Hydrophilic modification of polyvinylidene fluoride membranes by ZnO atomic layer deposition using nitrogen dioxide/diethylzinc functionalization

摘要: Abstract Thanks to the controllable deposition process, atomic layer (ALD) has been applied for hydrophilic modification of organic membranes. Sometimes enhanced hydrophilicity is at expense sacrificing membrane flux due granular deposits generated on hydrophobic pores. This study proposed an innovative process nitrogen dioxide (NO 2 ) and diethylzinc (DEZ) functionalization combined with Zinc oxide (ZnO) realize enhancement separation performance. Results showed that ultrathin “ZnO-like” was formed surface pore walls after 10 cycles NO DEZ using ALD, a more uniform conformal activated modification. More importantly, growth rate ZnO modified membranes higher than direct deposited After 200 ALD cycles, water contact angle decreased from 140° original 67° 20° respectively /DEZ further Furthermore, compared membranes, maximum 5261.4 L m −2  h −1  bar superior performance BSA retention 97% were achieved only 100 Further exploration mechanism indicated could accelerate subsurface nucleation layer. The pattern realized lower achieving improvement simultaneously. pretreatment method in this be great potential activation other