Polymer fibers are among the most promising adsorbents in wastewater treatment

while limited by poor adsorption capacity and irreversible pollution. Herein

amine-modified C

3

N

4

/TiO

2

-polyacrylonitrile (PAN) composite fibers with high absorption ability and photocatalytic self-cleaning properties were fabricated

via

wet spinning. The introduction of diethylenetriamine (DETA) onto the PAN resulted in the presence of positively charged amino groups

which not only increased the number of adsorption sites for anionic dyes but also facilitated the formation of a sponge-like pore structure. Optimally

the adsorption capacity of the aminated PAN fibers (PD7h) for methyl orange (MO) reached 164.79 mg·g

-1

which is 39.2 times greater than that of unmodified PAN fibers. Furthermore

the introduction of the C

3

N

4

/TiO

2

heterojunction photocatalyst endowed the fibers with photocatalytic self-cleaning capability by generating active free radicals (hydroxyl radicals (·OH) and superoxide radicals (·O

2

-

) that efficiently degraded dye pollutants

in situ

on the fiber surface. Under irradiation using a 300 W xenon lamp

the aminated C

3

N

4

/TiO

2

-PAN fibers (PDCT-1) removed more than 90% of MO (30 mg·L

-1

) within 120 min. After eight cycles

the pollutant removal rate decreased by only 22.41%

indicating excellent stabili

ty. Overall

this work presents an effective

simple and feasible method for preparing polymer fibers with high adsorption and photocatalytic self-cleaning properties

via

wet spinning for dye wastewater treatment.