Controllable construction of a three-dimensional spherical LaFeO3/Bi2O3 heterojunction with enhanced photocatalytic ability for tetracycline degradation
Source abstract
Abstract
A novel three-dimensional spherical LaFaO3/Bi2O3 heterojunction was successfully constructed through a two-step synthesis, which included a biological template method and hydrothermal synthesis. Because of the addition of different quantities of LaFaO3, the as-prepared LaFaO3/Bi2O3 composite showed different morphological structures, excitation energies, charge separation efficiencies, and degrees of photocatalytic performance. With the change in the amount of LaFaO3 added, the morphology of the LaFaO3/Bi2O3 complex changed from irregular clusters to a regular spherical structure. When the molar doping ratio of LaFaO3/Bi2O3 was 1:2, it exhibited a near-perfect 3D spherical structure with external pyknotic grooves. The results of electrochemical impedance spectroscopy indicated that the 1:2 LaFeO3/Bi2O3 catalyst exhibited the optimal charge separation efficiency. The bandgap of the prepared LaFaO3/Bi2O3 composite changed from 1.95 eV (1:2) to 2.32 eV (3:4), which were lower than that of the Bi2O3 template (2.81 eV). The 3D-spherical LaFaO3/Bi2O3 catalyst almost completely removed 50 mg L−1 of tetracycline within 90 min. Electron spin resonance and radical trapping experiments revealed that radicals were the main oxidants in the photocatalytic reaction. The construction of a 3D floral spherically structured semiconductor composite photocatalyst improved the further degradation of tetracycline.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Ga2O3 and related materials · Gas Sensing Nanomaterials and Sensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (61)
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