Organic photoelectrocatalytic filtration membrane originated from PEDOT modified PVDF

A Poly 3, 4-ethylenedioxythiophene (PEDOT) modified polyvinylidene fluoride (PVDF) membrane with photoelectric activity was developed by chemical vapor deposition (CVD). Four kinds of membranes were prepared by 10-40% mass concentrations of FeCl3 center dot 6H(2)O oxidant. Modified membrane with 20% oxidant achieved the best performance with 0.07 e-5A photocurrent intensity. The highest removal ratio of tetracycline hydrochloride (TC, 92%), protein (90%), polysaccharide (57%) and humus (63%) were achieved under -1 V (Vs Ag/AgCl) and 210 W xenon lamp photoelectrocatalytic condition. Under optimized conditions, not only the 90% of TC and 80% of sodium humate were removed, but also the membrane flux maintained well during the 12 h continuous filtration tests. Free radicals of SO4-center dot, O-center dot(2-) and O-1(2) played a key role in the photoelectrocatalytic degradation. The carrier type of the membrane was changed from p-type to n-type after reaction because of the electron injection.

Automated summary

By doping FeCl3 into the PVDF membrane, a PEDOT-modified membrane with excellent performance was prepared, with the optimal oxidant concentration of 20%.