Influence of pH Value on the Performance of Composite Films Prepared from Chromium Residue by Hydrothermal Method

doi:10.3724/SP.J.1077.2013.12239

Abstract

Abstract:

With chromium residue as main raw materials, the composite films were prepared by hydrothermal method. The samples were characterized by SEM, ICP, XRD, FT-IR and film thickness, and the influences of hydrothermal pH value on the performance of composite films were investigated using the films’ refractive index and reflectivity as evaluation indexes. The results show that the perfect three dimension networks are appeared on the film surface when pH value is above 11. At pH value of 9 or 10, Al₂O₃, Fe₂O₃, Fe(OH)₃, Cr₂O₃, AlO(OH) and MgO crystals are formed in the sample, and the diffraction peak of them is strong. There are pores and surface absorbed water between internal nanoparticles in the samples. In the process of hydrothermal synthesis, the formation of chemical bonds force between the membrane material and basement are facilitated by the alkaline groups. Meanwhile, the thicker film is the smaller the refractive index of the film will be. At pH value of 11, the film is the thinnest and the refractive index is the biggest. At the initial pH value of 12, the refractive index of the film to ultraviolet light is weaker than glass substrate, and at the initial pH value of 11, the refractive index of the film to visible light is weaker than that of glass substrate.

Key words: chromium residue, comprehensive utilization, hydrothermal synthesis, composite film

CLC Number:

X753
TB332

SUN Tong, LIU Lian-Li, XU Shu-Ying, PENG Xiao-Lin, YANG Hai-Long. Influence of pH Value on the Performance of Composite Films Prepared from Chromium Residue by Hydrothermal Method[J]. Journal of Inorganic Materials, 2013, 28(4): 387-392.

Figures/Tables 6

Fig. 1 SEM microphotographs of the films prepared with different hydrothermal pH values (a) pH=7; (b) pH=8; (c) pH=9; (d) pH=10; (e) pH=11; (f) pH=12

Table 1 The percentage composition of metallics in the powders

Metallic element	Fe₂O₃	Al₂O₃	CaO	Cr₂O₃	MgO	Na₂O	K₂O
Mass percentage/%	30.46	12.26	5.27	5.83	13.71	2.98	0.97

Fig. 2 XRD patterns of the powders prepared with different hydrothermal pH values (a) pH=7; (b) pH=8; (c) pH=9; (d) pH=10; (e) pH=11; (f) pH=12

Fig. 3 FT-IR spectra of the powders prepared with different hydrothermal pH values (a) pH=7; (b) pH=8; (c) pH=9; (d) pH=10; (e) pH=11; (f) pH=12

Fig. 4 Film thickness and refractive index of the films prepared with different hydrothermal pH values

Fig. 5 Reflectivity of the films prepared with different hydrothermal pH values

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