木质素改性ZnO/CeO2异质结的紫外屏蔽性能研究

doi:10.12422/j.issn.1672-6952.2024.03.002

摘要/Abstract

摘要：

ZnO具有强紫外吸收能力，同时具有较高的光催化性能，因此限制了其在紫外屏蔽领域的应用。为探究ZnO在紫外屏蔽领域应用的可能性，使用VASP软件构建纳米ZnO/CeO₂异质结，并对其进行了电子性能和光学性能的模拟计算；用木质素和纳米ZnO/CeO₂异质结，制备了木质素改性的纳米ZnO/CeO₂异质结；通过FT-IR、XRD、SEM、UV-Vis-DRS等手段对样品进行表征，并以亚甲基蓝为保护对象对样品的紫外屏蔽性能进行了考察。结果表明，木质素改性的纳米ZnO/CeO₂异质结在280～420 nm处的光吸收性能优于同等条件下合成的改性前ZnO/CeO₂异质结；当紫外光照射70 min时，木质素改性的纳米ZnO/CeO₂异质结的亚甲基蓝保留率为77.92%，表明所合成的样品是具有高紫外屏蔽性能、低光催化活性的紫外屏蔽材料。

关键词: 木质素, ZnO/CeO₂, 异质结, 紫外屏蔽, 亚甲基蓝

Abstract:

ZnO has a strong UV absorption capacity, but also has a high photocatalytic performance, which limits its application in the field of UV shielding. In order to explore the possibility of ZnO's application in the field of ultraviolet shielding, this article uses VASP to construct a ZnO/CeO₂ heterojunction and performs electronic and optical simulation calculations on it. Then lignin is used to combine with the synthesized ZnO/CeO₂ heterojunction to prepare lignin-modified nano-ZnO/CeO₂ heterojunction. Through the FT-IR, XRD, SEM, UV-Vis-DRS means the characterization of samples. The UV shielding properties of the synthesized samples were investigated with methylene blue as the protection object. The results show that the light absorption performance of the samples at 280～420 nm is better than that of ZnO/CeO₂ samples. The retention rate of methylene blue for 70 min under UV irradiation was 77.92%, indicating that the synthesized sample was a UV shielding material with high UV shielding properties and low photocatalytic activity.

Key words: Lignin, ZnO/CeO₂, Heterojunction, Ultraviolet shielding, Methylene blue

中图分类号:

TQ13

宋悦, 吴限, 马诚, 李丽华. 木质素改性ZnO/CeO₂异质结的紫外屏蔽性能研究[J]. 辽宁石油化工大学学报, 2024, 44(3): 10-16.

Yue SONG, Xian WU, Cheng MA, Lihua LI. Study on UV Shielding Properties of Lignin Modified ZnO/CeO₂ Heterojunctions[J]. Journal of Liaoning Petrochemical University, 2024, 44(3): 10-16.

图/表 10

图1 ZC模型及各原子模型的态密度图像

Fig.1 Density of states images of the ZC model and each atomic model

图2 ZC模型在三个极化方向的吸收系数

Fig.2 Absorption coefficient of the ZC model in three polarization directions

图3 ZC模型在三个极化方向的折射率

Fig.3 Refractive performance of the ZC model in three polarization directions

图4 ZC模型在三个极化方向的消光系数

Fig.4 Extinction coefficients of the ZC model in three polarization directions

图5 ZC模型、ZC样品及LZC样品的XRD谱图

Fig.5 XRD spectra of ZC models, ZC samples and LZC samples

图6 木质素、ZC样品及LZC样品的红外光谱图

Fig.6 Infrared spectra of lignin, ZC samples and LZC samples

图7 ZC样品及LZC样品的漫反射曲线

Fig.7 Diffuse reflection curves of ZC samples and LZC samples

图8 ZC样品及LZC样品的Tauc plot图像

Fig.8 Tauc plot images of ZC samples and LZC samples

图9 ZC样品及LZC样品的扫描电镜图像（a） ZC样品（b） LZC样品

Fig.9 SEM images of ZC samples and LZC samples

图10 LZC、ZC、ZnO样品对紫外灯照射下MB保留率的影响

Fig.10 Effects of LZC, ZC and ZnO on the retention rate of methylene blue under ultraviolet irradiation

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木质素改性ZnO/CeO₂异质结的紫外屏蔽性能研究

Study on UV Shielding Properties of Lignin Modified ZnO/CeO₂ Heterojunctions

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