Preparation And Photocatalytic Properties Of G-C₃N₄ Based Composites

Graphite-like carbon nitride/bismuth niobite@silver iodide（g-C₃N₄/BiNbO₄@AgI）and graphitic-like carbon nitride/tin sulfide@silver iodide（g-C₃N₄/SnS₂@AgI）high-efficiency composite visible light photocatalytic materials were prepared.In order to determine the structure and morphology of each sample,a variety of characterization methods were used,including the use of field emission scanning electron microscopy（FE-SEM）,X-ray diffraction（XRD）,Fourier transform infrared spectroscopy（FT-IR）,etc.The catalysts were found to be well dispersed and free of impurities by energy dispersive analysis（EDS）and X-ray photoelectron spectroscopy（XPS）.In addition,in order to accurately speculate the possible photocatalytic degradation mechanism of the ternary composite catalyst,the ultraviolet-visible diffuse reflectance spectrum（UV-Vis DRS）of the catalyst was measured,and electrochemical experiments and active radical capture experiments were carried out on the catalyst.The morphology,structure,and composition of g-C₃N₄ into BiNbO₄,AgI and SnS₂ catalysts were investigated on the photocatalytic activity and the synergistic effect of ternary heterojunction.Graphite-like carbon nitride/bismuth niobite@silver iodide（g-C₃N₄/BiNbO₄@AgI）ternary composite photocatalysts were prepared by in-situ growth method.Through the catalytic degradation of rhodamine B（RhB）under visible light conditions,it was found that the g-C₃N₄/BiNbO₄@AgI ternary composite catalyst with a content of 30?t%had the best effect in the photocatalytic degradation experiment.In addition,the follow-up experiments also proved that the 30?t%g-C₃N₄/BiNb O₄@AgI ternary composite photocatalyst showed excellent stability compared with other contents.Fluorescence tests and electrochemical tests also show that the separation efficiency of photogenerated electron and hole pairs in the 30?t%g-C₃N₄/BiNbO₄@AgI ternary composite catalyst is much higher than that of pure g-C₃N₄ without any substance doping during the photocatalytic reaction.and binary and ternary photocatalysts with different contents.Graphite-like carbon nitride/tin sulfide@silver iodide（g-C₃N₄/SnS₂@AgI）ternary composite photocatalyst was prepared by chemical impregnation method.The catalyst was successfully prepared by characterization test.Through visible light degradation of rhodamine B,it can be found that when g-C₃N₄ is doped with SnS₂ and AgI,the ternary composite photocatalyst has a high photocatalytic degradation efficiency that this single g-C₃N₄ does not have,and its photocatalytic ability is stronger.The subsequent cycling experiments showed that g-C₃N₄/SnS₂@AgI exhibited good stability.From this,it is speculated that the three components coordinate with each other.The experimental results show that the introduction of BiNbO₄ and AgI or the introduction of SnS₂ and AgI into the g-C₃N₄ to form a ternary heterojunction can significantly accelerate the separation rate of photogenerated electron-hole pairs,which can improve the photocatalytic degradation of organic compounds under visible light conditions.Dye efficiency.Both g-C₃N₄/BiNbO₄@AgI and g-C₃N₄/SnS₂@Ag I catalysts have promising photocatalytic prospects.