Enhancing the degradation efficiency of OPs under visible light by an
integrated cascade photo-biocatalyst
Abstract
Photo-enzymatic integrated nanocatalyst which combined biocompatible
photocatalytic carrier and OPH is designed to remove OPs. H-TiO2
microsphere is prepared using wrinkled SiO2 as template. Then, Au
nanoparticles are loaded on the H-TiO2 to obtain Au-H-TiO2
heterojunction microsphere, which achieved effective use of visible
light based on the SPR. The characterization results of Au-H-TiO2 prove
that the Au-H-TiO2 has large specific surface area (226.19 m2/g) and
narrow band gap (2.68 eV). Adsorption methods are used to prepare
OPH@Au-H-TiO2 by immobilizing OPH molecules. The obtained OPH@Au-H-TiO2
can degrade methyl parathion to p-NP by OPH. Then the p-NP is degraded
to hydroquinone with low toxicity using Au-H-TiO2. After 2.5 h, methyl
parathion is completely degraded, and about 82.64% of the generated
p-NP is further degraded into hydroquinone. The fabricated OPH@Au-H-TiO2
has excellent catalytic activity and cycle stability, which is ascribed
to the photo-enzyme synergic catalytic effect.