Abstract Terbium-substituted layered double hydroxides with NO3− in the interlayer (NO3-LDH) were synthesized using a hydrothermal method. The synthesized NO3-LDH reacted with CO2 at 30 °C under a CO2 gas flow containing water vapor to produce CO2-absorbed LDH (CO3-LDH). Fluorescent spectroscopy clarified that the intensity of the excitation and emission spectra of the CO3-LDH increased with increasing CO2 absorption time and CO2 concentration under the CO2 gas flow. The CO3-LDH exhibited green photoluminescence owing to the transition of 5D4 → 7FJ (J = 3, 4, 5, 6), which was excited by UV-light irradiation at 353 nm. The bandgap of the CO3-LDH was greater than that of the NO3-LDH, which caused an increase of the intensity of the excitation and emission spectra of the CO3-LDH. It was clarified that the NO3-LDH is capable of capturing CO2 as a carbonate species under water vapor, and resultant CO3-LDH emitted green photoluminescence.

中文翻译：

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Tb取代层状双氢氧化物在环境温度下捕获和光致发光检测CO2气体的新应用

摘要 采用水热法合成了夹层为NO3−的铽取代层状双氢氧化物(NO3-LDH)。合成的 NO3-LDH 在 30°C 下在含有水蒸气的 CO2 气流下与 CO2 反应生成吸收 CO2 的 LDH（CO3-LDH）。荧光光谱表明，在 CO2 气流下，CO3-LDH 的激发和发射光谱强度随着 CO2 吸收时间和 CO2 浓度的增加而增加。由于 5D4 → 7FJ (J = 3, 4, 5, 6) 的转变，CO3-LDH 表现出绿色光致发光，其被 353 nm 的紫外光照射激发。CO3-LDH 的带隙大于NO3-LDH 的带隙，导致CO3-LDH 的激发和发射光谱强度增加。