Concrete chromium reducing agent

The invention discloses a concrete chromium reducing agent. A preparation method comprises the following steps: 1) preparing Ce-Ni composite oxide powder; 2) treating the Ce-Ni composite oxide powder with an aqueous solution of tris (hydroxymethyl) aminomethane, dopamine hydrochloride and boric acid, and then calcining in an argon protection atmosphere to obtain solid-phase powder A; 3) respectively adding 3-mercaptopropyltrimethoxysilane and ammonia water into an aqueous solution of ethanol to treat the solid-phase powder A so as to obtain solid-phase powder B; and 4) preparing an ethanol solution of tetraethylenepentamine, and treating the solid-phase powder B to obtain the concrete chromium reducing agent. The chromium removal agent prepared by the invention can obviously reduce the content of water-soluble chromium (VI) in concrete, reduce the toxicity of the concrete, reduce the pollution of the concrete to the environment or water, and improve the safety and practicability of the concrete. 本发明公开了一种混凝土降铬