Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
College of Ecology and Environment, Zhengzhou University, Zhengzhou, Henan 450001, PR China.
J Colloid Interface Sci. 2022 Oct 15;624:338-347. doi: 10.1016/j.jcis.2022.05.130. Epub 2022 May 25.
Rod-like carbon nitrides synthesized by calcinating supramolecular precursors prepared from acid (or alkali) and melamine have attracted great attention because they have large surface area and abundant accessible active sites. However, they are highly inefficient in separating charges, which limits their photocatalytic activity. Here, we prepared porous, rod-shaped carbon nitrides doped with oxygen by calcinating the precursors prepared from melamine and formic acid. The porous O-doped g-CN nanorods have a large surface area of 81.4 m g. In particular, the oxygen doped into the catalyst enables it to have high efficiency in utilizing light in a range of 420-600 nm, and significantly improves its ability to separate photogenerated carriers. Under light irradiation (λ ≥ 420 nm), the prepared catalyst exhibits high photocatalytic activity with a hydrogen production rate of 12,766 μmol gh, which is 18.3 times that of pure carbon nitride. This research provides a novel way of preparing highly active non-metallic photocatalysts.
棒状碳氮化物通过煅烧由酸（或碱）和三聚氰胺制备的超分子前体制备而成，因其具有大的表面积和丰富的可及活性位而受到极大关注。然而，它们在分离电荷方面效率极低，这限制了它们的光催化活性。在这里，我们通过煅烧由三聚氰胺和甲酸制备的前驱体制备了掺杂氧的多孔棒状碳氮化物。多孔 O 掺杂 g-CN 纳米棒具有 81.4 m²/g 的大表面积。特别地，掺杂到催化剂中的氧使其能够高效地利用 420-600nm 范围内的光，并显著提高其分离光生载流子的能力。在光照射下（λ≥420nm），所制备的催化剂表现出高的光催化活性，其产氢速率为 12766μmolgh，是纯氮化碳的 18.3 倍。这项研究为制备高活性的非金属光催化剂提供了一种新方法。
