Preparation Of Graphene-inorganic Composite Membrane And The Research Of Their Properties Characterization In Wastewater Treatment

Graphene has attracted wide attention in the field of membrane materials due to its special two-dimensional nanostructures.At present,the application of graphene is divided into two aspects in the field of membrane.On the one hand,graphene can be used as an auxiliary material to enhance the properties of the membrane,such as mechanical strength,electrical conductivity and stain resistance of the membrane.On the other hand,self-assembly of graphene can be prepared due to its two-dimensional structure and benign membrane-forming properties.These membrane materials have been widely used in gas phase separation,ion separation and water desalination experiment.In this paper,we have prepared graphene oxide-based composite membrane material and researched the feasibility of the practical application in wastewater treatment.The main contents are as follows:(1)We use the titanate nanofibers(TNF)to assemble into a filter membrane with a larger pore size and take graphene oxide(GO)as an auxiliary material to modify the inorganic nanofibers.By adding a proportion of GO,it can be dispersed into the fibrous membrane uniformly.Some of the interconnected and open channels in the as-obtained membranes may be segmented and cut off during the membrane assembly process,which would change the construction of these channels and reduce the pore size distribution of the formed fiber membranes.In addition,the embedded contents of GO sheets in films and thickness of as-assembled membranes can be adjusted facilely,endowing such composite films with good processability.That embedding GO sheets into these fiber membranes can efficiently improve the filtration separation performance of these fiber membranes.At the same time,these GO-embedded TNF membranes also display superior selective separation performance on filtrating the mixture solutions of such two dyes,making these hierarchical membranes more flexible and versatile in water treatment areas.(2)We use the two-dimensional structure of graphene oxide(GO)supporting P25 nanoparticles and Ag particles to form GO-P25@Ag composite,which further develops to GO-P25@Ag composite membrane.The addition of P25 and Ag particles increase the two-dimensional channel in the composite membrane and improve the permeability of the composite membrane,while giving the membrane a certain degree of photocatalytic performance.In the paper,the oil/water separation experiment was carried out by using the as-prepared GO-P25@Ag composite membrane to improve the efficiency of oil/water separation under light conditions,indicating the composite membrane has a stronger oleophobic ability in the sense of oil/water separation.