通过简单的水热及煅烧方法制备了脯氨酸掺杂的g-C3N4纳米片,借助FTIR、XRD、SEM、BET、XPS、UV-vis DRS、PL、电化学工作站等手段对所制备的光催化剂进行结构、形貌、组成及光电性能表征分析.结果表明,脯氨酸的加入可以自主剥离前驱体,制成纳米片状的g-C3N4,增加催化剂的比表面积.此外脯氨酸的引入可以调节催化剂的能带结构,增加可见光吸收,提高光生载流子分离率.在模拟可见光照射下,考察其对罗丹明B (RhB)的光催化降解性能获得了最优掺杂条件.1%脯氨酸掺杂(PCN-1%)的催化剂经过60min可见光照射即可降解99%以上的污染物.降解速率得到显著提升,PCN-1%对RhB的降解速度(0.0271min-1)达到传统体相氮化碳(BCN)降解速率(0.0027min-1)的10.04倍,显著提高了g-C3N4的光催化能力.
Abstract
Proline doped g-C3N4 nanosheets were successfully prepared by a feasible hydrothermal and calcination approach. Properties of the photocatalysts, including structure, morphology, composition and photoelectric characteristics, were systematically analyzed by FTIR, XRD, SEM, BET, XPS, UV-vis DRS, PL, and Electrochemical workstation. The results showed that the addition of proline could autonomously exfoliate the precursors to make nanosheets of g-C3N4 and increase the specific surface area of the catalysts. Furthermore, the energy band structure of the catalysts, visible light absorption ability, and the separation rate photogenerated carriers of as-prepared g-C3N4 were remarkably improved. The photocatalytic performance was investigated by degradation of Rhodamine B under simulated visible light irradiation. The optimal doping conditions was herein obtained. At 1% addition amount of doped proline (PCN-1%), over 99% pollutants could be degraded under 60min irradiation of visible light. The degradation rate of PCN-1% (0.0271min-1) was 10.04 times compared with that of the traditional bulk carbon nitride (BCN, 0.0027min-1), evidencing the notably improved photocatalysis properties of g-C3N4.
关键词
g-C3N4 /
脯氨酸掺杂 /
光催化 /
纳米片
Key words
g-C3N4 /
nanosheets /
photocatalysis /
proline doping
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