Efficient removal of Cr(VI) from wastewater using magnetically separable poly(m-phenylenediamine) particles

Abstract

Abstract The magnetic polymer adsorbent Fe3O4@poly (m-phenylenediamine) (Fe3O4@PmPD) was formed at room temperature (25°C) by chemical oxidative polymerization using Fe3O4 and m-phenylenediamine (mPD). The effects of the Na2CO3 concentration and Fe3O4 mass used in the synthesis on the adsorption capacity were studied. The effects of contact time, initial concentration and temperature on adsorption were individually analyzed. The equilibrium data were evaluated by kinetic and thermodynamic models. The highest adsorption capacity of the material was 654.4 mg/g at room temperature and pH=2. Finally, the recyclability of the materials was tested by cycling experiments. The material could be recycled and retained 73.18% of its initial adsorption capacity after 5 cycles. The magnetic polymer material exhibits excellent hexavalent chromium removal capacity and broad application prospects in the treatment of chromium-containing wastewater.