Preparation\nof Microelectrolysis Filler Using Coal\nSlag for the Removal of Hazardous Substances in Contaminated Water

Presently, the utilization of gasification\nslag in the\ncontext\nof wastewater treatment is constrained. Furthermore, the presence\nof dye wastewater and wastewater containing hazardous metals represents\na significant threat to human health. Accordingly, the present study\nprepared a microelectrolytic filler (MF) from gasification slag via\na high-temperature roasting method and evaluated its degradation performance\nin water containing organic matter and harmful metal ions. The impact\nof varying preparation conditions, including initial solution pH and\nMF dose, on the degradation process was examined. The removal of methyl\nblue was found to be 92.21% at an initial pH of 2, a reaction time\nof 300 min and a dosage of 40 g L<sup>–1</sup>. The removal\nof Cu(II), Cd(II), and Pb(II) metal ions was 97.32, 96.58, and 99.38%,\nrespectively, at an initial pH of 4, a reaction time of 180 min, and\na dosage of 10 g L<sup>–1</sup>. Following five cycles, the\nMF process demonstrated continued efficacy in the removal of dyes\nand heavy metals from the wastewater. A mechanistic analysis revealed\nthat the water treatment process is not a single adsorption process.\nInstead, it was found that organic macromolecules undergo chain-breaking\nreactions, while heavy metal ions undergo redox reactions. The wastewater\ntreatment process comprises a number of distinct strategies, including\nelectrochemical reactions, adsorption, flocculation, and precipitation.\nThese findings illustrate the potential of a gasification slag green\nrecycling approach to treat waste with waste, in alignment with the\nprinciples of sustainable development.