Photocatalytic Estrogen Degradation by the Composite of Tin Oxide Fine Particles and Graphene-like Carbon Nitride

IF 3.7 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Yuzuki Amino, Ayar Al-zubaidi, Yosuke Ishii and Shinji Kawasaki*, 
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Abstract

This study investigates whether 17β-estradiol (E2), a natural estrogen and one of the endocrine-disrupting chemicals responsible for water pollution, can be oxidatively decomposed under simulated solar light using a composite of tin oxide nanoparticles and graphene-like carbon nitride (g-CN) as a photocatalyst. The composite photocatalyst was prepared by heating a mixture of urea and tin acetate. FT-IR measurements revealed that g-CN possesses structural units similar to g-C3N4, a well-studied graphite-like carbon nitride. However, unlike g-C3N4, sharp diffraction lines were not observed in the XRD diffraction pattern of g-CN, indicating lower crystallinity. Elemental analysis showed that g-CN is slightly nitrogen-rich compared to g-C3N4, and UV–vis measurements indicated that the band gap of g-CN is slightly smaller than that of g-C3N4. The presence of tin in the composite of tin oxide and g-CN was clearly confirmed by XPS, although no sharp diffraction peaks were observed in the XRD patterns, suggesting the presence of microcrystals. Furthermore, FE-SEM observations did not reveal large tin oxide crystals, although EDS mapping indicated the presence of tin oxide. It was found that the prepared tin oxide and g-CN composites function effectively as photocatalysts for degrading E2 under simulated solar light. The degradation rate constant was evaluated to be k = 3.34 (0.14) × 10–2 min–1. Peroxide ion radicals were detected in ESR measurements from the irradiated solution, suggesting that peroxide ion radicals are generated through oxygen photoreduction as the counter-reaction of the oxidative decomposition of E2.

氧化锡细颗粒与石墨烯样氮化碳复合材料光催化降解雌激素的研究
本研究以氧化锡纳米颗粒和石墨烯样氮化碳(g-CN)复合材料为光催化剂,研究了17β-雌二醇(E2)是否能在模拟太阳光下被氧化分解。E2是一种天然雌激素,也是造成水污染的内分泌干扰化学物质之一。通过加热尿素和乙酸锡的混合物制备复合光催化剂。FT-IR测量显示,g-CN具有类似于g-C3N4的结构单元,g-C3N4是一种经过充分研究的类石墨氮化碳。然而,与g-C3N4不同,g-CN的XRD衍射图中没有明显的衍射线,表明其结晶度较低。元素分析表明,g-CN比g-C3N4略富氮,紫外-可见光谱测量表明,g-CN的带隙比g-C3N4略小。虽然在XRD图中没有观察到尖锐的衍射峰,但XPS清楚地证实了氧化锡和g-CN复合材料中锡的存在,表明存在微晶体。此外,FE-SEM观察没有发现大的氧化锡晶体,尽管EDS图谱显示了氧化锡的存在。结果表明,制备的氧化锡和g-CN复合材料在模拟太阳光照下能有效地作为光催化剂降解E2。降解速率常数为k = 3.34 (0.14) × 10-2 min-1。在ESR测量中检测到过氧化离子自由基,表明过氧化离子自由基是通过氧光还原作为E2氧化分解的反反应产生的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
ACS Omega
ACS Omega Chemical Engineering-General Chemical Engineering
CiteScore
6.60
自引率
4.90%
发文量
3945
审稿时长
2.4 months
期刊介绍: ACS Omega is an open-access global publication for scientific articles that describe new findings in chemistry and interfacing areas of science, without any perceived evaluation of immediate impact.
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