The Study Of Photocatalytic Degradation Of Organic Pollutant Phenol In Groundwater Of A Power Plant In Ningxia Hui Autonomous Region

Groudwater is an important component of fresh water resources for human survival.With the rapid development of society economy,the organic wastewater emissions of industrial,pollution of surface water and livestock manure and pesticide polluted water into the aquifer so as to make the most of the city and the area of groundwater pollution.Due to the organic pollution in groundwater is not easily found and it is difficult to manage,it is urgent to find ways to solve the groundwater pollution control,and has become an important research topic in the field of water environment.In many methods of water pollution control,the method of photocatalytic oxidation of refractory organic pollutants in water is efficient and convenient,low cost,no secondary pollution and other advantages,and become the forefront and the research hot spot of water pollution control technology.In the paper,a power plant in Ningxia Hui Autonomous Region is chosen as the groundwater pollution investigation area.Using field sampling method,analyze the groundwater samples collected.The results showed that the organic pollutant phenol in groundwater was seriously exceeded in the investigated area,and the concentration was 20.4mg/L.Phenol is a kind of phenolic compounds with special odor,toxicity and strong corrosiveness.According to the organic pollutants phenol overweight problem,through simulation experiments,the photocatalytic technology was used to degrade it in the laboratory,and provides sufficient experimental basis for treatment of organic pollution of groundwater survey area.This paper mainly studies the justive synthesis of these nanomaterials:several typical cubic phase metal oxides MO_x?M=In,Co,Ti,Fe?,loaded Ag or g-C₃N₄ composite metal oxides(Ag/MO_x and g-C₃N₄/MO_x)and the ternary composite Ag/g-C₃N₄/?-Fe₂O₃,and to investigate the effect of photocatalytic activity of these nanomaterial for phenol in groundwater,and analzes the photocatalytic degradation mechanism.Fistly,in this paper,four kinds of different shapes of metal oxide MO_x are prepared by a modified one-step hydrothermal method;the composite metal oxides loaded Ag are prepared by a volume impregnation method;and the composite metal oxide loaded g-C₃N₄ were prepared by hydrothermal and ultrasonic methods;and the ternary composite Ag/g-C₃N₄/?-Fe₂O₃ is prepared.Secondly,the surface structure and optical performance of these prepared photocatalyst are analied and researched through the advanced modern characterization techniques,such as X-ray diffraction?XRD?,scanning electron microscope?SEM?,transmission electron microscope?TEM?,uv-vis diffuse reflection?DRS?,infrared absorption spectrum?FTIR?and X-ray photoelectron spectroscopy?XPS?and so on.Finally,with xenon lamp as the light source to simulate sunlight,the comparative experiments of photocatalytic degradation phenol conducted on the prepared photocatalyst.The results show that the Ag/g-C₃N₄/?-Fe₂O₃ catalyst particles are spherical,and it has a strong absorption peak in the entire spectral region of the spectrum.The photocatalytic efficiency of Ag/g-C₃N₄/?-Fe₂O₃ catalyst is the best in the degradation experiments.This new photocatalyst can be applied to control the organic pollution in groundwater of the power plant.