Preparation And Properties Of Oil Absorbent Materials Based On Metaplexis Japonica Fiber

With the rapid development of the industrial economy,the production and demand of petroleum are increasing day by day.Water pollution caused by oil spills and chemical substance leaks causes a series of catastrophic harm to the ecological natural environment,but also endangers human health and leads to serious economic consequences.In order to protect the ecosystem,oil spills that frequently occur in the aquatic environment have become key issues that need to be addressed urgently.Therefore,it is of great practical significance to conduct research on oil-absorbing materials.Natural fiber materials have the advantages of oil absorption capacity,rich resources,renewable,biodegradable and so on.They have attracted widespread attention in the direction of solving oil pollution problems.Metaplexis japonica is a perennial plant belonging to the perennial grass vine of the genus Corydalis.Its fibers have a hollow structure,and the surface is hydrophobic and oleophilic.At present,there are few applications in the field of oil absorption.In order to develop the application of Metaplexis japonica fiber in the field of oil-water separation,the subject explores the oil absorption properties of Metaplexis japonica fiber and the development and preparation of new oil-absorbing materials based on Metaplexis japonica fiber.The main research results are as follows:(1)The oil absorption properties,hydrophobicity and lipophilicity of Metaplexis japonica fiber were studied in depth.Scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FTIR)analysis showed that the Metaplexis japonica fiber had a hollow tubular structure,was straight in the longitudinal direction,and was distributed with grooves.The main chemical components of Metaplexis japonica fiber are cellulose,lignin and hemicellulose,and the surface contains a hydrophobic wax layer.In the 60 s contact time,the Metaplexis japonica t fiber's water contact angle can reach 121° or more,and it has relatively stable hydrophobic performance.The contact angle with engine oil is 0 °,and it has good hydrophobic and lipophilic properties.The absorption capacity of Metaplexis japonica fiber assembly for various oils and organic solvents is 48.2 ~ 137.8 g/g,and it shows a high adsorption rate.Metaplexis japonica fiber can effectively recover oil and organic solvents on or below the water surface,and has good oil-water separation capabilities.After 7 cycles of use,Metaplexis japonica fiber still has good oil absorption properties.Metaplexis japonica fiber has high absorption capacity,environmental compatibility and good reusability.It has great potential as a natural oil absorbent.(2)The sodium chlorite was used to modify the Metaplexis japonica fiber,and the SC-MJFs aerogel was prepared by atmospheric drying.The SC-MJFs aerogel was hydrophobized by chemical vapor deposition.The effects of methyltrimethoxysilane dosage,modification time,and modification temperature on the hydrophobic properties of MTMS modified SC-MJFs aerogels were investigated.The optimal reaction conditions were 0.1 g SC-MJFs aerogels,200 ?L methyltrimethoxysilane and 600 ?L of deionized water were reacted at 70? for 2 h.SC-MJFs aerogel has good hydrophobicity after being modified by MTMS,and its contact angle with water reaches 135 °.The saturated adsorption capacity of MTMS modified SC-MJFs aerogel for silicone oil,dichloromethane,n-hexane,rapeseed oil and motor oil are 23.4 g / g,30.4 g / g,14.7 g / g,25.5 g / g and 24.3 g / g,showing high oil adsorption capacity and good oil / water selectivity.The structural stability of MTMS modified SC-MJFs aerogel should be further improved to improve its repeatability.