Abstract
Bifunctional photocatalysts, namely, magnetic TiO2 composites (TiO2/SiO2/Fe3O4, TSM), were prepared and used to degrade dimethyl phthalate (DMP), which is suspected of having endocrine-disrupting effects and a high potential to threaten aquatic environments. The main factor affecting the deposition of titania on the magnetic carrier (SiO2/Fe3O4) for the preparation of TSM composites investigated in this study was the water-to-titanium ratio (WTR) in the range of 60–250. The TSM composites were characterized by SQUID, TEM, XPS, XRD, UV absorption, and zeta potential analysis. The effects of the dosage of TSM composite and solution pH on the photodegradation of DMP were also investigated. The best water-to-titanium ratio for the synthesis of the thickest film of TiO2 on the magnetic carrier in a homogeneous nucleation system was determined to be WTR = 130. The obtained TSM composites were superparamagnetic and mainly exhibited the crystalline structure of the anatase phase. The energy gap and pHPZC of TSM13...
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