协同光催化:使用高表面积g-C3N4和TiO2 - WO3 - Bi2O3/SiO2的异质结纳米复合材料增强有机染料的降解。

IF 5.8 3区 环境科学与生态学 0 ENVIRONMENTAL SCIENCES
Rezvan Abdollahpour, Amin Bazyari
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引用次数: 0

摘要

成功合成了高性能的高比表面积(HSA) g-C3N4和TiO2-WO3-Bi2O3/SiO2纳米复合材料(g-C3N4/TSBW),并对其在可见光下光催化降解水溶液中的有机染料进行了评价。采用XRD、N2吸附-脱附、FE-SEM、EDS、HR-TEM、FTIR、拉曼光谱、UV-Vis DRS和PL光谱对催化剂进行了表征。研究了g-C3N4含量、光催化剂负载、染料浓度和类型、溶液pH、清除剂和氧化剂对光催化降解过程的影响。g- c3n4光催化剂具有约100 m2/g的高比表面积,具有吸附和光催化降解罗丹明B (RhB)的综合效果。值得注意的是,使用1 g/L优化后的50% g- c3n4 /TSBW异质结光催化剂,初始RhB浓度为10 mg/L,仅在可见光照射20 min后,RhB降解率接近100%。这种高性能是由于g-C3N4与TSBW结合的协同效应,TiO2与g-C3N4之间形成II型异质结,有效抑制了光诱导载流子的重组。捕获实验提供了RhB光催化降解的机理,揭示了超氧自由基(•O2-)的重要贡献。基于这些捕集实验,提出了一种合理的光催化反应机理。最后,验证了50% g-C3N4/TSBW异质结光催化剂的可回收性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Synergistic photocatalysis: enhanced degradation of organic dyes using a heterojunction nanocomposite of high-surface-area g-C3N4 and TiO2 - WO3 - Bi2O3/SiO2.

High-performance nanocomposites of high-surface-area (HSA) g-C3N4 and TiO2-WO3-Bi2O3/SiO2 (g-C3N4/TSBW) were successfully synthesized and evaluated for their photocatalytic degradation of organic dyes in aqueous solution under visible light irradiation. The photocatalysts were characterized using XRD, N2 adsorption-desorption, FE-SEM, EDS, HR-TEM, FTIR, Raman spectroscopy, UV-Vis DRS, and PL spectroscopy. The study investigated the effects of g-C3N4 content, photocatalyst loading, dye concentration and type, solution pH, scavengers, and oxidants on the photocatalytic degradation process. The g-C3N4 photocatalyst, with a high surface area of approximately 100 m2/g, exhibited a combined adsorption and photocatalytic degradation effect for rhodamine B (RhB) removal. Notably, nearly 100% RhB degradation was achieved using 1 g/L of the optimized 50% g-C3N4/TSBW heterojunction photocatalyst with an initial RhB concentration of 10 mg/L after only 20 min of visible light exposure. This high performance resulted from the synergistic effect of combining g-C3N4 with TSBW, facilitated by the formation of a type II heterojunction between TiO2 and g-C3N4, which effectively suppressed the recombination of photoinduced charge carriers. Trapping experiments provided mechanistic insights into RhB photocatalytic degradation, revealing the significant contribution of superoxide radicals (•O2-). Based on these trapping experiments, a plausible photocatalytic reaction mechanism was proposed. Finally, the recyclability of the 50% g-C3N4/TSBW heterojunction photocatalyst was also demonstrated.

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来源期刊
CiteScore
8.70
自引率
17.20%
发文量
6549
审稿时长
3.8 months
期刊介绍: Environmental Science and Pollution Research (ESPR) serves the international community in all areas of Environmental Science and related subjects with emphasis on chemical compounds. This includes: - Terrestrial Biology and Ecology - Aquatic Biology and Ecology - Atmospheric Chemistry - Environmental Microbiology/Biobased Energy Sources - Phytoremediation and Ecosystem Restoration - Environmental Analyses and Monitoring - Assessment of Risks and Interactions of Pollutants in the Environment - Conservation Biology and Sustainable Agriculture - Impact of Chemicals/Pollutants on Human and Animal Health It reports from a broad interdisciplinary outlook.
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