Fe2O3/g-C3N4光催化降解罗丹明B性能研究

doi:10.3969/j.issn.1000-5641.2021.03.015

摘要/Abstract

摘要：

为了改善g-C₃N₄比表面积低等缺点, 通过高温热聚合法制备了三维(3D)多孔g-C₃N₄, 并通过与Fe₂O₃复合得到Fe₂O₃/g-C₃N₄催化剂, 提高其可见光响应. Fe₂O₃/g-C₃N₄在g-C₃N₄含量为900 mg、罗丹明B(Rhodamine B, RhB)浓度为20 mg·L^–1、H₂O₂为15 mmol时脱色速率最快, 30 min可达到100%. 同时Fe₂O₃/g-C₃N₄对其他有机物也表现出较好的降解性能, 在30 min内对甲基橙(Methyl orange, MO)、四环素(Tetracycline, TC)的降解率分别达到80%和90%. 通过活性基团捕获实验探究Fe₂O₃/g-C₃N₄的光催化降解机制, 实验结果表明h⁺和·OH在Fe₂O₃/g-C₃N₄光催化降解有机物过程中起到主要作用.

关键词: g-C₃N₄, 氧化铁, 罗丹明B, 光催化

Abstract:

In order to improve the low specific surface area of g-C₃N₄, three-dimensional (3D) porous g-C₃N₄ was prepared using high temperature thermal polymerization. Fe₂O₃/g-C₃N₄ catalyst was prepared by compositing the g-C₃N₄ with Fe₂O₃ to improve its visible light response. The decolorization rate of the Fe₂O₃/g-C₃N₄ catalyst reached 100% in 30 minutes with a g-C₃N₄ content of 900 mg, Rhodamine B (RhB) concentration of 20 mg·L^–1, and H₂O₂ content of 15 mmol. The Fe₂O₃/g-C₃N₄ catalyst also demonstrated good performance in degrading other organics; the degradation rates of Methyl orange (MO) and Tetracycline (TC) reached 80% and 90%, respectively, in 30 minutes. This photocatalytic mechanism was explored by active group capture experiments, and the results show that h⁺ and ·OH play an important role in the progress of photocatalysis.

Key words: g-C₃N₄, Fe₂O₃, Rhodamine B(RhB), photocatalytic

中图分类号:

O469

席清华, 黄宜强, 陈加祥, 聂耳, 孙卓. Fe₂O₃/g-C₃N₄光催化降解罗丹明B性能研究[J]. 华东师范大学学报（自然科学版）, 2021, 2021(3): 151-160.

Qinghua XI, Yiqiang HUANG, Jiaxiang CHEN, Er NIE, Zhuo SUN. Study on Fe₂O₃/g-C₃N₄ photocatalytic degradation of Rhodamine B[J]. Journal of East China Normal University(Natural Science), 2021, 2021(3): 151-160.

图/表 11

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样品	比表面积/(m²·g^–1)	孔容/(cm³·g^–1)	孔径/nm
CN-1	61	0.35	2.98
CN-2	72	0.36	3.84
CN-3	72	0.36	3.84
CN-4	74	0.35	3.82
CN-5	74	0.35	3.83

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Fe₂O₃/g-C₃N₄光催化降解罗丹明B性能研究

Study on Fe₂O₃/g-C₃N₄ photocatalytic degradation of Rhodamine B

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