Advanced oxidation catalyst prepared from manganese slag and sewage sludge to remove bisphenol A efficiently

Preparation of sulfate radical based advanced oxidation (SR-AOPs) catalysts is usually time-consuming and expensive. In this study, a new type of activator (MBA₈₀₀) for persulfate (PMS) was constructed by composite modification of electrolytic manganese slag and sludge. Firstly, the impurities in manganese slag and sludge were removed by chemical modification. After roasting at high temperature, hierachical pores appeared and the specific surface area of the catalyst increased. The catalyst could activate and catalyze the PMS to generate a large number of free radicals including sulfate radical (SO₄^-·), hydroxyl radical (·OH) and superoxide radical (·O₂^-), as well as the single oxygen (¹O₂). Within 60 min, the removal rate of 20 mg/L bisphenol A (BPA) reached to 100% through the synergistic effect of adsorption and degradation. In this paper, MBA₈₀₀ was used to activate PMS and remove BPA oxidation, and the adsorption behavior of BPA on MBA₈₀₀ was also studied. Moreover, the effects of initial concentration of MBA₈₀₀, pH, PMS concentration and environmental conditions on the degradation of BPA were discussed. This study provides a new idea for the development of novel advanced oxidation catalysts with the advantages of high efficiency and easy preparation for composite modification of MS and SS.