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Comparative Study on Degradation of X-3B Dyes by Advanced Oxidation Processes Wang Zaosheng A and D are organic pollutants, which are easily oxidatively degraded after activation.

A certain amount of 12 is added to the waste water solution so that the contaminating molecules adsorbed on the surface of the semiconductor receive the generated electrons (e, b) and holes (h+vh), thereby causing a series of redox reactions. The toxic pollutants are degraded into non-toxic or less toxic substances. The curve in the curve is the degradation of X-3B by the photocatalyst of the semiconductor 02, which is completely decolored within 1 h.

In fact, the photocatalytic activity of T, 02 is also related to its specific surface area, particle size, and surface acidity and alkalinity. Crystallinity and activation temperature are related, and further exploration is needed in this regard.

Experiments show that COD gradually decreases with increasing reaction time, but its reduction is weaker. This is because as the degradation reaction progresses, the macromolecules become less and less, so that the attack probability of the radical particles is also reduced. However, in the 12-semiconductor catalytic system, due to the presence of Ti2 particles, it has the property of adsorbing organic matter and fine particles, so that the COD reduction tendency does not become small. Based on the above experiments, we conducted another combined experiment. Take 50mL of the above X-3B solution, adjust the pH=2.5, add 3% of H2021mL and Fe2+lmL, transfer to the photochemical reactor, degrade in J>320nm light for 20min. Then add 50mgTi2 in the conical flask. The same is used; l>320nm light irradiation for 30min, and then the COD filtered by the microfilter. The final experimental result is COD 3.20mg/L, COD removal 4 conclusion, etc., is an important AOP method today, mainly The primary reaction is continuously initiated, and free radicals and holes such as HO are generated, resulting in oxidation and decomposition of the organic matter. These methods have their own advantages and disadvantages. uv/h2o2 has poor absorption ability to ultraviolet light, but the quantum yield is high; while Fe2+ can increase the absorption of light and increase the degradation rate of organic matter; 1\02 photocatalysis can be recycle. In short, how to increase the generation rate of free radicals such as HO is the main development direction of photochemical environmental protection application research. Experiments show that the single advanced oxidation process has its advantages and disadvantages in the degradation of dye wastewater. However, when the two methods are combined, the effect is better than the single method, which provides a good idea for the environmental treatment of dye wastewater. method.

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