Fullerenes possess an appropriate bandgap,allowing for rapid photo-induced charge separation and relatively slow charge recombination,making it an excellent material for enhancing semiconductor photocatalytic activity.In this study,carboxyl-functionalized derivatives of fullerene,C60-(COOH),were synthesized on the surface of fullerene through the Prato reaction.The synthesized product was characterized using visible-near-infrared spectroscopy,Fourier-transform infrared spectroscopy(FTIR),and mass spectrometry,confirming the formation of 1 to 4 addition carboxylation derivatives.C60/g-C3N4 and C60-(COOH)/g-C3N4 composite materials were prepared using a liquid-phase precipitation method.The properties of the composite materials were characterized using X-ray diffraction and UV-visible diffuse reflectance spectroscopy.The synthesized composite materials were tested for photocatalytic degradation of Rhodamine B under visible light.The results showed that the C60-(COOH)/g-C3N4 composite exhibited the highest photocatalytic activity,with a degradation rate 1.3 times higher than that of C60/g-C3N4 and 1.6 times higher than that of g-C3N4.Additionally,recycling experiments were conducted on g-C3N4,C60-(COOH)/g-C3N4,and C60/g-C3N4 composite materials.The experimental results showed that the C60-(COOH)/g-C3N4 composite material still achieved 49.4％degradation of Rhodamine B,which was 1.2 times higher than that of g-C3N4 and 1.7 times higher than that of C60/g-C3N4.The above experimental results demonstrate that carboxyl-functionalized fullerene is a more efficient enhancer of photocatalytic activity compared to pristine fullerene.The semiconductor composite material prepared with it shows promise as an effective photocatalyst for the degradation of organic pollutants.
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