Preparation method of modified traditional Chinese medicine residue biomass adsorbent and application of modified traditional Chinese medicine residue biomass adsorbent in dye wastewater treatment

The invention provides a preparation method of a modified traditional Chinese medicine residue biomass adsorbent and an application of the modified traditional Chinese medicine residue biomass adsorbent in dye wastewater treatment. The method comprises the following steps that curcuma zedoary residue powder and a phosphoric acid solution are prepared according to the solid-to-liquid ratio of 1 g:7 mL to 1 g: 11 mL, the concentration of the phosphoric acid solution is 0.5 mol/L to 2.5 mol/L, and soaking is conducted for 1.5 h to 2.5 h under the condition that the temperature is 55 DEG C to 65DEG C; and washing with deionized water until the washing liquid is in a neutral state, suction filtration is performed, and drying is carried out in an electrothermal blowing dry box with the temperature of 75-85 DEG C to obtain the modified biomass adsorbent. The modified biomass adsorbent is put into dye wastewater, the pH value of the dye wastewater is adjusted to 6-8, and the temperature is controlled to 35-45 DEG C a