高活性碳球修饰g-C_3N_4的制备及光催化性能

Synthesis of Carbon Ball Modified g-C_3N_4 for Improved Photocatalytic Activity

以葡萄糖为原料,采用水热法制备碳球,并采用湿化学法制备了碳球修饰的g-C_3N_4.其光催化降解2,4-二氯苯酚和光催化水产氢性能的测试结果表明,适量碳球的修饰可提高g-C_3N_4光催化降解2,4-二氯苯酚和光催化水产氢的活性.表面光电压谱、光致发光谱和光电化学测试结果表明,碳球修饰提高g-C_3N_4光催化活性的机制在于修饰在g-C_3N_4表面的碳球具有较好的导电性,可促进g-C_3N_4光生电子的转移,从而改善g-C_3N_4光生载流子的分离.

Carbon balls were prepared by hydrothermal method using glucose as the raw material,and the carbon ball modified g-C3N4 samples were synthesized by simple wet chemical method. The results showed that the photocatalytic activities of g-C3N4 were improved after being modified by appropriate amount of carbon balls for both degradating 2,4-dichlorophenol and splitting water. And based on the results of steady-state surface photovoltage spectroscopy, photoluminescence spectroscopy, I-V curve and electrochemical impedance spectrometry,it is revealed that the mechanism of improved photocatalytic activity is that carbon balls promote the photogenerated electron transfer of g-C3N4,thereby improving the separation of the photogenerated carriers.