Polyphenol film deposited on platinum foil can continuously grow with time during the electrolysis of a phenol solution consisting of 0.1 mol L-1 phenol, 3 mol L-1 NaOH and 0.5 mol L-1 Na2SO4, as has been proved by th...Polyphenol film deposited on platinum foil can continuously grow with time during the electrolysis of a phenol solution consisting of 0.1 mol L-1 phenol, 3 mol L-1 NaOH and 0.5 mol L-1 Na2SO4, as has been proved by the methods of sweep potential, constant potential and constant current, and visible spectra during the electrolysis of phenol. A polyphenol film with thickness of 0.11 mm was obtained by the electrolysis of phenol at a constant potential of 0.70 V (versus Ag/AgCl with saturated KCl solution). Polyphenol film is inactive and stable in 2 mol L-1 H2SO4 solution, neutral solution and 3 mol L-1 NaOH solution and in the potential range between -0.95 and 1.35 V. The usable potential range is dependent on the pH value. Polyphenol has an ESR signal with a g factor of 2.0049. The conductivity of polyphenol is 1.2 x 10(-4) S cm(-1). In the solution of polyphenol dissolved in DMSO, the mobility of polyphenol anions is 8 x 10(-9) m(2) s(-1) V-1 at 20degreesC.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
基金This work was supported by the National Natural Science Foundation of China (No. 20074027).
文摘Polyphenol film deposited on platinum foil can continuously grow with time during the electrolysis of a phenol solution consisting of 0.1 mol L-1 phenol, 3 mol L-1 NaOH and 0.5 mol L-1 Na2SO4, as has been proved by the methods of sweep potential, constant potential and constant current, and visible spectra during the electrolysis of phenol. A polyphenol film with thickness of 0.11 mm was obtained by the electrolysis of phenol at a constant potential of 0.70 V (versus Ag/AgCl with saturated KCl solution). Polyphenol film is inactive and stable in 2 mol L-1 H2SO4 solution, neutral solution and 3 mol L-1 NaOH solution and in the potential range between -0.95 and 1.35 V. The usable potential range is dependent on the pH value. Polyphenol has an ESR signal with a g factor of 2.0049. The conductivity of polyphenol is 1.2 x 10(-4) S cm(-1). In the solution of polyphenol dissolved in DMSO, the mobility of polyphenol anions is 8 x 10(-9) m(2) s(-1) V-1 at 20degreesC.
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.
