Journal
LANGMUIR
Volume 37, Issue 20, Pages 6337-6346Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.1c00929
Keywords
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Funding
- National Natural Science Foundation of China [51772130, 51972145]
- Independent Innovation Team from Ji Nan Science AMP
- Technology Bureau [2019GXRC016]
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Surface heterostructures of 2D/2D MoS2/g-C3N4 (MCN) were successfully created through second thermal polymerization and chemical reaction, showing excellent performance in removing Cr(VI) and converting it to non-toxic Cr(III) through photoreduction. Adsorption and photoreduction were combined to achieve the outstanding removal of Cr(VI) in MoS2/g-C3N4 nanocomposites.
2D/2D MoS2/g-C3N4 (MCN) surface heterostructures were created by second thermal polymerization of bulk g-C3N4 and the reaction of thiourea and MoO3 at 670 degrees C. MoS2 networks grew vertically along the (002) facet on superior thin g-C3N4 nanosheets. The layered heterostructures drastically improved the Cr(VI) removal ability. In the dark case, 27% of Cr(VI) was removed within 45 min. The result indicates that the adsorption of Cr(VI) was a chemical adsorption process involving the sharing and transfer of electrons. The equilibrium data indicate that the adsorbent was covered with a monolayer adsorbate, which conformed to the Langmuir isotherm model (R-2 = 0.9618). In addition, MCN nanocomposites could convert Cr(VI) into non-toxic Cr(III) by photoreduction under visible light irradiation. With an optimized composition, 100% of Cr(VI) was removed within 30 min, which was similar to 10 times quicker compared with Cr(VI) removal under dark conditions. Because g-C3N4 nanosheets (sample CN670) with higher photocurrent density revealed the lowest photoreduction Cr(VI) ability, adsorption plays an important role in Cr(VI) removal. For MoS2/g-C3N4 nanocomposites used in Cr(VI) removal, adsorption and photoreduction were incorporated together to get excellent performance.
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