Abstract
The Z-scheme heterostructures NH2-MIL-125(Ti)/SnS2(NTS) with mesoporous bulk characteristics were constructed by the introduction of amino group and supported by NH2-MIL-125(Ti). The prepared heterojunction photocatalysts exhibited good photocatalytic performance and cycle stability for hexavalent chromium reduction, and the NTS-2(the mass ratio of NH2-MIL-125(Ti): SnS2 = 1: 40) had the highest catalytic activity at pH = 3.5 and 0.5 g/L dosage, in which 98.45% Cr(VI) (10 mg/L) could be reduced within 30 min of irradiation time. The introduction of SnS2 nanosheets not only improves the visible light response range of NH2-MIL-125 (Ti), but also generates more photogenerated carriers. Meanwhile, the formation of Z-scheme heterostructures between the two monomers greatly promoted the charge separation. In conclusion, this study would provide a potential pathway for the construction of heterojunction photocatalysts of metal sulfides and metal-organic framework materials for the removal of heavy metals from wastewater.
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