Preparation of novel flower-like BiVO4 /Bi2 Ti2 O7 /Fe3 O4 for simultaneous removal of tetracycline and Cu2+ : Adsorption and photocatalytic mechanisms

Journal of Colloid and Interface Science
Dadao WangGuoxin Chen

Abstract

To improve the visible light utilization and adsorption capacity for combined pollutants (Tetracycline and Cu2+), novel flower-like BiVO4/Bi2Ti2O7/Fe3O4 composite has been successfully synthesized for the first time via a simple two-step process, surfactant-free hydrothermal route and solvothermal method. The crystal structures, chemical compositions, morphologies, optical and photocatalytic properties of the as-prepared samples were characterized by the techniques of XRD, XPS, SEM, HRTEM, BET, UV-vis DRS, and Photocurrent tests (PT). The synthetic sample with 4:1:20 (S5) mass ratio of BiVO4/Bi2Ti2O7/Fe3O4 possessed the highest adsorption capacity and photocatalytic performance simultaneously in all of the as-prepared composites. Adsorption experiment (model 1 and model 2) suggested that there was not only competitive adsorption but also synergistic adsorption mechanisms between Cu2+ and TC. Compared to pure BiVO4, and BiVO4/Bi2Ti2O7, BiVO4/Bi2Ti2O7/Fe3O4 displayed more superior photodegradation efficiency with 97.22% removal of TC (10 mg/L) in 60 min, where the optimal conditions were catalyst dosage 1.00 g/L and initial pH at 6.0. In addition, radical trapping experiments revealed that the photo-induced active species superox...Continue Reading

Citations

Dec 18, 2019·Environmental Science and Pollution Research International·Ying ZhuMaria Sahibzada
Aug 21, 2020·Environmental Science and Pollution Research International·Morteza KhanmohammadiFarhad Rahmani

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