Patent ID: 11912803
Assignee: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Chemical engineering (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 4:
5. A method for manufacturing a conjugated polyelectrolyte-grafted membrane, comprising the steps of:
preparing a conjugated polyelectrolyte (CPE);
coating the conjugated polyelectrolyte (CPE) on a surface of a membrane, wherein the membrane is a polyvinylidene fluoride-based (PVDF-based) material;
dipping the membrane in a mixed solution containing an alkaline solution and ethanol to form an alkene group (CnH2n) and hydroxyl group (OH−) on the surface of the membrane;
carrying out crosslinking of the conjugated polyelectrolyte (CPE) with the surface of the membrane;
substituting a halide ion of the conjugated polyelectrolyte (CPE) crosslinked to the surface of the membrane with a hydroxide ion (OH−); and
substituting another halide ion of the conjugated polyelectrolyte (CPE) crosslinked to the surface of the membrane with acetate (CH3COO−) or bis(trifluoromethanesulfonyl)imide ((CF3SO2)2N−);
wherein a material containing a crosslinkable functional group is introduced to a side chain of the conjugated polyelectrolyte (CPE), in the step of preparing a conjugated polyelectrolyte (CPE), and wherein the crosslinkable functional group is 1-vinylimidazole;
wherein the conjugated polyelectrolyte (CPE) is capable of generating active oxygen in water under visible light irradiation, in the step of preparing a conjugated polyelectrolyte (CPE);
wherein the conjugated polyelectrolyte (CPE) has visible light absorbing ability, and has a reduction potential of −0.57V or higher vs. a standard calomel electrode (SCE); and
wherein the step of carrying out crosslinking of the conjugated polyelectrolyte (CPE) with the surface of the membrane is carried out by dipping the membrane coated with the conjugated polyelectrolyte (CPE) in a solution containing an initiator dissolved therein, and heating the resultant mixture at a predetermined temperature to induce cross linking of the conjugated polyelectrolyte (CPE) with the surface of the membrane.