LAUSR.org creates dashboard-style pages of related content for over 1.5 million academic articles. Sign Up to like articles & get recommendations!

Tailored synthesis of anatase–brookite heterojunction photocatalysts for degradation of cylindrospermopsin under UV–Vis light

Photo by ale_s_bianchi from unsplash

Abstract Anatase–brookite heterojunction TiO2 (ABH) photocatalysts were purposefully tailored by introducing different glycine concentrations through hydrothermal treatment at 200 °C for 20 h. In the absence of glycine, pure anatase and brookite… Click to show full abstract

Abstract Anatase–brookite heterojunction TiO2 (ABH) photocatalysts were purposefully tailored by introducing different glycine concentrations through hydrothermal treatment at 200 °C for 20 h. In the absence of glycine, pure anatase and brookite phases were selectively prepared via simply adjusting the initial pH value with NH4OH or NaOH. The as-synthesized photocatalysts were characterized with X-ray diffraction (XRD), Raman spectroscopy, UV–Vis diffuse reflectance spectra (DRS), photoluminescence (PL), surface area measurements, Fourier transform infrared spectroscopy (FT-IR) and field emission-scanning electron microscopy (FE-SEM). The XRD revealed that brookite content decreased in ABH samples with glycine concentration increased. The prepared TiO2 nanoparticles have mesostructure with large surface area values ranging from 27.9 to 62.3 m2 g−1. SEM images showed spindle-like brookite structure and rod-like brookite mixed with small anatase particle obtained in the absence and presence of glycine, respectively. The electron–hole recombination efficiency in ABH photocatalysts was much lower than that in single phase TiO2. The absorption edges of ABH samples were red-shifted in the range of 250–400 nm. The activities of as-prepared TiO2 photocatalysts were evaluated for the degradation of cylindrospermopsin (CYN) under UV–Vis light. Complete CYN degradation (100%) from aqueous solution with initial rate of 175 × 10−3 μM min−1 was achieved under UV–Vis light irradiation within 15 min. This was attributed to its unique crystal phase composition, mesoporous structure and high surface area.

Keywords: vis light; degradation cylindrospermopsin; brookite heterojunction; anatase; spectroscopy; anatase brookite

Journal Title: Chemical Engineering Journal
Year Published: 2017

Link to full text (if available)


Share on Social Media:                               Sign Up to like & get
recommendations!

Related content

More Information              News              Social Media              Video              Recommended



                Click one of the above tabs to view related content.