Efficient H 2 harvesting from wastewater instead of pure water can minimize fresh water consumption, which is expected to solve the problem of water shortage in H 2 production process and contribute to carbon neutrality in the environmental remediation, but the inevitable electron depletion caused by electron-consuming pollutants will result in an exhausted H 2 evolution reaction (HER) performance. In this paper, by coupling piezocatalysis and advanced oxidation processes (AOPs) by a MoS 2 /Fe 0 /peroxymonosulfate (PMS) ternary system, extensive types of wastewater achieved considerable H 2 generation, which exceeded the yield in pure water with synchronous advanced degradation of organic pollutants. In addition, profiting from the crucial bridging role of PMS, the H 2 yield in nitrobenzene wastewater after the introduction of PMS-based AOPs increased 3.37-fold from 267.7 μmol·g −1 ·h −1 to 901.0 μmol·g −1 ·h −1 because the presence of PMS both thermodynamically benefited MoS 2 piezocatalytic H 2 evolution and eliminated the electron depletion caused by organic pollutants. By this way, the original repressed H 2 evolution performance in substrate of wastewater not only was regained but even showed a significant enhancement than that in pure water (505.7 μmol·g −1 ·h −1 ). Additionally, the cyclonic piezoelectric reactor was preliminarily designed for future industrialization. This strategy provided a valuable path for the recycling of actual wastewater by fuel production and synchronous advanced treatment.

Many cities are suffering from severe air pollution from fine particulate matter. Cyclone is an effective separator for particulate pollutant but has low efficiency for those with an aerodynamic diameter of 2.5 μm or less (PM). In this research, four novel inlet particle-sorting cyclones were first developed to enhance the separation of PM. The energy consumption, overall separation efficiency, particle grade efficiency,outlet particle concentration and size distribution were compared with common cyclone (CM-C). It was found that the vertical reverse rotation cyclone (VRR-C), which made the smaller particles enter cyclone from radially outer side and axially lower side at the rectangular inlet, had the best separation performance, especially for PM separation. The mean diameter of inlet particles was 15.7 μm and the particle concentration was 2000 mg/m, the overall separation efficiency of the VRR-C reached 98.3%, which was 6.4% higher than that of CM-C. PM grade efficiency of the VRR-C exceeded 80%, which was 15∼20% higher than that of CM-C. The PM content at the VRR-C outlet was 30.8 mg/m, while that of CM-C was still 118.4 mg/m. The novel inlet particle-sorting cyclone is an effective separation enhancement for PM source control in the process of industrial production and environment protection.

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