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Photocatalytic degradation of p-nitrophenol by cuprous oxide

wallpapers News 2021-11-22
Photocatalytic degradation of p-nitrophenol by cuprous oxide
A biological effect lamp was used to simulate natural light sources to study the photocatalytic degradation of p-nitrophenol by ultrafine particles of Cu2O prepared by the hydrolysis of cuprous chloride. The results showed that 1 1 2mg·l- 1, 2 2 4mg·l- 1 and 44 8mg·l- 1 The degradation rate of p-nitrophenol reached 90% in 10 hours. The degradation reaction conforms to the first-order reaction kinetics, and the 7 repeated use tests show that the service life of the catalyst is better than that of the sodium borohydride method. The catalyst is significantly extended, and the main intermediate products of degradation are p-benzoquinone and hydroquinone.
Prepare P-type semiconductor ultrafine cuprous oxide and apply it to the photocatalytic degradation of p-nitrophenol. After determining the main influencing factors and levels through single factor experiments, the response surface method (RSM) is used to analyze the ultrafine cuprous oxide. The main influencing factors of photocatalytic degradation are optimized. By analyzing the experimental results, a second-order polynomial mathematical model for the photocatalytic degradation of p-nitrophenol by ultrafine cuprous oxide is established. The best experimental conditions for predicting the treatment are: p-nitrophenol The mass concentration of the solution is 30mg·L^-1, the dropping amount of H2O2 is 0.28mL, the pH is 3.64, and the dosage of cuprous oxide is 0.11g. The verification experiment was carried out under the optimal conditions, and the true decolorization rate and the predicted decolorization were found The rate has a good consistency, and the relative error is only 3.02%.
The Cu2O powder was prepared by the CuCl hydrolysis method, and the Cu2O particles were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Under the irradiation of a sun-like light source, the effect of Cu2O on the refractory organic pollutant p-nitrophenol in water was studied. Photocatalytic degradation effect. The results show that p-nitrophenol is almost completely degraded within 8 hours. When the catalyst dosage is 0.2 g, 200mL p-nitrophenol solution with a concentration of 22.4 mg/L has a good degradation effect. Degradation. The reaction conforms to the first-order reaction kinetics.
The self-made nano-TiO2 and Cu2O were used to study the photocatalytic degradation of p-nitrophenol. The results showed that under simulated sunlight conditions, the half-life of the cuprous oxide catalytic reaction of 100 mg l-1 p-nitrophenol aqueous solution was 20.0 min, while titanium dioxide did not It has the visible light catalytic ability; in the SGY-1 multifunctional photochemical reactor, the half-life of TiO2 catalytic degradation of p-nitrophenol is 48.1min. Product analysis shows that there are two degradation processes in the photocatalytic reaction of n-type semiconductor titanium dioxide, forming two Hydroxynitrobenzene may remove the nitro group. However, the photodegradation reaction catalyzed by the p-type semiconductor cuprous oxide did not detect the denitration product, only 1,2-dihydroxy-4-nitrobenzene was detected.