Preparation Of Functional Cellulose Composite Membrane And Its Photocatalytic Properties

With the rapid development ofchemical fiber and textile industry,the excessive drainage of the dyeing industrial wastewater becomes increasingly prominent and the treatment of organic pollutants in wastewater has become an urgent problem for environmental protection.The most commonly used physical methods today have the disadvantage that they cannot completely remove contaminants,As a new type of pollutant degradation technology,photocatalysis technology become the research focus with the advantages of non-pollution and low energy consumption.Cellulose has the character of the low cost,environment friendly and good film reforming properties,which is suitable as a carrier for semiconductor photocatalysis.In this paper,the semiconductor metal compounds was loaded onto cellulose carriers to prepare the composite catalytic material by impregnation-precipitation method.Besides,SEM,XRD and other characterization tests were carried out and the catalytic performance were investigated by using methyl orange and rhodamine B as degradation materials.?1?Using cellulose paper?CP?as the carrier,Ag X/cellulose paper composite photocatalytic material was prepared by adsorption of Ag X.It was characterized and photocatalytic degradation experiments were carried out with methyl orange as the target pollutant.The results showed that cellulose paper had a network structure,which could significantly increase the specific surface area and the adsorption performance of the catalyst,preventing the loss of the active components.Ag Cl/CP,Ag₂O/CP,Ag₂CO₃/CP,and Ag₃PO₄/CP were prepared.Unde visible light irradiation for 90 min,the proportion of methyl orange degraded was 86%?17%?97.8%?31.5%,respectively.Ag₂CO₃ was most effective,but its activity would be lost after the third use.Moreover,Ag Cl/CP material took second place,with the ratio of photodegradation of methyl orange reduced to 60.3%in the third use.?2?Cellulose acetate?CA?and silk protein powder?SF?were mixed to prepare CA/SF at a mass ratio of 3:1,then Ag Cl was adsorbed onto the carrier for the preparation of Ag@Ag Cl-CA/SF composite photocatalytic materials.It was characterized and photocatalytic degradation experiments were carried out with rhodamine B as the target pollutant.The results showed that the unique structure and groups of CA/SF enhanced the adsorbability of the pollutant.As a result,the prepared Ag X-CA/SF material has good stability.Three photocatalytic materials of Ag Cl-CA/SF,Ag₂CO₃-CA/SF and Ag₃PO₄-CA/SF were prepared.Ag Cl-CA/SF had relatively stable structure and photocatalytic performance,and 97%of rhodamine B was degraded by visible light when the silver ion concentration was 0.1mol/L,the PH value was 3 and the illumination time 90 min.The degradation rate of rhodamine B was78.3%in the third use.?3?Cellulose acetate CA was also used as the carrier to prepare Bi OBr/CA composite by loading Bi OBr.By characterization of the prepared Bi OBr/CA and photocatalytic degradation of rhodamine B as the target pollutant,the results showed the catalyst had strong adsorption capacity for organic pollutants.When the mass ratio of cellulose diacetate to bismuth nitrate pentahydrate was 4:1,the degradation rate of rhodamine B was 98.6%under visible light irradiation for 1 hour at an initial p H of3.Furthermore,rhodamine B was still degraded at a ratio of 91%in the third use,which showed good stability.