Preparation Of Cellulose-based Composite Membrane Materials And Its Application In Radiation-resistant And Photocatalytic Degradation

On the one hand,the traditional anti-radiation materials,such as lead,stainless steel,copper and other cumbersome and toxic material which are harmful to the human and environment.Economic,safety,Non-toxic and lightweight anti-radiation materials have become the direction of the future development in this aspect.On the other hand,the scarcity of clean water and the increasing use of renewable resources,it is a hot-button issue that sewage will be converted into clean water by using solar energy.Among them,due to a wide range of sources,safe and non-toxic,good biocompatibility and biodegradability and other excellent performance of the cellulose,it has been widespread concern because it can be prepared by the composite properties materials with a variety of other materials.In this paper,cellulose nanocomposite films were used as matrix to produce a material which have anti-radiation and photocatalytic water treatment effect by corresponding or blending the nanoparticles into it.The main contents are as follows:(1)Carboxylated nano-BaSO4/cellulose nanocomposite films were prepared by dissolving cellulose through alkali/urea aqueous solution and using carboxylated nano-BaSO4 as anti-radiation agent.The morphology and physicochemical properties of the films were studied systematically.And the anti-radiation effect was studied by DR(Direct Digital X-ray Imaging System).The results show that the prepared nanocomposite films have high transparency,high porosity and strong mechanical properties.The calculated results of gray value and the decay percentage of X-ray indicated that the composite films have good anti-radiation effect which can be strengthened with the increase of nano-BaSO4.(2)The gold nanoparticles were prepared by the method of citrate reduction,and three-layer structure of titanium dioxide-gold-cellulose film membranes are prepared by filtrating the nano-Au particles which are deposited and nano-titanium dioxide to adhere on the cellulose membrane.The morphology and physicochemical properties of the nanocomposite films were studied.The photocatalytic degradation experiments using rhodamine b as the wastewater model describe the nanocomposite films having high degradation ability.The results of electrochemical impedance spectroscopy and diffuse reflectance spectroscopy indicate that the photocatalytic degradation process of nano-titanium dioxide nanoparticles and the solar water vapor evaporation process of nano-Au particles have synergistic effect,which enhances the catalytic degradation effect of the nanocomposite films.In conclusion,the cellulose-based composite films prepared by dissolving cellulose in the alkali/urea aqueous solution and adding nano-particles with different functions.The composite films had better flexibility,high porosity and stronger mechanical properties.It has broad application prospects in the field of anti-radiation and photocatalytic degradation.