Pervaporation desalination has a unique advan-tage to recycle concentrated salt solutions.The merit can be applied to treat alkaline wastewater if the membrane has superior alkali-resistance.In this paper,we used poly-ethylene microfiltration membrane as the substrate and deposited a glutaraldehyde crosslinked sodium carbox-ymethylcellulose layer by spray-coating.Pervaporation flux of the composite membrane reached 35±2 kg·m-2·h1 with a sodium chloride rejection of 99.9％±0.1％when separating a 3.5 wt-％sodium chloride solution at 70℃.The desalination performance was stable after soaking the membrane in a 20 wt-％NaOH solution at room temperature for 9 d and in a 10 wt-％NaOH solution at 60℃for 80 h.Moreover,the membrane was stable in 4 wt-％sulfuric acid and a 500 mg-L-1 sodium hypochlorite solution.In a process of concentrating a NaOH solution from 5 to 10 wt-％at 60℃,an average water flux of 23 kg.m 2.h 1 with a NaOH rejection over 99.98％was obtained.

Guiqin Bai;Jianzhong Xia;Bing Cao;Rui Zhang;Junquan Meng;Pei Li

College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Institute for Advance Study,Shenzhen University,Shenzhen 518060,China

化学科学与工程前沿

[1]Guiqin Bai;Jianzhong Xia;Bing Cao;Rui Zhang;Junquan Meng;Pei Li-.Fabrication of high-performance pervaporation composite membrane for alkaline wastewater reclamation)[J].化学科学与工程前沿,2022(05):709-719

carbox,ymethylcellulose

Fabrication,high,performance,pervaporation,composite,membrane,alkaline,wastewater,reclamation,Pervaporation,desalination,has,unique,advan,tage,recycle,concentrated,salt,solutions,merit,can,be,applied,treat,if,superior,resistance,In,this,paper,we,used,poly,ethylene,microfiltration,substrate,deposited,glutaraldehyde,crosslinked,sodium,layer,by,spray,coating,flux,reached,h1,chloride,rejection,when,separating,wt,stable,after,soaking,NaOH,room,temperature,Moreover,sulfuric,acid,hypochlorite,process,concentrating,from,average,obtained

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