High-entropy alloy nano-powder as well as preparation method and application thereof

The invention provides high-entropy alloy nano powder as well as a preparation method and application thereof, and relates to a high-entropy alloy nano material. The high-entropy alloy nano-powder provided by the invention is FeNiCoCrY alloy and comprises the following components in percentage by atom: 15-20% of Fe, 35-40% of Ni, 15-20% of Co, 15-20% of Cr and 0.5-1.5% of Y. The preparation method comprises the following steps: adjusting a mixed solution containing Fe < 2 + >, Ni < 2 + >, Co < 2 + >, Cr < 3 + > and Y < 3 + > to be alkaline, adding a reducing agent, stirring for reaction, standing, cooling and separating to obtain the high-entropy alloy nano-powder. The high-entropy alloy element components are adjusted and combined, the nano-powder prepared on the basis of a liquid-phase reduction method has a higher specific surface area and a higher pore structure, azo dye wastewater and chromium ion wastewater can be degraded more strongly and more continuously, and meanwhile, the nano-powder has good cycl