Abstract
In this study, the magnetic composite particles composed of marcasite, pyrite, and magnetite were prepared with the hydrothermal process and oxidation. The coexistence of marcasite and pyrite was achieved by controlling the sulfur content in the hydrothermal process, and surface magnetite was realized by controllable oxidation. The typical composite particles presented the regular spherical size of 5 to 7 μm and could degrade 41.2 % MO as well as reduce 98 % Cr(VI). In the mixed solution of MO/Cr(VI), the synergistic degradation rate of MO increased from 41.2 % to 70.5 % and the reduction rate of Cr(VI) could still reach 98 %. Multiphase recombination could increase Fe adsorbed on the material surface and construct the p-n junction. In addition, surface magnetite endowed the material with magnetic recyclability. In situ multiphase recombination turned cheap FeS2 into a valuable treatment agent for mixed pollutants.
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