Study On The Preparation Of Bismuth Molybdate Composite Material And Its Visible Light Catalytic Degradation Of Pollutants

The 21st century is an era of development,an era of human strides forward.At the same time,environmental pollution and energy crisis have become a world problem that needs to be solved urgently.Since the discovery of semiconductor photocatalysis technology in 1972,it has been involved in many application fields,and it has received extensive attention because of its use of renewable and abundant resources such as solar energy.However,on the one hand,most of its characteristics are powder,which is not easy to recycle and is greatly affected by environmental factors.On the other hand,most photocatalysts can only absorb ultraviolet light,which is difficult to use for visible light,which seriously restricts the photocatalyst application.?-Bi₂MoO₆ is an n-type semiconductor that responds under visible light.Its valence band position is 2.37 eV vs.NHE,indicating that its holes have strong oxidizing power and can degrade most pollutants.In this paper,the Bi₂MoO₆ photocatalyst with visible light response is loaded on alginic acid fiber and foam ceramic board.Through exploring the morphology structure,stability,load fastness,photocatalytic performance of the loaded fiber and the loaded ceramic.On this basis,the photoresponse performance of photocatalyst composite fibers and photocatalyst composite nanoceramics,as well as the photodegradation performance of composite fibers on simulated printing and dyeing wastewater?rhodamine B?and the photodegradation performance of composite nanoceramics on formaldehyde were studied.This article carried out the following two main works:?1?Using sodium alginate fiber prepared from non-toxic,harmless and biodegradable pure natural green materials as a carrier.The Bi₂MoO₆ photocatalyst and sodium alginate colloid were mixed thoroughly,and the alginate fiber composite material loaded with Bi₂MoO₆ photocatalyst was prepared by the wet spinning method.The structure,light response performance and photodegradation performance were studied.The results show that the alginate fiber-loaded Bi₂MoO₆ composite material has a stable structure and excellent light response performance.Compared with the powder,the degradation efficiency of the fiber composite material is about 20 times that of the powder of the same quality photocatalyst,which significantly improves the degradation efficiency of the simulated printing and dyeing wastewater?Rhodamine B?.?2?Using nano-ceramics as a carrier,Bi₂MoO₆ photocatalyst is evenly sprayed on the surface of ceramics by high-pressure spraying method to prepare nano-ceramic composite materials supporting Bi₂MoO₆ photocatalyst.The structure,photodegradation performance and conditions affecting the degradation of formaldehyde were studied.The results showed that the nano-ceramic-loaded Bi₂MoO₆ photocatalyst had a stable structure,strong adhesion,and the photocatalyst was not easy to fall off.It had a significant effect on formaldehyde degradation,and the load was explored.The degradation of formaldehyde by Bi₂MoO₆ photocatalyst nano-ceramic composites is affected by the amount of photocatalyst loading,formaldehyde concentration,and temperature.Humidity has no significant effect on formaldehyde degradation.The photocatalytic composite material was successfully made through two loading methods,which provided a good idea for the treatment of rhodamine B and formaldehyde.