A microfluidic method capable of photodegrading dyes to prepare copper-loaded nano-titanium dioxide-chitosan composite microspheres

Abstract

The invention discloses a microfluidic method capable of photodegrading dyes to prepare copper-loaded nano-titanium dioxide chitosan composite microspheres. Tetrabutyl titanate solution is added to an acidic solution and mixed to form a nano-titanium dioxide gel. The solvent mixes the nano-titanium dioxide gel with the amino-terminated hyperbranched polymer to obtain a mixed solution, and then adds a copper ion solution to the mixed solution, and after drying, the copper-loaded nano-titanium dioxide powder is obtained, and the copper-loaded nano-titanium dioxide powder and chitosan are added to the acidic The solution is mixed to obtain a dispersed phase, the sorbitan fatty acid ester is mixed with a hydrocarbon mixture to obtain a continuous phase, the dispersed phase and the continuous phase are mixed in a microfluidic manner, and dried to obtain copper-loaded nano titanium dioxide chitosan composite microspheres. The composite microsphere prepared by microfluidic control in the present invention has high material utilization rate, large catalytic surface area and high catalytic activity of the microsphere itself, can effectively reduce the concentration of dye, reduce toxic components in dye wastewater, and protect the 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 for photodegrading dye micro-flow control and carrying copper nano titanium dioxide chitosan composite microspheres.Background technique[0002]The continuous development of society promotes the development of the chemical industry, but industrial waste water is also increasing during the development process. Dye wastewater is one of the main hazardous industrial wastewaters. It mainly comes from the dye and dye intermediate production industry. It consists of the mother liquor from the crystallization of various products and intermediates, the materials lost in the production process and the sewage that washes the ground. With the continuous growth of the dye industry, its production wastewater has become a major source of water pollution. In the dye production process, such as sulfonation, nitrification, diazotization, reduction, oxidation, and acid ...

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Problems solved by technology

[0006] (3) Heavy metal salts such as chromium, lead, mercury, arsenic, zinc, etc. 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 nano-titanium dioxide semiconductor material also has some shortcomings as a catalyst: first, it has a wide band gap (Eg=3.2ev), and can only absorb ultraviolet light with a wavelength less than 387nm, but it is not good for visible light, which accounts for most of the sunlight. Second, the probability of electron-hole recombination is high, the effective photon survival time is short, and the number is small, so that nano-titanium dioxide cannot fully exert its catalytic performance.

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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