Efficient adsorption and photocatalytic removal of tetracycline hydrochloride from heterojunction composite photocatalysts under visible light through multi-radical synergistic effects

초록

In response to the increasingly serious problem of ecological toxicity and the spread of antibiotic resistance genes caused by the persistent residue of tetracycline hydrochloride (TCH) in the environment, this work designed a composite material that effectively integrates photocatalytic and adsorption properties by taking the solubility of organic semiconductors. Compared with the fullerene derivative PPCBMB-based catalyst, the photocatalyst constructed by non-fullerene MeIC and donor PTQ10 exhibited excellent degradation performance and stability for TCH under visible light irradiation. It can completely remove the TCH solution of 5 mg L- 1 in actual environmental within 25 min, and the removal rate can reach 97.13% within 60 min in the 20 mg L- 1 highconcentration TCH. PTQ10:MeIC not only maintained high activity in a wide pH range of 3 to 7, but also retained a degradation efficiency of over 90% after continuous recovery for 25 times. Mechanism research indicated that its outstanding performance is attributed to enhanced light absorption, efficient charge separation and transport ability of PTQ10:MeIC, which promoted the degradation mechanism dominated by & sdot;OH and the cooperation of multi-free radicals. Moreover, the degradation process effectively reduced the environmental risks of intermediate products. This work provides an efficient, environmentally and friendly solution to antibiotic pollution.

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