| abstract |
The invention discloses a carboxymethyl magnetic lignin-based biochar and a preparation method. Alkali lignin is used as a base material, and after being uniformly mixed with a magnetizing agent and a surfactant, it is heated at 350-450 DEG C under the protection of N After carbonization for 2 h, magnetic lignin-based biochar was formed, and then carboxymethyl magnetic lignin-based biochar was prepared by alkalization and etherification in a medium solution. The carboxymethyl content of the product of the present invention is 0.3 mmol·g - 1-1.2 mmol·g -1 , and the adsorption value to methylene blue is 294.9 mg·g - 1-432.0 mg·g -1 , which is obviously higher than that of commercially available activated carbon, and The specific surface area can reach 302.0 m 2 ·g ‑1 . In addition, the product has stable magnetic properties, the specific saturation magnetization is as high as 11.7 emu·g ‑1 , which can be separated by the magnetic separation method. In addition, the process of the invention is simple and the application prospect is broad. |