Method capable of photocatalytically degrading dyes to prepare silver-loaded nano titanium dioxide PVP fiber in microfluidic mode

Abstract

The invention discloses a method capable of photocatalytically degrading dyes to prepare a silver-loaded nano titanium dioxide PVP fiber in a microfluidic mode. The method comprises the steps: addinga tetrabutyl titanate solution into an acid solution, mixing to form nano titanium dioxide gel, utilizing an organic solvent to mixing the nano titanium dioxide gel with amine terminated hyperbranchedpolymer to obtain mixed liquor, then adding a silver ion solution into the mixed liquor, drying to obtain silver-loaded nano titanium dioxide powder, mixing the silver-loaded nano titanium dioxide powder with PVP powder in the organic solvent to obtain a microfluidic spinning solution and spinning the microfluidic spinning solution into the silver-loaded nano titanium dioxide PVP fiber in a microfluidic mode. Catalytic fiber preparation in the method disclosed by the invention has a high material utilization rate, and the fiber has a large self catalyzing surface area and high catalytic activity, can effectively reduce dye concentration, can reduce toxic components in dye wastewater and can protect environment and water resources.

Description

technical field [0001] The invention relates to a preparation method of a photocatalytic degradation material, in particular to a method capable of photodegrading dye microfluids to prepare silver-loaded nano-titanium dioxide PVP fibers. Background technique [0002] The continuous development of society promotes the development of the chemical industry, but industrial wastewater is also increasing in the process of development. Dye wastewater is one of the main harmful industrial wastewater, which mainly comes from the production industry of dyes and dye intermediates. It is composed of the mother liquor of crystallization of various products and intermediates, materials lost during the production process, and sewage from washing the ground. With the continuous growth of the dye industry, its production wastewater has become a major source of water pollution. A large number of pollutants are produced in the process of dye production, such as sulfonation, nitration, diazoti...

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Problems solved by technology

[0006] (3) The chromium, lead, mercury, arsenic, zinc and other heavy metal salts in the heavy metal wastewater in the dye cannot be biodegraded, they can exist in the natural environment for a long time, and will continue to pass through the food chain and accumulate in the human body

[0007] (4) The content of organic matter in wastewater is high, the composition is complex, and the content of harmful substances is high

However, pure nanometer titanium dioxide semiconductor material also has some shortcomings as a catalyst: firstly, it has a wide band gap (Eg=3.2ev), which can only absorb ultraviolet light with a wavelength less than 387nm, and is not suitable for visible light, which accounts for most of the sunlight. Second, the recombination probability of electrons and holes is high, and the effective photon survival time is short and the number is small, so that nano-titanium dioxide cannot fully exert its catalytic properties.

Silver-loaded nano-TiO2 powder is an efficient photocatalytic product, but due to its poor hydrophilicity, the nano-powder cannot be collected and it is difficult to be directly applied

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