Method capable of photocatalytically degrading dyes to prepare copper-loaded nano titanium dioxide chitosan composite microspheres in microfluidic mode

Abstract

The invention discloses a method capable of photocatalytically degrading dyes to prepare copper-loaded nano titanium dioxide chitosan composite microspheres in a microfluidic mode. The method comprises the steps: adding a 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 hyperbranched polymer to obtain mixed liquor, then adding a copper ion solution into the mixed liquor, drying to obtain copper-loaded nano titanium dioxide powder, adding the copper-loaded nanotitanium dioxide powder and chitosan into the acid solution to be mixed to obtain a dispersion phase, mixing sorbitan fatty acid ester with a hydrocarbon mixture to obtain a continuous phase, mixingthe dispersion phase with the continuous phase in a microfluidic mode and drying to obtain the copper-loaded nano titanium dioxide chitosan composite microspheres. According to the method disclosed bythe invention, the composite microspheres are prepared in the microfluidic mode, so that a material utilization rate is high; the microspheres have large self catalyzing surface areas and high catalytic activity, can effectively reduce dye concentration, reduce toxic components in dye wastewater and protect environment and water resources.

Description

technical field [0001] The invention relates to a method for preparing a photocatalytic degradation material, in particular to a method for preparing copper-loaded nano-titanium dioxide chitosan composite microspheres capable of photodegrading dye microfluidics. 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 sulfon...

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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.

Copper-loaded nano-TiO2 powder is an efficient photocatalytic product, and a small amount of addition can achieve the catalytic effect, but it is difficult to be directly applied due to its poor hydrophilicity.

The copper-loaded nano-TiO2 powder produced by the general method has poor uniformity in size and size, and the catalytic effect in actual use is unstable.

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