CuO/g-C3N4活化过二硫酸盐降解甲基橙

采用水热-煅烧法合成了CuO/g-C₃N₄催化剂,利用X射线衍射仪、扫描电镜、红外吸收光谱和X射线能谱对其基本性能进行表征,进一步研究了不同参数下CuO/g-C₃N₄活化过二硫酸盐(PDS)体系对有机污染物(甲基橙,MO)的去除效果。活化实验结果表明:CuO/g-C₃N₄对活化PDS降解MO具有明显效果。优化实验结果表明:在催化剂的水热时间为8 h,CuO复合比为10%,反应体系中催化剂初始浓度为1.00 g/L,PDS初始浓度为4 mmol/L,pH=3的条件下,30 min内MO的降解率高达99.20%。机理分析表明催化剂表面的硫酸根自由基(SO₄-·)和羟基自由基(·OH)是降解MO的主要活性物质,并且有少量超氧自由基(·O₂-)参与其中。对该催化剂进行5次重复实验后,活化PDS对MO降解率仍保持在90%以上,表明该催化剂有较好的稳定性。

DEGRADATION OF METHYL ORANGE BY CuO/g-C3N4 ACTIVATED PEROXODISULFATE

In this paper, the CuO/g-C₃N₄ was synthesized by the hydrothermal-calcination method, and its basic properties were characterized by X-ray diffractometer, scanning electron microscope, infrared absorption spectroscopy and X-ray energy spectroscopy. Under different parameters, CuO/g-C₃N₄ activated peroxodisulfate (PDS) system to remove organic pollutants (methyl orange, MO). The results of activation experiments show that CuO/g-C₃N₄ has a significant effect on activating PDS and degrading MO. Through the optimization experiment, it can be seen that under the conditions of 8 h of hydrothermal time of catalyst, 10% of CuO composite ratio, initial concentration of catalyst in the reaction system of 1.00 g/L, initial concentration of PDS of 4 mmol/L and pH=3, the degradation rate of internal MO is as high as 99.20% in 30min. Further mechanism exploration verified that sulfate radicals (SO₄-·) and hydroxyl radicals (·OH) on the surface of the catalyst are the main active substances that degrade MO, and a small amount of superoxide radicals (·O₂-) participate in them. The catalyst was repeated 5 times, and the degradation rate of MO remained above 90% after activating PDS, indicating that the catalyst had a good stability.