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Synthesis of the g-C3N4/CdS Nanocomposite with a Chemically Bonded Interface for Enhanced Sunlight-Driven CO2 Photoreduction

The
work, herein, reports a simple approach for the synthesis of
the g-C3N4/CdS nanocomposite. The high pressure NH3 and
H2S, which is created by the polycondensation of thiourea,
processes simultaneously the gas-induced lysis to fracture the carbon
nitride framework, and the sulfidation of adsorbed Cd precursor to
form CdS nanoparticles (NPs) with high crystallinity on the surface
of the modified carbon nitride structure. These processes synchronously
alter the fragmentation mechanism of the carbon nitride framework
and shift the crystal grow orientation of the CdS NPs. Importantly,
they result in the creation of the C–S–Cd bridges that
induce an intimate chemically bonded interface between g-C3N4 and CdS NPs. The heterostructure coupled with this
chemically bonded interface favors effective charge separation and
transfer. The as-prepared nanocomposite photocatalyst exhibits an
efficient sunlight-driven photoreduction of CO2 into CO,
which are superior to those of the g-C3N4 material
and CdS NPs alone, in the presence of the metal–organic complex
as a co-catalyst. CO selectivity is greatly enhanced, as compared
to the g-C3N4 material, indicating the critical
role of CdS NPs in the composite to promote the interaction with the
co-catalyst, thus enhancing the CO2 reduction and decreasing
the side reaction of the H2 evolution.