Titanium dioxide nanotube array morphology formed by anodization on titanium alloy surface
Degradation efficiency of Rhodamine B in water under visible light before and after non-metal doping of titanium dioxide nanotube array
With the rapid development of industry, environmental pollution has become increasingly serious and has become a global crisis. Countries all over the world have paid great attention to reducing emissions, purifying air and sewage treatment. Researchers at the Surface Division of the Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, used electrochemical methods to construct titanium dioxide nanotube arrays in situ on the surface of titanium substrates for gas purification and advanced wastewater treatment. This technology increases the specific surface area of ​​titanium dioxide by preparing a nanotube array structure and significantly improves the catalytic degradation efficiency. By using non-metallic element doping, the titanium dioxide structure can effectively degrade and purify the sewage and gas under visible light, and has certain effects on relieving the haze.
The inner diameter of the nanotubes formed on the surface of the titanium substrate can be controlled at 50 nm-150 nm, and the nanotube length can be controlled at 200 nm-500 nm. The non-metallic doping of titanium dioxide nanotubes can be achieved by ion implantation and nitridation treatment methods, so that the photoresponsive region widens from the ultraviolet region to the visible region. The titanium products or titanium plated decorative parts formed by this technology are placed indoors and can purify the indoor air under sunlight and fluorescent lighting, and degrade harmful gases such as formaldehyde in the air. Being fixed in the exhaust pipe of an automobile can degrade harmful gases in the automobile exhaust. The sewage processor is used to degrade the hard-degradable organics in the sewage using visible light, and the sewage can be deeply purified.
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