MoS₂ nanosheet-decorated TiO₂ nanocomposites were prepared via facile liquid-phase exfoliation of natural molybdenite combined with in situ hydrolysis route. These materials were used as a photocathode for the first time in microbial fuel cell (MFC) to reduce hexavalent chromium (Cr (VI)). Results showed the maximum power density of 1 wt% MoS₂/TiO₂-based MFC was 3.7 and 1.9 times higher than that of blank graphite and TiO₂-based MFC, respectively. This MFC achieved 99.57% removal of Cr (VI) with a concentration of 20 mg L⁻¹ within 8 h under visible light illumination at pH 2 and high degradation rate of 2.49 g m⁻³ h⁻¹. The introduction of MoS₂ nanosheets as a cocatalyst can expand the absorption of visible light, thereby leading to increased electronic participation in Cr (VI) reduction. Moreover, the appropriate amounts of MoS₂ nanosheets also contribute to electrons migration and additional active site. The enhanced power output and Cr (VI) reduction efficiency of MFC can be attributed to the synergistic coupling between bioanode and MoS₂/TiO₂ photocathode. On the basis of its facile and scalable synthetic strategy as well as its stable and outstanding photoelectrocatalytic performance for MFC, this MoS₂/TiO₂ nanocomposite showed potential in the efficient treatment of wastewater.

MoS ₂纳米片修饰的TiO ₂纳米复合材料是通过天然辉钼矿的液相液相剥离结合原位水解途径制备的。这些材料首次在微生物燃料电池（MFC）中用作光电阴极，以还原六价铬（Cr（VI））。结果表明，1 wt％MoS ₂ / TiO ₂基MFC的最大功率密度分别比空白石墨和TiO ₂基MFC高3.7倍和1.9倍。该MFC在pH 2的可见光照射下，在8 h内以20 mg L ^-1的浓度实现了99.57％的Cr（VI）去除，并且降解率高达2.49 g m ^-3  h ^-1。MoS ₂纳米片作为助催化剂的引入可以扩大可见光的吸收，从而导致电子参与Cr（VI）还原的增加。此外，适量的MoS ₂纳米片还有助于电子迁移和其他活性位点。MFC的增强的功率输出和Cr（VI）还原效率可归因于生物阳极与MoS ₂ / TiO ₂光电阴极之间的协同耦合。Mos ₂ / TiO ₂纳米复合材料基于其简便，可扩展的合成策略以及对MFC的稳定和出色的光电催化性能，显示出在废水的高效处理方面的潜力。