TiO2 anchored on porous ACCOF-on-UiO-66 composites for boosting photocatalytic degradation of tetracycline from water

To address the low visible-light absorption of titanium oxide (TiO 2 ) and the agglomeration tendency of covalent-organic-framework (COF), UiO-66 modified by amination was combined with acyl chloride covalent organic framework (AC COF) synthesized by ultrasonic assisted method to successfully form AC COF@UiO-66 core-shell structure. Subsequent TiO 2 loading formed a heterojunction that narrows the band gap, suppresses charge recombination, and extends visible-light absorption. Compared to AC COF, the adsorption performance of the TiO 2 /AC COF@UiO-66 increased by 7.4 times, reaching 432.9 mg/g. The active species that play a main part in the photocatalytic degradation process are h + and ·OH. Experimental results demonstrate that tetracycline (TC) can be entirely degraded within 40 min. In this work, the functional design of adsorption and photocatalysis was carried out on UiO-66 framework material, which overcame the limitations of individual component in the treatment of tetracycline wastewater and provided a new strategy for the design of ternary composite photocatalytic materials.