改性鎢酸鉍催化降解有機廢水性能研究
[Abstract]:Because of the complexity of organic wastewater, it is difficult to degrade it effectively and thoroughly by conventional water treatment technology. Its large amount of substandard discharge makes pollutants enriched in the environment, which brings great harm to the ecological environment and human health. Therefore, it is urgent to develop new water treatment technology. In this paper, two kinds of bismuth ferrate doped tungstate photocatalysts with different morphology were synthesized by solvothermal method and hydrothermal method, respectively. The X-ray diffraction (XRD),) method was used to prepare two kinds of bismuth ferrate doped catalysts. X-ray energy dispersive spectroscopy (EDS) and field emission scanning electron microscopy (FESEM) were used to characterize the physical and chemical properties and morphology of bismuth ferric tungstate doped samples. The results show that the synthesized samples are obliquely square type bismuth tungstate semiconductor materials, and the EDS analysis shows that iron ions have been successfully doped into bismuth tungstate lattice. And the doping of Fe had no obvious influence on the morphology and size of the samples, which were spherical and flower-like in micron structure, respectively. The water quality of printing and dyeing wastewater is the most representative in the organic wastewater which is difficult to treat. In this experiment, direct scarlet dye solution was used as simulated wastewater, and two kinds of different ferric bismuth tungstate doped semiconductor materials were used as catalysts to study the catalytic degradation effect of ultrasonic cavitation and photocatalyst for treating direct red simulated dye wastewater. Under the optimum experimental conditions, the kinetic model of the reaction was fitted to the different factors affecting the catalytic reaction. The results show that: 1) the degradation of bismuth tungstate modified by ultrasound is superior to that of single ultrasonic, and the degradation performance of Fe doped bismuth tungstate is better than that of unadulterated bismuth tungstate, which indicates that the doping of iron ion improves the catalytic activity of the catalyst; 2) the ultrasonic degradation effect of direct scarlet dye wastewater will be affected by different factors, such as iron doping, catalyst dosage, solution initial concentration and pH value, ultrasonic frequency and power, etc. The results show that the catalyst has good stability. 3) in the kinetic study, all fitting lines have very high linear correlation, and the fitting similarity R2 is higher than 0.96, so the process of ultrasonic catalytic reaction accords with the first-order reaction kinetic model.
【學位授予單位】:西安工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:X703
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