Abstract
Industrial development has led to the discharge of wastewater containing hexavalent chromium (Cr(VI)) and the accumulation of phosphorus‑iron (Fe–P) slag, which pose a threat to the ecological environment and human health. In this paper, we report an approach for resourceful utilization of industrial waste, the FeP slag is used as a reducing agent for the reduction of Cr(VI) in wastewater, realizing the complete removal of Cr(VI). The reaction thermodynamics between Cr(VI) and FeP slag was first studied in the range of 0 to 100 °C, the negative Gibbs free energy indicates a spontaneous reaction between Cr(VI) and FeP slag with an exothermic process. Experimental study showed that Cr(VI) can be completely removed through the reduction of Cr(VI) by FeP slag, and the temperature and dosage of FeP slag had a remarkable effect on the reaction kinetics and removal efficiency. In addition, the apparent activation energy and apparent frequency factor of Cr(VI) reduction were calculated (46.6 kJ/mol and 1.52 × 106 min−1). Based on above results, a simplified industrial procedure was proposed for Cr(VI) removal by constructing a self-heating system without additional power input. This paper concludes that FeP slag can be used as a reducing agent for Cr(VI) removal, providing a feasible pathway for the resourceful utilization of industrial waste.
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