Adsorption-Reduction of Cr(VI) with Magnetic Fe-C-N Composites

In this study, the iron-based carbon composite (hereafter FCN-x, x = 0, 400, 500, and 600 calcination) was synthesized by a simple high-temperature pyrolysis method using iron-containing sludge coagulant generated from wastewater treatment settling ponds in chemical plants. The FCN-x used for adsorptive reduction of aqueous phase Cr(VI) effectively. characterized scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier infrared spectrometer (FT-IR), photoelectron (XPS), Brunauer-Emmett-Teller theory (BET). adsorption examined batch experiments CrO42− as function physicochemical parameters. kinetics FCN-500 were modeled 1st 2nd order empirical pseudo kinetics. Based on these experiments, has been selected further studies reduction. maximum 52.63 mg/g showing highest removal efficiency. quantified Langmuir isotherm. XPS result confirmed to Cr(III) FCN-500. composites have high reusability application potential water treatment. electroplating with 117 mg/L treated FCN-500, 99.93% removed within 120 min, which is lower than national chromium emission standard People’s Republic China. This work illustrates value-added role dye plants ensure environmental sustainability.