| Summary: | There are many reports on g-C<sub>3</sub>N<sub>4</sub> nanosheet and BiOCl nanosheet, but few studies on other morphologies of g-C<sub>3</sub>N<sub>4</sub> and BiOCl. Herein, a g-C<sub>3</sub>N<sub>4</sub> nanoball/BiOCl nanotube heterojunction prepared by a simple one-step acetonitrile solvothermal method is reported. The XRD results prove that the g-C<sub>3</sub>N<sub>4</sub>/BiOCl composites can be prepared in one step. SEM results revealed that the g-C<sub>3</sub>N<sub>4</sub> was spherical and the BiOCl was tubular. The HRTEM results indicate that g-C<sub>3</sub>N<sub>4</sub> has an amorphous structure and that the (100) crystal plane of BiOCl borders the g-C<sub>3</sub>N<sub>4</sub>. Spherical g-C<sub>3</sub>N<sub>4</sub> has a narrow band gap (approximately 1.94 eV), and the band gap of g-C<sub>3</sub>N<sub>4</sub>/BiOCl after modification was also narrow. When the BiOCl accounted for 30% of the g-C<sub>3</sub>N<sub>4</sub>/BiOCl by mass, the quasi-primary reaction rate constant of RhB degradation was 45 times that of g-C<sub>3</sub>N<sub>4</sub>. This successful preparation method for optimizing g-C<sub>3</sub>N<sub>4</sub> involving simple one-step template-free synthesis may be adopted for the preparation of diverse-shapes and high-performance nanomaterials in the future.
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