**4. Conclusions**

In summary, the BiVO4 nanoparticles/RGO, BiVO4 nanotubes/RGO and BiVO4 nanosheets/RGO hybrids were prepared and the photocatalytic performance was evaluated. The morphology, chemical structures and photocatalytic performance of the as-prepared samples are studied through a series of characterization. Compared to 0D/2D and 1D/2D nanocomposites, 2D/2D BiVO4 nanosheets/RGO with two-dimensional interface exhibits higher photoactivity. That can be attributed to a stronger electronic and physical coupling effect between BiVO4 nanosheets and graphene nanosheets, which allows for the prolonged lifetime and effective separation of electrons and holes. The 2D-2D heterojunction interface opens a new window for exploiting a visible light photocatalytic system with well-defined nanohybrids to purify the polluted environment.

**Supplementary Materials:** The following are available online at http://www.mdpi.com/2079-4991/9/6/907/s1, the details of preparation of BiVO4 nanoparticles and BiVO4 nanoparticles/RGO, Figure S1: Atomic force microcopy images of the 2D BiVO4 nanosheets, Figure S2: Thermo gravimetric analysis (TGA) of the BiVO4/RGO composites, Figure S3: XRD patterns of the prepared graphene oxide (GO), Figure S4: Raman spectra of BiVO4 and BiVO4/RGO composites, Figure S5: HPLC chromatograms of acetaminophen standard sample, Figure S6: The adsorptive performance of acetaminophen over the BiVO4 and BiVO4/RGO composites without visible light irradiation, Table S1. The pseudo-first order kinetic equation and the rate constant (k) of BiVO4 and BiVO4/RGO composites, Figure S7: Photocatalytic degradation of RhB over photocatalysts under different pH conditions: (a) BiVO4 nanosheet/RGO; (b) BiVO4 nanotube/RGO;(c) BiVO4 nanoparticle/RGO, Figure S8: Free radical inhibition experiment of BiVO4 samples: (a) BiVO4 nanoparticles; (b) BiVO4 nanotubes; (c) BiVO4 nanosheets, Figure S9: Electron spin resonance spectra of radical in BiVO4 samples under visible light: (a) DMPO-O2•<sup>−</sup>, (b) h+ and (c) DMPO-•OH, Figure S10: PL spectra of BiVO4 and BiVO4/RGO samples.

**Author Contributions:** Conceptualization, J.S. and X.W.; performed the experiments, C.W.; analyzed the data, J.S., H.S. and D.L.; writing-original draft preparation, J.S. and X.W.; writing—review and editing, T.S. and X.W.; funding acquisition, R.Z. All authors read and approved the final version of the manuscript.

**Funding:** This research was funded by the National Nature Science Foundation of China (No. 21507067), Doctoral Found for Cooperation Projects of Qilu University of Technology (Shandong Academy of Sciences) (No.2017BSHZ019) and International Cooperation Research Special Funds Project of Qilu University of Technology (Shandong Academy of Sciences) (No. QLUTGJHZ2018004).

**Conflicts of Interest:** The authors declare no conflict of interest.
