practical application to deal with the VOCs.
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