Abstract A sequence of Bi2O3/g-C3N4 nanocomposites with diverse Bi2O3 content (0.5–5 molar %) has been synthesized by the sonication-mixture method using mesoporous β-Bi2O3 and g-C3N4 and utilized as efficient photocatalysts for hydrogen generation from aqueous glycerol solutions beneath visible light irradiation. Mesoporous Bi2O3 particles were effectively integrated at the exterior of two-dimensional (2D) g-C3N4 nanolayers producing effective heterojunctions that facilitate the charge transference amongst g-C3N4 and Bi2O3 and minimize the recombination of photocharges. The number and efficiency of the heterojunctions in the Bi2O3/g-C3N4 nanocomposites depend on the Bi2O3 amount, reaching the optimal development at 3.0 molar % of Bi2O3. The maximum H2 production was then obtained on the 3.0% β-Bi2O3/g-C3N4 nanocomposite that achieves a production (8600 μmol g−1) 20-fold greater than that obtained on bare β-Bi2O3 and g-C3N4 counterparts. The improvement in the photoactivity of Bi2O3/g-C3N4 nanocomposites was analyzed taking into account the differences in the capability of the nanocomposites to fascinate visible light and the efficiency of detaching the photoinduced charges derived from the different Bi2O3 content in the nanocomposites.

中文翻译：

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Bi2O3/g-C3N4 纳米复合材料是可见光下甘油水溶液制氢的高效光催化剂

摘要 使用介孔 β-Bi2O3 和 g-C3N4 通过超声混合法合成了一系列具有不同 Bi2O3 含量（0.5-5 摩尔 %）的 Bi2O3/g-C3N4 纳米复合材料，并将其用作甘油水溶液制氢的有效光催化剂。可见光照射下的溶液。介孔 Bi2O3 颗粒有效地集成在二维 (2D) g-C3N4 纳米层的外部，产生有效的异质结，促进 g-C3N4 和 Bi2O3 之间的电荷转移，并最大限度地减少光电荷的复合。Bi2O3/g-C3N4 纳米复合材料中异质结的数量和效率取决于 Bi2O3 的量，在 3.0 摩尔百分比的 Bi2O3 下达到最佳发展。然后在 3 上获得最大的 H2 产量。0% β-Bi2O3/g-C3N4 纳米复合材料的产量 (8600 μmol g-1) 比裸 β-Bi2O3 和 g-C3N4 对应物的产量高 20 倍。分析了 Bi2O3/g-C3N4 纳米复合材料光活性的改善，考虑了纳米复合材料吸引可见光的能力的差异以及分离源自纳米复合材料中不同 Bi2O3 含量的光致电荷的效率。