| In recent years,the energy crisis and environmental pollution have aroused people's extensive concern,which inspired us to seek clean and sustainable energy.Photocatalytic hydrogen production and photocatalytic degradation are potential ways to solve these problems.Therefore,searching for highly active photocatalysts has become one of the research hotspots at present.?1?In this work,tetra?4-carboxyphenyl?porphyrin?TCPP?was loaded on the surface of Pt/g-C3N4 via adsorption process,and the microstructure and chemical structure of the composite were characterized by high resolution transmission electron microscopy?TEM?,X-ray diffraction?XRD?,X-ray photoelectron spectroscopy?XPS?,Fourier transform infrared spectroscopy?FTIR?,UV-visible diffused reflectance spectroscopy?UV-Vis DRS?and photoluminescence spectroscopy?PL?.Loading TCPP onto Pt/g-C3N4 enhanced the visible-light-driven photocatalytic evolution of H2 from water.The TCPP/Pt/g-C3N4 composite with a TCPP loading of 1 wt%had the highest photoactivity,which was 2.1 times higher than that of Pt/g-C3N4.This improvement can be attributed to enhanced visible light utilization by the TCPP/Pt/g-C3N4 resulting from the strong visible light response of TCPP.In addition,the formed organic heterostructure between TCPP and g-C3N4 with overlapping bad gaps is likely to accelerate the electron transfer and inhibit the recombination of the photogenerated electrons and holes on g-C3N4 to some extent.?2?A TCPP/CN/CdS ternary complexe?TCPPCNCdS?was prepared.The microstructure and chemical structure of the composite were characterized by scanning electron microscope?SEM?,TEM,XRD,XPS,FTIR,UV-Vis DRS and PL.This ternary complex shows considerable photocatalytic hydrogen production activity.?3?A TCPP/CNX/Ag ternary complex?TCPPCNXAg?was prepared.The composite was characterized by SEM,TEM,XRD,FTIR,UV-Vis DRS and PL.The hydrogen production performance of the photocatalytic system including TCPPCNXAg was studied. |
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