HIGHLIGHTS • The preparation methods, basic structure, and properties as well as environmental instability and passivation techniques of twodimensional black phosphorus are systematically summarized and analyzed. • The application of anode materials based on two-dimensional black phosphorus in lithium-ion batteries in recent years is wholly reviewed. ABSTRACT Two-dimensional black phosphorus (2D BP), an emerging material, has aroused tremendous interest once discovered. This is due to the fact that it integrates unprecedented properties of other 2D materials, such as tunable bandgap structures, outstanding electrochemical properties, anisotropic mechanical, thermodynamic, and photoelectric properties, making it of great research value in many fields. The emergence of 2D BP has greatly promoted the development of electrochemical energy storage devices, especially lithium-ion batteries. However, in the application of 2D BP, there are still some problems to be solved urgently, such as the difficulty in the synthesis of large-scale high-quality phosphorene, poor environmental stability, and the volume expansion as electrode materials. Herein, according to the latest research progress of 2D BP in the field of energy storage, we systematically summarize and compare the preparation methods of phosphorene and discuss the basic structure and properties of BP, especially the environmental instability and passivation techniques. In particular, the practical application and challenges of 2D BP as anode material for lithium-ion batteries are analyzed in detail. Finally, some personal perspectives on the future development and challenges of BP are presented.

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The effect of CaCO3-Ni-MOF synthesized by different ratio between Ni2+ and organic ligand terephthalic acid on the removal of heavy metal ions was studied. CaCO3-Ni-MOF was synthesized by ultrasonic and solvothermal methods. The crystal structure and morphology of the material were characterized by XRD and SEM. TG curve was used to test the thermal stability of the material. In addition, the experimental study also found that CaCO3-Ni-MOF can remove heavy metal ions. The adsorption capacity of Cu2+ was found to be 16.96mg/100mg by energy spectrum analysis. And the amount of lead also has a certain amount of adsorption. The results show that the performance of the CaCO3-Ni-MOF material in the water environment has not been destroyed, and the heavy metal ions in the water can be effectively separated.