Polypyrrole-functionalized magnetic Bi2MoO6 nanocomposites as a fast, efficient and reusable adsorbent for removal of ketoprofen and indomethacin from aqueous solution

Abstract

Pharmaceutical and personal care products (PPCPs) as emerging organic pollutants have received widespread attention. A novel composite adsorbent was successfully prepared through the modification of polypyrrole (PPy) onto the surface of magnetic Bi2MoO6 (MnFe2O4/Bi2MoO6/PPy) and acted as excellent adsorbent to remove organic compounds from aqueous solution. The adsorbent was characterized by SEM, TEM, FT-IR, XRD, BET, VSM, XPS and PES. The resulting composites combined the advantages of all three parts and possessed porous structure and magnetic properties, which showed excellent adsorption performance for ketoprofen (KET) and indomethacin (IDM), as evidenced by 87.03% and 86.24% of removal in just 120 min at initial concentration of 10 mg/L, respectively. The adsorption processes of MnFe2O4/Bi2MoO6/PPy for PPCPs were well fitted with the pseudo-second order kinetic model and described better by Langmuir isotherm model. The possible adsorption mechanisms of KET and IDM by MnFe2O4/Bi2MoO6/PPy were provided. Additionally, the effect of other coexisting substances was also explored using Cu2+ as a model. Moreover, the adsorption performances were further studied to remove several dyes, in which showed superior affinity for anionic dyes. In practical application, it had almost equal removal capacity for KET both in the Yellow River water and sewage treatment plant inlet water.