Designing 3D-MoS 2 Sponge as Excellent Cocatalysts in Advanced Oxidation Processes for Pollutant Control.

3D-MoS ₂ can adsorb organic molecules and provide multidimensional electron transport pathways, implying a potential application for environment remediation. Here, we study the degradation of aromatic organics in advanced oxidation processes (AOPs) by a 3D-MoS ₂ sponge loaded with MoS ₂ nanospheres and graphene oxide (GO). Exposed Mo ⁴⁺ active sites on 3D-MoS ₂ can significantly improve the concentration and stability of Fe ²⁺ in AOPs and keep the Fe ³⁺ /Fe ²⁺ in a stable dynamic cycle, thus effectively promoting the activation of H ₂ O ₂ /peroxymonosulfate (PMS). The degradation rate of organic pollutants in the 3D-MoS ₂ system is about 50 times higher than without cocatalyst. After a 140 L pilot-scale experiment, it still maintains high efficiency and stable AOPs activity. After 16 days of continuous reaction, the 3D-MoS ₂ achieves a degradation rate of 120 mg L ^-1 antibiotic wastewater up to 97.87 %. The operating cost of treating a ton of wastewater is only US$ 0.33, suggesting huge industrial applications.
(© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)