4 years ago

Synthesis of Z-scheme Ag2CrO4/Ag/g-C3N4 composite with enhanced visible-light photocatalytic activity for 2,4-dichlorophenol degradation

Synthesis of Z-scheme Ag2CrO4/Ag/g-C3N4 composite with enhanced visible-light photocatalytic activity for 2,4-dichlorophenol degradation
Designing and construction of highly efficient Z-scheme photocatalytic systems has received growing attention because of their unique advantages of excellent photogenerated carrier separation ability, complementary light absorption property and high redox capacities, which made them highly promising in refractory organic pollutants removing in the field of wastewater treatment. In this study, a narrow band gap Ag-based semiconductor Ag2CrO4 with broad visible light response range (λ<688nm), sufficient oxidation capability of photogenerated hole and excellent photogenerated carrier separation ability was chosen to couple with g-C3N4 for enhancing the photocatalytic activity of g-C3N4. A series of Z-scheme Ag2CrO4/Ag/g-C3N4 composites were synthesized via facile in-situ growth strategy and photoreduction approach, and their photocatalytic performances for 2,4-dichlorophenol (2,4-DCP) degradation were evaluated under visible light irradiation (λ>420nm). Benefiting from the broadband light utilization of the composite and efficient separation and transfer of photogenerated carriers, as well as the sufficient redox capacities of the photogenerated electrons and holes, the as-synthesized composites displayed remarkably enhanced photocatalytic activity for 2,4-DCP degradation, which was about 5.2 times as high as that over individual g-C3N4. Meanwhile, mechanism study through the active species trapping, electron spin resonance (ESR) experiments and band edge position estimation analysis provided evidences that the possible enhancing photocatalytic mechanism was ascribed to the Z-scheme. This work will shed light on design of other efficient g-C3N4-based Z-scheme photocatalytic systems for application in environmental remediation.

Publisher URL: www.sciencedirect.com/science

DOI: S0926337317307257

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.