Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 9, Issue 6, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.106652
Keywords
Iodine vacancy; Z-scheme heterojunction; Hg-0 removal; DFT
Categories
Funding
- National Natural Science Foundation of China [52076126]
- Natural Science Foundation of Shanghai [19ZR1401800]
- Projects of Shanghai Science and Technology Committee [20DZ1205207]
- Key Laboratory of Clean Power Generation and Environmental Protection Technology in Mechanical Industry
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The study synthesized a TiO2/BiOI1-x composite material with iodine vacancy and Z-scheme heterojunction, finding that the synergistic effect of these two components significantly enhanced the photocatalytic activity, leading to efficient removal of elemental mercury.
The novel TiO2/BiOI1-x Z-scheme heterostructure with iodine vacancy was synthesized by calcination method and applied to photocatalytic removal of gas-phase Hg-0. Combining with characterization analysis and DFT calculation results, the existence of iodine vacancy and Z-scheme generated charge-carrier migration paths in the TiO2/BiOI1-x composite were confirmed, and their effects on photocatalytic activity were further discussed. In the TiO2/BiOI1-x composite, the synergistic effect of iodine vacancy and Z-scheme heterojunction improved the migration efficiency of photogenerated charge and retain electrons and holes with high redox capacity, which effectively enhances the photocatalytic activity. The experiment results showed the TiO2/BiOI1-x composite possessed excellent photocatalytic removal efficiency of elemental mercury under influence of the synergistic effect. This study provides a new idea for designing photocatalysts with heterojunction and surface defects to purify environmental pollutants.
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