Carboxymethyl-modified chitosan/yeast adsorbent as well as preparation method and application thereof

The invention belongs to the field of biological adsorption materials, and discloses a carboxymethyl-modified chitosan/yeast adsorbent as well as a preparation method and application thereof. The preparation method comprises the following steps of uniformly mixing and stirring the treated waste yeast powder and a chitosan solution; injecting the mixed solution into a NaOH (sodium hydroxide) solution to form fine fibers (CS/Y fibers), and soaking for 8 to 12h; enabling the CS/Y fibers to generate crosslinking reaction in ECH (epoxy chloropropane); modifying the crosslinked fibers in a chloroacetic acid solution; washing the modified fibers by water, and drying, so as to obtain the carboxymethyl-modified chitosan/yeast fiber (N-CMCS/Y). The surface of the N-CMCS/Y is rich in function groupswith stronger affinity to Mn(II); the good selective adsorption ability on the Mn(II) is realized; the Mn(II) can be easily eluted by sulfuric acid, and repeatedly utilized; the N-CMCS/Y can be applied to efficiently remove,