Abstract
Nanocubic MoS2-FeS2, as a photocatalyst, was synthesized with high catalytic active edges and high specific surface areas with the capability of absorbing visible light. The results showed that the photocatalytic efficiency of nanocubic MoS2-FeS2 for adsorption/degradation of methylene blue (MB) as well as the reduction of Cr(VI) was high. The adsorption process was found to follow a kinetic model of a pseudo-second-order kind (Qe.cal = 464 mg g-1) along with an isotherm described by the Langmuir model with Qe.cal = 340 mg g-1. The photodegradation process was achieved by holes. It was found that the photodegradation rate constant of MB by MoS2-FeS2 (0.203 min-1) was about 22 times higher than that of MoS2 (0.0091 min-1). The percent apparent quantum yield for photoreduction of Cr(VI) to Cr(III) using MoS2-FeS2 (5.7%) was about 33 times higher than utilizing MoS2 (0.1709%). Therefore, the synergistically prolonged visible-light harvesting as well as the photocarrier diffusion length proved that MoS2-FeS2 nanotubes can effectively be utilized in environmental pollutant's remediation.
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