College of Chemistry and Chemical Engineering, Inner Mongolia University, Inner Mongolia, 010021, China.
College of Chemistry and Chemical Engineering, Inner Mongolia University, Inner Mongolia, 010021, China.
Environ Res. 2020 Nov;190:110010. doi: 10.1016/j.envres.2020.110010. Epub 2020 Aug 5.
MoS nanosheet-decorated TiO 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% MoS/TiO-based MFC was 3.7 and 1.9 times higher than that of blank graphite and TiO-based MFC, respectively. This MFC achieved 99.57% removal of Cr (VI) with a concentration of 20 mg L within 8 h under visible light illumination at pH 2 and high degradation rate of 2.49 g m h. The introduction of MoS 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 MoS 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 MoS/TiO photocathode. On the basis of its facile and scalable synthetic strategy as well as its stable and outstanding photoelectrocatalytic performance for MFC, this MoS/TiO nanocomposite showed potential in the efficient treatment of wastewater.
通过天然辉钼矿的液相剥离与原位水解相结合的方法制备了 MoS 纳米片修饰的 TiO 纳米复合材料。这些材料首次被用作微生物燃料电池 (MFC) 的光阴极，用于还原六价铬 (Cr(VI))。结果表明，在 pH 值为 2 且可见光照射下，浓度为 20mg/L 的 Cr(VI) 在 8 小时内的去除率达到 99.57%，其降解速率为 2.49g·m-3·h-1，负载 1wt% MoS 的 TiO2 基 MFC 的最大功率密度分别比空白石墨和 TiO2 基 MFC 提高了 3.7 和 1.9 倍。作为助催化剂，MoS 纳米片的引入可以扩展可见光的吸收，从而增加电子参与 Cr(VI)还原的比例。此外，适量的 MoS 纳米片也有助于电子迁移和增加活性位点。MFC 的功率输出和 Cr(VI)还原效率的提高归因于生物阳极和 MoS/TiO 光阴极之间的协同耦合。基于其简便且可扩展的合成策略，以及在 MFC 中稳定且出色的光电催化性能，这种 MoS/TiO 纳米复合材料在高效处理废水方面具有潜力。
