Tao Liyue, Wang Jun, Luo Zhaoyue, Ren Junjie, Yin Dongguang
School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.
Langmuir. 2023 Aug 15;39(32):11426-11438. doi: 10.1021/acs.langmuir.3c01295. Epub 2023 Aug 2.
As a promising catalyst, MoS has been widely studied owing to its high chemical reactivity, excellent electrical carrier mobility, good optical properties, and narrow band gap. However, the high recombination rate of photoinduced charge carriers limits its practical application in photocatalysis. In this study, MoS was coupled with PANI to fabricate an S-scheme heterojunction MoS/PANI. The synthesized products were characterized systematically, and their photocatalytic properties were evaluated by photocatalytic degradation of norfloxacin (NOR) and rhodamine B (RhB). The obtained results indicated that the fabricated MoS/PANI inorganic-organic heterojunction displayed tremendously enhanced photocatalytic activity. The degradation efficiencies for 60 mg L of NOR and RhB are 86 and 100% under the simulated sunlight irradiation for 1 h with 10 mg of catalyst, which are 13 and 47 times higher than those of pure MoS, respectively. Interestingly, it is superior to the previously reported related materials. The remarkably enhanced photocatalytic activity of MoS is assigned to the high charge conductivity feature of PANI and the formed S-scheme heterojunction that result in a steric separation of holes and electrons and conserve the initial powerful redox ability of the parent catalysts. This study provides a facile method to greatly improve the photocatalytic activity of MoS and facilitates its application for highly efficient removal of organic pollutants, such as antibiotic drugs and organic dyes, utilizing solar energy.
作为一种有前景的催化剂，二硫化钼（MoS）因其高化学反应活性、优异的电载流子迁移率、良好的光学性质和窄带隙而受到广泛研究。然而，光生载流子的高复合率限制了其在光催化中的实际应用。在本研究中，二硫化钼与聚苯胺（PANI）耦合制备了S型异质结MoS/PANI。对合成产物进行了系统表征，并通过光催化降解诺氟沙星（NOR）和罗丹明B（RhB）评估了它们的光催化性能。所得结果表明，制备的MoS/PANI无机-有机异质结表现出极大增强的光催化活性。在10 mg催化剂存在下，模拟太阳光照射1 h，60 mg/L的NOR和RhB的降解效率分别为86%和100%，分别比纯MoS高13倍和47倍。有趣的是，它优于先前报道的相关材料。MoS光催化活性的显著增强归因于聚苯胺的高电荷传导特性以及形成的S型异质结，这导致空穴和电子的空间分离，并保留了母体催化剂最初强大的氧化还原能力。本研究提供了一种简便的方法来大幅提高MoS的光催化活性，并促进其利用太阳能高效去除有机污染物，如抗生素药物和有机染料的应用。
