Phosphorus-doped nitrogen-deficient graphitic phase carbon nitride (g-C3N4) was synthesized by a thermal polymerization combined with rapid high-temperature method using dicyandiamide and thiourea as mixed precursors and (NH4)2HPO4 as the phosphorus source.The effects of precursor ratios,phosphorus doping amount,and high-temperature treatment temperature on the structure and photocatalytic activity of g-C3N4 were investigated.It was shown that the sample with thiourea to dicyandiamide mass ratio of 6∶4,a phosphorus doping amount of 5%,and a high-temperature treatment temperature of 700℃ exhibited the optimal photocatalytic performance.Its degradation efficiency for methylene blue at 60 min was 96.15%,which was 1.24 times and 1.5 times higher than that of DS60-5% and DS60%,respectively.The analytical test results showed that P-doping and fast high-temperature treatment reduced the band gap value of g-C3N4 and broadened the absorption range of visible light.Meanwhile,nitrogen defects were introduced into the g-C3N4 structure,prompting the effective separation of photogenerated carriers.
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基金资助
国家自然科学基金(31960297和31960296);云南省农业基础研究联合专项(202301BD070001-079);高等学校学科创新引智计划资助(D21027)
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