In order to effectively separate and recover dyes and salts from dye-containing wastewater,PVDF composite loose nanofiltration membrane is prepared via interfacial polymerization method with polyvinylidene fluoride(PVDF)ultrafiltration membrane as the matrix membrane,dopamine(DA),tannic acid(TA)and polyethyleneimine(PEI)as the co-deposit substances,and trimesoyl chloride(TMC)as the organic phase.The influences of the mass concentration ratios of DA to TA and PEI to TA on the structure and performance of PVDF composite loose nanofiltration membrane and the effect of treating simulated RB5 dye-containing wastewater by the membrane are evaluated.The membrane shows the best performance when ρ(DA)/ρ(TA)and ρ(PEI)/ρ(TA)are 2/8 and 4/6,respectively,over which the pure water flux is 36%and 113%,respectively higher than that over the membrane without TA.The flux of the simulated RB5 dye-containing wastewater is also 37%and 87%,respectively higher.The retention rates of dye are 95.5%and 95.4%,respectively,and those of salt(NaCl)are 3.95%and 3.15%,respectively.It is identified that PVDF composite loose nanofiltration membrane has good stability in the treatment of simulated RB5 dye-containing wastewater.
NETL
NSTL
万方数据
