3 years ago

Heterogeneous catalysis of ozone using ordered mesoporous Fe3O4 for degradation of atrazine

Heterogeneous catalysis of ozone using ordered mesoporous Fe3O4 for degradation of atrazine
Ordered mesoporous Fe3O4 catalyst was successfully fabricated using KIT-6 as the hard template through a nanocasting route and innovatively investigated as a heterogeneous ozonation catalyst. The morphology and physico-chemical properties of as-prepared catalysts were characterized by X-way diffraction, Fourier transform infrared, transmission electron microscopy, X-ray photoelectron spectroscopy and N2 adsorption-desorption techniques. Results showed that the surface area and average pore size of mesoporous Fe3O4 were 154.2m2 g−1 and 6.2nm, respectively. The mesoporous Fe3O4 catalyst presented superior catalytic activity for removing atrazine (ATZ) during ozonation compared to conventional Fe3O4 nanoparticles. The contribution of homogeneous ozonation reaction catalyzed by leaching irons was negligible, suggesting that the degradation of ATZ was mainly dominated by heterogeneous reaction catalyzed by mesoporous Fe3O4. Moreover, the removal rate of ATZ increased with the increase of catalyst dosage and solution pH. Based on the results of XPS analysis and radical scavenging test, a plausible mechanism was proposed. The redox cycles of Fe2+/Fe3+ was responsible for hydroxyl radical (OH ) generation and OH dominantly contributed to the degradation of ATZ in this study. Finally, the possible transformation pathways of ATZ degradation were proposed and the toxicity of degradation products was evaluated. The results demonstrated that ordered mesoporous Fe3O4 is a promising catalyst for ozonation process, especially treating water polluted by ozone-resistant contaminants.

Publisher URL: www.sciencedirect.com/science

DOI: S1385894717312305

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.