Study On Preparation And Photocatalytic Properties Of Bi₂WO₆ Glass Ceramics

The environment pollution has been a difficult problem of human survival,which including water pollution,especially organic water pollution problems in food processing plants,paper mills and dye factory and so on,and the traditional photocatalyst TiO₂ only using about 5% ultraviolet light of the Sun.In recent years,the new photocatalyst Bi₂WO₆ has been paid more attention because of its good physical properties and good photocatalytic properties under visible light.The traditional preparation method of Bi₂WO₆ is mainly used for coating and powder state of photocatalytic degradation,the main problem is the state to powder will have hard to recover,secondary pollution problems;as the coating will have easy shedding and short service life etc..In this paper,B₂O₃-Bi₂O₃-WO₃ and Li₂B₄O₇-Bi₂WO₆ were used as raw materials to prepare the mother glass by melting method,and then the Bi₂WO₆ glass was precipitated by the heat treatment at a certain temperature.The main study of the system of glass forming range,glass physical and optical properties of Bi₂WO₆ glass ceramics,preparation conditions,physical and optical properties of Bi₂WO₆ glass ceramics,glass ceramics of different components of Bi₂WO₆ photocatalytic degradation of methyl orange and the effects of composition of 65B₂O₃-30Bi₂O₃-5WO₃ glass ceramics under different pH values,the effect of photocatalytic degradation of methyl orange 80Li₂B₄O₇-20Bi₂WO₆ glass at a certain temperature for different holding time under the effect of photocatalytic degradation of methyl orange.B₂O₃-Bi₂O₃-WO₃ and Li₂B₄O₇-Bi₂WO₆ were used as raw materials to prepare the mother glass by melting method,and then the Bi₂WO₆ glass was precipitated by the heat treatment at a certain temperature.The heat treatment temperature were 525 degrees and 500 degrees,the holding time of 2H to prepare Bi₂WO₆ transparent glass ceramics;with the changes between B₂O₃ and Bi₂O₃ molar ratio,the grain growth by?200?,?060?and?002?crystal face?131?crystal growth,the 65B₂O₃-30Bi₂O₃-5WO₃ of Bi₂WO₆ crystal most.The best and the photocatalytic effect,showed that the content of Bi₂WO₆ crystal has a great influence on the photocatalytic properties;the more Bi₂WO₆ in Li₂B₄O₇-Bi₂WO₆ system,the?131?diffraction peak is stronger,the more the amount of crystallization,the 80Li₂B₄O₇-20Bi₂WO₆ photocatalytic effect best,proving once again that the content of Bi₂WO₆ crystal has a great influence on the photocatalytic performance.In order to further improve the photocatalytic,performance of the component80Li₂B₄O₇-20Bi₂WO₆ glass,XRD characterization and photocatalytic performance in heat treatment of 4h and 6h at 500?,after the results show that with the increase of heat treatment time,?131?diffraction peaks become stronger,better photocatalytic effect.