化工新型材料

化工新型材料 ›› 2022, Vol. 50 ›› Issue (9) : 201-205. DOI: 10.19817/j.cnki.issn1006-3536.2022.09.040

科学研究

α-Fe₂O₃/g-C₃N₄复合材料的制备及光催化性能

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Synthesis of the α-Fe₂O₃/g-C₃N₄ composite material and their highly improved photocatalytic performance

Yan Chao, Zhou Xun, Ji Haoqi, Kuang Daihong, Yang Zhanjin, Yang Fangyuan

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Received		Published
2021-05-11		2022-09-20
Issue Date	Revised Date
2022-09-27	2021-05-11

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摘要

采用水解法结合高温煅烧合成了一种高效的α-Fe₂O₃/石墨相氮化碳(g-C₃N₄)复合材料,通过控制前驱液中Fe³⁺的含量设定复合材料中α-Fe₂O₃的质量分数依次为1%,3%,5%和7%,考察了复合材料在可见光照射下对罗丹明B(RhB)的光降解性能。光催化实验结果表明:与纯g-C₃N₄相比,复合材料的光催化性能均得到有效提升,α-Fe₂O₃的最佳含量为3%(质量分数);90min内用量为20mg的3% α-Fe₂O₃/g-C₃N₄复合材料对高浓度(20mg/L)RhB溶液的降解率高达87%,而相同条件下纯g-C₃N₄的降解率仅为27%;一级动力学拟合曲线揭示3% α-Fe₂O₃/g-C₃N₄的光催化降解速率最高为0.0167,是纯g-C₃N₄降解速率的9.36倍。复合材料的高催化活性归因于α-Fe₂O₃的引入,在材料内部形成了p-n结,有效地抑制了光生-电子空穴对的复合。

Abstract

A new effective composite catalyst of α-Fe₂O₃/g-C₃N₄ was synthesized through hydrolyzing method combined with calcination process.The weight percent of the α-Fe₂O₃ in this composite was designed to be 1%,3%,5% and 7% respectively by controlling the mass of the Fe³⁺ in the precursors.The photocatalytic performance of the samples to rhodamine B (RhB) pollutions was investigated.The results confirmed that compared with pure g-C₃N₄,all composite materials exhibited much better photocatalytic performance,and the optimum was 3%(weight percent),whose degradation efficiency for RhB(20mg/L) can reach up to 87% in 90min.Nevertheless,the pure g-C₃N₄ merely achieve 27% at the same condition.The 3% α-Fe₂O₃/g-C₃N₄ composite also had the highest degradation rate constant 0.0167,which was almost 9.36 times compared with pure α-Fe₂O₃ sample.The excellent photocatalatic performance can be ascribed to the appearance of the α-Fe₂O₃ phase in the samples,leading the formation of the p-n heterojunctions between α-Fe₂O₃ and g-C₃N₄,which hugely depressed the combination of the photogenerated electrons-holes.

关键词

石墨相氮化碳(g-C₃N₄) / α-Fe₂O₃ / 复合材料 / 光催化 / 煅烧法

Key words

g-C₃N₄ / α-Fe₂O₃ / composite material / photocatalyst / calcination method

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α-Fe₂O₃/g-C₃N₄复合材料的制备及光催化性能[J]. 化工新型材料, 2022, 50(9): 201-205 DOI:10.19817/j.cnki.issn1006-3536.2022.09.040

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