Preparation method of Ti3C2TX MXene quantum dot (MQD)-modified polyamide (PA) reverse-osmosis (RO) membrane

A preparation method of a Ti3C2Tx MXene quantum dot (MQD)-modified polyamide (PA) reverse osmosis (RO) membrane, wherein T represents a functional group on a surface of a transition metal carbide (MXene) and comprises at least one of O, OH and F, 0<x<2;

• the preparation method comprises the following steps:
• S1:
• subjecting a Ti3C2Tx MXene material to liquid nitrogen intercalation and interlayer expansion to obtain a Ti3C2Tx MQD nanomaterial;
• S2:
• adding the Ti3C2Tx MQD nanomaterial to an aqueous polyamine solution to obtain an aqueous phase solution;
• S3:
• preparing an organic phase solution, wherein the organic phase solution is a polyacyl chloride solution;
• and
• S4:
• immersing an ultrafiltration (UF) base membrane in the aqueous phase solution, then removing the aqueous phase solution from a surface of the UF base membrane through blow-drying;
• immersing the UF base membrane in the organic phase solution to allow formation of an active layer on the UF base membrane through an interfacial polymerization reaction, resulting in a composite membrane;
• and allowing the composite membrane to stand, followed by subjecting it to a heat treatment to promote the interfacial polymerization reaction;
• wherein S1 comprises:
• S11:
• adding a Ti3AlC2 powder to an HF solution, and stirring a resulting mixture at 30° C. to 50° C. for 48 h to 72 h to perform etching and to obtain an etched powder;
• washing the etched powder repeatedly with deionized water and absolute ethanol until a pH of a resulting washing solution is higher than 6.5;
• and lyophilizing the resulting washing solution by conducting vacuum-drying at −70° C. to −90° C. for 12 h to 36 h to obtain the Ti3C2Tx MXene material powder;
• and
• S12:
• adding 1 g to 10 g of the Ti3C2Tx MXene material powder obtained in S11 to a polytetrafluoroethylene (PTFE) beaker, pouring 10 mL to 50 mL of liquid nitrogen into the beaker, and placing the beaker at room temperature for 3 min to 10 min;
• adding 30 mL to 50 mL of deionized water at 80° C. to 100° C. to the beaker to react for 3 min to 5 min, and stirring a resulting reaction mixture at room temperature for 24 h to 36 h;
• filtering the reaction mixture through a filter membrane with a pore size of 220 nm, and centrifuging a resulting filtrate at 10,000 r/min for 10 min to 30 min to obtain a Ti3C2Tx MQD solution;
• and lyophilizing the Ti3C2Tx MQD solution for 24 h to 48 h to obtain the Ti3C2Tx MQD nanomaterial.