![]() ![]() Under simulated sunlight irradiation, photogenerated electron–hole pairs in the natural dolomite were separated and transferred to the surface, and then formed reactive radicals through further reactions, thereby enhancing the degradation of target compounds. As a result, natural dolomite could act as a semiconductor photocatalyst in photochemical reactions due to the substitution of Mg 2+ by Fe 2+. The first-principles calculations indicated that the isomorphous substitution of Fe 2+ for Mg 2+ in the dolomite lattice led to the impurity levels appearing in the forbidden band, which caused a significant decrease of the band gap from 5.02 to 1.63 eV. The EPR analysis demonstrated that O 2 −˙, ˙OH, and 1O 2 were produced in the dolomite system under simulated sunlight irradiation. The kinetic study showed that natural dolomite showed notable photocatalytic activity for the degradation of target compounds including methylene blue, diphenhydramine, and tetracycline. In this study, the photocatalytic activity of natural dolomite and its mechanism were investigated based on designed experiments and first-principles calculations. Mineral-based photocatalysts have received great attention due to their low cost.
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