铌酸银可见光催化降解聚氯乙烯薄膜

doi:10.7503/cjcu20140185

摘要/Abstract

摘要：

采用涂层法在玻璃基底上分别制备了纯聚氯乙烯(PVC)薄膜和添加水热法制备的钙钛矿型铌酸银(AgNbO₃)光催化剂的复合薄膜(PVC-wAgNbO₃, 其中w为AgNbO₃的质量分数), 在500 W氙灯照射120 min条件下进行了薄膜的光催化降解实验. 利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和傅里叶变换红外光谱仪(FTIR)等对光照前后薄膜的形貌及光催化降解过程进行了表征. 结果表明, 在光催化降解过程中纯PVC薄膜失重率为4.09%, 而PVC-3%AgNbO₃, PVC-6%AgNbO₃, PVC-9%AgNbO₃和PVC-15%AgNbO₃复合薄膜分别失重20.36%, 23.52%, 27.62%和33.83%. AgNbO₃光催化剂加速了PVC薄膜的降解, 且随着AgNbO₃光催化剂添加量的增加, PVC薄膜的光催化降解速率不断增大.

关键词: 聚氯乙烯薄膜, 铌酸银, 可见光催化降解

Abstract:

Pure polyvinyl chloride(PVC) film and PVC-AgNbO₃ hybrid films were prepared on glass substrates via a coating method. The photocatalytic degradation experiments were carried out under xenon lamp irradiation. The samples were characterized by X-ray diffractometer(XRD), scanning electron microscope(SEM), and Fourier transform infrared spectrometer(FTIR). The results show that PVC-AgNbO₃ hybrid films have much higher photocatalytic degradation activity than pure PVC film. The photodegradation performance of the films can be evaluated directly by their mass loss. The mass loss of the pure PVC film was about 4.09% after irradiation under xenon lamp for 120 min, that of the PVC-3% AgNbO₃, PVC-6% AgNbO₃, PVC-9% AgNbO₃, and PVC-15% AgNbO₃ films reached about 20.36%, 23.52%, 27.62% and 33.83% after irra-diation for 120 min, respectively. The mass loss of PVC increased with the increase of the content of AgNbO₃. This result prove that the presence of AgNbO₃ remarkably promote the photocatalytic degradation rate of PVC film.

Key words: Polyvinyl chloride(PVC) film, AgNbO3, Visible photocatalytic degradation

中图分类号:

O643.3

TrendMD:

王丹丹, 刘俊渤, 常海波, 唐珊珊. 铌酸银可见光催化降解聚氯乙烯薄膜. 高等学校化学学报, 2014, 35(9): 1975.

WANG Dandan, LIU Junbo, CHANG Haibo, TANG Shanshan. Visible Photocatalytic Degradation of Polyvinyl Chloride Film by AgNbO₃ Photocatalyst^†. Chem. J. Chinese Universities, 2014, 35(9): 1975.

图/表 7

Fig.1 XRD pattern of AgNbO3

Fig.2 SEM image of AgNbO3

Fig.3 UV-Vis DRS spectrum of AgNbO3

Fig.4 Mass loss of the pure film and PVC-AgNbO3 composite films under visible light irradiation a. Pure PVC; b. PVC-3%AgNbO3; c. PVC-6%AgNbO3; d. PVC-9%AgNbO3; e. PVC-15%AgNbO3.

Fig.5 SEM images of the pure PVC film before(A) and after(B) photocatalytic degradation and PVC-AgNbO3 composite films after photocatalytic degradation(C—F) (C) PVC-3%AgNbO3; (D) PVC-6%AgNbO3; (E) PVC-9%AgNbO3; (F) PVC-15%AgNbO3.

Fig.6 XRD patterns of the pure PVC film before(a) and after(b) photocatalytic degradation and of PVC-AgNbO3 composite films after photocatalytic degradation(c—f) c. PVC-3%AgNbO3; d. PVC-6%AgNbO3; e. PVC-9%AgNbO3; f. PVC-15%AgNbO3.

Fig.7 FTIR spectra of the pure PVC film before(a) and after(b) photocatalytic degradation and of PVC-AgNbO3 composite films after photocatalytic degradation(c—f) c. PVC-3%AgNbO3; d. PVC-6%AgNbO3; e. PVC-9%AgNbO3; f. PVC-15%AgNbO3.

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