Electrostatic Self-Assembled Synthesis of Amorphous/Crystalline g-C(3)N(4) Homo-Junction for Efficient Photocatalytic H(2) Production with Simultaneous Antibiotic Degradation

g-C(3)N(4) has been regarded as a promising photocatalyst for photo-reforming antibiotics for H(2) production but still suffers from its high charge recombination, which has been proven to be solvable by constructing a g-C(3)N(4) homo-junction. However, those reported methods based on uncontrollable calcination for preparing a g-C(3)N(4) homo-junction are difficult to reproduce. Herein, an amorphous/crystalline g-C(3)N(4) homo-junction (ACN/CCN) was successfully synthesized via the electrostatic self-assembly attachment of negatively charged crystalline g-C(3)N(4) nanorods (CCN) on positively charged amorphous g-C(3)N(4) sheets (ACN). All the ACN/CCN samples displayed much higher photo-reforming of antibiotics for H(2) production ability than that of pristine ACN and CCN. In particular, ACN/CCN-2 with the optimal ratio exhibited the best photocatalytic performance, with a H(2) evolution rate of 162.5 μmol·g(−1)·h(−1) and simultaneous consecutive ciprofloxacin (CIP) degradation under light irradiation for 4 h. The UV–vis diffuse reflectance spectra (DRS), photoluminescence (PL), and electrochemical results revealed that a homo-junction is formed in ACN/CCN due to the difference in the band arrangement of ACN and CCN, which effectively suppressed the charge recombination and then led to those above significantly enhanced photocatalytic activity. Moreover, H(2) was generated from the water reduction reaction with a photogenerated electron (e(−)), and CIP was degraded via a photogenerated hole (h(+)). ACN/CCN exhibited adequate photostability and reusability for photocatalytic H(2) production with simultaneous CIP degradation. This work provides a new idea for rationally designing and preparing homo-junction photocatalysts to achieve the dual purpose of chemical energy production and environmental treatment.