▎ 摘　　要

NOVELTY - Preparation of methylene blue adsorbent, involves (i) crushing shell, sieving, adding hydrochloric acid, curing, rinsing with water until neutral, drying, (ii) formulating graphene oxide solution, adding polyethylene glycol, ultrasonically dispersing to obtain graphene oxide dispersion, (iii) placing dried material into a graphene oxide dispersion, stirring, adding zinc chloride, performing hydrothermal reaction, cooling, adding glucose, stirring, freeze-drying to obtain aerogel, (iv) placing aerogel in a tube furnace, preheating, increasing temperature, heat-preserving and cooling. USE - Preparation of adsorbent for absorbing methylene blue in printing and dyeing wastewater. ADVANTAGE - The adsorbent raw material and preparation method are environmentally-friendly. The resulting adsorbent has stable performance, large surface area, and high methylene blue removal rate in printing and dyeing wastewater. DETAILED DESCRIPTION - Preparation of methylene blue adsorbent, involves (i) crushing shell, sieving, adding hydrochloric acid with concentration of 10-12%, curing, then rinsing with water until neutral, drying to obtain dried material, where the shell is almond shell, longan shell and/or Litchi shell and the ratio of shell and hydrochloric acid is 4-5:20 g/ml, (ii) adding deionized water to graphene oxide, formulating into 8-10 g/L graphene oxide solution, then adding polyethylene glycol, ultrasonically dispersing for 2-4 hours to obtain graphene oxide dispersion where the mass ratio of polyethylene glycol and graphene oxide is 1:5-10, (iii) placing the dried material into a graphene oxide dispersion, stirring evenly, then adding zinc chloride, placing in a reaction kettle, carrying out hydrothermal reaction at 120-140 degrees C for 7-10 hours, cooling, adding glucose, stirring, and then freeze-drying for 10-20 hours to obtain aerogel, where the mass ratio of graphene oxide in the graphene oxide dispersion, shell, zinc chloride and glucose is 2:5-10:0.5-1:0.5-1, (iv) placing the aerogel in a tube furnace, preheating up to 150-200 degrees C in a nitrogen environment for 2-3 hours, then increasing the temperature to 450-550 degrees C, heat-preserving for 7-10 hours, cooling the furnace temperature to 90-100 degrees C, then taking out the product and naturally cooling.