Microporous membranes of low-high density polyethylene and their blends were prepared bythermally-induced phase separation of polymer/long-aliphatic chain alcohol (diluent) mixtures.The microstructures of this particu...Microporous membranes of low-high density polyethylene and their blends were prepared bythermally-induced phase separation of polymer/long-aliphatic chain alcohol (diluent) mixtures.The microstructures of this particular membrane, which depends on the diluent properties,polymer concentration and cooling rate, were observed by scanning electron microscopy.'Beehive-type,'leafy-like, and lacy porous structure morphologies can be formed,depending onthe blend composition and phase separation conditions, which were discussed by the polymer anddiluent crystallization processes.展开更多
Pervaporation desalination has a unique advantage 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 polye...Pervaporation desalination has a unique advantage 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 polyethylene microfiltration membrane as the substrate and deposited a glutaraldehyde crosslinked sodium carboxymethylcellulose layer by spray-coating.Pervaporation flux of the composite membrane reached 352 kg·m^(-2)·h^(-1) 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.展开更多
文摘Microporous membranes of low-high density polyethylene and their blends were prepared bythermally-induced phase separation of polymer/long-aliphatic chain alcohol (diluent) mixtures.The microstructures of this particular membrane, which depends on the diluent properties,polymer concentration and cooling rate, were observed by scanning electron microscopy.'Beehive-type,'leafy-like, and lacy porous structure morphologies can be formed,depending onthe blend composition and phase separation conditions, which were discussed by the polymer anddiluent crystallization processes.
基金funded by the National Natural Science Foundation of China(Grant No.51773011).
文摘Pervaporation desalination has a unique advantage 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 polyethylene microfiltration membrane as the substrate and deposited a glutaraldehyde crosslinked sodium carboxymethylcellulose layer by spray-coating.Pervaporation flux of the composite membrane reached 352 kg·m^(-2)·h^(-1) 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.
