| The interfacial reactivity of pyrite was researched from the perspective of crystal faces.To explore the effect of pyrite with different crystal faces on the bioleaching,and the mechanism of the effect of microorganisms on pyrite with different crystal faces to reduce Cr(VI),the conclusions of this paper are as follows:(1)The bioleaching effect of {100} and {210} with S.thermosulfidooxidans YN22 was measured to demonstrate that the pyrite crystal structures were associated with oxidation reaction rates and the corrosion mode was closely related to the crystal structure symmetry.The differences in the distribution and content of polysaccharides,proteins,and nucleic acids are attributed to the different atomic structures of {100} and{210}.The content and distribution of extracellular polymer components affected the bioleaching efficiency of pyrite with different crystal faces.(2)The synthesized {100} and {111} were high-purity pyrite and good electrical conductivity.The reduced Cr(VI)effect of {111} was higher than {100},which was attributed to the difference in shape structures and atomic arrangements between {100} and {111}.Density functional theory was utilized to compare the configurations of {100} and{111},theoretically verifying that {111} had excellent Cr(VI)reduce ability.The reduction mechanism of Cr(VI)in {100} is mainly reduction.In {111},the adsorption of Cr(VI)is stronger,which is more favorable for the reduction of Cr(VI).(3){100} and {111} synergistic crystal faces orientation 100 flora and111 flora were used to reduce Cr(VI).{111}+111+Cr(VI)existed the best ability to reduce Cr(VI),{100} had stronger bacteria-mineral synergy,while {111} was a bacterial group with strong domestication chromium reduction ability,the bacteria-mineral synergy was slightly worse.Because{111} existed the higher surface reactivity and the dominant populations of the crystal faces-directed enrichment system were different. |
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