Recovery of converter steel slag to prepare catalytic H2O2 degradation of dye wastewater as a catalyst

Whether steel slag or printing and dyeing wastewater not only pollutes the environment but also occupies a lot of land. In this paper, steel slag is pretreated by acid leaching method at normal temperature and pressure to obtain chlorinated steel slag solution system. Then the system is electrolyzed by an electrochemical membrane method to obtain polymetallic carbonate precipitation. The electrolytic product is used as a precursor to obtain polymetallic oxide by calcination. Simulated dye wastewater was degraded with hydrogen peroxide as oxidant and polymetallic carbonate and its oxide as the photocatalysts, and their catalytic performances were compared. The degradation rates of Ca/Mg/Fe/Al/Mn/Ti/CO3 and Ca/Mg/Fe/Al/Mn/Ti/O catalysts were 3.05 times and 2.91 times higher than that of the blank catalyst, respectively. Ca/Mg/Fe/Al/Mn/Ti/O showed the best degradation efficiency and the removal rate of MB is as high as 99.56% after 80 min of illumination. Considering that the material is derived from low-cost solid steel scrap slag, it can not only treat wastewater but also solve the problems of harmful accumulation of solid waste, so the prepared materials are environmentally friendly and economic photocatalytic materials for printing and dyeing wastewater.