Synthesis of N-Doped Magnetic WO3-x@Mesoporous Carbon Using a Diatom Template and Plasma Modification: Visible-Light-Driven Photocatalytic Activities

Synthesis of three-dimensional photocatalysts offers great potential for chemical conversion and hydrogen generation as appropriate solutions for environmental protection and energy shortage challenges. In this study, the magnetic WO3-x@ mesoporous carbon (M-WO3-x@MC) was synthesized through the evaporation-induced self-assembly method applying diatom frustules as a natural template. Then, plasma modification was used to prepare the N-doped M-WO3-x@MC (NM-WO3-x@MC) with enhanced photocatalytic activity and durable performance. The WO3-x was embedded in the conductive MC, which was also partially reduced by the carbon precursor within the heat-treatment procedure. The obtained M-WO3-x@MC was treated by the plasma under an N-2 atmosphere for the production of the final photocatalyst containing both the N-doped WO3-x and MC. As a result, the NM-WO3-x@MC had larger surface area (208.4 m(2) g(-1)), narrower band gap (2.3 eV), more visible light harvesting, and confined electron-hole pairs recombination. The H-2 generation rates of net WO3 nanorods and NM-WO3-x@MC nanocomposite were estimated as 532 and 2765 mu mol g(-1) h(-1), respectively. Additionally, more than 90% of antibiotics (cephalexin, cefazolin and cephradine) degradation and 76% of total organic carbon elimination were obtained after 120 and 240 min of photocatalytic process under visible light irradiation. Eventually, more than eight intermediates were detected for each antibiotic degradation using the gas chromatography-mass spectrometer method, and based on the obtained results, the possible degradation pathways were suggested.

Automated summary

The synthesis of three-dimensional photocatalysts shows potential for chemical conversion and hydrogen generation for environmental protection and energy shortage challenges. In this study, a magnetic WO3-x@mesoporous carbon catalyst was synthesized using diatom frustules as a template, followed by plasma modification to enhance its photocatalytic activity. The modified catalyst showed improved surface area, visible light harvesting, and higher hydrogen generation rates compared to the untreated WO3 nanorods.