Adsorptive removal of indomethacin and diclofenac from water by polypyrrole doped-GO/COF-300 nanocomposites

Recently, aqueous organic contaminants such as antibiotic are a problem worldwide because of the adverse health impacts and potential ecotoxicology. Nanocomposites-based adsorption has been considered as one of the most promising methods for treating organic contaminants in water. Here, an effective adsorbent of polypyrrole doped GO/COF-300 (GO/COF-300/PPy) nanocomposite was prepared for the first time. The characteristic of the GO/2COF-300/4PPy nanocomposites implied that the absorbent was a mesoporous material with a porous structure. Additionally, the GO/2COF-300/4PPy nanocomposites were applied for the removal of indomethacin (IDM) and diclofenac (DCF) from aqueous solution as an effective adsorbent. The adsorption characteristics and mechanism of GO/2COF-300/4PPy nanocomposites were explored. With fast adsorption equilibrium (60 min), the adsorbents showed high adsorption capacity both for IDM (115 mg/g) and DCF (138 mg/g) under natural pH condition. The adsorption kinetics and process conformed to the pseudo-second-order model and Langmuir isotherm model. Furthermore, there was no obvious effect on the adsorption performance of GO/2COF-300/4PPy nanocomposites with high concentration of humic acid in the environment. With good reusability, the GO/2COF-300/4PPy adsorbents still maintained higher removal efficiency both for IDM (72%) and DCF (68%) after 8 cycles of regeneration. The bacterial activity experiments demonstrated that the GO/2COF-300/4PPy nanocomposites were effective to remove IDM and DCF from aqueous solution. This study suggests the potential application of GO/2COF-300/4PPy nanocomposites in the water environmental remediation.