Journal
CHEMICAL ENGINEERING JOURNAL
Volume 426, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131585
Keywords
Multi charge transport channels; Rational design; Composite photocatalyst; DFT calculation; Sulfamethoxazole
Categories
Funding
- National Key Plan for Research and Development of China [2016YFC0502203]
- Natural Science Foun-dation of China [51979081]
- Fundamental Research Funds for the Central Universities [B200202103]
- National Science Funds for Creative Research Groups of China [51421006]
- PAPD
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This study successfully constructed a La2Ti2O7/g-C3N4/AgI photocatalyst with separated heterojunctions, providing more charge transfer channels and reaction sites, leading to significantly enhanced photodegradation performance for sulfamethoxazole. The study also identified the vulnerable atoms and main degradation pathways of SMZ, offering new insights for the rational design/development of multicomponent photocatalysts for treating emerging pollutants in waters.
Rational design of highly efficient multi-heterojunction photocatalyst with separated charge transfer channels still remains a challenge. Herein, a novel La2Ti2O7/g-C3N4/AgI photocatalyst is constructed via a facile electrostatic self-assembly plus selective deposition-precipitation method. The results demonstrate that the spatially isolated La2Ti2O7 and AgI are both decorated tightly on g-C3N4 nanosheets and form separated heterojunctions, which provide much more separated charge transfer channels and surface reaction sites. Therefore, the samples exhibit remarkably boosted photodegradation performance for sulfamethoxazole (SMZ). DFT results indicate that the atoms with the most positive and negative value of condensed dual descriptors (CDD) are the mostly vulnerable to reactive species. Aromatic amine oxidation, the cleavage of sulfonamide bond and hydroxylation of aromatic rings are mainly SMZ degradation pathways. This study provides a new insight for the guideline of rational design/development of new multicomponent photocatalysts for potential application on treatment of emerging pollutants in waters.
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