Abstract Hematite (α-Fe2O3) has been widely used as a photocatalyst for photo-Fenton oxidation due to its low cost, environmental friendliness, and high efficiency. The Photo-Fenton oxidation performance can be improved for practical applications via bandgap engineering of the photocatalyst. Herein, hematite nanoplate (HNP) is synthesized via a solvothermal method and a hydrogenation treatment, resulting in hydrogenated HNP (H-HNP). Materials characterizations demonstrate the even distribution of oxygen vacancies, formation of Fe (II) species on H-HNP, the enhanced light absorption, and separation of photogenerated e−/h+ pairs. Under simulated solar light, in comparison with pristine HNP, the H-HNP delivered significantly higher photo-Fenton oxidation activities under near-neutral pH conditions for the degradation of 50 mg L−1 Rhodamine B, Congo red, and Methylene blue after 20 min, i.e., 92.7%, 98.2%, and 77.2%, respectively. Mechanistic explorations, including XPS and radical trapping analysis, suggest that positively charged holes (h+) and catalytically formed hydroxyl radicals ( OH) were the main factors contributing to the higher photo-Fenton oxidation performance of H-HNP. Overall, hydrogenation treatment is an easy and effective means for bandgap engineering to improve the photocatalytic performance of photocatalysts as demonstrated by the as-prepared H-HNP as a high-performance photocatalyst for the photo-Fenton oxidation reaction.

中文翻译：

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用于增强有机化合物的光催化和光芬顿氧化的氢化赤铁矿纳米片

摘要 赤铁矿(α-Fe2O3)以其低成本、环保、高效等优点被广泛用作光芬顿氧化的光催化剂。通过光催化剂的带隙工程可以提高光芬顿氧化性能以用于实际应用。在此，赤铁矿纳米片（HNP）是通过溶剂热法和氢化处理合成的，得到氢化的HNP（H-HNP）。材料表征证明了氧空位的均匀分布、H-HNP 上 Fe (II) 物质的形成、增强的光吸收以及光生 e-/h+ 对的分离。在模拟太阳光下，与原始 HNP 相比，H-HNP 在近中性 pH 条件下对 50 mg L-1 罗丹明 B 的降解具有显着更高的光芬顿氧化活性，20 分钟后的刚果红和亚甲蓝，分别为 92.7%、98.2% 和 77.2%。包括 XPS 和自由基捕获分析在内的机理探索表明，带正电荷的空穴 (h+) 和催化形成的羟基自由基 (OH) 是导致 H-HNP 具有更高光芬顿氧化性能的主要因素。总的来说，氢化处理是带隙工程提高光催化剂光催化性能的一种简单有效的手段，正如所制备的 H-HNP 作为光芬顿氧化反应的高性能光催化剂所证明的那样。表明带正电荷的空穴 (h+) 和催化形成的羟基自由基 (OH) 是导致 H-HNP 具有更高光芬顿氧化性能的主要因素。总的来说，氢化处理是带隙工程提高光催化剂光催化性能的一种简单有效的手段，正如所制备的 H-HNP 作为光芬顿氧化反应的高性能光催化剂所证明的那样。表明带正电荷的空穴 (h+) 和催化形成的羟基自由基 (OH) 是导致 H-HNP 具有更高光芬顿氧化性能的主要因素。总的来说，氢化处理是带隙工程提高光催化剂光催化性能的一种简单有效的手段，正如所制备的 H-HNP 作为光芬顿氧化反应的高性能光催化剂所证明的那样。