Abstract At present, most common catalysts are faced with the problem of high cost and only visible light response. Graphitic carbon nitride (g-C3N4) consists of elements C and N that are sufficiently abundant in the world and has visible light responses, but the electron-hole recombination rate of this photocatalyst is high. In this work, we directly prepare a series of g-C3N4-bismuth oxyhalides composites via facile in-situ deposition. Bismuth oxides with different chloro-iodine ratios (BiOClxI1-x) are prepared, followed by g-C3N4 deposition, setting up interfaces and improving photogenic charge carriers transfer. By testing the compositions, Cl:I = 8:2 in BiOClxI1-x and 10% of g-C3N4 doping amount enable the best photocatalytic performance of the samples. Under visible light irradiation, the degradation rate of rhodamine B (RhB) reaches 99% within 40 min. Through a variety of tests, the photogenerated hole (h+) and superoxide radical (•O2−) are found to play key roles in the degradation process. Cl element doping and heterojunction building improve the photocatalysis capacity of g-C3N4 and broaden the visible-light response of pure BiOI.

中文翻译：

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高效电荷分离的 g-C3N4/BiOClxI1-x 杂化物的简便合成用于可见光光催化

摘要 目前，最常见的催化剂都面临着成本高且只能响应可见光的问题。石墨氮化碳（g-C3N4）由世界上足够丰富的元素C和N组成，具有可见光响应，但这种光催化剂的电子-空穴复合率很高。在这项工作中，我们通过简单的原位沉积直接制备了一系列 g-C3N4-卤氧化铋复合材料。制备具有不同氯碘比 (BiOClxI1-x) 的氧化铋，然后进行 g-C3N4 沉积，建立界面并改善光生电荷载体转移。通过测试组合物，BiOClxI1-x 中的 Cl:I = 8:2 和 10% 的 g-C3N4 掺杂量使样品具有最佳的光催化性能。在可见光照射下，罗丹明B（RhB）的降解率在40分钟内达到99%。通过各种测试，发现光生空穴 (h+) 和超氧自由基 (•O2-) 在降解过程中起关键作用。Cl元素掺杂和异质结构建提高了g-C3N4的光催化能力并拓宽了纯BiOI的可见光响应。