Photocatalytic hollow silica optical fiber and manufacturing method

Abstract

The invention discloses a photocatalytic hollow quartz optical fiber and a manufacturing method thereof. The photocatalytic hollow quartz optical fiber comprises an optical fiber core and an optical fiber cladding used for wrapping the optical fiber core; the photocatalytic hollow quartz optical fiber is characterized in that the optical fiber core is air, and the optical fiber cladding is made from quartz; an optical fiber coating layer is arranged on the outer surface of the optical fiber cladding; the optical fiber coating layer is set as a slope, and the outer diameter of an optical input end of the optical fiber is smaller than that of the tail end of the optical fiber; the optical fiber coating layer is an Er<3+>: YAlO3 / SiO2 / TiO2 composite photocatalytic film. The photocatalytic hollow quartz optical fiber has good visible light response characteristic, and is high in utilization efficiency of solar energy, photocatalytic efficiency and photocatalytic activity; the photocatalytic hollow quartz optical fiber has the characteristics being corrosion-resistant, low in price, reusable, and the like; the photocatalytic hollow quartz optical fiber further improves the mode that light beams are transmitted between the optical fiber cladding and a photocatalytic coating layer, so that the uniformity of photocatalytic performance of the surface of the optical fiber is enhanced. The photocatalytic hollow quartz optical fiber is simple in manufacturing method and unique in structure, and can be widely applied to the fields such as biology, energy and environmental protection.

Description

technical field [0001] The invention relates to a hollow optical fiber, in particular to a photocatalytic hollow silica optical fiber and a manufacturing method. Background technique [0002] Photocatalytic technology has gradually developed into an important emerging environmental protection technology since the 1970s due to its many advantages such as high efficiency, low energy consumption, less pollution, low price, wide application range and deep oxidation ability. The most important substance in the photocatalytic reaction system is the photocatalytic semiconductor material. Among the photocatalytic semiconductor materials, TiO 2 Nanomaterials have a large band gap (about 3.2eV), and the electrons and holes generated under light induction have strong reduction and oxidation capabilities, which exceed the oxidation capabilities of ordinary oxidants; at the same time, TiO 2 Photocatalysts can directly utilize the ultraviolet spectrum in sunlight to completely mineralize...

AI Technical Summary

Problems solved by technology

Although, the refraction and scattering effect of the light beam in the radial direction of the fiber is beneficial for the light beam to enter the TiO 2 Phase, excited to generate electron-hole pairs, thus triggering photocatalytic oxidation reaction; but due to the strong penetrating ability of refraction and scattering light, it is much larger than that of TiO 2 The thickness of the photocatalytic film

Therefore, transport to TiO 2 Phase light is only partly covered by TiO 2 absorbed, the rest pass through TiO 2 layer is absorbed by the surrounding medium, resulting in inefficient use of light energy

In addition, due to the fiber core and TiO 2 The difference in the refractive index of the coating layer will lead to changes in the transmission mode of the light beam in the fiber, and the light radiation attenuation on the surface of the fiber along the axial direction of the fiber is seriously attenuated, that is, the surface of the fiber near the light source has a strong light radiation ability and is easy to photocatalyze The system produces light suppression, and the light radiation flux on the surface of the fiber far away from the light source is low, resulting in light confinement, which ultimately affects the light energy utilization efficiency and TiO 2 Efficiency of Photocatalytic Degradation of Organic Pollutants

Again, for TiO 2 Loading plastic optical fiber carrier, although the plastic optical fiber has good flexibility and high cost performance; but high-resolution organic polymers such as silicone rubber and PMMA polymers are easily dissolved by some organic pollutants, and it is not easy to run for a long time; at the same time, the organic polymer itself will Absorption of ultraviolet light also leads to low light energy utilization efficiency

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