Green synthesized superparamagnetic iron oxide nanoparticles for water treatment with alternative recyclability

•Simple and ecofriendly green synthesis of functionalized superparamagnetic iron oxide nanoparticles.•Nanoparticles absorbed the model dyes above 80% efficiency for a wide range of conditions and 94% for optimum conditions.•We present a successful recyclability by growing the nanoparticles on the surface of polyvinyl alcohol solid support.