g-C3N4的硫酸铵-尿素混合法制备及其可见光催化性能
Preparation of g-C3N4 by ammonium sulfate-urea mixed method and its visible light photocatalytic performance
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摘要: 以尿素（CON2H4）和不同质量的硫酸铵为前驱体，使用高温煅烧法制备得到产率和可见光催化活性都较高的石墨相氮化碳（g-C3N4）.采用XRD、DRS、SEM和PL等方法对其理化性质进行表征，以罗丹明B（RhB）和苯酚为模拟污染物，考察了g-C3N4在可见光下的催化活性，通过活性物种捕捉实验推测出了RhB的降解机理.结果表明，与只使用尿素相比，硫酸铵和尿素混合作为前驱体制备g-C3N4，不仅产率提高2.2倍，而且也保持了较高的可见光催化活性；其中当硫酸铵的添加量为3.00 g时，制备的g-C3N4对RhB的降解速率最快，在可见光下照射2 h，对RhB的降解率达到97.42%，与单独使用尿素制得的g-C3N4的可见光催化活性基本持平；硫酸铵的添加，使得g-C3N4的制备成本降低了45%；活性物种捕捉实验结果证明硫酸铵的引入改变了g-C3N4对RhB的降解路径.Abstract: Using urea (CON2H4) and ammonium sulfate of different amounts as precursors,graphite phase carbon nitride (g-C3N4) with high yield and visible light catalytic activity was synthesized by high-temperature calcination method. The physical and chemical properties of as-prepared samples were characterized by X-ray diffraction(XRD),UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS),scanning electron microscopy(SEM),and photoluminescence spectroscopy(PL) respectively. The photocatalytic performance of g-C3N4 was evaluated by photocatalytic degradation rates of Rhodamine B (RhB) and phenol aqueous solution under the irradiation of visible light. The degradation mechanism of RhB was proposed according to the test of active species catching. The results showed that,compared with g-C3N4 prepared by urea alone,the g-C3N4 synthesized by employing ammonium sulfate combined with urea as precursors not only increased the yield by 2.2 times but also maintained higher catalytic activity under visible light irradiation. In addition,there was an optimal amount of ammonium sulfate for the g-C3N4 photocatalyst. When the dosage of ammonium sulfate was 3.00 g,the obtained g-C3N4 showed the highest photocatalytic performance, for example,the degradation of RhB reached 97.42% when the irradiation time was 120 min. The photocatalytic performance was basically the same as the visible light photocatalytic activity of g-C3N4 prepared by urea alone. The addition of ammonium sulfate reduced the preparation cost of g-C3N4 by 45%. The results obtained from the test of active species catching proved that the introduction of ammonium sulfate had changed the degradation pathway of RhB when g-C3N4 was used as the catalyst.
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Key words:
- g-C3N4 /
- visible light catalysis /
- ammonium sulfate /
- urea /
- rhodamine B /
- phenol
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