Synthesis Of TiO₂ Modified Functional Membrane And Its Oil-Water Separation Performance

With the rapid development of global industry and economy,large amounts of oily wastewater generated in the production process of metallurgical,textile,leather and food industries,as well as oily wastewater caused by sudden oil spills during oil exploration and transportation,are The ecological environment and even human health have caused great harm.Therefore,how to effectively treat oily wastewater and sewage has become an important research topic with extraordinary significance and is imminent.Traditional oil-water separation methods generally have disadvantages such as low separation efficiency,incomplete separation,and lengthy and time-consuming separation processes.Membrane separation technology has received widespread attention in recent years due to its green environmental protection.Among them,the design and synthesis of oil-water separation membranes are used in separation technology is very important.In this thesis,a flexible carbon cloth is used as a matrix to construct a transition metal-doped TiO₂-based oil-water separation modified membrane based on visible light responsiveness.The structure and oil-water separation performance of the membrane are studied,and the adjustment of transition metal doping concentration and membrane oil-water separation performance is discussed.relationship.The main contents are as follows:（1）First,the X-TiO₂/CC（X=Mn,Co,Fe）modified membrane doped with different transition metal elements was synthesized by hydrothermal method,and the doping concentration of each element was adjusted to optimize its oil-water separation performance.The study found that:synthetic membranes have superhydrophilic,underwater and superoleophobic properties,and have good self-cleaning performance under visible light driving;the types and doping concentrations of transition metal elements have a great influence on the oil-water separation performance of synthetic membranes.The separation test found that 3%Mn-TiO₂/CC,6%Co-TiO₂/CC,5%Fe-TiO₂/CC have the best performance in their respective systems,and their contact angle and separation efficiency are 146.5°,155°,156°and 99%,99.06%,99.19%,respectively.In addition,the separation efficiency of 3%Mn-TiO₂/CC membrane in a variety of oil-water mixtures is above 95%,and the separation efficiency is still around98%after 60 cycles of separation test;The separation efficiency of 6%Co-TiO₂/CC and5%Fe-TiO₂/CC in a variety of oil-water mixtures is above 97%,and the separation efficiency of 6%Co-TiO₂/CC and 5%Fe-TiO₂/CC after the cycle separation test are both above 98%.The important thing is that the synthetic membrane has good reusability,mechanical properties and chemical durability,and has great potential in the practical application of oil-water separation.（2）A simple hydrothermal method was used to synthesize a modified TiO₂/CC membrane co-doped with Mn and Fe.The effects of transition metal doping mode and doping concentration on the structure,morphology and oil-water separation performance of the synthesized membrane were mainly studied.On the basis of the optimal ratio of Fe doping,the modified membrane with the best performance was obtained by adjusting the doping concentration of Mn,and the effect of co-doping of transition metal elements on the oil-water separation performance of the TiO₂modified membrane was explored.Studies have shown that co-doping can improve the oil-water separation performance of the TiO₂modified membrane more than single-element doping.The specific performance is that the contact angle is 161°,and the separation efficiency is as high as 99.76%;under the visible light drive,after 60 cycles of separation test The separation efficiency of more than 99%can still be maintained;after bending and abrasion test of the modified membrane,the separation efficiency of the modified membrane is still more than 98%.It can be seen that the membrane has a good application prospect in the field of oil-water separation.