Amino Yuzuki, Al-Zubaidi Ayar, Ishii Yosuke, Kawasaki Shinji
Department of Life Science and Applied Chemistry, Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan.
ACS Omega. 2024 Dec 6;9(50):49064-49070. doi: 10.1021/acsomega.4c03390. eCollection 2024 Dec 17.
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-CN, a well-studied graphite-like carbon nitride. However, unlike g-CN, 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-CN, and UV-vis measurements indicated that the band gap of g-CN is slightly smaller than that of g-CN. 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 = 3.34 (0.14) × 10 min. 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.
本研究调查了17β-雌二醇（E2），一种天然雌激素且是造成水污染的内分泌干扰化学物质之一，在模拟太阳光下能否使用氧化锡纳米颗粒与类石墨烯氮化碳（g-CN）的复合材料作为光催化剂进行氧化分解。该复合光催化剂通过加热尿素和醋酸锡的混合物制备而成。傅里叶变换红外光谱（FT-IR）测量表明，g-CN具有与g-CN相似的结构单元，g-CN是一种经过充分研究的类石墨氮化碳。然而，与g-CN不同的是，在g-CN的X射线衍射（XRD）图谱中未观察到尖锐的衍射线，这表明其结晶度较低。元素分析表明，与g-CN相比，g-CN略富氮，紫外可见光谱（UV-vis）测量表明g-CN的带隙略小于g-CN。尽管在XRD图谱中未观察到尖锐的衍射峰，但X射线光电子能谱（XPS）清楚地证实了氧化锡与g-CN的复合材料中存在锡，这表明存在微晶。此外，场发射扫描电子显微镜（FE-SEM）观察未发现大的氧化锡晶体，尽管能谱仪（EDS）图谱表明存在氧化锡。研究发现，制备的氧化锡与g-CN复合材料在模拟太阳光下能有效地作为光催化剂降解E2。降解速率常数经评估为 = 3.34（0.14）×10⁻³ min⁻¹。在电子顺磁共振（ESR）测量中从辐照溶液中检测到过氧离子自由基，这表明过氧离子自由基是通过氧光还原作为E2氧化分解的逆反应而产生的。
