High-valent cobalt–oxo complexes are reactive transient intermediates in a number of oxidative transformation processes e.g., water oxidation and oxygen atom transfer reactions. Studies of cobalt–oxo complexes are very important for understanding the mechanism of the oxygen evolution center in natural photosynthesis, and helpful to replicate enzyme catalysis in artificial systems. This review summarizes the development of identification of high-valent cobalt–oxo species of tetrapyrrolic macrocycles and N-based ligands in oxidation of organic substrates, water oxidation reaction and in the preparation of cobalt–oxo complexes.

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Water shortages caused by poor water quality severly affect the sustainable social and economic development of Tianjin City and Tangshan City in China. The Panjiakou Reservoir is located in the Luanhe River mainstream and provides water to the public in both cities since 1983. The evolution of water quality and aquatic community considering comprehensively the individual needs inside and across catchments to minimize trade-offs and maximize synergies was of great significance for coordinating the relations among society, economy, and water resources to achieve sustainable development at the sub-national scale.