光热增强光催化性能二氧化钛(B)/玻纤布复合研究

doi:10.15541/jim20180547

摘要/Abstract

摘要：

以玻璃纤维布为基底, 以TiH₂为原料, 通过简易的化学合成及溶胶-凝胶法制备了光热增强光催化性能的二氧化钛(B)/玻璃纤维布复合材料(B-T/GFC)。通过XRD、SEM和TEM检测合成材料的成分、结构和形貌, 采用分光光度计、光学接触角测量仪、太阳光模拟器对材料的性能进行了系统研究。结果表明: 该复合材料表面形成了锐钛矿晶型的黑色TiO₂薄膜, 且晶体中存在厚度约为1 nm的无序层。同时该复合材料在250~2000 nm波长范围内具有较强的光吸收能力, 且具有强疏水性; 在 1 个太阳光强度下(1 kW/m ²), 相对于玻璃纤维布具有更强的光热能力; 其光催化降解切削废液中有机污染物(COD)的能力优于黑色TiO₂(B-T)和P25, 光照2 h的降解率约为P25的2.3倍。由此可见, B-T/GFC复合材料具有优异的光热增强光催化性能, 具有广阔的应用前景。

关键词: 黑色二氧化钛, 溶胶-凝胶法, 光热, 光催化

Abstract:

Titanium dioxide (B)/glass fiber cloth (B-T/GFC) composites with photothermal enhanced photocatalytic properties were prepared by using a facile chemical synthesis and Sol-Gel method, using the glass fiber cloth and TiH₂ as substrate and precursor, respectively. XRD, SEM and TEM were employed to investigate the composition, structure and morphology of B-T/GFC composite. Different properties of the materials were studied by spectrophotometer, optical contact angle measuring instrument and solar simulator. The results show that the composite surface is composed of anatase black TiO₂ with a disordercoating of about 1 nm. Meanwhile, the B-T/GFC composite with high hydrophobicity has strong absorption ability in the wavelength range from 250 nm to 2000 nm. Compared with glass fiber cloth, the B-T/GFC composite reveals better photothermal ability under sunlight with one solar intensity (1 kW/m ²). The photocatalytic degradation ability of B-T/GFC composite in organic pollutants cutting waste solution is better than those of pure black TiO₂ (B-T) and P25. After irradiation for 2 h, the degradation of COD over B-T/GFC composite is about 1.3 times higher than that of P25. The B-T/GFC composite possessing excellent photothermal enhanced photocatalytic properties performance may lead to a range of novel applications.

Key words: black titanium dioxide, Sol-Gel method, photothermal, photocatalysis

中图分类号:

TQ174

朱本必,张旺,张志坚,章建忠,IMRAN Zada,张荻. 光热增强光催化性能二氧化钛(B)/玻纤布复合研究[J]. 无机材料学报, 2019, 34(9): 961-966.

ZHU Ben-Bi,ZHANG Wang,ZHANG Zhi-Jian,ZHANG Jian-Zhong,IMRAN Zada,ZHANG Di. Photothermal Enhanced Photocatalytic Properties of Titanium Dioxide (B)/Glass Fiber Cloth[J]. Journal of Inorganic Materials, 2019, 34(9): 961-966.

图/表 7

图1 B-T/GFC在不同倍率下的SEM照片(a~c)及其EDS能谱(d)

Fig. 1 Different magnification SEM images of B-T/GFC (a-c), and the corresponding EDS pattern of B-T/GFC (d)

图2 B-T/GFC、B-T和P25的XRD图谱

Fig. 2 XRD patterns of B-T/GFC, B-T and P25

图3 B-T/GFC在不同倍数下的透射电镜照片(a,b), 高分辨率电子显微镜照片(c)及其SEAD图案(d)

Fig. 3 Different magnification TEM images (a,b), HRTEM image (c) of B-T/GFC , and SAED pattern of B-T/GFC (d)

图4 P25、B-T/GFC和B-T在250~2000 nm波长范围内的光吸收曲线

Fig. 4 UV-Vis-NIR absorption spectra of P25, B-T/GFC and B-T

图5 原始玻璃纤维布(a)和B-T/GFC (b)与水的接触角

Fig. 5 Contact angles of (a) original glass fiber cloth and (b) B-T/GFC with water

图6 GFC样品(a~c)和B-T/GFC样品(d~f)以及在不同时间的红外热图像: GFC和B-T/GFC样品在光照60 min内的界面温度曲线图(g)以及图(c)和(f)中标记线的温度分布图(h)

Fig. 6 IR thermal images of GFC sample (a~c) and B-T/GFC sample (d-f) with light irradiation on for different time, (g) the surface temperature of the water of GFC and B-T/GFC samples after 60 min irradiation (g), and temperature profiles of the marked lines in the Fig. (c) and (f) (h)

图7 (a) B-T/GFC、P25/GFC和B-T粉末光催化降解曲线图, (b) B-T/GFC四次循环光催化降解曲线图

Fig. 7 (a) Photocatalytic decomposition of COD under solar light irradiation catalyzed by P25/GFC, B-T/GFC and B-T powder, and (b) cycling runs for the photocatalytic decomposition of COD catalyzed by B-T/GFC

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