T he preparation of environmentally friendly oil/water separation materials remains a great challenge.Freeze-drying of wood after lignin removal yields wood aerogels,which can be used as substrates to prepare fluorine-free environmentally friendly superhydrophobic materials,However,they are more suitable for absorption rather than filtration applications due to their poor strength.A study using cross-sections of pristine wood chips as substrates retains the original strength of wood,but the use of the cross-sectional of wood pieces limits their thickness,strength,and size.In this paper,a degradable fluorine-free superhydrophobic film(max.water contact angle of appro-ximately 164.2°)with self-cleaning and abrasion resistance characteristics was prepared by a one-step method using pristine and activated walnut longitudinal section films as the substrate,with tetraethyl orthosilicate as a precursor and dodecyltriethoxysilane as a modifier.The tensile strength results show that superhydrophobic films with pristine or activated wood substrates maintained the streng-th of pristine wood and were 2.2 times stronger than the wood aerogel substrate.In.addition,after cross-laminating the two samples,the films had the ability to separate oil and water by continuous filtration with high efficiency(98.5％)and flux(approximately 1.3×103 L.m-2·h-1)The method has potential for the large-scale fabrication of degradable superhydrophobic filtration separation mem-branes.

Tong Xing;Changqing Dong;Xiaodong Wang;Xiaoying Hu;Changrui Liu;Haiyang Lv

National Engineering Laboratory for Biomass Power Generation Equipment,School of New Energy,North China Electric Power University,Beijing 102206,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;National Energy Biological Power Generation Group Corporation LTD,Beijing 100052,China

化学科学与工程前沿

[1]Tong Xing;Changqing Dong;Xiaodong Wang;Xiaoying Hu;Changrui Liu;Haiyang Lv-.Biodegradable,superhydrophobic walnut wood membrane for the separation of oil/water mixtures)[J].化学科学与工程前沿,2022(09):1377-1386

ximately,dodecyltriethoxysilane,streng

Biodegradable,superhydrophobic,walnut,wood,membrane,separation,oil,water,mixtures,preparation,environmentally,friendly,materials,remains,great,challenge,Freeze,drying,after,lignin,removal,yields,aerogels,which,can,be,used,substrates,fluorine,free,However,they,more,suitable,absorption,rather,than,filtration,applications,due,their,poor,strength,study,using,cross,sections,pristine,chips,retains,original,but,sectional,pieces,limits,thickness,size,In,this,paper,max,contact,angle,self,cleaning,abrasion,resistance,characteristics,was,prepared,by,one,step,method,activated,longitudinal,films,tetraethyl,orthosilicate,precursor,modifier,tensile,results,show,that,maintained,were,times,stronger,addition,laminating,two,samples,had,ability,separate,continuous,high,efficiency,flux,approximately,has,potential,large,scale,fabrication,branes

0.530352