Mesoporous Magnetically Recyclable Photocatalysts for Water Treatment

Abstract

Photocatalysis over titanium dioxide is a promising technology for water purification and degradation of emerging contaminants, however, catalyst efficiency and recovery after the photocatalytic reaction are key challenges that have limited the practical deployment of TiO2 in water treatment applications. Herein we report the synthesis of core-shell, superparamagnetic gamma-Fe2O3@SiO2@TiO2 colloidal nanospheres with a mesoporous TiO2 shell, their characterization, and application in photocatalysis. The final surface area of the particles was - 100 m2 g(-1), and their photocatalytic efficiency matched that of P25 TiO2.

Spiky gold shells on magnetic particles for DNA biosensors

“…Millipore water and reagent grade ethanol were used. Silica-coated iron oxide particles were synthesized previously at the University of Waterloo [43].…”

“…Magnetite spheres were synthesized using a previously developed hydrothermal synthesis [43][44][45]. In brief, sodium citrate dihydrate, polyacrylamide (PAM), and Magnetic separation of samples in all steps was performed using either a small neodymium magnet or a rare earth homogenous magnetic separator (Sepmag Lab 2142, inner bore diameter 31 mm, radial magnetic field gradient 45 T/m).…”

“…Silica coating was done in a second step [43]. In brief, the magnetite particle powder was dispersed into a solution of EtOH and Millipore deionized water by probe sonication.…”

Magnetically Recyclable Nanomaterials for Water Treatment

“…Furthermore, these recyclable photocatalysts are demonstrated to exhibit similar activity to P25, a benchmark TiO 2 formulation. This section is reproduced from [41].…”

Emerging Pollutants – Part II: Treatment

“…also synthesized nano-scaled tungsten oxide (WO 3 ) coated evenly on ZnO nanorods (ZNRs) to create robust WO 3 -ZNR nanocomposites with a red-shifted adsorption spectrum. These nanocomposites showed superior photocatalytic activity in the degradation of resorcinol over pure ZNRs, as well as successful degradation of other endocrine disrupting chemicals Leshuk et al (2013). synthesized and characterized core-shell, super-paramagnetic γ-Fe 2 O 3 @SiO 2 @TiO 2 colloidal nanospheres with mesophorous TiO 2 shells for use in photocatalysis for water purification.…”