Preparation of a Leaf-Like BiVO₄-Reduced Graphene Oxide Composite and Its Photocatalytic Activity

Abstract

We prepared a unique leaf-like BiVO4-reduced graphene oxide (BiVO4-rGO) composite with prominent adsorption performance and photocatalytic ability by a single-step method. Multiple characterization results showed that the leaf-like BiVO4with average diameter of about 5 um was well dispersed on the reduced graphene oxide sheet, which enhanced the transportation of photogenerated electrons into BiVO4, thereby leading to efficient separation of photogenerated carriers in the coupled graphene-nanocomposite system. The characterization and experiment results also indicated that the outstanding adsorption ability of such composite was closely associated with the rough surface of the leaf-like BiVO4and doped rGO. The surface photocurrent spectroscopy and transient photocurrent density measurement results demonstrated that the doped rGO enhanced separation efficiency and transfer rate of photogenerated charges. As a result, the BiVO4-rGO exhibited higher photocatalytic capacity toward the degradation of rhodamine B dye under visible-light irradiation compared with pure BiVO4and P25.

Photocatalytic Degradation of Dyes: An Overview

“…Methylene Blue Surface to Volume ratio is responsible [130] BiVO4-rGO Rhodamine B Better than pure BiVO4 and P-25 [131] Flower like N-doped MoS2 Rhodamine B 27 times better than bare MoS2 and 7 times better than P-25 [132] H3PW12O40/SiO2 Rhodamine B under simulated natural light irradiation [133] SrTiO3…”

Harvesting Energy from an Organic Pollutant Model Using a New 3D-Printed Microfluidic Photo Fuel Cell

“…No changes were observed for the Bi 4f (peaks at 164.4 and 159.0 eV with an energy separation of 5.3 eV) and V 2p (at 524.0 and 516.6 eV with an energy separation of 7.4 eV) high-resolution spectra after Pt deposition. This indicates that the bismuth and the vanadium species exist in the trivalent and pentavalent states, respectively. , However, the O 1s showed distinct characteristics, where two oxygen species completely fit the spectrum of pristine BiVO 4 ascribed to adsorbed species (and/or oxygen vacancies) at 532.2 eV and lattice oxygen in BiVO 4 at 529.6 eV (Figure A). After the photoreduction of Pt 4+ on the BiVO 4 surface, a new peak centered at 531.7 eV appears (Figure B), as expected for platinum oxides .…”

Excellent photocatalytic reduction of nitroarenes to aminoarenes by BiVO4 nanoparticles grafted on reduced graphene oxide (rGO/BiVO4)

“…The Bi 4f core level spectrum (Figure B) shows the dominant 4f 7/2 and 4f 5/2 peaks at 159.5 and 164.8 eV characteristic of Bi 3+. The C 1s core level spectrum (Figure B) can be deconvoluted into four components: 284.6, 285.7, 286.9 and 288.3 eV assigned to (C‐C, C=C, C‐H), (C‐OH), (C=O) and (O=C‐OH), respectively . The O 1s core level spectrum (Figure D) can be fitted with three peaks: 530.4, 531.8 and 533.4 eV attributed to O 2− , O=C and O‐C=O, respectively.…”